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Debt and Liquidity Matters (Tables) | 6 Months Ended
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Jun. 30, 2026
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 June 30, 2026 |  | As of December 31, 2025
| Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
Pinnacle West | $ | 1,815,466 |  |  | $ | 1,937,539 |  |  | $ | 1,665,736 |  |  | $ | 1,731,388 |
APS | 8,735,342 |  |  | 7,943,535 |  |  | 8,139,940 |  |  | 7,433,142 |
Total | $ | 10,550,808 |  |  | $ | 9,881,074 |  |  | $ | 9,805,676 |  |  | $ | 9,164,530 |

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