Revenues and Segment Information, Components of Operating Income (Loss) (Details) $ in Millions		1 Months Ended	3 Months Ended		6 Months Ended
		Mar. 31, 2025 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) segment		Jun. 30, 2024 USD ($)
Segment Information for our Reportable Segments
Revenues	[1]		$ 29,889	$ 34,490	$ 60,147		$ 66,249
Cost of sales:
Cost of materials and other	[2]		26,332	30,943	53,880		58,625
Operating expenses (excluding depreciation and amortization expense reflected below)			1,522	1,424	3,045		2,835
Depreciation and amortization expense			786	684	1,466		1,367
Total cost of sales			28,640	33,051	58,391		62,827
Asset impairment loss			0	0	1,131	[3]	0
Other operating expenses			4	3	8		37
General and administrative expenses (excluding depreciation and amortization expense reflected below)			220	203	481		461
Depreciation and amortization expense			28	12	39		24
Operating income			997	1,221	97		2,900
Other income, net			86	122	206		266
Interest and debt expense, net of capitalized interest			(141)	(140)	(278)		(280)
Income before income tax expense			942	1,203	25		2,886
Total expenditures for long-lived assets	[4]		407	420	$ 1,066		1,081
Segment Information (Textual)
Number of reportable segments | segment					3
Corporate, Reconciling Items, and Eliminations [Member]
Segment Information for our Reportable Segments
Revenues			(740)	(862)	$ (1,366)		(1,763)
Cost of sales:
Operating income			(244)	(220)	(493)		(486)
Corporate [Member]
Segment Information for our Reportable Segments
Revenues			0	0	0		0
Cost of sales:
Asset impairment loss					0
General and administrative expenses (excluding depreciation and amortization expense reflected below)			220	203	481		461
Depreciation and amortization expense			28	12	39		24
Total expenditures for long-lived assets	[4]		9	8	32		24
Intersegment Eliminations [Member]
Segment Information for our Reportable Segments
Revenues			(740)	(862)	(1,366)		(1,763)
Cost of sales:
Cost of materials and other	[2]		(742)	(856)	(1,390)		(1,760)
Operating expenses (excluding depreciation and amortization expense reflected below)			(1)	0	(1)		0
Depreciation and amortization expense			(1)	(1)	(2)		(2)
Total cost of sales			(744)	(857)	(1,393)		(1,762)
Other operating expenses			0	0	0		0
Refining [Member]
Segment Information for our Reportable Segments
Revenues			28,324	33,044	57,081		63,187
Refining [Member] | Operating Segments [Member]
Segment Information for our Reportable Segments
Revenues			28,326	33,047	57,085		63,192
Cost of sales:
Cost of materials and other	[2]		25,042	29,995	51,311		56,606
Operating expenses (excluding depreciation and amortization expense reflected below)			1,307	1,219	2,598		2,403
Depreciation and amortization expense			707	604	1,301		1,204
Total cost of sales			27,056	31,818	55,210		60,213
Asset impairment loss		$ 1,100			1,131
Other operating expenses			4	5	8		10
General and administrative expenses (excluding depreciation and amortization expense reflected below)			0	0	0		0
Depreciation and amortization expense			0	0	0		0
Operating income			1,266	1,224	736		2,969
Total expenditures for long-lived assets	[4]		374	286	907		847
Refining [Member] | Intersegment Eliminations [Member]
Segment Information for our Reportable Segments
Revenues			2	3	4		5
Renewable Diesel [Member]
Segment Information for our Reportable Segments
Revenues			565	554	1,058		1,256
Renewable Diesel [Member] | Operating Segments [Member]
Segment Information for our Reportable Segments
Revenues			1,098	1,184	1,998		2,595
Cost of sales:
Cost of materials and other	[2]		1,044	930	1,939		1,996
Operating expenses (excluding depreciation and amortization expense reflected below)			72	80	150		170
Depreciation and amortization expense			61	62	129		127
Total cost of sales			1,177	1,072	2,218		2,293
Asset impairment loss					0
Other operating expenses			0	0	0		0
General and administrative expenses (excluding depreciation and amortization expense reflected below)			0	0	0		0
Depreciation and amortization expense			0	0	0		0
Operating income			(79)	112	(220)		302
Total expenditures for long-lived assets	[4]		14	115	109		193
Segment Information (Textual)
Clean fuel production credit			140		191
Blender's tax credit				308			639
Renewable Diesel [Member] | Intersegment Eliminations [Member]
Segment Information for our Reportable Segments
Revenues			533	630	940		1,339
Ethanol [Member]
Segment Information for our Reportable Segments
Revenues			1,000	892	2,008		1,806
Ethanol [Member] | Operating Segments [Member]
Segment Information for our Reportable Segments
Revenues			1,205	1,121	2,430		2,225
Cost of sales:
Cost of materials and other	[2]		988	874	2,020		1,783
Operating expenses (excluding depreciation and amortization expense reflected below)			144	125	298		262
Depreciation and amortization expense			19	19	38		38
Total cost of sales			1,151	1,018	2,356		2,083
Asset impairment loss					0
Other operating expenses			0	(2)	0		27
General and administrative expenses (excluding depreciation and amortization expense reflected below)			0	0	0		0
Depreciation and amortization expense			0	0	0		0
Operating income			54	105	74		115
Total expenditures for long-lived assets	[4]		10	11	18		17
Ethanol [Member] | Intersegment Eliminations [Member]
Segment Information for our Reportable Segments
Revenues			$ 205	$ 229	$ 422		$ 419

[1] Includes excise taxes on sales by certain of our foreign operations of $1,662 million and $1,456 million for the three months ended June 30, 2025 and 2024, respectively, and $3,166 million and $2,843 million for the six months ended June 30, 2025 and 2024, respectively.

[2] Cost of materials and other for our Renewable Diesel segment is net of the clean fuel production credit on qualifying sales of certain low-carbon transportation fuels of $140 million and $191 million for the three and six months ended June 30, 2025, respectively, and the blender’s tax credit on qualified fuel mixtures of $308 million and $639 million for the three and six months ended June 30, 2024, respectively.

[3] The asset impairment loss was recognized in our Refining segment in March 2025.

[4] Total expenditures for long-lived assets includes amounts related to capital expenditures and deferred turnaround and catalyst costs.