Segment Information, Revenue by Product (Details) - USD ($) $ in Millions	3 Months Ended											12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	[1]	Mar. 31, 2016	[2]	Dec. 31, 2015	[3]	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014
Revenue from External Customer [Line Items]
Operating revenues	$ 20,712	$ 19,649	$ 19,584		$ 15,714		$ 18,777		$ 22,579	$ 25,118	$ 21,330	$ 75,659	[4]	$ 87,804	[4]	$ 130,844	[4]
Refining [Member]
Revenue from External Customer [Line Items]
Operating revenues												71,968		84,521		126,004
Refining [Member] | Gasoline and Blendstocks [Member]
Revenue from External Customer [Line Items]
Operating revenues												33,450		38,983		56,846
Refining [Member] | Distillates [Member]
Revenue from External Customer [Line Items]
Operating revenues												32,576		38,093		57,521
Refining [Member] | Other Product Revenues [Member]
Revenue from External Customer [Line Items]
Operating revenues												5,942		7,445		11,637
Ethanol [Member]
Revenue from External Customer [Line Items]
Operating revenues												3,691		3,283		4,840
Ethanol [Member] | Ethanol [Member]
Revenue from External Customer [Line Items]
Operating revenues												3,105		2,628		4,192
Ethanol [Member] | Distillers Grains [Member]
Revenue from External Customer [Line Items]
Operating revenues												$ 586		$ 655		$ 648

[1] Operating income for the quarter ended June 30, 2016 reflects a favorable noncash lower of cost or market inventory valuation adjustment of $454 million as described in Note 4 and an asset impairment loss of $56 million related to the Aruba Disposition as described in Note 2.

[2] Operating income for the quarter ended March 31, 2016 reflects a favorable noncash lower of cost or market inventory valuation adjustment of $293 million as described in Note 4.

[3] Operating income for the quarter ended December 31, 2015 reflects an unfavorable noncash lower of cost or market inventory valuation adjustment of $790 million as described in Note 4.

[4] Includes excise taxes on sales by certain of our international operations of $5,493 million, $5,980 million, and $5,901 million.