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Derivatives and Risk Management Activities - Offsetting (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Derivative Asset Positions    
Gross Position - Asset $ 130 $ 108
Netting adjustment (81) (350)
Cash collateral paid 12 410
Net Position - Asset 61 168
Derivative Liability Positions    
Gross Position - Liability (168) (481)
Netting adjustment 81 350
Net Position - Liability (87) (131)
Other current assets    
Derivative Asset Positions    
Net Position - Asset 55 167
Other long-term assets, net    
Derivative Asset Positions    
Net Position - Asset 6 1
Other current liabilities    
Derivative Liability Positions    
Net Position - Liability (38) (40)
Other long-term liabilities and deferred credits    
Derivative Liability Positions    
Net Position - Liability $ (49) $ (91)