Accumulated Other Comprehensive Income (Loss), Net of Tax - Schedule of Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	$ (2)	$ 1	$ (8)	$ (3)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax	2	0	3	1
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	0	1	(5)	(2)
Cash Flow Hedges [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Cash Flow Hedge, Pre-tax	1	4	3	11
Cash Flow Hedge, Tax	0	(1)	(1)	(3)
Cash Flow Hedge, After Tax	1	3	2	8
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax			3		$ 13
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	1	3	2	8	$ 9
Pension and OPEB Plans [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification Adjustment from AOCI, Pension and OPEB, Pre-Tax	(2)	(3)	(6)	(8)
Reclassification Adjustment from AOCI, Pension and OPEB, Tax	1	1	2	2
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax	(1)	(2)	(4)	(6)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(1)	(2)	(4)	(6)
Available-for-Sale Securities [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification for Available for Sale Securities, Pre-Tax	(1)	0	(5)	(6)
Reclassification for Available for Sale Securities, Tax	1	0	2	2
Reclassification for Available for Sale Securities, After-Tax	0	0	(3)	(4)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(0)	(0)	(3)	(4)
Interest Expense [Member] \| Cash Flow Hedges [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Cash Flow Hedge, Pre-tax	1	4	3	11
Cash Flow Hedge, Tax	0	(1)	(1)	(3)
Cash Flow Hedge, After Tax	1	3	2	8
Non-Operating Pension and OPEB Credits (Costs) [Member] \| Pension and OPEB Plans [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Amortization of Prior Service (Cost) Credit, Pre-Tax		(1)		(1)
Amortization of Prior Service (Cost) Credit, Tax		0		0
Amortization of Prior Service (Cost) Credit, After-Tax		(1)		(1)
Amortization of Net Actuarial Loss, Pre-Tax	2	2	6	7
Amortization of Net Actuarial Loss, Tax	1	1	2	2
Amortization of Net Actuarial Loss, After-Tax	(1)	(1)	(4)	(5)
Net Gains (Losses) on Trust Investments [Member] \| Available-for-Sale Securities [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification for Available for Sale Securities, Pre-Tax	(1)	0	(5)	(6)
Reclassification for Available for Sale Securities, Tax	1	0	2	2
Reclassification for Available for Sale Securities, After-Tax	$ 0	$ 0	$ (3)	$ (4)

[Line Items] for Reclassification out of Accumulated Other Comprehensive Income [Table]

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