Revenues and Segment Information, Components of Operating Income (Loss) (Details) $ in Millions		1 Months Ended	3 Months Ended		9 Months Ended
		Mar. 31, 2025 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) segment		Sep. 30, 2024 USD ($)
Segment Information for our Reportable Segments
Revenues	[1]		$ 32,168	$ 32,876	$ 92,315		$ 99,125
Cost of sales:
Cost of materials and other	[2]		27,958	29,965	81,838		88,590
Operating expenses (excluding depreciation and amortization expense reflected below)			1,614	1,482	4,659		4,317
Depreciation and amortization expense			824	675	2,290		2,042
Total cost of sales			30,396	32,122	88,787		94,949
Asset impairment loss			0	0	1,131	[3]	0
Other operating expenses			5	3	13		40
General and administrative expenses (excluding depreciation and amortization expense reflected below)			246	234	727		695
Depreciation and amortization expense			12	10	51		34
Operating income			1,509	507	1,606		3,407
Other income, net			86	123	292		389
Interest and debt expense, net of capitalized interest			(139)	(141)	(417)		(421)
Income before income tax expense			1,456	489	1,481		3,375
Total expenditures for long-lived assets	[4]		409	429	$ 1,475		1,510
Segment Information (Textual)
Number of reportable segments | segment					3
Corporate, Reconciling Items, and Eliminations [Member]
Segment Information for our Reportable Segments
Revenues			(744)	(831)	$ (2,110)		(2,594)
Cost of sales:
Operating income			(256)	(246)	(749)		(732)
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)			246	234	727		695
Depreciation and amortization expense			12	10	51		34
Total expenditures for long-lived assets	[4]		24	9	56		33
Intersegment Eliminations [Member]
Segment Information for our Reportable Segments
Revenues			(744)	(831)	(2,110)		(2,594)
Cost of sales:
Cost of materials and other	[2]		(745)	(828)	(2,135)		(2,588)
Operating expenses (excluding depreciation and amortization expense reflected below)			0	1	(1)		1
Depreciation and amortization expense			(1)	(2)	(3)		(4)
Total cost of sales			(746)	(829)	(2,139)		(2,591)
Other operating expenses			0	0	0		0
Refining [Member]
Segment Information for our Reportable Segments
Revenues			30,414	31,332	87,495		94,519
Refining [Member] | Operating Segments [Member]
Segment Information for our Reportable Segments
Revenues			30,415	31,335	87,500		94,527
Cost of sales:
Cost of materials and other	[2]		26,684	28,922	77,995		85,528
Operating expenses (excluding depreciation and amortization expense reflected below)			1,388	1,256	3,986		3,659
Depreciation and amortization expense			728	589	2,029		1,793
Total cost of sales			28,800	30,767	84,010		90,980
Asset impairment loss		$ 1,100			1,131
Other operating expenses			5	3	13		13
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			1,610	565	2,346		3,534
Total expenditures for long-lived assets	[4]		324	344	1,231		1,191
Refining [Member] | Intersegment Eliminations [Member]
Segment Information for our Reportable Segments
Revenues			1	3	5		8
Renewable Diesel [Member]
Segment Information for our Reportable Segments
Revenues			719	632	1,777		1,888
Renewable Diesel [Member] | Operating Segments [Member]
Segment Information for our Reportable Segments
Revenues			1,203	1,225	3,201		3,820
Cost of sales:
Cost of materials and other	[2]		1,077	1,029	3,016		3,025
Operating expenses (excluding depreciation and amortization expense reflected below)			78	92	228		262
Depreciation and amortization expense			76	69	205		196
Total cost of sales			1,231	1,190	3,449		3,483
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			(28)	35	(248)		337
Total expenditures for long-lived assets	[4]		49	67	158		260
Segment Information (Textual)
Clean fuel production credit			206		397
Blender's tax credit				313			952
Renewable Diesel [Member] | Intersegment Eliminations [Member]
Segment Information for our Reportable Segments
Revenues			484	593	1,424		1,932
Ethanol [Member]
Segment Information for our Reportable Segments
Revenues			1,035	912	3,043		2,718
Ethanol [Member] | Operating Segments [Member]
Segment Information for our Reportable Segments
Revenues			1,294	1,147	3,724		3,372
Cost of sales:
Cost of materials and other	[2]		942	842	2,962		2,625
Operating expenses (excluding depreciation and amortization expense reflected below)			148	133	446		395
Depreciation and amortization expense			21	19	59		57
Total cost of sales			1,111	994	3,467		3,077
Asset impairment loss					0
Other operating expenses			0	0	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			183	153	257		268
Total expenditures for long-lived assets	[4]		12	9	30		26
Ethanol [Member] | Intersegment Eliminations [Member]
Segment Information for our Reportable Segments
Revenues			$ 259	$ 235	$ 681		$ 654

[1] Includes excise taxes on sales by certain of our foreign operations of $1,827 million and $1,539 million for the three months ended September 30, 2025 and 2024, respectively, and $4,993 million and $4,382 million for the nine months ended September 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 $206 million and $397 million for the three and nine months ended September 30, 2025, respectively, and the blender’s tax credit on qualified fuel mixtures of $313 million and $952 million for the three and nine months ended September 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.