Income Taxes - Reconciliation of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Tabular reconciliation of the total amounts of unrecognized tax benefits, excluding interest and penalties, at the beginning and end of the year
Total unrecognized tax benefits, beginning of the year	$ 45,655	$ 43,435	$ 40,731
Additions for tax positions of the current year	3,305	3,418	3,373
Additions for tax positions of prior years	1,449	1,431	1,843
Reductions for tax positions of prior years for:
Changes in judgment	(2,659)	(1,965)	(2,078)
Settlements with taxing authorities	0	0	0
Lapses of applicable statute of limitations	(2,664)	(664)	(434)
Total unrecognized tax benefits, end of the year	45,086	45,655	43,435
Arizona Public Service Company
Tabular reconciliation of the total amounts of unrecognized tax benefits, excluding interest and penalties, at the beginning and end of the year
Total unrecognized tax benefits, beginning of the year	45,655	43,435	40,731
Additions for tax positions of the current year	3,305	3,418	3,373
Additions for tax positions of prior years	1,449	1,431	1,843
Reductions for tax positions of prior years for:
Changes in judgment	(2,659)	(1,965)	(2,078)
Settlements with taxing authorities	0	0	0
Lapses of applicable statute of limitations	(2,664)	(664)	(434)
Total unrecognized tax benefits, end of the year	$ 45,086	$ 45,655	$ 43,435