Long-Term Debt and Liquidity Matters - Schedule of Principal Payments Due on Pinnacle West's and APS's Total Long-Term Debt (Details) $ in Thousands	Dec. 31, 2025 USD ($)
APS
Long-Term Debt and Liquidity Matters [Line Items]
2026	$ 250,000
2027	300,000
2028	0
2029	568,975
2030	0
Thereafter	7,075,000
Total	8,193,975
Pinnacle West Consolidated
Long-Term Debt and Liquidity Matters [Line Items]
2026	600,000
2027	825,000
2028	400,000
2029	568,975
2030	400,000
Thereafter	7,075,000
Total	$ 9,868,975