Revenues and Segment Information, Disaggregation of Revenue by Product (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue by Segment
Revenues	[1]	$ 28,933	$ 31,015	$ 53,196	$ 57,454
Corporate [Member]
Revenue by Segment
Revenues		1	1	1	2
Corporate [Member] | Corporate - Other Revenues [Member]
Revenue by Segment
Revenues		1	1	1	2
Refining [Member]
Revenue by Segment
Revenues		27,746	30,024	50,964	55,477
Refining [Member] | Gasoline and Blendstocks [Member]
Revenue by Segment
Revenues		11,530	12,514	20,904	23,143
Refining [Member] | Distillates [Member]
Revenue by Segment
Revenues		13,476	14,353	25,393	26,903
Refining [Member] | Other Product Revenues [Member]
Revenue by Segment
Revenues		2,740	3,157	4,667	5,431
Ethanol [Member]
Revenue by Segment
Revenues		964	884	1,757	1,761
Ethanol [Member] | Ethanol [Member]
Revenue by Segment
Revenues		774	696	1,394	1,397
Ethanol [Member] | Distillers Grains [Member]
Revenue by Segment
Revenues		190	188	363	364
Renewable Diesel [Member]
Revenue by Segment
Revenues		222	106	474	214
Renewable Diesel [Member] | Renewable Diesel [Member]
Revenue by Segment
Revenues		$ 222	$ 106	$ 474	$ 214

[1] Includes excise taxes on sales by certain of our international operations of $1,410 million and $1,470 million for the three months ended June 30, 2019 and 2018, respectively, and $2,740 million and $2,934 million for the six months ended June 30, 2019 and 2018, respectively.