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Accounts Receivable (Schedule Of Components Of Accounts Receivable) (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Joint interest billings $ 393 $ 447
Other 54 61
Gross accounts receivable 2,020 1,531
Allowance for doubtful accounts (11) (11)
Net accounts receivable 2,009 1,520
Oil, Gas And NGL Sales [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross accounts receivable 899 851
Marketing And Midstream Revenues [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross accounts receivable $ 674 $ 172