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

Loss Contingency Accrual, Net Of Recoveries

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Loss Contingency Accrual, Payments, Net Of Recoveries

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Loss Contingency Accrual, Provision, Net Of Recoveries

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Amount of loss contingency liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-1

Reference 2: http://www.xbrl.org/2003/role/recommendedDisclosureRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-10

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Amount of cash outflow reducing loss contingency liability.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-1

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

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482425/460-10-50-3

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 17
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-17

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Amount of additions to receivables pertaining to a loss contingency.

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