Income Taxes - Components of Deferred Income Tax Liability (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
DEFERRED TAX ASSETS
Risk management activities	$ 8,826	$ 677
Regulatory liabilities:
Excess deferred income taxes — Tax Cuts and Jobs Act	295,014	306,915
Asset retirement obligation and removal costs	107,104	174,952
Unamortized investment tax credits	48,035	49,601
Other postretirement benefits	66,893	92,654
Other	62,915	65,815
Operating lease liabilities	184,030	204,890
Pension liabilities	33,674	42,136
Coal reclamation liabilities	44,312	43,165
Renewable energy incentives	19,948	22,646
Credit and loss carryforwards	37,647	57,077
Other	72,605	74,184
Total deferred tax assets	981,003	1,134,712
DEFERRED TAX LIABILITIES
Plant-related	(2,518,164)	(2,570,613)
Risk management activities	(32,648)	(27,276)
Pension and other postretirement assets	(96,845)	(133,624)
Other special use funds	(57,572)	(64,610)
Operating lease right-of-use assets	(184,030)	(204,890)
Regulatory assets:
Allowance for equity funds used during construction	(44,405)	(42,616)
Deferred fuel and purchased power	(114,232)	(96,033)
Pension benefits	(157,629)	(126,010)
Retired power plant costs	(24,397)	(28,389)
Other	(103,023)	(123,902)
Other	(32,479)	(28,611)
Total deferred tax liabilities	(3,365,424)	(3,446,574)
Deferred income taxes — net	(2,384,421)	(2,311,862)
Arizona Public Service Company
DEFERRED TAX ASSETS
Risk management activities	8,826	677
Regulatory liabilities:
Excess deferred income taxes — Tax Cuts and Jobs Act	295,014	306,915
Asset retirement obligation and removal costs	107,104	174,952
Unamortized investment tax credits	48,035	49,601
Other postretirement benefits	66,893	92,654
Other	62,915	65,815
Operating lease liabilities	182,663	204,378
Pension liabilities	30,436	37,814
Coal reclamation liabilities	44,312	43,165
Renewable energy incentives	19,948	22,646
Credit and loss carryforwards	13,654	18,902
Other	72,605	74,184
Total deferred tax assets	952,405	1,091,703
DEFERRED TAX LIABILITIES
Plant-related	(2,518,164)	(2,570,613)
Risk management activities	(32,648)	(27,276)
Pension and other postretirement assets	(96,196)	(132,769)
Other special use funds	(57,572)	(64,610)
Operating lease right-of-use assets	(182,663)	(204,378)
Regulatory assets:
Allowance for equity funds used during construction	(44,405)	(42,616)
Deferred fuel and purchased power	(114,232)	(96,033)
Pension benefits	(157,629)	(126,010)
Retired power plant costs	(24,397)	(28,389)
Other	(103,023)	(123,902)
Other	(7,123)	(6,808)
Total deferred tax liabilities	(3,338,052)	(3,423,404)
Deferred income taxes — net	$ (2,385,647)	$ (2,331,701)