Regulatory Matters - Retail Rate Case Filing (Details)	Jul. 26, 2023 USD ($) $ / kWh	Jul. 12, 2023 USD ($) $ / kWh	Jun. 30, 2023 $ / kWh	Jun. 14, 2023 USD ($)	Mar. 06, 2023 USD ($)	Oct. 28, 2022 USD ($) $ / kWh	Jun. 30, 2022 USD ($)	Dec. 17, 2021 USD ($)	Oct. 27, 2021 USD ($)	Aug. 02, 2021 USD ($)	Mar. 27, 2017 USD ($)	Jun. 15, 2023 USD ($)	Jun. 05, 2023	Apr. 30, 2022 USD ($)
ACC
Public Utilities, General Disclosures [Line Items]
Base fuel rate (in dollars per kWh) | $ / kWh			0.004
Revenue increase (decrease)												$ 251,000,000
Alternative revenue increase (decrease)												$ 312,000,000
Recommended return on equity, percentage												9.60%
Increment of fair value rate, percentage												0.00%
Alternative increment of fair value rate percentage												0.0075
Hypothetical capital structure of equity layer percentage													0.46
ACC | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Base fuel rate (in dollars per kWh) | $ / kWh	0.006	0.006
Revenue increase (decrease)	$ 281,900,000	$ 383,100,000
Recommended return on equity, percentage	9.68%	10.25%
Increment of fair value rate, percentage	0.50%	0.50%
ACC | Navajo Nation, Hopi Tribe | Coal Community Transition Plan
Public Utilities, General Disclosures [Line Items]
Amount recoverable through rates related to the CCT														$ 1,000,000
ACC | Navajo Nation | Coal Community Transition Plan
Public Utilities, General Disclosures [Line Items]
Amount recoverable through rates related to the CCT														6,660,000
ACC | Navajo Nation, Hopi Reservation | Coal Community Transition Plan
Public Utilities, General Disclosures [Line Items]
Amount recoverable through rates related to the CCT														1,250,000
ACC | Navajo County Communities | Coal Community Transition Plan
Public Utilities, General Disclosures [Line Items]
Amount recoverable through rates related to the CCT														500,000
ACC | Navajo Nation, Electrification Projects | Coal Community Transition Plan
Public Utilities, General Disclosures [Line Items]
Amount funded by shareholders														1,000,000
ACC | Navajo County Communities, CCT and Economic Development | Coal Community Transition Plan
Public Utilities, General Disclosures [Line Items]
Amount funded by shareholders														1,100,000
ACC | Navajo Nation, Hopi Tribe for CCT and Economic Development | Coal Community Transition Plan
Public Utilities, General Disclosures [Line Items]
Amount funded by shareholders														$ 1,250,000
ACC | APS
Public Utilities, General Disclosures [Line Items]
Total revenue deficiency						$ 772,000,000
Regulatory matters, no of basis penalty point					0.0020				0.0020
Reversal of basis point penalty				0.0020
ACC | APS | Retail Rate Case Filing with Arizona Corporation Commission
Public Utilities, General Disclosures [Line Items]
Approximate percentage of increase in average residential customer bill						13.60%
Rate matter, cost base rate							$ 10,500,000,000
Base fuel rate (in dollars per kWh) | $ / kWh						0.038321
Revenue increase (decrease)										$ (111,000,000)
Recommended return on equity, percentage								8.90%	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
ACC | APS | Retail Rate Case Filing with Arizona Corporation Commission | Navajo Nation, Economic Development Organization | Coal Community Transition Plan
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
ACC | APS | Retail Rate Case Filing with Arizona Corporation Commission | Navajo County Communities | Coal Community Transition Plan
Public Utilities, General Disclosures [Line Items]
Amount funded by shareholders									$ 500,000	$ 5,000,000
Amount funded by shareholders, term									60 days	5 years
ACC | APS | Retail Rate Case Filing with Arizona Corporation Commission | Navajo Nation, Hopi Tribe | Coal Community Transition Plan
Public Utilities, General Disclosures [Line Items]
Amount funded by shareholders									$ 1,000,000	$ 1,675,000
Amount funded by shareholders, term									60 days
Amount not recoverable									$ 215,500,000
ACC | APS | Retail Rate Case Filing with Arizona Corporation Commission | Navajo Nation | Coal Community Transition Plan
Public Utilities, General Disclosures [Line Items]
Amount funded by shareholders									$ 10,000,000
Amount funded by shareholders, term									3 years
ACC | APS | Retail Rate Case Filing with Arizona Corporation Commission | Navajo Nation, Hopi Reservation | Coal Community Transition Plan
Public Utilities, General Disclosures [Line Items]
Amount funded by shareholders									$ 1,250,000
ACC | APS | Retail Rate Case Filing with Arizona Corporation Commission | Navajo Nation Reservation | Coal Community Transition Plan
Public Utilities, General Disclosures [Line Items]
Revenue increase (decrease)									(4,800,000)
Recommended return on equity, percentage				8.70%
Amount funded by shareholders									$ 1,250,000
Disallowance of plant investments					$ 215,500,000			$ 215,500,000
Requested reversal of rate adjustment				$ 215,500,000
Lost revenue recovery				$ 59,600,000
Residential Utility Consumer Office | ACC
Public Utilities, General Disclosures [Line Items]
Revenue increase (decrease)												$ 84,900,000
Recommended return on equity, percentage												8.20%
Increment of fair value rate, percentage												0.00%
Alternate recommended return on equity percentage												0.087
Minimum | ACC | APS
Public Utilities, General Disclosures [Line Items]
Annual increase in retail base rates						$ 460,000,000
Maximum | ACC
Public Utilities, General Disclosures [Line Items]
Increment of fair value rate, percentage			1.00%