Revenues and Segment Information, Components of Operating Income (Loss) (Details) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2020 USD ($) ethanol_plant refinery	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) ethanol_plant refinery segment	Jun. 30, 2019 USD ($)
Segment Information for our Reportable Segments
Revenues	[1]	$ 10,397	$ 28,933	$ 32,499	$ 53,196
Cost of materials and other		9,079	26,083	29,031	48,061
LCM inventory valuation adjustment		(2,248)	0	294	0
Operating expenses (excluding depreciation and amortization expense reflected below)		1,027	1,175	2,151	2,390
Depreciation and amortization expense		566	552	1,135	1,089
Total cost of sales		8,424	27,810	32,611	51,540
Other operating expenses		3	2	5	4
General and administrative expenses (excluding depreciation and amortization expense reflected below)		169	199	346	408
Depreciation and amortization expense		12	14	25	28
Operating income (loss)		$ 1,789	908	$ (488)	1,216
Disclosure of Entity's Reportable Segments (Textual)
Number of reportable segments | segment				3
Number of petroleum refineries | refinery		15		15
Number of ethanol plants | ethanol_plant		14		14
Corporate, Reconciling Items And Eliminations [Member]
Segment Information for our Reportable Segments
Revenues		$ (97)	(133)	$ (216)	(238)
Operating income (loss)		(182)	(213)	(373)	(436)
Corporate [Member]
Segment Information for our Reportable Segments
Revenues		0	1	0	1
General and administrative expenses (excluding depreciation and amortization expense reflected below)		169	199	346	408
Depreciation and amortization expense		12	14	25	28
Intersegment Eliminations [Member]
Segment Information for our Reportable Segments
Revenues		(97)	(134)	(216)	(239)
Cost of materials and other		(96)	(133)	(214)	(238)
LCM inventory valuation adjustment		0		0
Operating expenses (excluding depreciation and amortization expense reflected below)		0	0	0	0
Depreciation and amortization expense		0	0	0	0
Total cost of sales		(96)	(133)	(214)	(238)
Other operating expenses		0	0	0	0
Refining [Member]
Segment Information for our Reportable Segments
Revenues		9,615	27,746	30,600	50,964
Refining [Member] | Operating Segments [Member]
Segment Information for our Reportable Segments
Revenues		9,617	27,754	30,604	50,974
Cost of materials and other		8,539	25,172	27,666	46,337
LCM inventory valuation adjustment		(2,137)		277
Operating expenses (excluding depreciation and amortization expense reflected below)		928	1,026	1,923	2,097
Depreciation and amortization expense		533	518	1,069	1,021
Total cost of sales		7,863	26,716	30,935	49,455
Other operating expenses		3	1	5	3
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)		1,751	1,037	(336)	1,516
Refining [Member] | Intersegment Eliminations [Member]
Segment Information for our Reportable Segments
Revenues		2	8	4	10
Renewable Diesel [Member]
Segment Information for our Reportable Segments
Revenues		239	222	545	474
Renewable Diesel [Member] | Operating Segments [Member]
Segment Information for our Reportable Segments
Revenues		296	295	655	598
Cost of materials and other		135	189	265	413
LCM inventory valuation adjustment		0		0
Operating expenses (excluding depreciation and amortization expense reflected below)		20	17	40	36
Depreciation and amortization expense		12	12	23	23
Total cost of sales		167	218	328	472
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 (loss)		129	77	327	126
Renewable Diesel [Member] | Intersegment Eliminations [Member]
Segment Information for our Reportable Segments
Revenues		57	73	110	124
Ethanol [Member]
Segment Information for our Reportable Segments
Revenues		543	964	1,354	1,757
Ethanol [Member] | Operating Segments [Member]
Segment Information for our Reportable Segments
Revenues		581	1,017	1,456	1,862
Cost of materials and other		501	855	1,314	1,549
LCM inventory valuation adjustment		(111)		17
Operating expenses (excluding depreciation and amortization expense reflected below)		79	132	188	257
Depreciation and amortization expense		21	22	43	45
Total cost of sales		490	1,009	1,562	1,851
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)		91	7	(106)	10
Ethanol [Member] | Intersegment Eliminations [Member]
Segment Information for our Reportable Segments
Revenues		$ 38	$ 53	$ 102	$ 105

[1] Includes excise taxes on sales by certain of our international operations of $784 million and $1,410 million for the three months ended June 30, 2020 and 2019, respectively, and $2,152 million and $2,740 million for the six months ended June 30, 2020 and 2019, respectively.