Revenues and Segment Information, Disaggregation of Revenue by Product (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue by Segment
Revenues	[1]	$ 27,249	$ 30,849	$ 80,445	$ 88,303
Corporate [Member]
Revenue by Segment
Revenues		1	1	2	3
Corporate [Member] | Corporate - Other Revenues [Member]
Revenue by Segment
Revenues		1	1	2	3
Refining [Member]
Revenue by Segment
Revenues		26,145	29,894	77,109	85,371
Refining [Member] | Gasoline and Blendstocks [Member]
Revenue by Segment
Revenues		10,978	12,660	31,882	35,803
Refining [Member] | Distillates [Member]
Revenue by Segment
Revenues		12,861	13,963	38,254	40,866
Refining [Member] | Other Product Revenues [Member]
Revenue by Segment
Revenues		2,306	3,271	6,973	8,702
Ethanol [Member]
Revenue by Segment
Revenues		891	864	2,648	2,625
Ethanol [Member] | Ethanol [Member]
Revenue by Segment
Revenues		714	695	2,108	2,092
Ethanol [Member] | Distillers Grains [Member]
Revenue by Segment
Revenues		177	169	540	533
Renewable Diesel [Member]
Revenue by Segment
Revenues		212	90	686	304
Renewable Diesel [Member] | Renewable Diesel [Member]
Revenue by Segment
Revenues		$ 212	$ 90	$ 686	$ 304

[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.