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Derivatives and Risk Management Activities (Details 5) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
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Sep. 30, 2012
Sep. 30, 2013
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Sep. 30, 2012
Dec. 31, 2012
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Derivatives disclosures          
Asset Derivatives Fair Value $ 98   $ 98   $ 191
Liability Derivatives Fair Value (115)   (115)   (189)
Net (loss) deferred in AOCI (104)   (104)    
Net gains (loss) expected to be reclassified to earnings in next 12 months     (28)    
Gain (loss) expected to be reclassified to earnings through 2045     (76)    
Net deferred gain/(loss) recognized in AOCI on derivatives (effective portion) 78 97 140 69  
Broker receivable 164   164   41
Initial margin 96   96   69
Variation margin paid/(received)     68   (28)
Number of outstanding derivatives containing credit-risk related contingent features 0   0   0
Derivative credit-risk related contingent features     none of our outstanding derivatives contained credit-risk related contingent features that would result in a material adverse impact to us upon any change in our credit ratings    
Commodity
          
Derivatives disclosures          
Net deferred gain/(loss) recognized in AOCI on derivatives (effective portion) 66 88 77 88  
Interest Rate Contracts
          
Derivatives disclosures          
Net deferred gain/(loss) recognized in AOCI on derivatives (effective portion) 12 9 63 (19)  
Derivatives designated as hedging instruments
          
Derivatives disclosures          
Asset Derivatives Fair Value 22   22   56
Liability Derivatives Fair Value (14)   (14)   (62)
Derivatives designated as hedging instruments | Commodity | Other current assets
          
Derivatives disclosures          
Asset Derivatives Fair Value 3   3   45
Liability Derivatives Fair Value (13)   (13)   (23)
Derivatives designated as hedging instruments | Commodity | Other long-term assets
          
Derivatives disclosures          
Asset Derivatives Fair Value 2   2   11
Liability Derivatives Fair Value         (1)
Derivatives designated as hedging instruments | Interest Rate Contracts | Other long-term assets
          
Derivatives disclosures          
Asset Derivatives Fair Value 17   17    
Derivatives designated as hedging instruments | Interest Rate Contracts | Other current liabilities
          
Derivatives disclosures          
Liability Derivatives Fair Value (1)   (1)    
Derivatives designated as hedging instruments | Interest Rate Contracts | Other long term liabilities
          
Derivatives disclosures          
Liability Derivatives Fair Value         (38)
Derivatives not designated as hedging instruments
          
Derivatives disclosures          
Asset Derivatives Fair Value 76   76   135
Liability Derivatives Fair Value (101)   (101)   (127)
Derivatives not designated as hedging instruments | Commodity | Other current assets
          
Derivatives disclosures          
Asset Derivatives Fair Value 67   67   128
Liability Derivatives Fair Value (89)   (89)   (115)
Derivatives not designated as hedging instruments | Commodity | Other long-term assets
          
Derivatives disclosures          
Asset Derivatives Fair Value 7   7   1
Liability Derivatives Fair Value (7)   (7)   (3)
Derivatives not designated as hedging instruments | Commodity | Other current liabilities
          
Derivatives disclosures          
Asset Derivatives Fair Value 1   1   4
Liability Derivatives Fair Value (4)   (4)   (7)
Derivatives not designated as hedging instruments | Commodity | Other long term liabilities
          
Derivatives disclosures          
Asset Derivatives Fair Value         2
Liability Derivatives Fair Value (1)   (1)   (2)
Derivatives not designated as hedging instruments | Foreign currency derivatives | Other current assets
          
Derivatives disclosures          
Asset Derivatives Fair Value $ 1   $ 1