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Commitments and Contingencies - Schedule of Environmental Matters and Legal Proceedings (Details) - Eastern Ohio Incident - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024
Loss Contingency Accrual [Roll Forward]
Loss contingency accrual, beginning balance	$ 721	$ 663	$ 688	$ 977	$ 1,037	$ 464
Loss contingency receivable, beginning balance	(49)	(120)	(18)	(119)	(98)	0
Loss contingency accrual net of recoveries, beginning balance	672	543	670	858	939	464
Loss contingency recognized	5	107	39	129	91	700
Loss contingency accrual payments	(23)	(49)	(64)	(83)	(151)	(127)
Loss contingency, receivable, additions	(16)	(154)	(224)	(288)	(156)	(108)
Loss contingency, receivable, proceeds	16	225	122	184	135	10
Loss contingency accrual provision net of recoveries	(11)	(47)	(185)	(159)	(65)	592
Loss contingency accrual payments net of recoveries	(7)	176	58	101	(16)	(117)
Loss contingency accrual, ending balance	703	721	663	1,023	977	1,037
Loss contingency receivable, ending balance	(49)	(49)	(120)	(223)	(119)	(98)
Loss contingency accrual net of recoveries, ending balance	654	672	543	800	858	939
Environmental
Loss Contingency Accrual [Roll Forward]
Loss contingency accrual, beginning balance	209	227	244	265	292	319
Loss contingency recognized	0	0	0	51	53	60
Loss contingency accrual payments	(12)	(18)	(17)	(52)	(80)	(87)
Loss contingency accrual, ending balance	197	209	227	264	265	292
Legal Contingencies And Other
Loss Contingency Accrual [Roll Forward]
Loss contingency accrual, beginning balance	512	436	444	712	745	145
Loss contingency recognized	5	107	39	78	38	640
Loss contingency accrual payments	(11)	(31)	(47)	(31)	(71)	(40)
Loss contingency accrual, ending balance	$ 506	$ 512	$ 436	$ 759	$ 712	$ 745

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Loss Contingency Accrual, Net Of Recoveries

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Amount of loss contingency liability.

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Amount of cash outflow reducing loss contingency liability.

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Amount charged against operating income increasing loss contingency liability, after adjustments to reduce previously estimated charges.

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Amount of receivable related to a loss contingency accrual. For example, an insurance recovery receivable.

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Amount of cash inflow from the collection of receivables related to a loss contingency.

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