Regulatory Matters - Retail Rate Case Filing (Details)	Mar. 31, 2022 MW	Dec. 17, 2021 USD ($)	Oct. 27, 2021 USD ($)	Aug. 02, 2021 USD ($)	Nov. 06, 2020 USD ($)	Oct. 31, 2019 USD ($) $ / kWh MW	Jun. 30, 2019 USD ($)	Aug. 13, 2018 USD ($)	Mar. 27, 2017 USD ($) $ / kWh	Apr. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 04, 2020 USD ($)	Oct. 02, 2020 USD ($)
ACC
Public Utilities, General Disclosures [Line Items]
Revenue increase (decrease)					$ 169,000,000								$ 59,800,000	$ 89,700,000
Average annual customer bill increase (decrease), percent					5.14%								1.82%	2.70%
Recommended return on equity, percentage					10.00%									9.40%
Alternative, percentage														0.30%
Increment of fair value rate, percentage					0.80%									0.00%
Residential Utility Consumer Office
Public Utilities, General Disclosures [Line Items]
Revenue increase (decrease)													$ (50,100,000)	$ (20,800,000)
Average annual customer bill increase (decrease), percent													(1.52%)	(0.63%)
Recommended return on equity, percentage														8.74%
Increment of fair value rate, percentage														0.00%
ACC | APS
Public Utilities, General Disclosures [Line Items]
Proposed annual revenue increase						$ 184,000,000		$ (86,500,000)
Retail Rate Case Filing with Arizona Corporation Commission | ACC | APS
Public Utilities, General Disclosures [Line Items]
Base rate decrease, elimination of tax expense adjustment mechanism						$ 115,000,000
Approximate percentage of increase in average customer bill						5.60%
Approximate percentage of increase in average residential customer bill						5.40%
Rate matter, cost base rate							$ 8,870,000,000
Base fuel rate (in dollars per kWh) | $ / kWh						0.030168
Funding limited income crisis bill program						$ 1,250,000
Commercial customers, market pricing, threshold | MW	280					0.02
Revenue increase (decrease)				$ (111,000,000)
Recommended return on equity, percentage			8.70%	9.16%
Increment of fair value rate, percentage				0.30%
Reduction on equity percentage				0.03%
Effective fair value percentage				4.95%
Net retail base rate, increase									$ 94,600,000
Non-fuel and non-depreciation base rate, increase									87,200,000
Fuel-related base rate decrease									53,600,000
Base rate increase, changes in depreciation schedules									$ 61,000,000
Authorized return on common equity (as a percent)									10.00%
Percentage of debt in capital structure									44.20%
Percentage of common equity in capital structure									55.80%
Rate matter, resource comparison proxy for exported energy (in dollars per kWh) | $ / kWh									0.129
AZ Sun Program Phase 2 | Retail Rate Case Filing with Arizona Corporation Commission | ACC | APS
Public Utilities, General Disclosures [Line Items]
Public utilities, minimum annual renewable energy standard and tariff									$ 10,000,000
Public utilities, maximum annual renewable energy standard and tariff									$ 15,000,000
Coal Community Transition Plan | ACC
Public Utilities, General Disclosures [Line Items]
Amount funded by customers					$ 100,000,000
Amount funded by customers, term					10 years
Amount funded by shareholders					$ 25,000,000							$ 25,000,000
Coal Community Transition Plan | ACC | Navajo Nation, Economic Development Organization
Public Utilities, General Disclosures [Line Items]
Amount funded by shareholders					$ 1,250,000
Amount funded by shareholders, term					5 years
Coal Community Transition Plan | ACC | Navajo Nation, Electrification Projects
Public Utilities, General Disclosures [Line Items]
Amount funded by customers					$ 10,000,000
Amount funded by shareholders					10,000,000
Coal Community Transition Plan | ACC | Navajo Nation, Electrification Projects | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Amount funded by shareholders										$ 500,000
Coal Community Transition Plan | ACC | Navajo Nation, Transmission Revenue Sharing
Public Utilities, General Disclosures [Line Items]
Amount funded by shareholders					2,500,000
