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Risk Management and Hedging Activities - PacifiCorp - Collateral and Contingent Features (Details) - Commodity derivative [Member] - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Derivative [Line Items]    
Derivative, net liability position, aggregate fair value $ (194) $ (190)
Collateral already posted, aggregate fair value 73 69
Additional collateral, aggregate fair value 112 110
PacifiCorp [Member]    
Derivative [Line Items]    
Derivative, net liability position, aggregate fair value 102 97
Collateral already posted, aggregate fair value 73 69
Additional collateral, aggregate fair value $ 26 $ 22