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Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock.

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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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Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instrument must exceed threshold percentage for specified number of trading days to trigger conversion feature.

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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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Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature.

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Face (par) amount of debt instrument at time of issuance.

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

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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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	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