Adjustments to Additional Paid in Capital, Contributions from Parent

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Represents the maximum borrowings available for the commercial paper program under the terms of line of credit facility.

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Represents the number of line of credit facilities.

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Public Utilities, Battery Storage Capacity

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Public Utilities, Solar Plant Capacity

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Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Weighted average interest rate of debt outstanding.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The fair value of notes issued in noncash investing and financing activities.

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Long-Term Debt and Liquidity Matters - Narrative (Details)	Jun. 30, 2023 USD ($)	Jan. 06, 2023 USD ($)	Feb. 11, 2022 USD ($) MW	Sep. 30, 2023 USD ($)	Aug. 04, 2023 USD ($)	Apr. 10, 2023 USD ($)	Apr. 09, 2023 USD ($) creditFacility	Dec. 16, 2022 USD ($)
APS
Long-Term Debt and Liquidity Matters
Equity infusion from Pinnacle West		$ 150,000,000
BCE
Long-Term Debt and Liquidity Matters
Solar plant capacity (in MW) \| MW			31
Battery storage capacity (in MW) \| MW			20
5.55% Unsecured Senior Notes Due Aug 2033 \| APS
Long-Term Debt and Liquidity Matters
Notes issued	$ 500,000,000
Debt instrument, interest rate				5.55%
Revolving Credit Facility \| Revolving Credit Facility Maturing May 2026 \| APS
Long-Term Debt and Liquidity Matters
Current borrowing capacity on credit facility							$ 500,000,000
Number of line of credit facilities \| creditFacility							2
Revolving Credit Facility \| Revolving Credit Facility Maturing April 2028 \| APS
Long-Term Debt and Liquidity Matters
Current borrowing capacity on credit facility						$ 1,250,000,000
Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders (up to)						1,650,000,000
Revolving Credit Facility \| Revolving Credit Facility Maturing in 2022 and 2023 \| APS
Long-Term Debt and Liquidity Matters
Long-term line of credit				$ 0
Debt, Weighted Average Interest Rate				5.44%
Revolving Credit Facility \| Revolving Credit Facility Maturing April 2028, Facility Two \| APS
Long-Term Debt and Liquidity Matters
Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders (up to)						400,000,000
Revolving Credit Facility \| Revolving Credit Facility Maturing April 2028, Facility One \| APS
Long-Term Debt and Liquidity Matters
Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders (up to)						400,000,000
Letter of Credit \| APS
Long-Term Debt and Liquidity Matters
Outstanding letters of credit				$ 8,000,000
Letter of Credit \| Revolving Credit Facility Maturing April 2028 \| APS
Long-Term Debt and Liquidity Matters
Outstanding letters of credit				0
Commercial Paper \| APS
Long-Term Debt and Liquidity Matters
Maximum commercial paper support available under credit facility						1,000,000,000	$ 750,000,000
Commercial Paper \| Revolving Credit Facility Maturing April 2028 \| APS
Long-Term Debt and Liquidity Matters
Commercial paper				313,000,000
Term Loan \| Non-Recourse Construction Term Loan Facility \| BCE
Long-Term Debt and Liquidity Matters
Debt instrument, face amount			$ 36,000,000
Bridge Loan \| Equity Bridge Loan Facility \| BCE
Long-Term Debt and Liquidity Matters
Debt instrument, face amount			$ 31,000,000		$ 31,000,000
Pinnacle West \| Revolving Credit Facility \| Revolving Credit Facility Maturing May 2026
Long-Term Debt and Liquidity Matters
Current borrowing capacity on credit facility						200,000,000
Pinnacle West \| Revolving Credit Facility \| Revolving Credit Facility Maturing April 2028
Long-Term Debt and Liquidity Matters
Current borrowing capacity on credit facility						200,000,000
Long-term line of credit				0
Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders (up to)						$ 300,000,000
Pinnacle West \| Letter of Credit \| Revolving Credit Facility Maturing April 2028
Long-Term Debt and Liquidity Matters
Outstanding letters of credit				0
Pinnacle West \| Commercial Paper \| Revolving Credit Facility Maturing April 2028
Long-Term Debt and Liquidity Matters
Commercial paper				$ 111,000,000
Debt, Weighted Average Interest Rate				5.45%
Pinnacle West \| Term Loan
Long-Term Debt and Liquidity Matters
Debt instrument, face amount								$ 175,000,000