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Inventories - Schedule of Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Inventory Disclosure [Abstract]    
Crude oil and natural gas $ 852 $ 907
Materials and supplies 869 902
Total inventories 1,721 1,809
Inventories valued on the LIFO basis $ 509 $ 578