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

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

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Amount, after tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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Amount, before tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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