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Risk Management and Hedging Activities - PacifiCorp - Collateral and Contingent Features (Details) - PacifiCorp [Member] - Commodity derivative [Member] - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Derivative [Line Items]    
Derivative, net liability position, aggregate fair value $ 92 $ 113
Collateral already posted, aggregate fair value 54 61
Additional collateral, aggregate fair value $ 31 $ 35