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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, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Derivatives disclosures          
Asset Derivatives Fair Value $ 384   $ 384   $ 187
Liability Derivatives Fair Value (306)   (306)   (230)
Net loss deferred in AOCI (124)   (124)    
Net gain expected to be reclassified to earnings in next 12 months     26    
Gain expected to be reclassified to earnings prior to 2015     9    
Net deferred gain/(loss) recognized in AOCI on derivatives (effective portion) (104) 52 (28) (92)  
Gain (loss) expected to be reclassified to earnings through 2045     (159)    
Gain (loss) on discontinued cash flow hedge reclassified to Facilities segment revenues during the year   1   1  
Broker payable 137   137   7
Initial margin 59   59   52
Variation margin returned/(posted)     196   59
Commodity
          
Derivatives disclosures          
Net deferred gain/(loss) recognized in AOCI on derivatives (effective portion) (25) 48   (97)  
Foreign exchange contracts
          
Derivatives disclosures          
Net deferred gain/(loss) recognized in AOCI on derivatives (effective portion)       (1)  
Interest Rate Contracts
          
Derivatives disclosures          
Net deferred gain/(loss) recognized in AOCI on derivatives (effective portion) (79) 4 (28) 6  
Derivatives designated as hedging instruments
          
Derivatives disclosures          
Asset Derivatives Fair Value 113   113   94
Liability Derivatives Fair Value (198)   (198)   (187)
Derivatives designated as hedging instruments | Commodity | Other current assets
          
Derivatives disclosures          
Asset Derivatives Fair Value 97   97   72
Liability Derivatives Fair Value (48)   (48)   (47)
Derivatives designated as hedging instruments | Commodity | Other long-term assets
          
Derivatives disclosures          
Asset Derivatives Fair Value 15   15   20
Liability Derivatives Fair Value (6)   (6)   (2)
Derivatives designated as hedging instruments | Commodity | Other current liabilities
          
Derivatives disclosures          
Liability Derivatives Fair Value (1)   (1)    
Derivatives designated as hedging instruments | Foreign exchange contracts | Other current assets
          
Derivatives disclosures          
Asset Derivatives Fair Value         1
Derivatives designated as hedging instruments | Interest Rate Contracts | Other current assets
          
Derivatives disclosures          
Asset Derivatives Fair Value 1   1   1
Derivatives designated as hedging instruments | Interest Rate Contracts | Other current liabilities
          
Derivatives disclosures          
Liability Derivatives Fair Value (87)   (87)   (24)
Derivatives designated as hedging instruments | Interest Rate Contracts | Other long term liabilities
          
Derivatives disclosures          
Liability Derivatives Fair Value (56)   (56)   (114)
Derivatives not designated as hedging instruments
          
Derivatives disclosures          
Asset Derivatives Fair Value 271   271   93
Liability Derivatives Fair Value (108)   (108)   (43)
Derivatives not designated as hedging instruments | Commodity | Other current assets
          
Derivatives disclosures          
Asset Derivatives Fair Value 264   264   87
Liability Derivatives Fair Value (102)   (102)   (39)
Derivatives not designated as hedging instruments | Commodity | Other long-term assets
          
Derivatives disclosures          
Asset Derivatives Fair Value 7   7   6
Liability Derivatives Fair Value (5)   (5)   (3)
Derivatives not designated as hedging instruments | Commodity | Other current liabilities
          
Derivatives disclosures          
Liability Derivatives Fair Value $ (1)   $ (1)   $ (1)