Coal Community Transition Plan | ACC | Navajo County Communities
Public Utilities, General Disclosures [Line Items]
Amount funded by customers					$ 12,000,000
Amount funded by customers, term					5 years
Coal Community Transition Plan | ACC | Navajo Nation, Generation Station
Public Utilities, General Disclosures [Line Items]
Amount funded by customers					$ 3,700,000
Coal Community Transition Plan | ACC | Navajo Nation, Hopi Tribe | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Amount recoverable through rates related to the CCT										1,000,000
Coal Community Transition Plan | ACC | Navajo Nation | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Amount recoverable through rates related to the CCT										3,330,000
Coal Community Transition Plan | ACC | Navajo Nation, Hopi Reservation | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Amount recoverable through rates related to the CCT										1,250,000
Coal Community Transition Plan | ACC | Navajo Nation, Navajo Plant
Public Utilities, General Disclosures [Line Items]
Amount funded by customers											$ 900,000
Coal Community Transition Plan | ACC | Navajo County Communities | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Amount recoverable through rates related to the CCT										500,000
Coal Community Transition Plan | ACC | Navajo County Communities, CCT and Economic Development | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Amount funded by shareholders										1,100,000
Coal Community Transition Plan | ACC | Navajo Nation, Hopi Tribe for CCT and Economic Development | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Amount funded by shareholders										$ 1,250,000
Coal Community Transition Plan | Retail Rate Case Filing with Arizona Corporation Commission | ACC | APS | Navajo Nation, Economic Development Organization
Public Utilities, General Disclosures [Line Items]
Disallowance of annual amortization percentage				15.00%
Amount funded by customers				$ 50,000,000
Amount funded by customers, term				10 years
Coal Community Transition Plan | Retail Rate Case Filing with Arizona Corporation Commission | ACC | APS | Navajo County Communities
Public Utilities, General Disclosures [Line Items]
Amount funded by shareholders			$ 500,000	$ 5,000,000
Amount funded by shareholders, term			60 days	5 years
Coal Community Transition Plan | Retail Rate Case Filing with Arizona Corporation Commission | ACC | APS | Navajo Nation, Hopi Tribe
Public Utilities, General Disclosures [Line Items]
Amount not recoverable			$ 215,500,000
Amount funded by shareholders			$ 1,000,000	$ 1,675,000
Amount funded by shareholders, term			60 days
Coal Community Transition Plan | Retail Rate Case Filing with Arizona Corporation Commission | ACC | APS | Navajo Nation
Public Utilities, General Disclosures [Line Items]
Amount funded by shareholders			$ 10,000,000
Amount funded by shareholders, term			3 years
Coal Community Transition Plan | Retail Rate Case Filing with Arizona Corporation Commission | ACC | APS | Navajo Nation, Hopi Reservation
Public Utilities, General Disclosures [Line Items]
Amount funded by shareholders			$ 1,250,000
Coal Community Transition Plan | Retail Rate Case Filing with Arizona Corporation Commission | ACC | APS | Navajo Nation Reservation
Public Utilities, General Disclosures [Line Items]
Revenue increase (decrease)			4,800,000
Amount funded by shareholders			$ 1,250,000
Disallowance of plant investments		$ 215,000,000
Minimum | ACC | APS
Public Utilities, General Disclosures [Line Items]
Annual increase in retail base rates						$ 69,000,000
Minimum | Retail Rate Case Filing with Arizona Corporation Commission | ACC | APS
Public Utilities, General Disclosures [Line Items]
Rate matter, environmental surcharge cap rate (in dollars per kWh) | $ / kWh									0.00016
Maximum | Retail Rate Case Filing with Arizona Corporation Commission | ACC | APS
Public Utilities, General Disclosures [Line Items]
Rate matter, environmental surcharge cap rate (in dollars per kWh) | $ / kWh									0.00050