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Accounts Receivable (Schedule Of Components Of Accounts Receivable) (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Joint interest billings $ 198 $ 150
Other 27 15
Gross accounts receivable 848 862
Allowance for doubtful accounts (6) (7)
Net accounts receivable 842 855
Oil, Gas and NGL Sales [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross accounts receivable 368 413
Marketing Revenues [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross accounts receivable $ 255 $ 284