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Accumulated Other Comprehensive Loss - Reclassification out of Accumulated Other Comprehensive Loss (Details) - Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] - Reclassification out of Accumulated Other Comprehensive Income [Member] - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Amortization of net prior service cost $ 1 $ (1) $ (4)
Amortization of net loss (12) 19 57
Adjustment due to effects of regulation 11 (16) (42)
Other comprehensive (income) loss, defined benefit plan, reclassification adjustment from AOCI, before tax 0 2 11
Other comprehensive (income) loss, defined benefit plan, reclassification adjustment from AOCI, tax 0 0 (2)
Other comprehensive (income) loss, defined benefit plan, reclassification adjustment from AOCI, after tax $ 0 $ 2 $ 9