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Common Stock Equity and Earnings Per Share - Additional Information (Details) $ / shares in Units, $ in Millions | 1 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2024 USD ($) day | Sep. 30, 2025 USD ($) agreement $ / shares shares | May 22, 2025 shares | May 21, 2025 shares | Dec. 31, 2024 shares | Nov. 08, 2024 USD ($)
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |
Unsettled proceeds |  | $ 200 |  |  |  |
Common stock, authorized (in shares) | shares |  | 300,000,000 | 300,000,000 | 150,000,000 | 150,000,000 |
Convertible Notes Due Maturing June 2027 | Convertible Debt |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |
Debt instrument, convertible, conversion ratio |  | 0.0108338 |  |  |  |
Pinnacle West | Convertible Notes Due Maturing June 2027 | Convertible Debt |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |
Notes issued | $ 525 |  |  |  |  |
Interest rate | 4.75% |  |  |  |  |
Debt instrument, convertible, conversion price (in usd per share) | $ / shares |  | $ 92.30 |  |  |  |
Debt instrument redemption price percentage |  | 100.00% |  |  |  |
Long-term debt |  | $ 525 |  |  |  |
Unamortized debt issuance expense |  | 4 |  |  |  |
Convertible debt, fair value |  | 566 |  |  |  |
Pinnacle West | 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 | 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 |  | $ 700 |  |  |  | $ 900
At the Market Offering |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |
Number of outstanding forward sale agreements | agreement |  | 4 |  |  |  |

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