Revenues and Segment Information, Disaggregation of Revenue by Product (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenue by Segment
Revenues	[1]	$ 15,809	$ 27,249	$ 48,308	$ 80,445
Corporate [Member]
Revenue by Segment
Revenues		0	1	0	2
Other Revenues [Member] | Corporate [Member]
Revenue by Segment
Revenues		0	1	0	2
Refining [Member]
Revenue by Segment
Revenues		14,727	26,145	45,327	77,109
Refining [Member] | Gasoline and Blendstocks [Member]
Revenue by Segment
Revenues		7,021	10,978	19,258	31,882
Refining [Member] | Distillates [Member]
Revenue by Segment
Revenues		6,327	12,861	21,369	38,254
Refining [Member] | Other Product Revenues [Member]
Revenue by Segment
Revenues		1,379	2,306	4,700	6,973
Renewable Diesel [Member]
Revenue by Segment
Revenues		305	212	850	686
Renewable Diesel [Member] | Renewable Diesel [Member]
Revenue by Segment
Revenues		305	212	850	686
Ethanol [Member]
Revenue by Segment
Revenues		777	891	2,131	2,648
Ethanol [Member] | Ethanol [Member]
Revenue by Segment
Revenues		624	714	1,685	2,108
Ethanol [Member] | Distillers Grains [Member]
Revenue by Segment
Revenues		$ 153	$ 177	$ 446	$ 540

[1] Includes excise taxes on sales by certain of our international operations of $1,339 million and $1,399 million for the three months ended September 30, 2020 and 2019, respectively, and $3,491 million and $4,139 million for the nine months ended September 30, 2020 and 2019, respectively.