Investments in Nuclear Decommissioning Trusts and Other Special Use Funds (Details) - Arizona Public Service Company - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Nuclear decommissioning trust fund assets
Fair Value	$ 1,653,167	$ 1,392,944
Total Unrealized Gains	475,670	468,247
Total Unrealized Losses	(4,063)	(398)
Amortized cost	972,000	687,000
Realized gains and losses and proceeds from the sale of securities by the nuclear decommissioning trust funds
Realized gains	134,659	12,370	$ 11,132
Realized losses	(8,438)	(5,568)	(6,972)
Proceeds from the sale of securities	1,720,966	819,519	719,034
Equity securities
Nuclear decommissioning trust fund assets
Fair Value	687,882	677,188
Total Unrealized Gains	451,387	421,666
Total Unrealized Losses	0	0
Available for sale-fixed income securities
Nuclear decommissioning trust fund assets
Fair Value	992,131	733,080
Total Unrealized Gains	24,283	46,581
Total Unrealized Losses	(4,063)	(398)
Fair value of fixed income securities, summarized by contractual maturities
Less than one year	108,792
1 year – 5 years	396,141
5 years – 10 years	178,823
Greater than 10 years	308,375
Total	992,131
Other
Nuclear decommissioning trust fund assets
Fair Value	(26,846)	(17,324)
Total Unrealized Gains	0	0
Total Unrealized Losses	0	0
Nuclear Decommissioning Trust
Nuclear decommissioning trust fund assets
Fair Value	1,294,757	1,138,435
Realized gains and losses and proceeds from the sale of securities by the nuclear decommissioning trust funds
Realized gains	134,610	12,194	11,024
Realized losses	(8,431)	(5,553)	(6,972)
Proceeds from the sale of securities	1,457,305	675,035	473,806
Nuclear Decommissioning Trust | Equity securities
Nuclear decommissioning trust fund assets
Fair Value	640,312	639,851
Nuclear Decommissioning Trust | Available for sale-fixed income securities
Nuclear decommissioning trust fund assets
Fair Value	682,227	516,412
Fair value of fixed income securities, summarized by contractual maturities
Less than one year	31,070
1 year – 5 years	195,975
5 years – 10 years	155,202
Greater than 10 years	299,980
Total	682,227
Nuclear Decommissioning Trust | Other
Nuclear decommissioning trust fund assets
Fair Value	(27,782)	(17,828)
Other Special Use Funds
Nuclear decommissioning trust fund assets
Fair Value	358,410	254,509
Realized gains and losses and proceeds from the sale of securities by the nuclear decommissioning trust funds
Realized gains	49	176	108
Realized losses	(7)	(15)	0
Proceeds from the sale of securities	263,661	144,484	$ 245,228
Other Special Use Funds | Equity securities
Nuclear decommissioning trust fund assets
Fair Value	47,570	37,337
Other Special Use Funds | Available for sale-fixed income securities
Nuclear decommissioning trust fund assets
Fair Value	309,904	216,668
Other Special Use Funds | Other
Nuclear decommissioning trust fund assets
Fair Value	936	$ 504
Coal Reclamation Escrow Account | Available for sale-fixed income securities
Fair value of fixed income securities, summarized by contractual maturities
Less than one year	36,852
1 year – 5 years	41,931
5 years – 10 years	1,775
Greater than 10 years	8,395
Total	88,953
Active Union Employee Medical Account | Available for sale-fixed income securities
Fair value of fixed income securities, summarized by contractual maturities
Less than one year	40,870
1 year – 5 years	158,235
5 years – 10 years	21,846
Greater than 10 years	0
Total	$ 220,951