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Derivatives and Risk Management Activities (Details 6) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Derivative Asset Positions    
Gross Position - Asset $ 209 $ 191
Netting Adjustment (118) (148)
Cash Collateral Paid/(Received) 70 41
Net Position - Asset 161 84
Derivative Liability Positions    
Gross Position - Liability (129) (189)
Netting Adjustment 118 148
Net Position - Liability (11) (41)
Other current assets
    
Derivative Asset Positions    
Net Position - Asset 140 76
Other long-term assets
    
Derivative Asset Positions    
Net Position - Asset 21 8
Other current liabilities
    
Derivative Liability Positions    
Net Position - Liability (9) (3)
Other long term liabilities
    
Derivative Liability Positions    
Net Position - Liability $ (2) $ (38)