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Debt And Related Expenses (Schedule Of Debt Instruments and Balances) (Parenthetical) (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Apr. 30, 2003
Dec. 31, 2017
Debt Instrument [Line Items]    
Short-term debt [1]   $ 115
8.25% Due July 1, 2018 [Member]    
Debt Instrument [Line Items]    
Debt interest rate, stated percentage   8.25%
Short-term debt   $ 20
Debt, maturity date   Jul. 01, 2018
8.25% Due July 1, 2018 [Member] | Ocean Energy [Member]    
Debt Instrument [Line Items]    
Debt interest rate, stated percentage 8.25%  
Fair value of notes assumed $ 147  
Effective interest rate of notes 5.50%  
7.50% due September 15, 2027 [Member] | Ocean Energy [Member]    
Debt Instrument [Line Items]    
Debt interest rate, stated percentage 7.50%  
Fair value of notes assumed $ 169  
Effective interest rate of notes 6.50%  
2.25% Due December 15, 2018 [Member]    
Debt Instrument [Line Items]    
Debt interest rate, stated percentage   2.25%
Short-term debt   $ 95
Debt, maturity date   Dec. 15, 2018
[1] 2017 short-term debt consists of $20 million of 8.25% senior notes due July 1, 2018 and $95 million of 2.25% senior notes due December 15, 2018.