Revenues and Segment Information, Components of Operating Income (Loss) (Details) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) segment	Sep. 30, 2020 USD ($)
Segment Information for our Reportable Segments
Revenues	[1]	$ 29,520	$ 15,809	$ 78,074	$ 48,308
Cost of sales:
Cost of materials and other		26,624	14,801	70,865	43,832
LCM inventory valuation adjustment		0	(313)	0	(19)
Operating expenses (excluding depreciation and amortization expense reflected below)		1,348	1,117	4,218	3,268
Depreciation and amortization expense		630	602	1,772	1,737
Total cost of sales		28,602	16,207	76,855	48,818
Other operating expenses		19	25	69	30
General and administrative expenses (excluding depreciation and amortization expense reflected below)		195	186	579	532
Depreciation and amortization expense		11	12	35	37
Operating income (loss)		693	(621)	$ 536	(1,109)
Disclosure of Entity's Reportable Segments (Textual)
Number of reportable segments | segment				3
Corporate, Reconciling Items And Eliminations [Member]
Segment Information for our Reportable Segments
Revenues		(178)	(100)	$ (481)	(316)
Cost of sales:
Operating income (loss)		(206)	(198)	(614)	(571)
Corporate [Member]
Segment Information for our Reportable Segments
Revenues		0	0	0	0
Cost of sales:
General and administrative expenses (excluding depreciation and amortization expense reflected below)		195	186	579	532
Depreciation and amortization expense		11	12	35	37
Intersegment Eliminations [Member]
Segment Information for our Reportable Segments
Revenues		(178)	(100)	(481)	(316)
Cost of sales:
Cost of materials and other		(177)	(100)	(480)	(314)
LCM inventory valuation adjustment			0		0
Operating expenses (excluding depreciation and amortization expense reflected below)		(1)	0	(1)	0
Depreciation and amortization expense		0	0	0	0
Total cost of sales		(178)	(100)	(481)	(314)
Other operating expenses		0	0	0	0
Refining [Member]
Segment Information for our Reportable Segments
Revenues		27,989	14,727	73,426	45,327
Refining [Member] | Operating Segments [Member]
Segment Information for our Reportable Segments
Revenues		27,992	14,729	73,433	45,333
Cost of sales:
Cost of materials and other		25,395	14,103	67,417	41,769
LCM inventory valuation adjustment			(296)		(19)
Operating expenses (excluding depreciation and amortization expense reflected below)		1,195	989	3,730	2,912
Depreciation and amortization expense		549	538	1,626	1,607
Total cost of sales		27,139	15,334	72,773	46,269
Other operating expenses		18	24	68	29
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 (loss)		835	(629)	592	(965)
Refining [Member] | Intersegment Eliminations [Member]
Segment Information for our Reportable Segments
Revenues		3	2	7	6
Renewable Diesel [Member]
Segment Information for our Reportable Segments
Revenues		342	305	1,190	850
Renewable Diesel [Member] | Operating Segments [Member]
Segment Information for our Reportable Segments
Revenues		402	345	1,405	1,000
Cost of sales:
Cost of materials and other		256	128	724	393
LCM inventory valuation adjustment			0		0
Operating expenses (excluding depreciation and amortization expense reflected below)		26	23	86	63
Depreciation and amortization expense		11	10	35	33
Total cost of sales		293	161	845	489
Other operating expenses		1	0	1	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 (loss)		108	184	559	511
Renewable Diesel [Member] | Intersegment Eliminations [Member]
Segment Information for our Reportable Segments
Revenues		60	40	215	150
Ethanol [Member]
Segment Information for our Reportable Segments
Revenues		1,189	777	3,458	2,131
Ethanol [Member] | Operating Segments [Member]
Segment Information for our Reportable Segments
Revenues		1,304	835	3,717	2,291
Cost of sales:
Cost of materials and other		1,150	670	3,204	1,984
LCM inventory valuation adjustment			(17)		0
Operating expenses (excluding depreciation and amortization expense reflected below)		128	105	403	293
Depreciation and amortization expense		70	54	111	97
Total cost of sales		1,348	812	3,718	2,374
Other operating expenses		0	1	0	1
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 (loss)		(44)	22	(1)	(84)
Ethanol [Member] | Intersegment Eliminations [Member]
Segment Information for our Reportable Segments
Revenues		$ 115	$ 58	$ 259	$ 160

[1] Includes excise taxes on sales by certain of our international operations of $1,610 million and $1,339 million for the three months ended September 30, 2021 and 2020, respectively, and $4,152 million and $3,491 million for the nine months ended September 30, 2021 and 2020, respectively.