Revenues and Segment Information, Components of Operating Income (Details) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2018 USD ($) refinery ethanol_plant	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) refinery ethanol_plant segment	Jun. 30, 2017 USD ($)
Segment Information for our Reportable Segments
Revenues	[1]	$ 31,015	$ 22,254	$ 57,454	$ 44,026
Cost of materials and other		27,860	19,609	51,616	39,037
Operating expenses (excluding depreciation and amortization expense reflected below)		1,110	1,111	2,246	2,235
Depreciation and amortization expense		510	485	995	973
Total cost of sales		29,480	21,205	54,857	42,245
Other operating expenses		21	0	31	0
General and administrative expenses (excluding depreciation and amortization expense reflected below)		248	175	486	367
Depreciation and amortization expense		13	14	26	26
Operating income		$ 1,253	860	$ 2,054	1,388
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		11		11
Corporate, Reconciling Items And Eliminations [Member]
Segment Information for our Reportable Segments
Revenues		$ (177)	(138)	$ (358)	(304)
Operating income		(260)	(187)	(510)	(391)
Corporate [Member]
Segment Information for our Reportable Segments
Revenues		1	0	2	0
General and administrative expenses (excluding depreciation and amortization expense reflected below)		248	175	486	367
Depreciation and amortization expense		13	14	26	26
Intersegment Eliminations [Member]
Segment Information for our Reportable Segments
Revenues		(178)	(138)	(360)	(304)
Cost of materials and other		(177)	(138)	(358)	(304)
Operating expenses (excluding depreciation and amortization expense reflected below)		(1)	(2)	(2)	(2)
Depreciation and amortization expense		0	0	0	0
Total cost of sales		(178)	(140)	(360)	(306)
Other operating expenses		0		0
Refining [Member]
Segment Information for our Reportable Segments
Revenues		30,130	21,415	55,691	42,302
Refining [Member] | Operating Segments [Member]
Segment Information for our Reportable Segments
Revenues		30,131	21,415	55,696	42,302
Cost of materials and other		27,283	19,037	50,471	37,844
Operating expenses (excluding depreciation and amortization expense reflected below)		969	979	1,966	1,970
Depreciation and amortization expense		471	454	919	903
Total cost of sales		28,723	20,470	53,356	40,717
Other operating expenses		21		31
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		1,387	945	2,309	1,585
Refining [Member] | Intersegment Eliminations [Member]
Segment Information for our Reportable Segments
Revenues		1	0	5	0
Ethanol [Member]
Segment Information for our Reportable Segments
Revenues		884	839	1,761	1,724
Ethanol [Member] | Operating Segments [Member]
Segment Information for our Reportable Segments
Revenues		926	867	1,849	1,812
Cost of materials and other		754	710	1,503	1,497
Operating expenses (excluding depreciation and amortization expense reflected below)		109	107	220	216
Depreciation and amortization expense		20	19	38	46
Total cost of sales		883	836	1,761	1,759
Other operating expenses		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		43	31	88	53
Ethanol [Member] | Intersegment Eliminations [Member]
Segment Information for our Reportable Segments
Revenues		42	28	88	88
VLP [Member]
Segment Information for our Reportable Segments
Revenues		0	0	0	0
VLP [Member] | Operating Segments [Member]
Segment Information for our Reportable Segments
Revenues		135	110	267	216
Cost of materials and other		0	0	0	0
Operating expenses (excluding depreciation and amortization expense reflected below)		33	27	62	51
Depreciation and amortization expense		19	12	38	24
Total cost of sales		52	39	100	75
Other operating expenses		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		83	71	167	141
VLP [Member] | Intersegment Eliminations [Member]
Segment Information for our Reportable Segments
Revenues		$ 135	$ 110	$ 267	$ 216

[1] Includes excise taxes on sales by certain of our international operations of $1,470 million and $1,384 million for the three months ended June 30, 2018 and 2017, respectively, and $2,934 million and $2,656 million for the six months ended June 30, 2018 and 2017, respectively.