Income Taxes - Summary of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax [Line Items]
Tax positions, that if recognized, would decrease our effective tax rate	$ 22,813	$ 19,504	$ 16,373
Unrecognized tax benefit interest expense/(benefit) recognized	459	(780)	577
Unrecognized tax benefit interest accrued	1,589	1,130	1,910
ARIZONA PUBLIC SERVICE COMPANY
Income Tax [Line Items]
Tax positions, that if recognized, would decrease our effective tax rate	22,813	19,504	16,373
Unrecognized tax benefit interest expense/(benefit) recognized	459	(780)	577
Unrecognized tax benefit interest accrued	$ 1,589	$ 1,130	$ 1,910