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	9 Months Ended	12 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Jun. 30, 2024	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Pension Lift Out Settlement Charge		$ (332)
Pension Lift Out Settlement Charge, net of tax		(239)			$ (239)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	$ 1	(338)		$ (3)	(365)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax	0	95		1	105
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	1	(243)		(2)	(260)
Cash Flow Hedges [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Cash Flow Hedge, Pre-tax	4	3		11	3
Cash Flow Hedge, Tax	(1)	(1)		(3)	(1)
Cash Flow Hedge, After Tax	3	2		8	2
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax				11		$ 5
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	3	2		8	2	$ 3
Pension and OPEB Plans [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification Adjustment from AOCI, Pension and OPEB, Pre-Tax		(333)			(343)
Reclassification Adjustment from AOCI, Pension and OPEB, Tax		93			96
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax		(240)			(247)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	3		$ 8
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(2)	(240)		(6)	(247)
Reclassification from AOCI, Current Period, Tax	1			2
Available-for-Sale Securities [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification for Available for Sale Securities, Pre-Tax	0	(8)		(6)	(25)
Reclassification for Available for Sale Securities, Tax	0	3		2	10
Reclassification for Available for Sale Securities, After-Tax	0	(5)		(4)	(15)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	0	(5)		(4)	(15)
Interest Expense [Member] \| Cash Flow Hedges [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Cash Flow Hedge, Pre-tax	4	3		11	3
Cash Flow Hedge, Tax	(1)	(1)		(3)	(1)
Cash Flow Hedge, After Tax	3	2		8	2
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)	2		(1)	6
Amortization of Prior Service (Cost) Credit, Tax	0	(1)		0	(2)
Amortization of Prior Service (Cost) Credit, After-Tax	(1)	1		(1)	4
Amortization of Actuarial Loss, Pre-Tax	(2)	(3)		(7)	(17)
Amortization of Actuarial Loss, Tax	1	1		2	5
Amortization of Actuarial Loss, After-Tax	(1)	(2)		(5)	(12)
Pension Lift Out Settlement Charge		(332)			(332)
Pension Settlement Charge, tax		93			93
Pension Lift Out Settlement Charge, net of tax		(239)			(239)
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	0	(8)		(6)	(25)
Reclassification for Available for Sale Securities, Tax	0	3		2	10
Reclassification for Available for Sale Securities, After-Tax	$ 0	$ (5)		$ (4)	$ (15)

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