Palo Verde Sale Leaseback Variable Interest Entities - Narrative (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) lease	Sep. 30, 2022 USD ($)	Dec. 31, 1986 trust
Palo Verde Sale Leaseback Variable Interest Entities
Less: Net income attributable to noncontrolling interests (Note 6)	$ 4,306,000	$ 4,306,000	$ 12,918,000	$ 12,918,000
APS
Palo Verde Sale Leaseback Variable Interest Entities
Number of VIE lessor trusts | trust					3
Less: Net income attributable to noncontrolling interests (Note 6)	4,306,000	4,306,000	12,918,000	12,918,000
Palo Verde VIE | APS
Palo Verde Sale Leaseback Variable Interest Entities
Less: Net income attributable to noncontrolling interests (Note 6)	$ 4,000,000	$ 4,000,000	13,000,000	$ 13,000,000
Initial loss exposure to the VIE's noncontrolling equity participants during lease extension period			324,000,000
Palo Verde VIE | APS | Maximum
Palo Verde Sale Leaseback Variable Interest Entities
Maximum loss exposure to the VIE's noncontrolling equity participants during lease extension period (up to)			$ 501,000,000
Palo Verde VIE | APS | Period Through 2033
Palo Verde Sale Leaseback Variable Interest Entities
Number of leases under which assets are retained | lease			3
Annual lease payments			$ 21,000,000
Palo Verde VIE | APS | Period Through 2033 | Maximum
Palo Verde Sale Leaseback Variable Interest Entities
Lease period (up to)			2 years