Regulatory Matters - Cost Recovery Mechanisms (Details)																										12 Months Ended
	Dec. 17, 2024 USD ($)	Nov. 27, 2024 $ / kWh	Jul. 31, 2024 USD ($)	Jun. 01, 2024 USD ($) MW	May 01, 2024 $ / kWh	Apr. 19, 2024	Nov. 30, 2023 USD ($) $ / kWh	Oct. 26, 2023 USD ($)	Oct. 25, 2023 USD ($)	Oct. 11, 2023	Jul. 31, 2023 USD ($)	Jul. 01, 2023 USD ($) $ / KWH_Kilowatt_hour	Jun. 01, 2023 USD ($)	May 01, 2023 $ / kWh	Mar. 10, 2023 USD ($)	Feb. 23, 2023 $ / kWh	Feb. 01, 2023 USD ($) $ / kWh	Jul. 12, 2022 USD ($) $ / kWh	Jun. 01, 2022 USD ($)	Feb. 15, 2022 USD ($)	Feb. 01, 2022 $ / kWh	Oct. 01, 2021 $ / kWh	Feb. 15, 2021 USD ($)	Feb. 01, 2020 $ / kWh	Sep. 01, 2017	Dec. 31, 2024 USD ($)	Jul. 01, 2024 USD ($)	Apr. 26, 2024 USD ($)	Oct. 27, 2023 USD ($)	Jun. 30, 2023 USD ($)	May 31, 2023 USD ($)	Nov. 30, 2022 USD ($)	Jul. 01, 2022 USD ($)	Apr. 18, 2022 USD ($)	Dec. 17, 2021 USD ($)	Dec. 09, 2021 USD ($)	Jul. 01, 2021 USD ($)
Arizona Public Service Company
Public Utilities, General Disclosures [Line Items]
Requested equity contributions limit	$ 9,500,000,000																												$ 500,000,000
Annual amount of approved equity infusions								$ 150,000,000
Public utilities, request to permanently modify permitted yearly equity infusions	2.50%					2.50%
Public utilities,equity infusions recommended limit by administrative law judge, percentage	2.50%
Arizona Public Service Company | Damage from Fire, Explosion or Other Hazard
Public Utilities, General Disclosures [Line Items]
Past due balance threshold qualifying for payment extension																																		$ 75
Arizona Renewable Energy Standard and Tariff | ACC | Arizona Public Service Company
Public Utilities, General Disclosures [Line Items]
Plan term																										5 years
Arizona Renewable Energy Standard and Tariff 2018 | ACC | Arizona Public Service Company
Public Utilities, General Disclosures [Line Items]
Amount of proposed budget																											$ 92,700,000			$ 95,100,000			$ 86,200,000			$ 100,500,000	$ 93,100,000
Arizona Renewable Energy Standard and Tariff 2018 | ACC | Arizona Public Service Company | Solar Communities
Public Utilities, General Disclosures [Line Items]
Program term																		3 years
Arizona Renewable Energy Standard and Tariff 2018 | ACC | Arizona Public Service Company | Minimum
Public Utilities, General Disclosures [Line Items]
Authorized spending in capital costs																		$ 20,000,000
Arizona Renewable Energy Standard and Tariff 2018 | ACC | Arizona Public Service Company | Maximum
Public Utilities, General Disclosures [Line Items]
Authorized spending in capital costs																		$ 30,000,000
Demand Side Management Adjustor Charge 2022 | ACC | Arizona Public Service Company
Public Utilities, General Disclosures [Line Items]
Amount of proposed budget																																			$ 78,400,000
Rate matter, increase (decrease) in proposed budget																																			$ 14,000,000
2023 Transportation Electrification Plan | ACC | Arizona Public Service Company
Public Utilities, General Disclosures [Line Items]
Amount of proposed budget																																$ 5,000,000
Demand Side Management Adjustor Charge 2023 | ACC | Arizona Public Service Company
Public Utilities, General Disclosures [Line Items]
Amount of proposed budget																															$ 88,000,000	$ 88,000,000
Demand Side Management Adjustor Charge 2024 | ACC | Arizona Public Service Company
Public Utilities, General Disclosures [Line Items]
Amount of proposed budget							$ 91,500,000
Rate matter, updated budget																												$ 90,900,000
Power Supply Adjustor (PSA) | ACC | Arizona Public Service Company
