Commitments and Contingencies - Narrative (Details) naturalGasProducer in Thousands, a in Millions, $ in Millions	1 Months Ended	12 Months Ended
	Sep. 30, 2020 USD ($) a naturalGasProducer	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Loss Contingencies [Line Items]
Capital expenditures required by hydroelectric licenses, period		10 years
MidAmerican Funding
Loss Contingencies [Line Items]
Coal transportation costs, railroad		$ 76	$ 90	$ 123
PAC
Loss Contingencies [Line Items]
Capital expenditures required by hydroelectric licenses		193
PAC | Klamath Hydroelectric System
Loss Contingencies [Line Items]
Dam removal cost limit		200
Additional dam removal costs, California bond measure		250
Additional contingency funding		45
Hydroelectric dam removal cost funding		450
Klamath relicensing and settlement costs		14
PAC | 2020 Wildfires
Loss Contingencies [Line Items]
Number of acres burned | a	0.5
Number of structures destroyed | naturalGasProducer	2
Fire suppression costs	$ 150
Estimate of possible loss		$ 136