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Derivatives and Risk Management Activities - Offsetting (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Derivative Asset Positions    
Gross Position - Asset $ 288 $ 90
Netting adjustment (430) (239)
Cash collateral paid 259 212
Net Position - Asset 117 63
Derivative Liability Positions    
Gross Position - Liability (631) (425)
Netting adjustment 430 239
Net Position - Liability (201) (186)
Other current assets    
Derivative Asset Positions    
Net Position - Asset 62 62
Other long-term assets, net    
Derivative Asset Positions    
Net Position - Asset 55 1
Other current liabilities    
Derivative Liability Positions    
Net Position - Liability (152) (151)
Other long-term liabilities and deferred credits    
Derivative Liability Positions    
Net Position - Liability $ (49) $ (35)