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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, 2013
item
Mar. 31, 2012
Dec. 31, 2012
item
Derivatives disclosures      
Asset Derivatives Fair Value $ 191   $ 191
Liability Derivatives Fair Value (169)   (189)
Net (loss) deferred in AOCI (98)    
Net gain expected to be reclassified to earnings in next 12 months 21    
Loss expected to be reclassified to earnings prior to 2016 (2)    
Gain (loss) expected to be reclassified to earnings through 2045 (117)    
Net deferred gain/(loss) recognized in AOCI on derivatives (effective portion) 22 76  
Broker receivable 82   41
Initial margin 70   69
Variation margin paid/(received) 12   (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   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 derivative containing credit-risk related contingent features 0   0
Commodity
      
Derivatives disclosures      
Net deferred gain/(loss) recognized in AOCI on derivatives (effective portion) 3 25  
Interest Rate Contracts
      
Derivatives disclosures      
Net deferred gain/(loss) recognized in AOCI on derivatives (effective portion) 19 51  
Derivatives designated as hedging instruments
      
Derivatives disclosures      
Asset Derivatives Fair Value 68   56
Liability Derivatives Fair Value (74)   (62)
Derivatives designated as hedging instruments | Commodity | Other current assets
      
Derivatives disclosures      
Asset Derivatives Fair Value 55   45
Liability Derivatives Fair Value (48)   (23)
Derivatives designated as hedging instruments | Commodity | Other long-term assets
      
Derivatives disclosures      
Asset Derivatives Fair Value 10   11
Liability Derivatives Fair Value (2)   (1)
Derivatives designated as hedging instruments | Interest Rate Contracts | Other long-term assets
      
Derivatives disclosures      
Asset Derivatives Fair Value 3    
Derivatives designated as hedging instruments | Interest Rate Contracts | Other current liabilities
      
Derivatives disclosures      
Liability Derivatives Fair Value (1)    
Derivatives designated as hedging instruments | Interest Rate Contracts | Other long term liabilities
      
Derivatives disclosures      
Liability Derivatives Fair Value (23)   (38)
Derivatives not designated as hedging instruments
      
Derivatives disclosures      
Asset Derivatives Fair Value 123   135
Liability Derivatives Fair Value (95)   (127)
Derivatives not designated as hedging instruments | Commodity | Other current assets
      
Derivatives disclosures      
Asset Derivatives Fair Value 121   128
Liability Derivatives Fair Value (88)   (115)
Derivatives not designated as hedging instruments | Commodity | Other long-term assets
      
Derivatives disclosures      
Asset Derivatives Fair Value 2   1
Liability Derivatives Fair Value (4)   (3)
Derivatives not designated as hedging instruments | Commodity | Other current liabilities
      
Derivatives disclosures      
Asset Derivatives Fair Value     4
Liability Derivatives Fair Value (1)   (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 $ (1)