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Sales and Other Operating Revenues (Disaggregated) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Disaggregation of Revenue [Line Items]        
Sales and other operating revenues $ 10,913 $ 27,847 $ 31,791 $ 50,950
United States        
Disaggregation of Revenue [Line Items]        
Sales and other operating revenues 8,377 21,867 24,087 39,442
United Kingdom        
Disaggregation of Revenue [Line Items]        
Sales and other operating revenues 972 2,512 3,281 4,943
Germany        
Disaggregation of Revenue [Line Items]        
Sales and other operating revenues 613 1,092 1,471 2,049
Other foreign countries        
Disaggregation of Revenue [Line Items]        
Sales and other operating revenues 951 2,376 2,952 4,516
Refined petroleum products        
Disaggregation of Revenue [Line Items]        
Sales and other operating revenues 8,701 22,922 24,858 41,715
Crude oil resales        
Disaggregation of Revenue [Line Items]        
Sales and other operating revenues 1,490 3,613 4,367 6,651
Natural gas liquids (NGL)        
Disaggregation of Revenue [Line Items]        
Sales and other operating revenues 700 1,179 1,679 2,483
Services and other        
Disaggregation of Revenue [Line Items]        
Sales and other operating revenues $ 22 $ 133 $ 887 $ 101