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Derivatives and Risk Management Activities (Details 6) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Derivative Asset Positions    
Gross Position - Asset $ 191 $ 191
Netting Adjustment (142) (148)
Cash Collateral Paid/(Received) 82 41
Net Position - Asset 131 84
Derivative Liabiity Positions    
Gross Position - Liability (169) (189)
Netting Adjustment 142 148
Net Position - Liability (27) (41)
Other current assets
    
Derivative Asset Positions    
Net Position - Asset 122 76
Other long-term assets
    
Derivative Asset Positions    
Net Position - Asset 9 8
Other current liabilities
    
Derivative Liabiity Positions    
Net Position - Liability (3) (3)
Other long term liabilities
    
Derivative Liabiity Positions    
Net Position - Liability $ (24) $ (38)