Commitments and Contingencies - Commitments (Details) $ in Millions	6 Months Ended
	Jun. 30, 2018 USD ($)
MidAmerican Energy Company [Member]
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Operating Leases, Future Minimum Payments Due	$ 283
PacifiCorp [Member]
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Operating Leases, Future Minimum Payments Due	613
PacifiCorp [Member] | Klamath Hydroelectric System [Member]
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Dam removal cost limit	200
PacifiCorp [Member] | Klamath Hydroelectric System [Member] | OREGON
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Dam removal cost limit	184
PacifiCorp [Member] | Klamath Hydroelectric System [Member] | CALIFORNIA
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Dam removal cost limit	16
Additional dam removal costs, California bond measure	$ 250