Revenues and Segment Information, Disaggregation of Revenue by Product (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue by Segment
Revenues	[1]	$ 31,015	$ 22,254	$ 57,454	$ 44,026
Corporate, Reconciling Items And Eliminations [Member]
Revenue by Segment
Revenues		(177)	(138)	(358)	(304)
Corporate [Member]
Revenue by Segment
Revenues		1	0	2	0
Corporate - Other Revenues [Member] | Corporate [Member]
Revenue by Segment
Revenues		1	0	2	0
Refining [Member]
Revenue by Segment
Revenues		30,130	21,415	55,691	42,302
Refining [Member] | Operating Segments [Member]
Revenue by Segment
Revenues		30,131	21,415	55,696	42,302
Refining [Member] | Gasoline and Blendstocks [Member]
Revenue by Segment
Revenues		12,514	9,723	23,143	19,058
Refining [Member] | Distillates [Member]
Revenue by Segment
Revenues		14,459	9,736	27,117	19,432
Refining [Member] | Other Product Revenues [Member]
Revenue by Segment
Revenues		3,157	1,956	5,431	3,812
Ethanol [Member]
Revenue by Segment
Revenues		884	839	1,761	1,724
Ethanol [Member] | Operating Segments [Member]
Revenue by Segment
Revenues		926	867	1,849	1,812
Ethanol [Member] | Ethanol Product [Member]
Revenue by Segment
Revenues		696	712	1,397	1,462
Ethanol [Member] | Distillers Grains [Member]
Revenue by Segment
Revenues		188	127	364	262
VLP [Member]
Revenue by Segment
Revenues		0	0	0	0
VLP [Member] | Operating Segments [Member]
Revenue by Segment
Revenues		135	110	267	216
VLP [Member] | Eliminations And Reconciling Items [Member]
Revenue by Segment
Revenues		(135)	(110)	(267)	(216)
VLP [Member] | Pipeline Transportation [Member] | Operating Segments [Member]
Revenue by Segment
Revenues		31	25	62	48
VLP [Member] | Terminaling [Member] | Operating Segments [Member]
Revenue by Segment
Revenues		103	84	202	167
VLP [Member] | Storage and Other [Member] | Operating Segments [Member]
Revenue by Segment
Revenues		$ 1	$ 1	$ 3	$ 1

[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.