Annual report pursuant to Section 13 and 15(d)

PENSIONS AND OTHER POSTRETIREMENT BENEFITS - Fair Value of Plan Assets (Details)

v3.24.0.1
PENSIONS AND OTHER POSTRETIREMENT BENEFITS - Fair Value of Plan Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category $ 4,282 $ 4,338 $ 5,606
OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 739 728 812
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 1,920 1,553  
Quoted Prices in Active Markets for Identical Assets (Level 1) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 441 324  
Significant  Other Observable Inputs (Level 2) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 657 678  
Significant  Other Observable Inputs (Level 2) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 121 196  
Significant Unobservable Inputs (Level 3) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 770 912 $ 904
Significant Unobservable Inputs (Level 3) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 27 35  
Investments Measured at Net Asset Value | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 935 1,195  
Investments Measured at Net Asset Value | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 150 173  
U.S. equities | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 809 1,133  
U.S. equities | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 102 113  
U.S. equities | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 809 564  
U.S. equities | Quoted Prices in Active Markets for Identical Assets (Level 1) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 102 24  
U.S. equities | Significant  Other Observable Inputs (Level 2) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
U.S. equities | Significant  Other Observable Inputs (Level 2) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
U.S. equities | Significant Unobservable Inputs (Level 3) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
U.S. equities | Significant Unobservable Inputs (Level 3) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
U.S. equities | Investments Measured at Net Asset Value | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 569  
U.S. equities | Investments Measured at Net Asset Value | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 89  
Global equities | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 567 434  
Global equities | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 33 47  
Global equities | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 502 328  
Global equities | Quoted Prices in Active Markets for Identical Assets (Level 1) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 3 5  
Global equities | Significant  Other Observable Inputs (Level 2) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Global equities | Significant  Other Observable Inputs (Level 2) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Global equities | Significant Unobservable Inputs (Level 3) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Global equities | Significant Unobservable Inputs (Level 3) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Global equities | Investments Measured at Net Asset Value | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 65 106  
Global equities | Investments Measured at Net Asset Value | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 30 42  
U.S. government securities | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 821 530  
U.S. government securities | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 193 228  
U.S. government securities | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 22 87  
U.S. government securities | Quoted Prices in Active Markets for Identical Assets (Level 1) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 119 149  
U.S. government securities | Significant  Other Observable Inputs (Level 2) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 657 380  
U.S. government securities | Significant  Other Observable Inputs (Level 2) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 27 79  
U.S. government securities | Significant Unobservable Inputs (Level 3) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
U.S. government securities | Significant Unobservable Inputs (Level 3) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
U.S. government securities | Investments Measured at Net Asset Value | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 142 63  
U.S. government securities | Investments Measured at Net Asset Value | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 47 0  
U.S. corporate bonds | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 681 1,213  
U.S. corporate bonds | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 357 263  
U.S. corporate bonds | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 587 574  
U.S. corporate bonds | Quoted Prices in Active Markets for Identical Assets (Level 1) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 214 146  
U.S. corporate bonds | Significant  Other Observable Inputs (Level 2) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 266  
U.S. corporate bonds | Significant  Other Observable Inputs (Level 2) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 94 117  
U.S. corporate bonds | Significant Unobservable Inputs (Level 3) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
U.S. corporate bonds | Significant Unobservable Inputs (Level 3) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
U.S. corporate bonds | Investments Measured at Net Asset Value | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 94 373  
U.S. corporate bonds | Investments Measured at Net Asset Value | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 49 0  
Non U.S. and other bonds | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 160 32  
Non U.S. and other bonds | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Non U.S. and other bonds | Significant  Other Observable Inputs (Level 2) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 32  
Non U.S. and other bonds | Significant Unobservable Inputs (Level 3) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Non U.S. and other bonds | Investments Measured at Net Asset Value | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 160 0  
Hedge funds | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 403 115  
Hedge funds | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 10 14  
Hedge funds | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Hedge funds | Quoted Prices in Active Markets for Identical Assets (Level 1) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Hedge funds | Significant  Other Observable Inputs (Level 2) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Hedge funds | Significant  Other Observable Inputs (Level 2) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Hedge funds | Significant Unobservable Inputs (Level 3) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 118 115  
Hedge funds | Significant Unobservable Inputs (Level 3) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 10 14  
Hedge funds | Investments Measured at Net Asset Value | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 285 0  
Hedge funds | Investments Measured at Net Asset Value | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Private equity | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 146 143  
Private equity | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Private equity | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Private equity | Quoted Prices in Active Markets for Identical Assets (Level 1) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Private equity | Significant  Other Observable Inputs (Level 2) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Private equity | Significant  Other Observable Inputs (Level 2) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Private equity | Significant Unobservable Inputs (Level 3) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 146 143  
Private equity | Significant Unobservable Inputs (Level 3) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Private equity | Investments Measured at Net Asset Value | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Private equity | Investments Measured at Net Asset Value | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Structured credit | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 220 298  
Structured credit | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 7 9  
Structured credit | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Structured credit | Quoted Prices in Active Markets for Identical Assets (Level 1) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Structured credit | Significant  Other Observable Inputs (Level 2) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Structured credit | Significant  Other Observable Inputs (Level 2) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Structured credit | Significant Unobservable Inputs (Level 3) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 220 298  
Structured credit | Significant Unobservable Inputs (Level 3) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 7 9  
Structured credit | Investments Measured at Net Asset Value | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Structured credit | Investments Measured at Net Asset Value | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Real estate | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 475 356  
Real estate | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 34 12  
Real estate | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Real estate | Quoted Prices in Active Markets for Identical Assets (Level 1) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Real estate | Significant  Other Observable Inputs (Level 2) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Real estate | Significant  Other Observable Inputs (Level 2) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Real estate | Significant Unobservable Inputs (Level 3) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 286 356  
Real estate | Significant Unobservable Inputs (Level 3) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 10 12  
Real estate | Investments Measured at Net Asset Value | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 189 0  
Real estate | Investments Measured at Net Asset Value | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 24 0  
Absolute return fixed income | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 84  
Absolute return fixed income | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 42  
Absolute return fixed income | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Absolute return fixed income | Quoted Prices in Active Markets for Identical Assets (Level 1) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Absolute return fixed income | Significant  Other Observable Inputs (Level 2) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Absolute return fixed income | Significant  Other Observable Inputs (Level 2) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Absolute return fixed income | Significant Unobservable Inputs (Level 3) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Absolute return fixed income | Significant Unobservable Inputs (Level 3) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Absolute return fixed income | Investments Measured at Net Asset Value | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 84  
Absolute return fixed income | Investments Measured at Net Asset Value | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 42  
Debt Security, Corporate, Non-US | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 3 0  
Debt Security, Corporate, Non-US | Quoted Prices in Active Markets for Identical Assets (Level 1) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 3 0  
Debt Security, Corporate, Non-US | Significant  Other Observable Inputs (Level 2) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Debt Security, Corporate, Non-US | Significant Unobservable Inputs (Level 3) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Debt Security, Corporate, Non-US | Investments Measured at Net Asset Value | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category $ 0 $ 0