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Impairments (Schedule of Goodwill) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2020
Jun. 30, 2020
Goodwill [Line Items]    
Goodwill, beginning balance $ 20,040 $ 20,040
Impairments (7,330) (7,330)
Transfers   0
Goodwill, ending balance   12,710
Refining & Marketing    
Goodwill [Line Items]    
Goodwill, beginning balance 5,572 5,572
Impairments   (5,516)
Transfers   (56)
Goodwill, ending balance   0
Retail    
Goodwill [Line Items]    
Goodwill, beginning balance 4,951 4,951
Impairments   0
Transfers   0
Goodwill, ending balance   4,951
Midstream    
Goodwill [Line Items]    
Goodwill, beginning balance $ 9,517 9,517
Impairments   (1,814)
Transfers   56
Goodwill, ending balance   $ 7,759