Pension lift out settlement charge.

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Pension lift out settlement charge, net of tax.

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Pension settlement charge, tax.

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

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Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax

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Amount, before tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan.

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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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Amount before tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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Amount after tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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Amount, before tax, of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan.

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Accumulated Other Comprehensive Income (Loss), Net of Tax - Schedule of Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Pension Lift Out Settlement Charge	$ (6)	$ (332)
Pension Lift Out Settlement Charge, net of tax	$ (4)	$ (239)		$ (239)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax			$ (5)	(307)	$ (49)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax			2	82	19
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)			(3)	(225)	(30)
Cash Flow Hedges [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Cash Flow Hedge, Pre-tax			13	5	(5)
Cash Flow Hedge, Tax			(4)	(2)	2
Cash Flow Hedge, After Tax			9	3	(3)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax			13	5
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)			9	3	(3)
Pension and OPEB Plans [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification Adjustment from AOCI, Pension and OPEB, Pre-Tax			(10)	(346)	(1)
Reclassification Adjustment from AOCI, Pension and OPEB, Tax			3	98	0
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax			(7)	(248)	(1)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)			(7)	(248)	(1)
Available-for-Sale Securities [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification for Available for Sale Securities, Pre-Tax			(8)	34	(43)
Reclassification for Available for Sale Securities, Tax			3	(14)	17
Reclassification for Available for Sale Securities, After-Tax			(5)	20	(26)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)			(5)	20	(26)
Interest Expense [Member] \| Cash Flow Hedges [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Cash Flow Hedge, Pre-tax			13	5	(5)
Cash Flow Hedge, Tax			(4)	(2)	2
Cash Flow Hedge, After Tax			9	3	(3)
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			0	8	21
Amortization of Prior Service (Cost) Credit, Tax			0	(2)	(6)
Amortization of Prior Service (Cost) Credit, After-Tax			0	6	15
Amortization of Actuarial Loss, Pre-Tax				(20)	(22)
Amortization of Actuarial Loss, Tax				6	6
Amortization of Actuarial Loss, After-Tax				(14)	(16)
Pension Lift Out Settlement Charge				(334)
Pension Settlement Charge, tax				94
Pension Lift Out Settlement Charge, net of tax				(240)
Reclassification Adjustment from AOCI, Pension and OPEB, Pre-Tax			(10)
Reclassification Adjustment from AOCI, Pension and OPEB, Tax			3
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax			(7)
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			(8)	34	(43)
Reclassification for Available for Sale Securities, Tax			3	(14)	17
Reclassification for Available for Sale Securities, After-Tax			$ (5)	$ 20	$ (26)