Income Taxes - Reconciliation of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
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	$ 43,097	$ 45,086	$ 45,655
Additions for tax positions of the current year	1,473	1,399	3,305
Additions for tax positions of prior years	419	2,069	1,449
Reductions for tax positions of prior years for:
Changes in judgment	661	(3,495)	(2,659)
Settlements with taxing authorities	0	0	0
Lapses of applicable statute of limitations	(1,376)	(1,962)	(2,664)
Total unrecognized tax benefits, end of the year	44,274	43,097	45,086
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	43,097	45,086	45,655
Additions for tax positions of the current year	1,473	1,399	3,305
Additions for tax positions of prior years	419	2,069	1,449
Reductions for tax positions of prior years for:
Changes in judgment	661	(3,495)	(2,659)
Settlements with taxing authorities	0	0	0
Lapses of applicable statute of limitations	(1,376)	(1,962)	(2,664)
Total unrecognized tax benefits, end of the year	$ 44,274	$ 43,097	$ 45,086