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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, unless otherwise specified
 3 Months Ended 9 Months Ended
Mar. 31, 2014
Sep. 30, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivatives, assets   $ 310 $ 103
Derivatives, liabilities   (84) (121)
Redemptions of Auction Rate Securities 57 57  
Auction Rate Securities redeemed lower than carrying value 5    
Carrying Amount [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents   2,876 5,305
Debt   (12,059) (12,022)
Capital lease obligations   (21)  
Total Fair Value [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents   2,876 5,305
Debt   (13,410) (12,908)
Capital lease obligations   (21)  
Level 1 Inputs [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents   1,745 4,191
Level 2 Inputs [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents   1,131 1,114
Debt   (13,410) (12,908)
Capital lease obligations   (21)  
Long-Term Investments [Member] | Carrying Amount [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments     62
Long-Term Investments [Member] | Total Fair Value [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments     62
Long-Term Investments [Member] | Level 3 Inputs [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments     62
Commodity Derivatives [Member] | Carrying Amount [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivatives, assets   297 103
Derivatives, liabilities   (80) (120)
Commodity Derivatives [Member] | Total Fair Value [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivatives, assets   297 103
Derivatives, liabilities   (80) (120)
Commodity Derivatives [Member] | Level 2 Inputs [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivatives, assets   297 103
Derivatives, liabilities   (80) (120)
Interest Rate Derivatives [Member] | Carrying Amount [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivatives, assets   1  
Derivatives, liabilities   (2)  
Interest Rate Derivatives [Member] | Total Fair Value [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivatives, assets   1  
Derivatives, liabilities   (2)  
Interest Rate Derivatives [Member] | Level 2 Inputs [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivatives, assets   1  
Derivatives, liabilities   (2)  
Foreign Currency Derivatives [Member] | Carrying Amount [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivatives, assets   11  
Derivatives, liabilities     (1)
Foreign Currency Derivatives [Member] | Total Fair Value [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivatives, assets   11  
Derivatives, liabilities     (1)
Foreign Currency Derivatives [Member] | Level 2 Inputs [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivatives, assets   11  
Derivatives, liabilities     (1)
EnLink [Member] | Commodity Derivatives [Member] | Carrying Amount [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivatives, assets   1  
Derivatives, liabilities   (2)  
EnLink [Member] | Commodity Derivatives [Member] | Total Fair Value [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivatives, assets   1  
Derivatives, liabilities   (2)  
EnLink [Member] | Commodity Derivatives [Member] | Level 2 Inputs [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivatives, assets   1  
Derivatives, liabilities   $ (2)