Revenues and Segment Information, Activity (Details) $ in Millions		1 Months Ended	12 Months Ended
		Mar. 31, 2025 USD ($)	Dec. 31, 2025 USD ($) segment	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Segment Information for our Reportable Segments
Revenues	[1]		$ 122,687	$ 129,881	$ 144,766
Cost of sales:
Cost of materials and other			101,096	110,616	117,367
Taxes other than income taxes			6,720	5,900	5,720
Operating expenses (excluding depreciation and amortization expense reflected below)			6,344	5,831	6,089
Depreciation and amortization expense			3,095	2,729	2,658
Total cost of sales			117,255	125,076	131,834
Asset impairment loss			1,131	0	0
Other operating expenses			15	44	33
Operating income			3,181	3,755	11,858
Other income, net			380	499	502
Interest and debt expense, net of capitalized interest			556	556	592
Income before income tax expense			3,005	3,698	11,768
Segment assets			57,988	60,143
Expenditures for long-lived assets			$ 1,885	2,057	1,916
Segment Information (Textual)
Number of reportable segments | segment			3
Investments in nonconsolidated joint ventures			$ 684	695
Intersegment Eliminations [Member]
Segment Information for our Reportable Segments
Revenues			(3,053)	(3,534)	(4,272)
Cost of sales:
Operating income			28	(5)	(17)
Segment assets			(266)	(376)
Operating Segments [Member]
Segment Information for our Reportable Segments
Revenues			125,740	133,415	149,038
Cost of sales:
Operating income			4,258	4,766	12,916
Segment assets			51,316	53,954	56,370
Expenditures for long-lived assets			1,815	1,990	1,825
Corporate [Member]
Cost of sales:
Other corporate expenses			(1,105)	(1,006)	(1,041)
Other income, net			380	499	502
Interest and debt expense, net of capitalized interest			(556)	(556)	(592)
Segment assets			6,938	6,565
Expenditures for long-lived assets			70	67	91
Refining [Member]
Segment Information for our Reportable Segments
Revenues			116,158	123,853	136,470
Segment Information (Textual)
Investments in nonconsolidated joint ventures			684	695
Refining [Member] | Intersegment Eliminations [Member]
Segment Information for our Reportable Segments
Revenues			(8)	(10)	(18)
Refining [Member] | Operating Segments [Member]
Segment Information for our Reportable Segments
Revenues			116,166	123,863	136,488
Cost of sales:
Cost of materials and other			96,080	106,638	111,681
Taxes other than income taxes			6,720	5,900	5,720
Operating expenses (excluding depreciation and amortization expense reflected below)			5,426	4,946	5,208
Depreciation and amortization expense			2,754	2,391	2,351
Total cost of sales			110,980	119,875	124,960
Asset impairment loss		$ 1,100	1,131
Other operating expenses			15	17	17
Operating income			4,040	3,971	11,511
Segment assets			44,498	46,729	49,031
Expenditures for long-lived assets			1,606	1,635	1,488
Renewable Diesel [Member]
Segment Information for our Reportable Segments
Revenues			2,508	2,410	3,823
Renewable Diesel [Member] | Intersegment Eliminations [Member]
Segment Information for our Reportable Segments
Revenues			(2,089)	(2,656)	(3,168)
Renewable Diesel [Member] | Operating Segments [Member]
Segment Information for our Reportable Segments
Revenues			4,597	5,066	6,991
Cost of sales:
Cost of materials and other			4,178	3,944	5,550
Taxes other than income taxes			0	0	0
Operating expenses (excluding depreciation and amortization expense reflected below)			308	350	358
Depreciation and amortization expense			267	265	231
Total cost of sales			4,753	4,559	6,139
Asset impairment loss			0
Other operating expenses			0	0	0
Operating income			(156)	507	852
Segment assets			5,317	5,680	5,790
Expenditures for long-lived assets			170	321	294
Segment Information (Textual)
Clean fuel production credit			607
Blender's tax credit				1,300	1,200
Ethanol [Member]
Segment Information for our Reportable Segments
Revenues			4,021	3,618	4,473
Ethanol [Member] | Intersegment Eliminations [Member]
Segment Information for our Reportable Segments
Revenues			(956)	(868)	(1,086)
Ethanol [Member] | Operating Segments [Member]
Segment Information for our Reportable Segments
Revenues			4,977	4,486	5,559
Cost of sales:
Cost of materials and other			3,913	3,558	4,395
Taxes other than income taxes			0	0	0
Operating expenses (excluding depreciation and amortization expense reflected below)			611	536	515
Depreciation and amortization expense			79	77	80
Total cost of sales			4,603	4,171	4,990
Asset impairment loss			0
Other operating expenses			0	27	16
Operating income			374	288	553
Segment assets			1,501	1,545	1,549
Expenditures for long-lived assets			$ 39	$ 34	$ 43

[1] Includes excise taxes on sales by certain of our foreign operations of $6,748 million, $5,907 million, and $5,765 million for the years ended December 31, 2025, 2024, and 2023.