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Derivatives and Risk Management Activities - Offsetting (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Derivative Asset Positions    
Gross Position - Asset $ 181 $ 280
Netting Adjustment (83) (38)
Cash collateral received (17) (156)
Net Position - Asset 81 86
Derivative Liability Positions    
Gross Position - Liability (294) (110)
Netting Adjustment 83 38
Net Position - Liability (211) (72)
Other current assets    
Derivative Asset Positions    
Net Position - Asset 81 76
Other long-term assets, net    
Derivative Asset Positions    
Net Position - Asset   10
Other current liabilities    
Derivative Liability Positions    
Net Position - Liability (53) (38)
Other long-term liabilities and deferred credits    
Derivative Liability Positions    
Net Position - Liability $ (158) $ (34)