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Operating Segments and Geographic Data - Segment Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Segment Reporting Information [Line Items]    
Total Assets $ 256,938 $ 261,632
Goodwill 4,578 4,722
U.S.    
Segment Reporting Information [Line Items]    
Total Assets 103,549 102,108
Int'l.    
Segment Reporting Information [Line Items]    
Total Assets 148,811 154,802
Operating Segments    
Segment Reporting Information [Line Items]    
Total Assets 245,253 249,293
Operating Segments | Upstream    
Segment Reporting Information [Line Items]    
Total Assets 188,483 194,805
Goodwill 4,226 4,370
Operating Segments | Upstream | U.S.    
Segment Reporting Information [Line Items]    
Total Assets 60,914 58,750
Operating Segments | Upstream | Int'l.    
Segment Reporting Information [Line Items]    
Total Assets 123,343 131,685
Operating Segments | Downstream    
Segment Reporting Information [Line Items]    
Total Assets 56,770 54,488
Goodwill 352 352
Operating Segments | Downstream | U.S.    
Segment Reporting Information [Line Items]    
Total Assets 34,253 33,066
Operating Segments | Downstream | Int'l.    
Segment Reporting Information [Line Items]    
Total Assets 22,165 21,070
Segment Reporting, Reconciling Item    
Segment Reporting Information [Line Items]    
Total Assets 11,685 12,339
Segment Reporting, Reconciling Item | U.S.    
Segment Reporting Information [Line Items]    
Total Assets 8,382 10,292
Segment Reporting, Reconciling Item | Int'l.    
Segment Reporting Information [Line Items]    
Total Assets $ 3,303 $ 2,047