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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
Dec. 31, 2022
Dec. 31, 2021
Carrying Amount [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents $ 708 $ 1,421
Debt (6,440) (6,482)
Contingent earnout payments 157 184
Carrying Amount [Member] | Commodity Derivatives [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives, assets 131 8
Derivatives, liabilities (3) (577)
Total Fair Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 708 1,421
Debt (6,231) (7,644)
Contingent earnout payments 157 184
Total Fair Value [Member] | Commodity Derivatives [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives, assets 131 8
Derivatives, liabilities (3) (577)
Level 1 Inputs [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 708 1,421
Level 2 Inputs [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt (6,231) (7,644)
Level 2 Inputs [Member] | Commodity Derivatives [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives, assets 131 8
Derivatives, liabilities (3) (577)
Level 3 Inputs [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Contingent earnout payments $ 157 $ 184