Commitments And Contingencies - Additional Information (Details) - USD ($)	3 Months Ended		12 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
Commitments And Contingencies Disclosure [Abstract]
Liability protection, per nuclear incident, per site			$ 13,500,000,000
Liability protection period for nuclear incidents subject to change for inflation			5 years
Liability protection per nuclear incidents decreased	$ 13,500,000,000	$ 13,700,000,000		$ 13,800,000,000
Nuclear liability assessment per reactor			$ 138,000,000
Nuclear liability assessment per licensed reactor per year			21,000,000
Contingent liability for coverage, maximum			$ 34,900,000