Revenues and Segment Information, Components of Operating Income (Loss) (Details) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2019 USD ($) refinery ethanol_plant	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) refinery ethanol_plant segment	Sep. 30, 2018 USD ($)
Segment Information for our Reportable Segments
Revenues	[1]	$ 27,249	$ 30,849	$ 80,445	$ 88,303
Cost of materials and other		24,335	27,701	72,396	79,317
Operating expenses (excluding depreciation and amortization expense reflected below)		1,239	1,193	3,629	3,439
Depreciation and amortization expense		556	504	1,645	1,499
Total cost of sales		26,130	29,398	77,670	84,255
Other operating expenses		10	10	14	41
General and administrative expenses (excluding depreciation and amortization expense reflected below)		217	209	625	695
Depreciation and amortization expense		11	13	39	39
Operating income (loss)		$ 881	1,219	$ 2,097	3,273
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		$ (108)	(87)	$ (346)	(276)
Operating income (loss)		(228)	(221)	(664)	(731)
Corporate [Member]
Segment Information for our Reportable Segments
Revenues		1	1	2	3
General and administrative expenses (excluding depreciation and amortization expense reflected below)		217	209	625	695
Depreciation and amortization expense		11	13	39	39
Intersegment Eliminations [Member]
Segment Information for our Reportable Segments
Revenues		(109)	(88)	(348)	(279)
Cost of materials and other		(108)	(88)	(346)	(279)
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		(108)	(88)	(346)	(279)
Other operating expenses		0	0	0	0
Refining [Member]
Segment Information for our Reportable Segments
Revenues		26,145	29,894	77,109	85,371
Refining [Member] | Operating Segments [Member]
Segment Information for our Reportable Segments
Revenues		26,147	29,899	77,121	85,391
Cost of materials and other		23,432	26,928	69,769	77,195
Operating expenses (excluding depreciation and amortization expense reflected below)		1,100	1,058	3,197	3,057
Depreciation and amortization expense		518	479	1,539	1,423
Total cost of sales		25,050	28,465	74,505	81,675
Other operating expenses		10	10	13	41
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)		1,087	1,424	2,603	3,675
Refining [Member] | Intersegment Eliminations [Member]
Segment Information for our Reportable Segments
Revenues		2	5	12	20
Ethanol [Member]
Segment Information for our Reportable Segments
Revenues		891	864	2,648	2,625
Ethanol [Member] | Operating Segments [Member]
Segment Information for our Reportable Segments
Revenues		948	932	2,810	2,781
Cost of materials and other		847	776	2,396	2,279
Operating expenses (excluding depreciation and amortization expense reflected below)		121	116	378	336
Depreciation and amortization expense		23	19	68	57
Total cost of sales		991	911	2,842	2,672
Other operating expenses		0	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)		(43)	21	(33)	109
Ethanol [Member] | Intersegment Eliminations [Member]
Segment Information for our Reportable Segments
Revenues		57	68	162	156
Renewable Diesel [Member]
Segment Information for our Reportable Segments
Revenues		212	90	686	304
Renewable Diesel [Member] | Operating Segments [Member]
Segment Information for our Reportable Segments
Revenues		262	105	860	407
Cost of materials and other		164	85	577	122
Operating expenses (excluding depreciation and amortization expense reflected below)		18	19	54	46
Depreciation and amortization expense		15	6	38	19
Total cost of sales		197	110	669	187
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)		65	(5)	191	220
Renewable Diesel [Member] | Intersegment Eliminations [Member]
Segment Information for our Reportable Segments
Revenues		$ 50	$ 15	$ 174	$ 103

[1] Includes excise taxes on sales by certain of our international operations of $1,399 million and $1,338 million for the three months ended September 30, 2019 and 2018, respectively, and $4,139 million and $4,272 million for the nine months ended September 30, 2019 and 2018, respectively.