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Derivatives and Risk Management Activities (Details 5) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Derivatives disclosures      
Asset Derivatives Fair Value $ 191 $ 187  
Liability Derivatives Fair Value (189) (230)  
Net loss deferred in AOCI 120    
Net gain expected to be reclassified to earnings in next 12 months 17    
Loss expected to be reclassified to earnings prior to 2015 (2)    
Net deferred gain/(loss) recognized in AOCI on derivatives (effective portion) 44 (154) (73)
Gain (loss) expected to be reclassified to earnings through 2045 (135)    
Gain (loss) on discontinued cash flow hedge reclassified to Facilities segment revenues during the year   1  
Gain (loss) on discontinued cash flow hedge reclassified to other income/(expense), net during the year   1  
Broker payable   7  
Broker receivable 41    
Initial margin 69 52  
Variation margin returned/(posted) 28 59  
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 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) 56 (18) (79)
Foreign exchange contracts
      
Derivatives disclosures      
Net deferred gain/(loss) recognized in AOCI on derivatives (effective portion)     (2)
Interest Rate Contracts
      
Derivatives disclosures      
Net deferred gain/(loss) recognized in AOCI on derivatives (effective portion) (12) (136) 8
Derivatives designated as hedging instruments
      
Derivatives disclosures      
Asset Derivatives Fair Value 56 94  
Liability Derivatives Fair Value (62) (187)  
Derivatives designated as hedging instruments | Commodity | Other current assets
      
Derivatives disclosures      
Asset Derivatives Fair Value 45 72  
Liability Derivatives Fair Value (23) (47)  
Derivatives designated as hedging instruments | Commodity | Other long-term assets
      
Derivatives disclosures      
Asset Derivatives Fair Value 11 20  
Liability Derivatives Fair Value (1) (2)  
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  
Derivatives designated as hedging instruments | Interest Rate Contracts | Other current liabilities
      
Derivatives disclosures      
Liability Derivatives Fair Value   (24)  
Derivatives designated as hedging instruments | Interest Rate Contracts | Other long term liabilities
      
Derivatives disclosures      
Liability Derivatives Fair Value (38) (114)  
Derivatives not designated as hedging instruments
      
Derivatives disclosures      
Asset Derivatives Fair Value 135 93  
Liability Derivatives Fair Value (127) (43)  
Derivatives not designated as hedging instruments | Commodity | Other current assets
      
Derivatives disclosures      
Asset Derivatives Fair Value 128 87  
Liability Derivatives Fair Value (115) (39)  
Derivatives not designated as hedging instruments | Commodity | Other long-term assets
      
Derivatives disclosures      
Asset Derivatives Fair Value 1 6  
Liability Derivatives Fair Value (3) (3)  
Derivatives not designated as hedging instruments | Commodity | Other current liabilities
      
Derivatives disclosures      
Asset Derivatives Fair Value 4    
Liability Derivatives Fair Value (7) (1)  
Derivatives not designated as hedging instruments | Commodity | Other long term liabilities
      
Derivatives disclosures      
Asset Derivatives Fair Value 2    
Liability Derivatives Fair Value $ (2)