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Segment Information (Reconciliation of Segment Revenues To Sales and Other Operating Revenues) (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Segment Reporting Information [Line Items]        
Sales and other operating revenues $ 53,795 $ 29,615 $ 91,853 [1] $ 52,326 [1]
Refining & Marketing        
Segment Reporting Information [Line Items]        
Sales and other operating revenues [1] 52,300 28,554 89,092 50,215
Midstream        
Segment Reporting Information [Line Items]        
Sales and other operating revenues [1] 1,495 1,061 2,761 2,111
Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 1,355 1,278 2,638 2,505
Intersegment Eliminations | Refining & Marketing        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 47 30 83 58
Intersegment Eliminations | Midstream        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 1,308 1,248 2,555 2,447
Operating Segments        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 55,150 30,893 94,491 54,831
Operating Segments | Refining & Marketing        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 52,347 28,584 89,175 50,273
Operating Segments | Midstream        
Segment Reporting Information [Line Items]        
Sales and other operating revenues $ 2,803 $ 2,309 $ 5,316 $ 4,558
[1] Includes related party sales. See Note 7 for additional information