Regulatory Matters - Additional Information (Details)												1 Months Ended		10 Months Ended	12 Months Ended
	Dec. 17, 2021 USD ($)	Nov. 02, 2021 USD ($)	Oct. 27, 2021 USD ($)	Oct. 01, 2021 $ / kWh	Feb. 22, 2021 USD ($)	Jan. 21, 2021 USD ($)	Aug. 20, 2020 USD ($) Customer	May 01, 2020 $ / kWh	Nov. 14, 2019 USD ($) Customer	May 01, 2019 $ / kWh	Dec. 20, 2016	Sep. 30, 2018 USD ($)	Apr. 30, 2018 USD ($)	Dec. 31, 2020	Dec. 31, 2020 program MW	Dec. 31, 2021 USD ($)	Aug. 02, 2021
Regulatory Matters [Line Items]
Number of customers | Customer							3,800		13,000
Inconvenience payment							$ 25		$ 25
Arizona Public Service Company | Retired power plant costs
Regulatory Matters [Line Items]
Regulatory asset, net book value																$ 41,800,000
Arizona Public Service Company | Navajo plant
Regulatory Matters [Line Items]
Regulatory asset, net book value																62,200,000
Arizona Public Service Company | Navajo plant, coal reclamation regulatory asset
Regulatory Matters [Line Items]
Regulatory asset, net book value																16,800,000
Arizona Public Service Company | SCE | Four Corners Units 4 and 5
Regulatory Matters [Line Items]
Settlement agreement, ACC approved rate adjustment, annualized customer impact												$ 58,500,000	$ 67,500,000
Recommended rate adjustment, annualized customer impact, disallowance of investments		$ 194,000,000
Recommended rate adjustment, annualized customer impact, cost deferrals		$ 215,500,000
Potential charges																$ 154,400,000
Arizona Public Service Company | 2017 Settlement Agreement and its Customer Education and Outreach Plan
Regulatory Matters [Line Items]
Settlement amount					$ 24,750,000
Settlement amount returned to customers					$ 24,000,000
Arizona Public Service Company | Damage from Fire, Explosion or Other Hazard
Regulatory Matters [Line Items]
Customer support fund, payment period						8 months								8 months
Past due balance threshold qualifying for payment extension						$ 75
ACC | Arizona Public Service Company
Regulatory Matters [Line Items]
Number of public utility programs | program															2
Program term															18 years
Solar power capacity | MW															80
Net Metering | ACC | Arizona Public Service Company
Regulatory Matters [Line Items]
Cost of service, resource comparison proxy method, maximum annual percentage decrease											10.00%
Cost of service for interconnected DG system customers, grandfathered period											20 years
Guaranteed export price period											10 years
Request second-year energy price for exported energy | $ / kWh				0.094				0.094		0.105
Retail Rate Case Filing with Arizona Corporation Commission | ACC | Arizona Public Service Company | Navajo Nation, Hopi Tribe | Coal Community Transition Plan
Regulatory Matters [Line Items]
Recommended rate adjustment, annualized customer impact, cost deferrals			$ 215,500,000
Retail Rate Case Filing with Arizona Corporation Commission | ACC | Arizona Public Service Company | Navajo Nation, Economic Development Organization | Coal Community Transition Plan
Regulatory Matters [Line Items]
Disallowance of annual amortization percentage																	15.00%
Retail Rate Case Filing with Arizona Corporation Commission | ACC | Arizona Public Service Company | Navajo Nation Reservation | Coal Community Transition Plan
Regulatory Matters [Line Items]
Recommended rate adjustment, annualized customer impact, disallowance of investments	$ 215,000,000