Commitments and Contingencies - Commitments (Details) - PacifiCorp [Member] - Klamath Hydroelectric System [Member] $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($)
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Dam removal cost limit	$ 200
Additional dam removal costs, California bond measure	250
Hydroelectric Dam Removal Cost, Additional Contingency Funding	45
Hydroelectric Dam Removal Cost, Total Funding	$ 450