Public Utilities, General Disclosures [Line Items]
PSA rate (in dollars per kWh) | $ / kWh		0.013977					0.019074									0.019074	0.006				0.007544
Forward component of PSA rate1 (in dollars per kWh) | $ / kWh		(0.000281)					(0.012624)									(0.005527)					0.004842
Historical component of PSA rate1 (in dollars per kWh) | $ / kWh		0.008728					0.013071									0.013071					0.012386
Transition component of PSA rate | $ / kWh		0.005530					0.011530									0.011530
Period to reduce balancing account																24 months
Reporting threshold of balancing account							$ 100,000,000
Overall approved PSA rate1 (in dollars per kWh) | $ / kWh							0.011977
Power Supply Adjustor (PSA) | ACC | Arizona Public Service Company | Cost Recovery Mechanisms
Public Utilities, General Disclosures [Line Items]
Maximum increase decrease in PSA rate (in dollars per kWh) | $ / kWh		0.006																						0.006
PSA rate In prior years1 (in dollars per kWh) | $ / kWh		0.002																			0.004
Environmental Improvement Surcharge | FERC | Arizona Public Service Company
Public Utilities, General Disclosures [Line Items]
Rate matters, increase (decrease) In cost recovery															$ (10,700,000)		$ 14,700,000
Rate matters, increase (decrease) In cost recovery, excess Of annual amount															(7,500,000)		$ 3,300,000
Rate matters, environmental surcharge cap rate1 (in dollars per kWh)															$ 4,000,000
Transmission rates, transmission cost adjustor and other transmission matters | FERC | Arizona Public Service Company
Public Utilities, General Disclosures [Line Items]
Rate matters, increase (decrease) In cost recovery				$ 27,400,000									$ 34,700,000						$ (33,000,000)
Rate matters, increase (decrease) in cost recovery, wholesale customer rates				16,600,000									20,700,000						(6,400,000)
Rate matters, increase (decrease) in cost recovery, retail customer rates				10,800,000									14,000,000						(26,600,000)
Rate matters, increase (decrease) In retail revenue requirements				$ 8,800,000									$ (10,000,000)						$ (2,400,000)
Rate matters, increase in residential and commercial rates (in MW) | MW				3
Rate matters, decrease in commercial rates (in MW) | MW				3
Lost Fixed Cost Recovery Mechanism | Arizona Public Service Company
Public Utilities, General Disclosures [Line Items]
Rate matter cap percentage of retail revenue																										1.00%
Amount of adjustment approved representing prorated sales losses pending approval			$ 49,600,000								$ 68,700,000									$ 59,100,000
Increase (decrease) In amount of adjustment representing prorated sales losses																				$ 32,500,000			$ 11,800,000
Amount of adjustment representing annual recovery			$ 8,000,000								$ 9,600,000
Lost Fixed Cost Recovery Mechanism | ACC
Public Utilities, General Disclosures [Line Items]
Amount of adjustment approved to transfer									$ 27,100,000
Court Resolution Surcharge | ACC | Arizona Public Service Company
Public Utilities, General Disclosures [Line Items]
Court resolution surcharge (in dollars per kWh) | $ / KWH_Kilowatt_hour												0.00175
Lost revenue recovery												$ 59,600,000
Lost revenue recovery collected																										$ 26,200,000
Net Metering | ACC | Arizona Public Service Company
Public Utilities, General Disclosures [Line Items]
Rate matters, cost of service, resource comparison proxy method, maximum annual percentage decrease					10.00%					10.00%				10.00%				10.00%							10.00%
Rate matter, request second-year energy price for exported energy1 (in dollars per kwh) | $ / kWh																		0.0846				0.094
Third-year export energy price (in dollars per kWh) | $ / kWh					0.06857									0.07619
Rate lock period										10 years