Annual report pursuant to Section 13 and 15(d)

PENSIONS AND POSTRETIREMENT BENEFITS - Fair Value Measurements Using Significant Unobservable Inputs (Level 3) on Changes in Plan Assets (Details)

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PENSIONS AND POSTRETIREMENT BENEFITS - Fair Value Measurements Using Significant Unobservable Inputs (Level 3) on Changes in Plan Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Pension Benefits    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Fair value of plan assets — beginning of year $ 5,606 $ 5,332
Actual return on plan assets:    
Fair value of plan assets — end of year 4,338 5,606
Pension Benefits | Private equity    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Fair value of plan assets — beginning of year 151  
Actual return on plan assets:    
Fair value of plan assets — end of year 143 151
Reserve for investment commitments 117  
OPEB    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Fair value of plan assets — beginning of year 812 783
Actual return on plan assets:    
Fair value of plan assets — end of year 728 812
OPEB | Private equity    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Fair value of plan assets — beginning of year 0  
Actual return on plan assets:    
Fair value of plan assets — end of year 0 0
Significant Unobservable Inputs (Level 3) | Pension Benefits    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Fair value of plan assets — beginning of year 904 670
Actual return on plan assets:    
Relating to assets still held at the reporting date (6) 124
Relating to assets sold during the period 15 8
Purchases 28 142
Sales (29) (40)
Acquired through business combinations 0  
Fair value of plan assets — end of year 912 904
Significant Unobservable Inputs (Level 3) | Pension Benefits | Private equity    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Fair value of plan assets — beginning of year 151  
Actual return on plan assets:    
Fair value of plan assets — end of year 143 151
Significant Unobservable Inputs (Level 3) | OPEB    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Fair value of plan assets — beginning of year 42  
Actual return on plan assets:    
Fair value of plan assets — end of year 35 42
Significant Unobservable Inputs (Level 3) | OPEB | Private equity    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Fair value of plan assets — beginning of year 0  
Actual return on plan assets:    
Fair value of plan assets — end of year 0 0
Significant Unobservable Inputs (Level 3) | OPEB | VEBA Assets    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Fair value of plan assets — beginning of year 42 38
Actual return on plan assets:    
Relating to assets still held at the reporting date 1 6
Relating to assets sold during the period 1 0
Purchases 0 0
Sales (9) (2)
Fair value of plan assets — end of year $ 35 $ 42