Annual report pursuant to Section 13 and 15(d)

PENSIONS AND OTHER POSTRETIREMENT BENEFITS - Contributions (Details)

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PENSIONS AND OTHER POSTRETIREMENT BENEFITS - Contributions (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Pension Benefits    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Employer contributions $ 29 $ 6
Pension benefits, employer contributions and payments 29  
Expected employer contributions, next fiscal year 122  
OPEB    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Employer contributions 65 198
Employer contributions 65 198
Expected employer contributions, next fiscal year 66  
OPEB | VEBA    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Employer contributions 0 85
Expected employer contributions, next fiscal year 0  
OPEB | Direct Payments    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Employer contributions 65 $ 113
Expected employer contributions, next fiscal year $ 66