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Segment Information (Reconciliation of Segment Revenues To Sales and Other Operating Revenues) (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Segment Reporting Information [Line Items]        
Sales and other operating revenues [1] $ 35,107 $ 40,917 $ 105,727 $ 112,124
Refining & Marketing        
Segment Reporting Information [Line Items]        
Sales and other operating revenues [1] 33,775 39,625 101,914 108,455
Midstream        
Segment Reporting Information [Line Items]        
Sales and other operating revenues [1] 1,332 1,292 3,813 3,669
Operating Segments        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 36,611 42,381 110,153 116,345
Operating Segments | Refining & Marketing        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 33,811 39,655 102,021 108,533
Operating Segments | Midstream        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 2,800 2,726 8,132 7,812
Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 1,504 1,464 4,426 4,221
Intersegment Eliminations | Refining & Marketing        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 36 30 107 78
Intersegment Eliminations | Midstream        
Segment Reporting Information [Line Items]        
Sales and other operating revenues $ 1,468 $ 1,434 $ 4,319 $ 4,143
[1] Includes sales to related parties. See Note 6 for additional information.