Annual report [Section 13 and 15(d), not S-K Item 405]

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

v3.25.0.1
PENSIONS AND OTHER POSTRETIREMENT BENEFITS - Fair Value of Plan Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category $ 4,237 $ 4,282 $ 4,338
OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 742 739 728
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 1,941 1,920  
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 450 441  
Significant  Other Observable Inputs (Level 2) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 577 657  
Significant  Other Observable Inputs (Level 2) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 124 121  
Significant Unobservable Inputs (Level 3) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 692 770 $ 912
Significant Unobservable Inputs (Level 3) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 19 27  
Investments Measured at Net Asset Value | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 1,027 935  
Investments Measured at Net Asset Value | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 149 150  
U.S. equities | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 816 809  
U.S. equities | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 99 102  
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 816 809  
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 99 102  
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 0  
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 0  
Global equities | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 570 567  
Global equities | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 31 33  
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 501 502  
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 3  
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 69 65  
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 28 30  
U.S. government securities | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 755 821  
U.S. government securities | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 224 193  
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 32 22  
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 130 119  
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 577 657  
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 50 27  
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 146 142  
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 44 47  
U.S. corporate bonds | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 698 681  
U.S. corporate bonds | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 342 357  
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 583 587  
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 216 214  
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 0  
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 74 94  
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 115 94  
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 52 49  
Non U.S. and other bonds | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 194 160  
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 9 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 0  
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 185 160  
Hedge funds | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 408 403  
Hedge funds | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 10 10  
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 128 118  
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 10  
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 280 285  
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 151 146  
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 | 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 Unobservable Inputs (Level 3) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 151 146  
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  
Structured credit | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 171 220  
Structured credit | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 4 7  
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 171 220  
Structured credit | Significant Unobservable Inputs (Level 3) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 4 7  
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  
Debt Security, Corporate, Non-US | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 2 3  
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 2 3  
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  
Real estate | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 474 475  
Real estate | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 30 34  
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 242 286  
Real estate | Significant Unobservable Inputs (Level 3) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 5 10  
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 232 189  
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 $ 25 $ 24