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Debt And Related Expenses (Schedule Of Debt Instruments and Balances) (Parenthetical) (Details) - USD ($)
$ in Millions
1 Months Ended
Apr. 30, 2003
Dec. 31, 2021
Debt Instrument [Line Items]    
Long-term debt, gross   $ 6,363
WPX    
Debt Instrument [Line Items]    
Long-term debt, gross   $ 51
Ocean Energy [Member]    
Debt Instrument [Line Items]    
Fair value of notes assumed $ 169  
Effective interest rate of notes 6.50%