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Fair Value Measurements (Schedule Of Carrying Value And Fair Value Measurement Information For Financial Assets And Liabilities) (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Carrying Amount [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents $ 631 $ 319
Debt (8,391) (8,883)
Contingent earnout payments   20
Carrying Amount [Member] | Commodity Derivatives [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives, assets 155 56
Derivatives, liabilities (21) (33)
Total Fair Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 631 319
Debt (8,274) (8,520)
Contingent earnout payments   20
Total Fair Value [Member] | Commodity Derivatives [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives, assets 155 56
Derivatives, liabilities (21) (33)
Level 1 Inputs [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 631 319
Level 2 Inputs [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt (8,274) (8,520)
Level 2 Inputs [Member] | Commodity Derivatives [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives, assets 155 56
Derivatives, liabilities $ (21) (33)
Level 3 Inputs [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Contingent earnout payments   $ 20