Revenue - Additional Information (Details) - USD ($) $ in Thousands		10 Months Ended	12 Months Ended
	Jan. 21, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Operating revenues			$ 3,803,835	$ 3,586,982	$ 3,471,209
Regulatory cost recovery revenue			44,000	54,000	56,000
Damage from Fire, Explosion or Other Hazard | Arizona Public Service Company
Disaggregation of Revenue [Line Items]
Customer support fund, payment period	8 months	8 months
Electric Service | Residential
Disaggregation of Revenue [Line Items]
Operating revenues			1,913,324	1,929,178	1,761,122
Electric Service | Arizona Attorney General Settlement | Residential
Disaggregation of Revenue [Line Items]
Operating revenues				(24,000)
Electric and Transmission Service
Disaggregation of Revenue [Line Items]
Operating revenues			$ 3,760,000	$ 3,533,000	$ 3,415,000