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Segment Information (Reconciliation of Segment Revenues To Sales and Other Operating Revenues) (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Segment Reporting Information [Line Items]    
Sales and other operating revenues [1] $ 32,706 $ 34,864
Refining & Marketing    
Segment Reporting Information [Line Items]    
Sales and other operating revenues [1] 31,485 33,663
Midstream    
Segment Reporting Information [Line Items]    
Sales and other operating revenues [1] 1,221 1,201
Operating Segments    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 34,146 36,253
Operating Segments | Refining & Marketing    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 31,522 33,690
Operating Segments | Midstream    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 2,624 2,563
Intersegment Eliminations    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 1,440 1,389
Intersegment Eliminations | Refining & Marketing    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 37 27
Intersegment Eliminations | Midstream    
Segment Reporting Information [Line Items]    
Sales and other operating revenues $ 1,403 $ 1,362
[1] Includes related party sales. See Note 6 for additional information.