Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Mar. 31, 2025	Sep. 30, 2025	Sep. 30, 2024
Decrease in current assets:
Receivables, net		$ 619	$ 1,382
Inventories		529	574
Prepaid expenses and other		51	265
Increase (decrease) in current liabilities:
Accounts payable		(1,438)	(1,081)
Accrued expenses		264	(93)
Taxes other than income taxes payable		13	(114)
Income taxes payable		119	(138)
Changes in current assets and current liabilities		157	795
Cash flows related to interest and income taxes
Interest paid in excess of amount capitalized, including interest on finance leases		362	374
Income taxes paid, net		398	835
Operating cash flows
Operating Leases		394	392
Finance Leases		84	87
Financing cash flows
Finance Leases		196	173
Changes in lease balances resulting from new and modified leases, operating leases		357	346
Changes in lease balances resulting from new and modified leases, finance leases		22	312
Supplemental Cash Flow Information (Textual)
Increase in noncontrolling interest, conversion of IEnova Revolver debt to equity			457
Variable Interest Entity, Primary Beneficiary [Member] \| IEnova Revolver [Member] \| Line of Credit [Member] \| Central Mexico Terminals [Member]
Supplemental Cash Flow Information (Textual)
Debt conversion, debt amount converted			$ 457
Operating Segments [Member] \| Refining [Member]
Supplemental Cash Flow Information (Textual)
Asset retirement obligation, liabilities incurred	$ 337	337
Blender's Tax Credit Receivable [Member]
Supplemental Cash Flow Information (Textual)
Collection of blender's tax credit receivable		$ 246

Amount of asset retirement obligations incurred during the period.

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