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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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The price per share of the conversion feature embedded in the debt instrument.

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Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion.

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Contractual interest rate for funds borrowed, under the debt agreement.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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Common Stock Equity and Earnings Per Share - Additional Information (Details) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended
	Jun. 30, 2024 USD ($) day	Mar. 31, 2026 USD ($) agreement $ / shares shares	Apr. 01, 2026 USD ($)	Dec. 31, 2025 shares	Nov. 08, 2024 USD ($)
Subsidiary or Equity Method Investee [Line Items]
Common stock, authorized (in shares) \| shares		300,000,000		300,000,000
Convertible Notes Due Maturing June 2027 \| Convertible Debt
Subsidiary or Equity Method Investee [Line Items]
Debt instrument, convertible, conversion ratio		0.0108338
Pinnacle West Consolidated \| 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 dollars per share) \| $ / shares		$ 92.30
Debt instrument redemption price percentage		100.00%
Long-term debt		$ 525
Unamortized debt issuance expense		3
Convertible debt, fair value		597
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		$ 434			$ 900
Nine At the Market Offerings
Subsidiary or Equity Method Investee [Line Items]
Number of outstanding forward sale agreements \| agreement		9
Unsettled proceeds		$ 466
Tenth ATM Forward Sale Agreement \| Subsequent Event
Subsidiary or Equity Method Investee [Line Items]
Value of shares to be issued under ATM program			$ 100