Regulatory Matters - Cost Recovery Mechanisms (Details)																						6 Months Ended	12 Months Ended
	Feb. 01, 2024 USD ($)	Oct. 11, 2023	Jul. 31, 2023 USD ($)	Jul. 01, 2023 USD ($) $ / KWH_Kilowatt_hour	Jun. 14, 2023 USD ($)	May 01, 2023 $ / kWh	Mar. 10, 2023 USD ($)	Feb. 23, 2023 USD ($) $ / kWh	Feb. 01, 2023 USD ($) $ / kWh	Jan. 06, 2023 USD ($)	Sep. 23, 2022 MW	Jul. 12, 2022 USD ($) $ / kWh	Jun. 01, 2022 USD ($)	Feb. 15, 2022 USD ($)	Feb. 01, 2022 USD ($) $ / kWh $ / KWH_Kilowatt_hour	Oct. 01, 2021 $ / kWh	Jun. 01, 2021 USD ($)	Feb. 15, 2021 USD ($)	Feb. 01, 2020 $ / kWh	Oct. 31, 2019 $ / KWH_Kilowatt_hour	Sep. 01, 2017	Jun. 30, 2021 program MW	Dec. 31, 2023 USD ($) storage	Dec. 31, 2022 USD ($) storage	Dec. 31, 2021 USD ($) storage	Dec. 31, 2017 $ / kWh	Dec. 31, 2017 $ / KWH_Kilowatt_hour	Nov. 30, 2023 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 ($)	Jul. 01, 2021 USD ($)
Change in regulatory asset
Deferred fuel and purchased power costs — current period																							$ 549,877,000	$ 291,992,000	$ 256,871,000
Amounts charged to customers																							(547,243,000)	(219,579,000)	(44,557,000)
Arizona Public Service Company
Change in regulatory asset
Deferred fuel and purchased power costs — current period																							549,877,000	291,992,000	256,871,000
Amounts charged to customers																							$ (547,243,000)	$ (219,579,000)	$ (44,557,000)
Number of energy storage PPA | storage																							9	1	4
Number of energy storage PPA, terminated | storage																									1
Annual amount of approved equity infusions																							$ 150,000,000
Increased in equity contributions																													$ 500,000,000
Arizona Public Service Company | Damage from Fire, Explosion or Other Hazard
Change in regulatory asset
Past due balance threshold qualifying for payment extension																																		$ 75
ACC | Arizona Public Service Company
Settlement Agreement
Program term																						18 years
Change in regulatory asset
Number of public utility programs | program																						2
Solar power capacity | MW																						80
Arizona Renewable Energy Standard and Tariff | ACC | Arizona Public Service Company
Settlement Agreement
Plan term																							5 years
Arizona Renewable Energy Standard and Tariff 2018 | ACC | Arizona Public Service Company
Settlement Agreement
Amount of proposed budget																														$ 95,100,000			$ 86,200,000			$ 100,500,000	$ 93,100,000
Arizona Renewable Energy Standard and Tariff 2018 | ACC | Arizona Public Service Company | Minimum
Change in regulatory asset
Authorized spending in capital costs												$ 20,000,000
Arizona Renewable Energy Standard and Tariff 2018 | ACC | Arizona Public Service Company | Maximum
Change in regulatory asset
Authorized spending in capital costs												$ 30,000,000
Arizona Renewable Energy Standard and Tariff 2018 | ACC | Arizona Public Service Company | Solar Communities
Settlement Agreement
Program term												3 years
Power Supply Adjustor (PSA) | ACC | Arizona Public Service Company
Change in regulatory asset
Beginning balance																							$ 460,561,000	$ 388,148,000
Deferred fuel and purchased power costs — current period																							549,877,000	291,992,000
Amounts charged to customers																							(547,243,000)	(219,579,000)
Ending balance																							$ 463,195,000	$ 460,561,000	$ 388,148,000
PSA rate (in dollars per kWh) | $ / kWh								0.019074	0.006						0.007544
Forward component Of PSA rate1 (in dollars per kWh) | $ / kWh								(0.005527)							0.004842
Historical component Of PSA rate1 (in dollars per kWh) | $ / kWh								0.013071							0.012386
Period to reduce balancing account								24 months
Reporting threshold of balancing account								$ 500,000
Transition component of PSA rate | $ / kWh								0.011530
Power Supply Adjustor (PSA) | ACC | Arizona Public Service Company | Cost Recovery Mechanisms
Change in regulatory asset
Maximum increase decrease in PSA rate (in dollars per kWh) | $ / kWh																			0.004
PSA rate In prior years1 (in dollars per kWh) | $ / kWh															(0.004)
Retail Rate Case Filing with Arizona Corporation Commission | Arizona Public Service Company | Maximum
Change in regulatory asset
Fixed costs recoverable per power lost (in dollars per kWh) | $ / KWH_Kilowatt_hour																				2.68
