Investments in Nuclear Decommissioning Trusts and Other Special Use Funds (Details) - Arizona Public Service Company - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Nuclear decommissioning trust fund assets
Fair Value	$ 1,420,641	$ 1,653,167
Total Unrealized Gains	337,994	475,670
Total Unrealized Losses	(69,091)	(4,063)
Amortized cost	927,000	972,000
Realized gains and losses and proceeds from the sale of securities by the nuclear decommissioning trust funds
Realized gains	9,437	134,659	$ 12,370
Realized losses	(40,239)	(8,438)	(5,568)
Proceeds from the sale of securities	1,207,197	1,720,966	819,519
Nuclear Decommissioning Trusts
Nuclear decommissioning trust fund assets
Fair Value	1,073,410	1,294,757
Realized gains and losses and proceeds from the sale of securities by the nuclear decommissioning trust funds
Realized gains	9,017	134,610	12,194
Realized losses	(40,239)	(8,431)	(5,553)
Proceeds from the sale of securities	979,639	1,457,305	675,035
Other Special Use Funds
Nuclear decommissioning trust fund assets
Fair Value	347,231	358,410
Realized gains and losses and proceeds from the sale of securities by the nuclear decommissioning trust funds
Realized gains	420	49	176
Realized losses	0	(7)	(15)
Proceeds from the sale of securities	227,558	263,661	$ 144,484
Equity securities
Nuclear decommissioning trust fund assets
Equity securities	554,214	687,882
Total Unrealized Gains	334,817	451,387
Total Unrealized Losses	(267)	0
Equity securities | Nuclear Decommissioning Trusts
Nuclear decommissioning trust fund assets
Equity securities	487,240	640,312
Equity securities | Other Special Use Funds
Nuclear decommissioning trust fund assets
Equity securities	66,974	47,570
Available for sale-fixed income securities
Nuclear decommissioning trust fund assets
Fair Value	861,637	992,131
Total Unrealized Gains	3,177	24,283
Total Unrealized Losses	(68,795)	(4,063)
Fair value of fixed income securities, summarized by contractual maturities
Less than one year	97,496
1 year – 5 years	362,002
5 years – 10 years	129,171
Greater than 10 years	272,968
Total	861,637
Available for sale-fixed income securities | Nuclear Decommissioning Trusts
Nuclear decommissioning trust fund assets
Fair Value	582,343	682,227
Fair value of fixed income securities, summarized by contractual maturities
Less than one year	9,422
1 year – 5 years	181,640
5 years – 10 years	122,340
Greater than 10 years	268,941
Total	582,343
Available for sale-fixed income securities | Other Special Use Funds
Nuclear decommissioning trust fund assets
Fair Value	279,294	309,904
Available for sale-fixed income securities | Coal Reclamation Escrow Account
Fair value of fixed income securities, summarized by contractual maturities
Less than one year	49,917
1 year – 5 years	36,484
5 years – 10 years	0
Greater than 10 years	4,027
Total	90,428
Available for sale-fixed income securities | Active Union Employee Medical Account
Fair value of fixed income securities, summarized by contractual maturities
Less than one year	38,157
1 year – 5 years	143,878
5 years – 10 years	6,831
Greater than 10 years	0
Total	188,866
Other
Nuclear decommissioning trust fund assets
Fair Value	4,790	(26,846)
Total Unrealized Gains	0	0
Total Unrealized Losses	(29)	0
Other | Nuclear Decommissioning Trusts
Nuclear decommissioning trust fund assets
Fair Value	3,827	(27,782)
Other | Other Special Use Funds
Nuclear decommissioning trust fund assets
Fair Value	$ 963	$ 936