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Pension and Other Postretirement Employee Benefits (OPEB) Plans - Schedule of Pension and OPEB Costs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]      
Total benefit costs recognized as expense $ 14 $ 6 $ 14
Pension costs      
Defined Benefit Plan Disclosure [Line Items]      
Total benefit costs recognized as expense 9 2 6
OPEB costs      
Defined Benefit Plan Disclosure [Line Items]      
Total benefit costs recognized as expense $ 5 $ 4 $ 8