Regulatory Matters - Regulatory Matters - COVID-19 (Details) - ARIZONA PUBLIC SERVICE COMPANY - USD ($)			12 Months Ended
	Jan. 21, 2021	Dec. 31, 2020	Dec. 31, 2020	May 05, 2020
Public Utilities, General Disclosures [Line Items]
Demand side management funds				$ 36,000,000
Customer credits		$ 43,000,000	$ 43,000,000
Customer credits, additional funds		7,000,000	7,000,000
Voluntary funds		15,000,000	15,000,000
Customer COVID assistance		12,400,000	12,400,000
Non-customer funds		8,800,000	8,800,000
Bill credits for limited income customers		$ 3,600,000	3,600,000
Threshold percentage for deferral of potential recovery		50.00%
Threshold for deferral of potential recovery		$ 2,500,000	2,500,000
Customer support fund, bill credit		100	100
Expanded credit for limited income customers		300	300
Customer assistance, small customers, bill credit		1,000	1,000
Additional bill credit for delinquent limited income customers		250	250
Customer support fund, non-profits and community organizations		$ 2,700,000	2,700,000
Damage from Fire, Explosion or Other Hazard
Public Utilities, General Disclosures [Line Items]
Negative impact on operating results			$ 23,000,000
Damage from Fire, Explosion or Other Hazard | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Customer support fund, payment period	8 months
Past due balance threshold qualifying for payment extension	$ 75