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Derivatives and Risk Management Activities - Offsetting (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Derivative Asset Positions    
Gross Position - Asset $ 82 $ 280
Netting adjustment (123) (38)
Cash collateral paid 142  
Cash collateral received   (156)
Net Position - Asset 101 86
Derivative Liability Positions    
Gross Position - Liability (344) (110)
Netting adjustment 123 38
Net Position - Liability (221) (72)
Other current assets    
Derivative Asset Positions    
Net Position - Asset 101 76
Other long-term assets, net    
Derivative Asset Positions    
Net Position - Asset   10
Other current liabilities    
Derivative Liability Positions    
Net Position - Liability (85) (38)
Other long-term liabilities and deferred credits    
Derivative Liability Positions    
Net Position - Liability $ (136) $ (34)