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v3.26.1

Common Stock Equity and Earnings Per Share - Additional Information (Details) $ / shares in Units, $ in Millions | 1 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2024 USD ($) day | Jun. 30, 2026 USD ($) agreement $ / shares | Jun. 26, 2026 USD ($) | Nov. 08, 2024 USD ($)
Convertible Notes Due Maturing June 2027 | Convertible Debt |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |
Debt instrument, convertible, conversion ratio |  | 0.0108338 |  |
Pinnacle West Consolidated | Convertible Notes Due Maturing June 2027 | Convertible Debt |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |
Debt issued | $ 525 |  |  |
Interest rate | 4.75% |  |  |
Debt instrument, convertible, conversion price (in dollars per share) | $ / shares |  | $ 92.30 |  |
Debt instrument redemption price percentage |  | 100.00% |  |
Long-term debt |  | $ 525 |  |
Unamortized debt issuance expense |  | 2 |  |
Convertible debt, fair value |  | $ 629 |  |
Pinnacle West Consolidated | Convertible Notes Due Maturing June 2027 | Convertible Debt | Debt Conversion Terms One |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |
Debt instrument, convertible, threshold trading days | day | 20 |  |  |
Debt instrument, convertible, threshold consecutive trading days | day | 30 |  |  |
Debt instrument, convertible, threshold percentage of stock price trigger | 130.00% |  |  |
Pinnacle West Consolidated | Convertible Notes Due Maturing June 2027 | Convertible Debt | Debt Conversion Terms Two |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |
Debt instrument, convertible, threshold trading days | day | 5 |  |  |
Debt instrument, convertible, threshold consecutive trading days | day | 10 |  |  |
Debt instrument, convertible, threshold percentage of stock price trigger | 98.00% |  |  |
ATM Program |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |
Value of shares to be issued under ATM program |  |  |  | $ 900
Thirteen At the Market Offerings |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |
Number of outstanding forward sale agreements | agreement |  | 13 |  |
Unsettled proceeds |  | $ 816 |  |
Fourteenth ATM Forward Sale Agreement |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |
Value of shares to be issued under ATM program |  |  | $ 84 |

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