Revenues and Segment Information, Disaggregation of Revenue by Product (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenue by Segment
Revenues	[1]	$ 29,520	$ 15,809	$ 78,074	$ 48,308
Refining [Member]
Revenue by Segment
Revenues		27,989	14,727	73,426	45,327
Refining [Member] | Gasoline and Blendstocks [Member]
Revenue by Segment
Revenues		13,132	7,021	34,293	19,258
Refining [Member] | Distillates [Member]
Revenue by Segment
Revenues		11,588	6,327	31,044	21,369
Refining [Member] | Other Product Revenues [Member]
Revenue by Segment
Revenues		3,269	1,379	8,089	4,700
Renewable Diesel [Member]
Revenue by Segment
Revenues		342	305	1,190	850
Renewable Diesel [Member] | Renewable Diesel [Member]
Revenue by Segment
Revenues		342	305	1,190	850
Ethanol [Member]
Revenue by Segment
Revenues		1,189	777	3,458	2,131
Ethanol [Member] | Ethanol [Member]
Revenue by Segment
Revenues		948	624	2,683	1,685
Ethanol [Member] | Distillers Grains [Member]
Revenue by Segment
Revenues		$ 241	$ 153	$ 775	$ 446

[1] Includes excise taxes on sales by certain of our international operations of $1,610 million and $1,339 million for the three months ended September 30, 2021 and 2020, respectively, and $4,152 million and $3,491 million for the nine months ended September 30, 2021 and 2020, respectively.