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Derivative Financial Instruments (Derivatives Income Statement Location) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net income Net income Net income
Derivative, Gain (Loss) on Derivative, Net $ 7 $ (9) $ (4)
Purchased product costs      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Instruments Not Designated as Hedging Instruments, Realized Gain (Loss), Net (10) (13) (11)
Unrealized Gain (Loss) on Derivatives and Commodity Contracts $ 17 $ 3 $ 0
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Cost of revenues (excludes items below) Cost of revenues (excludes items below) Cost of revenues (excludes items below)
Derivative, Gain (Loss) on Derivative, Net $ 7 $ (10) $ (11)
Product sales      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Instruments Not Designated as Hedging Instruments, Realized Gain (Loss), Net $ 0 $ 1 $ 7
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Revenue from Contract with Customer, Excluding Assessed Tax, Third parties Revenue from Contract with Customer, Excluding Assessed Tax, Third parties Revenue from Contract with Customer, Excluding Assessed Tax, Third parties
Derivative, Gain (Loss) on Derivative, Net $ 0 $ 1 $ 7