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Impairments - Schedule of Impairments (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Goodwill [Line Items]        
Impairments $ 0 $ 0 $ 198 $ 3,006
Midstream        
Goodwill [Line Items]        
Impairments 0      
Midstream | Operating Segments        
Goodwill [Line Items]        
Impairments 0 0 198 1,161
Refining | Operating Segments        
Goodwill [Line Items]        
Impairments $ 0 $ 0 $ 0 $ 1,845