Segment Information, Activity (Details) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) segment	Sep. 30, 2016 USD ($)
Segment Information for our Reportable Segments
Operating revenues	[1]	$ 23,562	$ 19,649	$ 67,588	$ 54,947
Cost of materials and other		20,329	17,033	59,366	47,660
Operating expenses (excluding depreciation and amortization expense reflected below)		1,125	1,062	3,339	3,093
Depreciation and amortization expense		484	458	1,457	1,391
Lower of cost or market inventory valuation adjustment		0	0	0	(747)
Total cost of sales		21,938	18,553	64,162	51,397
Other operating expenses		44	0	44	0
General and administrative expenses (excluding depreciation and amortization expense reflected below)		229	192	597	507
Depreciation and amortization expense		13	12	39	35
Asset impairment loss		0	0	0	56
Operating income		1,338	892	$ 2,746	2,952
Disclosure of Entity's Reportable Segments (Textual)
Number of reportable segments | segment				3
Intersegment Eliminations [Member]
Segment Information for our Reportable Segments
Operating revenues		(159)	(148)	$ (463)	(393)
Corporate, Non-Segment [Member]
Segment Information for our Reportable Segments
Operating revenues		(159)	(148)	(463)	(393)
Cost of materials and other		(158)	(148)	(462)	(393)
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		(159)	(148)	(463)	(393)
Other operating expenses		0		0
General and administrative expenses (excluding depreciation and amortization expense reflected below)		229	192	597	507
Depreciation and amortization expense		13	12	39	35
Asset impairment loss					0
Operating income		(242)	(204)	(636)	(542)
Refining [Member]
Segment Information for our Reportable Segments
Operating revenues		22,728	18,718	65,030	52,302
Refining [Member] | Intersegment Eliminations [Member]
Segment Information for our Reportable Segments
Operating revenues		1	0	1	0
Refining [Member] | Operating Segments [Member]
Segment Information for our Reportable Segments
Operating revenues		22,729	18,718	65,031	52,302
Cost of materials and other		19,818	16,424	57,662	45,790
Operating expenses (excluding depreciation and amortization expense reflected below)		986	931	2,935	2,716
Depreciation and amortization expense		455	429	1,358	1,308
Lower of cost or market inventory valuation adjustment					(697)
Total cost of sales		21,259	17,784	61,955	49,117
Other operating expenses		41		41
General and administrative expenses (excluding depreciation and amortization expense reflected below)		0	0	0	0
Depreciation and amortization expense		0	0	0	0
Asset impairment loss					56
Operating income		1,429	934	3,035	3,129
Ethanol [Member]
Segment Information for our Reportable Segments
Operating revenues		834	931	2,558	2,645
Ethanol [Member] | Intersegment Eliminations [Member]
Segment Information for our Reportable Segments
Operating revenues		48	56	136	135
Ethanol [Member] | Operating Segments [Member]
Segment Information for our Reportable Segments
Operating revenues		882	987	2,694	2,780
Cost of materials and other		669	757	2,166	2,263
Operating expenses (excluding depreciation and amortization expense reflected below)		114	107	330	305
Depreciation and amortization expense		17	17	63	48
Lower of cost or market inventory valuation adjustment					(50)
Total cost of sales		800	881	2,559	2,566
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
Asset impairment loss					0
Operating income		82	106	135	214
VLP [Member]
Segment Information for our Reportable Segments
Operating revenues		0	0	0	0
VLP [Member] | Intersegment Eliminations [Member]
Segment Information for our Reportable Segments
Operating revenues		110	92	326	258
VLP [Member] | Operating Segments [Member]
Segment Information for our Reportable Segments
Operating revenues		110	92	326	258
Cost of materials and other		0	0	0	0
Operating expenses (excluding depreciation and amortization expense reflected below)		26	24	75	72
Depreciation and amortization expense		12	12	36	35
Lower of cost or market inventory valuation adjustment					0
Total cost of sales		38	36	111	107
Other operating expenses		3		3
General and administrative expenses (excluding depreciation and amortization expense reflected below)		0	0	0	0
Depreciation and amortization expense		0	0	0	0
Asset impairment loss					0
Operating income		$ 69	$ 56	$ 212	$ 151

[1] Includes excise taxes on sales by certain of our international operations of $1,447 million and $1,398 million for the three months ended September 30, 2017 and 2016, respectively, and $4,103 million and $4,263 million for the nine months ended September 30, 2017 and 2016, respectively.