Long-Term Debt and Liquidity Matters - Schedule of Estimated Fair Value of Long-Term Debt, Including Current Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Long-Term Debt and Liquidity Matters [Line Items]
Carrying Amount	$ 9,805,676	$ 8,858,648
Fair Value	9,164,530	7,918,992
APS
Long-Term Debt and Liquidity Matters [Line Items]
Carrying Amount	8,139,940	7,490,878
Fair Value	7,433,142	6,525,248
Pinnacle West Consolidated
Long-Term Debt and Liquidity Matters [Line Items]
Carrying Amount	1,665,736	1,367,770
Fair Value	$ 1,731,388	$ 1,393,744