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Derivatives and Risk Management Activities (Details 6) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Derivative Asset Positions    
Gross Position - Asset $ 141 $ 133
Netting Adjustment (77) (148)
Cash collateral paid 43 161
Net Position - Asset 107 146
Derivative Liability Positions    
Gross Position - Liability (83) (157)
Netting Adjustment 77 148
Net Position - Liability (6) (9)
Other current assets
    
Derivative Asset Positions    
Net Position - Asset 96 116
Other long-term assets
    
Derivative Asset Positions    
Net Position - Asset 11 30
Other current liabilities
    
Derivative Liability Positions    
Net Position - Liability (4) (8)
Other long term liabilities
    
Derivative Liability Positions    
Net Position - Liability $ (2) $ (1)