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Segment Information (Capital Expenditures) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Plus:
Capital expenditures	[1]	$ 709	$ 515	$ 1,353	$ 1,026
Operating Segments
Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items]
Capital expenditures and investments		1,039	545	1,788	1,163
Less investments in equity method investees		356	54	488	179
Operating Segments | Refining & Marketing
Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items]
Capital expenditures and investments		347	302	709	592
Operating Segments | Midstream
Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items]
Capital expenditures and investments		691	241	1,077	568
Operating Segments | Renewable Diesel
Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items]
Capital expenditures and investments		1	2	2	3
Corporate
Plus:
Corporate		6	12	15	18
Capitalized interest		$ 20	$ 12	$ 38	$ 24
[1] Includes changes in capital expenditure accruals. See Note 18 for a reconciliation of total capital expenditures to additions to property, plant and equipment for the six months ended June 30, 2025 and 2024 as reported in the consolidated statements of cash flows.

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