Investments in Nuclear Decommissioning Trusts and Other Special Use Funds - Additional Information (Details) - USD ($) $ in Thousands		12 Months Ended
	Jan. 04, 2021	Dec. 31, 2021	Dec. 31, 2020
Other Benefits
Schedule of Equity Method Investments [Line Items]
Transfer to active union medical account	$ 106,000	$ 105,852	$ 0
Arizona Public Service Company
Schedule of Equity Method Investments [Line Items]
Employee medical claims amount		$ 15,000	$ 14,000
Arizona Public Service Company | Other Benefits
Schedule of Equity Method Investments [Line Items]
Transfer to active union medical account	$ 106,000