Long-Term Debt and Liquidity Matters - Schedule of Estimated Fair Value of Long-Term Debt, Including Current Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Estimated fair value of long-term debt, including current maturities
Carrying Amount	$ 8,858,648	$ 8,415,622
Fair Value	7,918,992	7,555,653
Arizona Public Service Company
Estimated fair value of long-term debt, including current maturities
Carrying Amount	7,490,878	7,291,891
Fair Value	6,525,248	6,459,718
Pinnacle West
Estimated fair value of long-term debt, including current maturities
Carrying Amount	1,367,770	1,123,731
Fair Value	$ 1,393,744	$ 1,095,935