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Financial Instruments and Derivatives (Income Statement) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Realized and Unrealized Before-Tax Gain / (Loss) on Derivative Instruments Recognized in the Consolidated Statement of Income        
Revenues $ 85,294 $ 90,016 $ 249,930 $ 266,159
Crude oil and product purchases (47,928) (51,261) (140,043) (153,061)
Not Designated as Hedging Instrument        
Realized and Unrealized Before-Tax Gain / (Loss) on Derivative Instruments Recognized in the Consolidated Statement of Income        
Revenues (31) 690 503 (205)
Crude oil and product purchases (17) (4) (11) (6)
Total $ (48) $ 686 $ 492 $ (211)