Long-Term Debt and Liquidity Matters - Estimated Fair Value of Long-term Debt, Including Current Maturities (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Estimated fair value of long-term debt, including current maturities
Carrying Amount	$ 9,056,225	$ 8,415,622
Fair Value	8,045,129	7,555,653
APS
Estimated fair value of long-term debt, including current maturities
Carrying Amount	7,489,052	7,291,891
Fair Value	6,486,298	6,459,718
Pinnacle West
Estimated fair value of long-term debt, including current maturities
Carrying Amount	1,567,173	1,123,731
Fair Value	$ 1,558,831	$ 1,095,935