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Derivatives and Risk Management Activities (Details 5) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
contract
Dec. 31, 2012
contract
Dec. 31, 2011
Derivatives disclosures      
Asset Derivatives Fair Value $ 133 $ 191  
Liability Derivatives Fair Value (157) (189)  
Net gain (loss) deferred in AOCI 77    
Net gain (loss) expected to be reclassified to earnings in next 12 months (10)    
Gain (loss) expected to be reclassified to earnings through 2045 (67)    
Net deferred gain/(loss) recognized in AOCI on derivatives (effective portion) 109 44 (154)
Broker receivable 161 41  
Initial margin 85 69  
Variation margin paid/(received) 76 (28)  
Number of outstanding derivatives containing credit-risk related contingent features 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) 37 56 (18)
Interest Rate Contracts
      
Derivatives disclosures      
Net deferred gain/(loss) recognized in AOCI on derivatives (effective portion) 72 (12) (136)
Derivatives designated as hedging instruments
      
Derivatives disclosures      
Asset Derivatives Fair Value 67 56  
Liability Derivatives Fair Value (24) (62)  
Derivatives designated as hedging instruments | Commodity | Other current assets
      
Derivatives disclosures      
Asset Derivatives Fair Value 36 45  
Liability Derivatives Fair Value (24) (23)  
Derivatives designated as hedging instruments | Commodity | Other long-term assets
      
Derivatives disclosures      
Asset Derivatives Fair Value 5 11  
Liability Derivatives Fair Value   (1)  
Derivatives designated as hedging instruments | Interest Rate Contracts | Other long-term assets
      
Derivatives disclosures      
Asset Derivatives Fair Value 26    
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 66 135  
Liability Derivatives Fair Value (133) (127)  
Derivatives not designated as hedging instruments | Commodity | Other current assets
      
Derivatives disclosures      
Asset Derivatives Fair Value 60 128  
Liability Derivatives Fair Value (117) (115)  
Derivatives not designated as hedging instruments | Commodity | Other long-term assets
      
Derivatives disclosures      
Asset Derivatives Fair Value 5 1  
Liability Derivatives Fair Value (6) (3)  
Derivatives not designated as hedging instruments | Commodity | Other current liabilities
      
Derivatives disclosures      
Asset Derivatives Fair Value 1 4  
Liability Derivatives Fair Value (5) (7)  
Derivatives not designated as hedging instruments | Commodity | Other long term liabilities
      
Derivatives disclosures      
Asset Derivatives Fair Value   2  
Liability Derivatives Fair Value (1) (2)  
Derivatives not designated as hedging instruments | Foreign currency derivatives | Other current liabilities
      
Derivatives disclosures      
Liability Derivatives Fair Value $ (4)