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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
Sep. 30, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives, assets $ 695 $ 2,004
Derivatives, liabilities (55) (57)
Carrying Amount [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 1,271 950
Debt (11,900) (11,262)
Capital lease obligations (18) (20)
Total Fair Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 1,271 950
Debt (12,113) (12,472)
Capital lease obligations (17) (20)
Level 1 Inputs [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 841 340
Level 2 Inputs [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 430 610
Debt (12,113) (12,472)
Capital lease obligations (17) (20)
Commodity Derivatives [Member] | Carrying Amount [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives, assets 691 1,995
Derivatives, liabilities (24) (56)
Commodity Derivatives [Member] | Total Fair Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives, assets 691 1,995
Derivatives, liabilities (24) (56)
Commodity Derivatives [Member] | Level 2 Inputs [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives, assets 691 1,995
Derivatives, liabilities (24) (56)
Interest Rate Derivatives [Member] | Carrying Amount [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives, assets 2 1
Derivatives, liabilities (31) (1)
Interest Rate Derivatives [Member] | Total Fair Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives, assets 2 1
Derivatives, liabilities (31) (1)
Interest Rate Derivatives [Member] | Level 2 Inputs [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives, assets 2 1
Derivatives, liabilities (31) (1)
Foreign Currency Derivatives [Member] | Carrying Amount [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives, assets 2 8
Foreign Currency Derivatives [Member] | Total Fair Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives, assets 2 8
Foreign Currency Derivatives [Member] | Level 2 Inputs [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives, assets $ 2 $ 8