Commitments and Contingencies - PAC - Hydroelectric (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)
Hydroelectric [Line Items]
Capital expenditures required by hydroelectric licenses, period	10 years
PAC
Hydroelectric [Line Items]
Capital expenditures required by hydroelectric licenses	$ 193
Klamath Hydroelectric System | PAC
Hydroelectric [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