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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, 2012
Mar. 31, 2011
Dec. 31, 2011
Derivatives disclosures      
Asset Derivatives Fair Value $ 146   $ 187
Liability Derivatives Fair Value (169)   (230)
Net loss deferred in AOCI (78)    
Net gain expected to be reclassified to earnings in next 12 months 2    
Gain expected to be reclassified to earnings prior to 2015 4    
Net deferred gain/(loss) recognized in AOCI on derivatives (effective portion) 76 (144)  
Gain (loss) expected to be reclassified to earnings through 2045 (84)    
Broker receivable 49    
Broker payable     7
Initial margin 74   52
Variation margin returned/(posted) 25   59
Commodity
      
Derivatives disclosures      
Net deferred gain/(loss) recognized in AOCI on derivatives (effective portion) 25 (145)  
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) 51 2  
Derivatives designated as hedging instruments
      
Derivatives disclosures      
Asset Derivatives Fair Value 101   94
Liability Derivatives Fair Value (124)   (187)
Derivatives designated as hedging instruments | Commodity | Other current assets
      
Derivatives disclosures      
Asset Derivatives Fair Value 87   72
Liability Derivatives Fair Value (54)   (47)
Derivatives designated as hedging instruments | Commodity | Other long-term assets
      
Derivatives disclosures      
Asset Derivatives Fair Value 7   20
Liability Derivatives Fair Value (1)   (2)
Derivatives designated as hedging instruments | Commodity | Other long-term liabilities
      
Derivatives disclosures      
Asset Derivatives Fair Value 3    
Liability Derivatives Fair Value (3)    
Derivatives designated as hedging instruments | Foreign exchange contracts | Other current assets
      
Derivatives disclosures      
Asset Derivatives Fair Value 1   1
Derivatives designated as hedging instruments | Interest Rate Contracts | Other current assets
      
Derivatives disclosures      
Asset Derivatives Fair Value 1   1
Derivatives designated as hedging instruments | Interest Rate Contracts | Other long-term assets
      
Derivatives disclosures      
Asset Derivatives Fair Value 2    
Derivatives designated as hedging instruments | Interest Rate Contracts | Other current liabilities
      
Derivatives disclosures      
Liability Derivatives Fair Value (1)   (24)
Derivatives designated as hedging instruments | Interest Rate Contracts | Other long-term liabilities
      
Derivatives disclosures      
Liability Derivatives Fair Value (65)   (114)
Derivatives not designated as hedging instruments
      
Derivatives disclosures      
Asset Derivatives Fair Value 45   93
Liability Derivatives Fair Value (45)   (43)
Derivatives not designated as hedging instruments | Commodity | Other current assets
      
Derivatives disclosures      
Asset Derivatives Fair Value 44   87
Liability Derivatives Fair Value (39)   (39)
Derivatives not designated as hedging instruments | Commodity | Other long-term assets
      
Derivatives disclosures      
Asset Derivatives Fair Value     6
Liability Derivatives Fair Value (6)   (3)
Derivatives not designated as hedging instruments | Commodity | Other current liabilities
      
Derivatives disclosures      
Liability Derivatives Fair Value     (1)
Derivatives not designated as hedging instruments | Commodity | Other long-term liabilities
      
Derivatives disclosures      
Asset Derivatives Fair Value $ 1