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Segment Information (Capital Expenditures) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Plus:
Capital expenditures	[1]	$ 679	$ 456	$ 1,705	$ 1,412
Operating Segments
Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items]
Capital expenditures and investments		929	489	2,092	1,667
Less investments in equity method investees		271	66	450	362
Operating Segments | Refining & Marketing
Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items]
Capital expenditures and investments		372	255	967	919
Operating Segments | Midstream
Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items]
Capital expenditures and investments		557	234	1,125	748
Corporate
Plus:
Corporate		7	24	25	64
Capitalized interest		$ 14	$ 9	$ 38	$ 43
[1] Includes changes in capital expenditure accruals. See Note 19 for a reconciliation of total capital expenditures to additions to property, plant and equipment for the nine months ended September 30, 2024 and 2023 as reported in the consolidated statements of cash flows.

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