Regulatory Matters - Retail Rate Case Filing (Details)	Oct. 28, 2022 USD ($) $ / kWh	Sep. 23, 2022 MW	Jun. 30, 2022 USD ($)	Mar. 31, 2022 MW	Dec. 17, 2021 USD ($)	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)
ACC | APS | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Total revenue deficiency	$ 772,000,000
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			$ 10,500,000,000							$ 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		140		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
Retail Rate Case Filing with Arizona Corporation Commission | ACC | APS | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Approximate percentage of increase in average residential customer bill	13.60%
Base fuel rate (in dollars per kWh) | $ / kWh	0.038321
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					$ 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
Public Utilities, General Disclosures [Line Items]
Amount recoverable through rates related to the CCT													1,000,000
Coal Community Transition Plan | ACC | Navajo Nation
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
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
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
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
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 | ACC | APS | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Annual increase in retail base rates	$ 460,000,000
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