| **Document Entity and Information DEI**     | Dec. 10, 2024                               |
|---------------------------------------------|---------------------------------------------|
| **Entity Information [Line Items]**         |                                        |
| Entity Central Index Key                    | 0000764622                                  |
| Document Type                               | 8-K                                         |
| Document Period End Date                    | Dec. 10,  2024                              |
| Entity File Number                          | 1-8962                                      |
| Entity Emerging Growth Company              | false                                       |
| Title of 12(b) Security                     | Common Stock                                |
| Soliciting Material                         | false                                       |
| Written Communications                      | false                                       |
| Pre-commencement Tender Offer               | false                                       |
| Pre-commencement Issuer Tender Offer        | false                                       |
| Trading Symbol                              | PNW                                         |
| Security Exchange Name                      | NYSE                                        |
| Entity Registrant Name                      | PINNACLE WEST CAPITAL CORPORATION           |
| Entity Tax Identification Number            | 86-0512431                                  |
| Entity Address, Address Line One            | 400 North Fifth Street, P.O. Box 53999 |
| Entity Address, City or Town                | Phoenix                                     |
| Entity Address, State or Province           | AZ                                          |
| Entity Address, Postal Zip Code             | 85072-3999                                  |
| City Area Code                              | (602)                                       |
| Local Phone Number                          | 250-1000                                    |
| Amendment Flag                              | false                                       |
| Entity Incorporation, State or Country Code | AZ                                          |
| Arizona Public Service Company [Member]     |                                        |
| **Entity Information [Line Items]**         |                                        |
| Entity Central Index Key                    | 0000007286                                  |
| Document Type                               | 8-K                                         |
| Document Period End Date                    | Dec. 10,  2024                              |
| Entity File Number                          | 1-4473                                      |
| Entity Emerging Growth Company              | false                                       |
| Soliciting Material                         | false                                       |
| Written Communications                      | false                                       |
| Pre-commencement Tender Offer               | false                                       |
| Pre-commencement Issuer Tender Offer        | false                                       |
| Entity Registrant Name                      | ARIZONA PUBLIC SERVICE COMPANY              |
| Entity Tax Identification Number            | 86-0011170                                  |
| Entity Address, Address Line One            | 400 North Fifth Street, P.O. Box 53999 |
| Entity Address, City or Town                | Phoenix                                     |
| Entity Address, State or Province           | AZ                                          |
| Entity Address, Postal Zip Code             | 85072-3999                                  |
| City Area Code                              | (602)                                       |
| Local Phone Number                          | 250-1000                                    |
| Amendment Flag                              | false                                       |
| Entity Incorporation, State or Country Code | AZ                                          |

| X                                                                                                                                                                                                                                                                                             |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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Boolean flag that is true when the XBRL content amends previously-filed or accepted submission.
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| - Definition
Area code of city
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
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| - Definition
For the EDGAR submission types of Form 8-K: the date of the report, the date of the earliest event reported; for the EDGAR submission types of Form N-1A: the filing date; for all other submission types: the end of the reporting or transition period. The format of the date is YYYY-MM-DD.
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| X                                                                                                                                                                                                                                                                                                                                                                                    |
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| - Definition
The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.
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No definition available.
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| X                                                                                                                                                                                                                                                                          |
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| - Definition
Address Line 1 such as Attn, Building Name, Street Name
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| X                                                                                                                                                                                                                                         |
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| - Definition
Name of the City or Town
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| X                                                                                                                                                                                                                                                   |
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| - Definition
Code for the postal or zip code
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Name of the state or province.
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| - Definition
A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.
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| X                                                                                                                                                                                                                                                                                                                                                                                          |
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| - Definition
Indicate if registrant meets the emerging growth company criteria.
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| - Definition
Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.
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| X                                                                                                                                                                                                                                                                                                        |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Two-character EDGAR code representing the state or country of incorporation.
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| X                                                                                                                                                                                                                                                                                                                                                                                                          |
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| - Definition
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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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
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| - Definition
The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.
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| - Definition
The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.
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| X                                                                                                                                                                                                                                        |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Local phone number for entity.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
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| - Definition
Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act.
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Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act.
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Title of a 12(b) registered security.
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Name of the Exchange on which a security is registered.
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| - Definition
Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as soliciting material pursuant to Rule 14a-12 under the Exchange Act.
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Trading symbol of an instrument as listed on an exchange.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as written communications pursuant to Rule 425 under the Securities Act.
+ References
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| X                                                                                                                                                 |
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