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Derivatives and Risk Management Activities (Details 5) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
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Jun. 30, 2012
Jun. 30, 2013
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Jun. 30, 2012
Dec. 31, 2012
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Derivatives disclosures          
Asset Derivatives Fair Value $ 209   $ 209   $ 191
Liability Derivatives Fair Value (129)   (129)   (189)
Net (loss) deferred in AOCI (74)   (74)    
Net gain expected to be reclassified to earnings in next 12 months     14    
Gain expected to be reclassified to earnings prior to 2016     1    
Gain (loss) expected to be reclassified to earnings through 2045     (89)    
Net deferred gain/(loss) recognized in AOCI on derivatives (effective portion) 35 (104) 62 (28)  
Broker receivable 70   70   41
Initial margin 78   78   69
Variation margin paid/(received)     (8)   (28)
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    
Number of outstanding derivatives containing credit-risk related contingent features 0   0   0
Commodity
          
Derivatives disclosures          
Net deferred gain/(loss) recognized in AOCI on derivatives (effective portion) 3 (25) 11    
Interest Rate Contracts
          
Derivatives disclosures          
Net deferred gain/(loss) recognized in AOCI on derivatives (effective portion) 32 (79) 51 (28)  
Derivatives designated as hedging instruments
          
Derivatives disclosures          
Asset Derivatives Fair Value 67   67   56
Liability Derivatives Fair Value (24)   (24)   (62)
Derivatives designated as hedging instruments | Commodity | Other current assets
          
Derivatives disclosures          
Asset Derivatives Fair Value 40   40   45
Liability Derivatives Fair Value (14)   (14)   (23)
Derivatives designated as hedging instruments | Commodity | Other long-term assets
          
Derivatives disclosures          
Asset Derivatives Fair Value 9   9   11
Liability Derivatives Fair Value (4)   (4)   (1)
Derivatives designated as hedging instruments | Interest Rate Contracts | Other current assets
          
Derivatives disclosures          
Asset Derivatives Fair Value 8   8    
Liability Derivatives Fair Value (3)   (3)    
Derivatives designated as hedging instruments | Interest Rate Contracts | Other long-term assets
          
Derivatives disclosures          
Asset Derivatives Fair Value 10   10    
Liability Derivatives Fair Value (1)   (1)    
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 (1)   (1)   (38)
Derivatives not designated as hedging instruments
          
Derivatives disclosures          
Asset Derivatives Fair Value 142   142   135
Liability Derivatives Fair Value (105)   (105)   (127)
Derivatives not designated as hedging instruments | Commodity | Other current assets
          
Derivatives disclosures          
Asset Derivatives Fair Value 131   131   128
Liability Derivatives Fair Value (92)   (92)   (115)
Derivatives not designated as hedging instruments | Commodity | Other long-term assets
          
Derivatives disclosures          
Asset Derivatives Fair Value 9   9   1
Liability Derivatives Fair Value (2)   (2)   (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 1   1   2
Liability Derivatives Fair Value (2)   (2)   (2)
Derivatives not designated as hedging instruments | Foreign currency derivatives | Other current liabilities
          
Derivatives disclosures          
Liability Derivatives Fair Value $ (5)   $ (5)