Revenues and Segment Information, Disaggregation of Revenue by Product (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue by Segment
Revenues	[1]	$ 10,397	$ 28,933	$ 32,499	$ 53,196
Corporate [Member]
Revenue by Segment
Revenues		0	1	0	1
Other Revenues [Member] | Corporate [Member]
Revenue by Segment
Revenues		0	1	0	1
Refining [Member]
Revenue by Segment
Revenues		9,615	27,746	30,600	50,964
Refining [Member] | Gasoline and Blendstocks [Member]
Revenue by Segment
Revenues		3,993	11,530	12,237	20,904
Refining [Member] | Distillates [Member]
Revenue by Segment
Revenues		4,379	13,476	15,042	25,393
Refining [Member] | Other Product Revenues [Member]
Revenue by Segment
Revenues		1,243	2,740	3,321	4,667
Renewable Diesel [Member]
Revenue by Segment
Revenues		239	222	545	474
Renewable Diesel [Member] | Renewable Diesel [Member]
Revenue by Segment
Revenues		239	222	545	474
Ethanol [Member]
Revenue by Segment
Revenues		543	964	1,354	1,757
Ethanol [Member] | Ethanol [Member]
Revenue by Segment
Revenues		432	774	1,061	1,394
Ethanol [Member] | Distillers Grains [Member]
Revenue by Segment
Revenues		$ 111	$ 190	$ 293	$ 363

[1] Includes excise taxes on sales by certain of our international operations of $784 million and $1,410 million for the three months ended June 30, 2020 and 2019, respectively, and $2,152 million and $2,740 million for the six months ended June 30, 2020 and 2019, respectively.