Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Changes in accumulated other comprehensive income (loss) by component
Beginning balance	$ 6,021,460	$ 5,752,793
Ending balance	6,159,876	6,021,460
Pension and Other Postretirement Benefits
Changes in accumulated other comprehensive income (loss) by component
Beginning balance	(53,885)	(60,725)
OCI (loss) before reclassifications	17,550	2,439
Amounts reclassified from accumulated other comprehensive loss	4,003	4,401
Ending balance	(32,332)	(53,885)
Derivative Instruments
Changes in accumulated other comprehensive income (loss) by component
Beginning balance	(976)	(2,071)
OCI (loss) before reclassifications	1,873	1,077
Amounts reclassified from accumulated other comprehensive loss	0	18
Ending balance	897	(976)
Accumulated Other Comprehensive Income (Loss)
Changes in accumulated other comprehensive income (loss) by component
Beginning balance	(54,861)	(62,796)
OCI (loss) before reclassifications	19,423	3,516
Amounts reclassified from accumulated other comprehensive loss	4,003	4,419
Ending balance	(31,435)	(54,861)
Arizona Public Service Company
Changes in accumulated other comprehensive income (loss) by component
Beginning balance	6,750,473	6,345,185
Ending balance	7,052,955	6,750,473
Arizona Public Service Company | Pension and Other Postretirement Benefits
Changes in accumulated other comprehensive income (loss) by component
Beginning balance	(34,880)	(40,918)
OCI (loss) before reclassifications	15,646	2,043
Amounts reclassified from accumulated other comprehensive loss	3,638	3,995
Ending balance	(15,596)	(34,880)
Arizona Public Service Company | Derivative Instruments
Changes in accumulated other comprehensive income (loss) by component
Beginning balance	0	0
OCI (loss) before reclassifications	0	(18)
Amounts reclassified from accumulated other comprehensive loss	0	18
Ending balance	0	0
Arizona Public Service Company | Accumulated Other Comprehensive Income (Loss)
Changes in accumulated other comprehensive income (loss) by component
Beginning balance	(34,880)	(40,918)
OCI (loss) before reclassifications	15,646	2,025
Amounts reclassified from accumulated other comprehensive loss	3,638	4,013
Ending balance	$ (15,596)	$ (34,880)