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Risk Management and Hedging Activities - PacifiCorp - Derivative Contract Volumes (Details) - PacifiCorp [Member] - Commodity derivative [Member]
MWh in Millions, Dth in Millions
Mar. 31, 2020
Dth
MWh
Dec. 31, 2019
Dth
MWh
Electricity sales, net    
Notional Amounts of Outstanding Derivative Positions [Line Items]    
Derivative, Nonmonetary Notional Amount | MWh (1) (2)
Natural gas purchases    
Notional Amounts of Outstanding Derivative Positions [Line Items]    
Derivative, Nonmonetary Notional Amount | Dth (129) (129)