Risk Management and Hedging Activities - PacifiCorp - Derivative Contract Volumes (Details) - PacifiCorp [Member] - Commodity Contract [Member] MWh in Millions, Dth in Millions	Dec. 31, 2019 Dth MWh	Dec. 31, 2018 Dth MWh
Electricity purchases (sales), net, in megawatt hours [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, Nonmonetary Notional Amount | MWh	2	6
Natural gas purchases (sales), in decatherms [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, Nonmonetary Notional Amount | Dth	129	117