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Derivatives and Risk Management Activities - Financial Impact (Details) - Derivatives Not Designated as a Hedge - Commodity derivatives - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Impact of derivative activities recognized in earnings        
Net gain/(loss) from commodity derivative activity $ 13 $ (40) $ (26) $ (73)
Product sales revenues        
Impact of derivative activities recognized in earnings        
Net gain/(loss) from commodity derivative activity 13 (36) (29) (64)
Field operating costs        
Impact of derivative activities recognized in earnings        
Net gain/(loss) from commodity derivative activity $ 0 $ (4) $ 3 $ (9)