Revenues and Segment Information, Activity (Details) $ in Millions		3 Months Ended
		Mar. 31, 2026 USD ($) segment	Mar. 31, 2025 USD ($)	Dec. 31, 2025 USD ($)
Segment Information for our Reportable Segments
Revenues	[1]	$ 32,381	$ 30,258
Cost of sales:
Cost of materials and other		26,185	26,048
Taxes other than income taxes		1,721	1,500
Operating expenses (excluding depreciation and amortization expense reflected below)		1,595	1,523
Depreciation and amortization expense		828	680
Total cost of sales		30,329	29,751
Asset impairment loss		0	1,131
Other operating expenses		24	4
Operating income (loss)		1,731	(900)
Other income, net		132	120
Interest and debt expense, net of capitalized interest		140	137
Income (loss) before income tax expense (benefit)		1,723	(917)
Segment assets		62,142		$ 57,988
Expenditures for long-lived assets		$ 448	659
Segment Information (Textual)
Number of reportable segments | segment		3
Intersegment Eliminations [Member]
Segment Information for our Reportable Segments
Revenues		$ (1,007)	(626)
Cost of sales:
Operating income (loss)		(7)	23
Segment assets		(374)		(266)
Operating Segments [Member]
Segment Information for our Reportable Segments
Revenues		33,388	30,884
Cost of sales:
Operating income (loss)		2,035	(651)
Segment assets		54,709	52,659	51,316
Expenditures for long-lived assets		442	636
Corporate [Member]
Cost of sales:
Other corporate expenses		(297)	(272)
Other income, net		132	120
Interest and debt expense, net of capitalized interest		(140)	(137)
Segment assets		7,807		6,938
Expenditures for long-lived assets		6	23
Refining [Member]
Segment Information for our Reportable Segments
Revenues		30,805	28,757
Segment Information (Textual)
Investments in nonconsolidated joint ventures		680		$ 684
Refining [Member] | Intersegment Eliminations [Member]
Segment Information for our Reportable Segments
Revenues		(2)	(2)
Refining [Member] | Operating Segments [Member]
Segment Information for our Reportable Segments
Revenues		30,807	28,759
Cost of sales:
Cost of materials and other		25,178	24,769
Taxes other than income taxes		1,721	1,500
Operating expenses (excluding depreciation and amortization expense reflected below)		1,346	1,291
Depreciation and amortization expense		732	594
Total cost of sales		28,977	28,154
Asset impairment loss			1,131
Other operating expenses		24	4
Operating income (loss)		1,806	(530)
Segment assets		47,506	45,755
Expenditures for long-lived assets		402	533
Renewable Diesel [Member]
Segment Information for our Reportable Segments
Revenues		711	493
Renewable Diesel [Member] | Intersegment Eliminations [Member]
Segment Information for our Reportable Segments
Revenues		(703)	(407)
Renewable Diesel [Member] | Operating Segments [Member]
Segment Information for our Reportable Segments
Revenues		1,414	900
Cost of sales:
Cost of materials and other		1,112	895
Taxes other than income taxes		0	0
Operating expenses (excluding depreciation and amortization expense reflected below)		85	78
Depreciation and amortization expense		78	68
Total cost of sales		1,275	1,041
Asset impairment loss			0
Other operating expenses		0	0
Operating income (loss)		139	(141)
Segment assets		5,634	5,283
Expenditures for long-lived assets		33	95
Segment Information (Textual)
Clean fuel production credit		178	51
Ethanol [Member]
Segment Information for our Reportable Segments
Revenues		865	1,008
Ethanol [Member] | Intersegment Eliminations [Member]
Segment Information for our Reportable Segments
Revenues		(302)	(217)
Ethanol [Member] | Operating Segments [Member]
Segment Information for our Reportable Segments
Revenues		1,167	1,225
Cost of sales:
Cost of materials and other		894	1,032
Taxes other than income taxes		0	0
Operating expenses (excluding depreciation and amortization expense reflected below)		164	154
Depreciation and amortization expense		19	19
Total cost of sales		1,077	1,205
Asset impairment loss			0
Other operating expenses		0	0
Operating income (loss)		90	20
Segment assets		1,569	1,621
Expenditures for long-lived assets		7	$ 8
Segment Information (Textual)
Clean fuel production credit		$ 20

[1] Includes excise taxes on sales by certain of our foreign operations of $1,725 million and $1,504 million for the three months ended March 31, 2026 and 2025, respectively.