Debt and Liquidity Matters - Schedule of Estimated Fair Value of Long-Term Debt, Including Current Maturities (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Estimated fair value of long-term debt, including current maturities
Carrying Amount	$ 9,804,259	$ 8,858,648
Fair Value	9,202,287	7,918,992
APS
Estimated fair value of long-term debt, including current maturities
Carrying Amount	8,139,676	7,490,878
Fair Value	7,468,657	6,525,248
Pinnacle West
Estimated fair value of long-term debt, including current maturities
Carrying Amount	1,664,583	1,367,770
Fair Value	$ 1,733,630	$ 1,393,744

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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+ Details