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Derivatives and Risk Management Activities (Details 5) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2014
contract
Mar. 31, 2013
Dec. 31, 2013
contract
Derivatives disclosures      
Asset Derivatives Fair Value $ 141   $ 133
Liability Derivatives Fair Value (83)   (157)
Net gain (loss) deferred in AOCI (89)    
Net gain (loss) expected to be reclassified to earnings in next 12 months 1    
Gain (loss) expected to be reclassified to earnings through 2045 (90)    
Net deferred gain/(loss) recognized in AOCI on derivatives (effective portion) (32) 22  
Broker receivable 43   161
Initial margin 65   85
Variation margin posted/(returned) (22)   76
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
      
Derivatives disclosures      
Net deferred gain/(loss) recognized in AOCI on derivatives (effective portion) (12) 3  
Interest Rate Derivatives
      
Derivatives disclosures      
Net deferred gain/(loss) recognized in AOCI on derivatives (effective portion) (20) 19  
Derivatives designated as hedging instruments
      
Derivatives disclosures      
Asset Derivatives Fair Value 68   67
Liability Derivatives Fair Value (13)   (24)
Derivatives designated as hedging instruments | Commodity Derivatives | Other current assets
      
Derivatives disclosures      
Asset Derivatives Fair Value 56   36
Liability Derivatives Fair Value (10)   (24)
Derivatives designated as hedging instruments | Commodity Derivatives | Other long-term assets
      
Derivatives disclosures      
Asset Derivatives Fair Value 4   5
Liability Derivatives Fair Value (1)    
Derivatives designated as hedging instruments | Interest Rate Derivatives | Other long-term assets
      
Derivatives disclosures      
Asset Derivatives Fair Value 8   26
Derivatives designated as hedging instruments | Interest Rate Derivatives | Other current liabilities
      
Derivatives disclosures      
Liability Derivatives Fair Value (1)    
Derivatives designated as hedging instruments | Interest Rate Derivatives | Other long term liabilities
      
Derivatives disclosures      
Liability Derivatives Fair Value (1)    
Derivatives not designated as hedging instruments
      
Derivatives disclosures      
Asset Derivatives Fair Value 73   66
Liability Derivatives Fair Value (70)   (133)
Derivatives not designated as hedging instruments | Commodity Derivatives | Other current assets
      
Derivatives disclosures      
Asset Derivatives Fair Value 71   60
Liability Derivatives Fair Value (64)   (117)
Derivatives not designated as hedging instruments | Commodity Derivatives | Other long-term assets
      
Derivatives disclosures      
Asset Derivatives Fair Value 1   5
Liability Derivatives Fair Value (1)   (6)
Derivatives not designated as hedging instruments | Commodity Derivatives | Other current liabilities
      
Derivatives disclosures      
Asset Derivatives Fair Value 1   1
Liability Derivatives Fair Value (1)   (5)
Derivatives not designated as hedging instruments | Commodity Derivatives | Other long term liabilities
      
Derivatives disclosures      
Liability Derivatives Fair Value (1)   (1)
Derivatives not designated as hedging instruments | Foreign Currency Derivatives | Other current liabilities
      
Derivatives disclosures      
Liability Derivatives Fair Value $ (3)   $ (4)