Regulatory Matters - Retail Rate Case Filing (Details) $ in Thousands	Feb. 22, 2024 USD ($)	Jan. 25, 2024 USD ($) $ / MWh	Jun. 14, 2023 USD ($)	Dec. 17, 2021 USD ($)	Nov. 02, 2021 USD ($)	Mar. 06, 2023
Public Utilities, General Disclosures [Line Items]
Revenue increase (decrease)	$ 491,700	$ 523,100
ACC
Public Utilities, General Disclosures [Line Items]
Recommended return on equity, percentage	9.55%	9.55%
Increment of fair value rate, percentage	0.25%	0.25%
ACC | Coal Community Transition Plan | Navajo Nation, Hopi Tribe
Public Utilities, General Disclosures [Line Items]
Regulatory matters, amounts recoverable by rates					$ 1,000
ACC | Coal Community Transition Plan | Navajo Nation
Public Utilities, General Disclosures [Line Items]
Regulatory matters, amounts recoverable by rates					10,000
ACC | Coal Community Transition Plan | Navajo Nation, Hopi Reservation
Public Utilities, General Disclosures [Line Items]
Regulatory matters, amounts recoverable by rates					1,250
ACC | Coal Community Transition Plan | Navajo County Communities
Public Utilities, General Disclosures [Line Items]
Regulatory matters, amounts recoverable by rates					500
ACC | Coal Community Transition Plan | Navajo Nation, Electrification Projects
Public Utilities, General Disclosures [Line Items]
Amount funded by shareholders					1,500
ACC | Coal Community Transition Plan | Navajo County Communities, CCT and Economic Development
Public Utilities, General Disclosures [Line Items]
Amount funded by shareholders					1,100
ACC | Coal Community Transition Plan | Navajo Nation, Hopi Tribe for CCT and Economic Development
Public Utilities, General Disclosures [Line Items]
Amount funded by shareholders					$ 1,250
ACC | Arizona Public Service Company
Public Utilities, General Disclosures [Line Items]
Regulatory matters, no of basis penalty point					0.0020	0.0020
Reversal of basis point penalty			0.0020
ACC | Arizona Public Service Company | Retail Rate Case Filing with Arizona Corporation Commission
Public Utilities, General Disclosures [Line Items]
Recommended return on equity, percentage				8.90%	8.70%
Effective fair value percentage	4.39%	4.36%
Prepaid pension asset rate (in percent)		5.00%
Pension and otherpost retirement and post employment benefit plans (in percent)		5.35%
Retention of REAC		$ 1,900
Transfer to LFCR		$ 27,100
Base fuel rate (in dollars per kWh) | $ / MWh		0.006
Increases in annual revenue	$ 253,400
Increase to the typical residential customer’s bill (in percent)	8.00%
ACC | Arizona Public Service Company | Retail Rate Case Filing with Arizona Corporation Commission | Coal Community Transition Plan | Navajo Nation, Hopi Tribe
Public Utilities, General Disclosures [Line Items]
Amount not recoverable					$ 215,500
Amount funded by shareholders					$ 1,000
Amount funded by shareholders, term					60 days
ACC | Arizona Public Service Company | Retail Rate Case Filing with Arizona Corporation Commission | Coal Community Transition Plan | Navajo Nation
Public Utilities, General Disclosures [Line Items]
Amount funded by shareholders					$ 10,000
Amount funded by shareholders, term					3 years
ACC | Arizona Public Service Company | Retail Rate Case Filing with Arizona Corporation Commission | Coal Community Transition Plan | Navajo County Communities, Cholla Power Plant Closure
Public Utilities, General Disclosures [Line Items]
Amount funded by shareholders					$ 500
Amount funded by shareholders, term					60 days
ACC | Arizona Public Service Company | Retail Rate Case Filing with Arizona Corporation Commission | Coal Community Transition Plan | Navajo Nation, Hopi Reservation
Public Utilities, General Disclosures [Line Items]
Amount funded by shareholders					$ 1,250
ACC | Arizona Public Service Company | Retail Rate Case Filing with Arizona Corporation Commission | Coal Community Transition Plan | Navajo Nation Reservation
Public Utilities, General Disclosures [Line Items]
Revenue increase (decrease)					$ (4,800)
Recommended return on equity, percentage			8.70%
Disallowance of plant investments				$ 215,500
Requested reversal of rate adjustment			$ 215,500
Lost revenue recovery			$ 59,600