Retail Rate Case Filing with Arizona Corporation Commission | ACC | Arizona Public Service Company
Change in regulatory asset
Commercial customers, market pricing, threshold | MW											140
Retail Rate Case Filing with Arizona Corporation Commission | ACC | Arizona Public Service Company | Coal Community Transition Plan | Navajo Nation Reservation
Change in regulatory asset
Lost revenue recovery					$ 59,600,000
Demand Side Management Adjustor Charge 2022 | ACC | Arizona Public Service Company
Settlement Agreement
Amount of proposed budget																																			$ 78,400,000
Change in regulatory asset
Rate matter, increase (decrease) in proposed budget																																			$ 14,000,000
Demand Side Management Adjustor Charge 2023 | ACC | Arizona Public Service Company
Settlement Agreement
Amount of proposed budget																															$ 88,000,000	$ 88,000,000
Environmental Improvement Surcharge | FERC | Arizona Public Service Company
Change in regulatory asset
Rate matters, environmental surcharge cap rate1 (in dollars per kWh) | $ / KWH_Kilowatt_hour															0.0005
Rate matters, environmental surcharge cap rate1, amount							$ 4,000,000
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
Environmental Improvement Surcharge | FERC | Arizona Public Service Company | Subsequent Event
Change in regulatory asset
Rate matters, increase (decrease) In cost recovery	$ 15,300,000
Rate matters, increase (decrease) In cost recovery, excess Of annual amount	$ 11,300,000
Environmental Improvement Surcharge | FERC | Arizona Public Service Company | Minimum
Change in regulatory asset
Rate matters, environmental surcharge cap rate1, amount															$ 13,000,000
Environmental Improvement Surcharge | FERC | Arizona Public Service Company | Maximum
Change in regulatory asset
Rate matters, environmental surcharge cap rate1, amount															$ 15,000,000
Transmission rates, transmission cost adjustor and other transmission matters | FERC | Arizona Public Service Company
Change in regulatory asset
Rate matters, increase (decrease) In cost recovery										$ 34,700,000			$ (33,000,000)				$ 4,000,000
Rate matters, increase (decrease) in cost recovery, wholesale customer rates										20,700,000			6,400,000				3,200,000
Rate matters, increase (decrease) in cost recovery, retail customer rates										14,000,000			(26,600,000)				7,200,000
Rate matters, increase (decrease) In retail revenue requirements										$ 10,000,000			$ 2,400,000				$ 28,400,000
Lost Fixed Cost Recovery Mechanism | Arizona Public Service Company
Change in regulatory asset
Fixed costs recoverable per power lost (in dollars per kWh)																										2.50	2.56
Rate matter cap percentage of retail revenue																							1.00%
Amount of adjustment approved representing prorated sales losses pending approval			$ 68,700,000											$ 59,100,000				$ 38,500,000
Increase (decrease) In amount Of adjustment representing prorated sales losses														$ 32,500,000				$ 11,800,000
Amount of adjustment representing annual recovery			$ 9,600,000
Net Metering | ACC | Arizona Public Service Company
Change in regulatory asset
Rate matters, cost of service, resource comparison proxy method, maximum annual percentage decrease		10.00%				10.00%						10.00%									10.00%
Rate matters, cost of service for interconnected dg system customers, grandfathered period																					20 years
Rate matters, cost of service for new customers, guaranteed export price period																					10 years
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						0.07619
Court Resolution Surcharge | ACC | Arizona Public Service Company
Change in regulatory asset
Court resolution surcharge (in dollars per kWh) | $ / KWH_Kilowatt_hour				0.00175
Lost revenue recovery				$ 59,600,000
2023 Transportation Electrification Plan | ACC | Arizona Public Service Company
Settlement Agreement
Amount of proposed budget																																$ 5,000,000
Navajo Nation Reservation | Coal Community Transition Plan | Arizona Public Service Company | Coal Community Transition Plan
Change in regulatory asset
Lost revenue recovery collected																							$ 9,400,000
Demand Side Management Adjustor Charge 2024 | ACC | Arizona Public Service Company
Settlement Agreement
Amount of proposed budget																												$ 91,500,000