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Debt and Liquidity Matters (Tables)
 9 Months Ended
Sep. 30, 2025
Debt Disclosure [Abstract]  
Schedule of Estimated Fair Value of Long-Term Debt, Including Current Maturities The following table presents the estimated fair value of our long-term debt, including current maturities (dollars in thousands):
 As of September 30, 2025As of December 31, 2024
 Carrying
Amount		Fair ValueCarrying
Amount		Fair Value
Pinnacle West$1,664,583 $1,733,630 $1,367,770 $1,393,744 
APS8,139,676 7,468,657 7,490,878 6,525,248 
Total$9,804,259 $9,202,287 $8,858,648 $7,918,992