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Revenues and Segment Information, Revenue by Product (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
 [1]
Sep. 30, 2020
 [1],[2]
Jun. 30, 2020
 [2]
Mar. 31, 2020
 [2]
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenue by Segment                      
Revenues $ 16,604 $ 15,809 $ 10,397 $ 22,102 $ 27,879 $ 27,249 $ 28,933 $ 24,263 $ 64,912 [3] $ 108,324 [3] $ 117,033 [3]
Corporate [Member]                      
Revenue by Segment                      
Revenues                 0 2 4
Corporate [Member] | Other Revenues [Member]                      
Revenue by Segment                      
Revenues                 0 2 4
Refining [Member]                      
Revenue by Segment                      
Revenues                 60,840 103,746 113,093
Refining [Member] | Gasoline and Blendstocks [Member]                      
Revenue by Segment                      
Revenues                 26,278 42,798 46,596
Refining [Member] | Distillates [Member]                      
Revenue by Segment                      
Revenues                 28,234 51,942 55,037
Refining [Member] | Other Product Revenues [Member]                      
Revenue by Segment                      
Revenues                 6,328 9,006 11,460
Renewable Diesel [Member]                      
Revenue by Segment                      
Revenues                 1,055 970 508
Renewable Diesel [Member] | Renewable Diesel [Member]                      
Revenue by Segment                      
Revenues                 1,055 970 508
Ethanol [Member]                      
Revenue by Segment                      
Revenues                 3,017 3,606 3,428
Ethanol [Member] | Ethanol [Member]                      
Revenue by Segment                      
Revenues                 2,353 2,889 2,713
Ethanol [Member] | Distillers Grains [Member]                      
Revenue by Segment                      
Revenues                 $ 664 $ 717 $ 715
[1] We recorded a charge of $326 million in September 2020 due to the expected liquidation of LIFO inventory layers as described in Note 5. We recognized a benefit of $102 million in December 2020 to adjust the $326 million estimate to the $224 million actual charge for the year ended December 31, 2020.
[2] The market value of our inventories accounted for under the LIFO method fell below their historical cost on an aggregate basis as of March 31, 2020. As a result, we recorded an LCM inventory valuation adjustment of $2.5 billion in March 2020 as described in Note 5. The market value of our LIFO inventories improved due to the subsequent recovery in market prices, which resulted in a reversal of $2.2 billion in the quarter ended June 30, 2020 and the remaining amount in the quarter ended September 30, 2020.
[3] Includes excise taxes on sales by certain of our international operations of $4,797 million, $5,595 million, and $5,626 million for the years ended December 31, 2020, 2019, and 2018.