Segment Information (Recon of Other Significant Items from Segments to Consolidated) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting, Other Significant Reconciling Item [Line Items]
Investments in equity method investments		$ 509	$ 480	$ 405
Segment, Reconciliation of Other Items from Segments to Consolidated [Abstract]
Total capital expenditures	[1]	2,567	2,074	2,383
Operating Segments
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital Expenditures And Investments		2,957	2,416	2,577
Investments in equity method investments		509	480	405
Operating Segments | Refining & Marketing
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital Expenditures And Investments		1,445	998	1,275
Operating Segments | Midstream
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital Expenditures And Investments		1,504	1,105	1,069
Operating Segments | Renewable Diesel
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital Expenditures And Investments		8	313	233
Corporate
Segment, Reconciliation of Other Items from Segments to Consolidated [Abstract]
Capital Expenditures Excluding Capitalized Interest		63	83	108
Capitalized interest		$ 56	$ 55	$ 103

[1] Includes changes in capital expenditure accruals. See Note 21 for a reconciliation of total capital expenditures to additions to property, plant and equipment as reported in the consolidated statements of cash flows