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Debt and Liquidity Matters - Additional Information (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 05, 2026 | Dec. 03, 2025 | Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025 | Jul. 31, 2026 | Jul. 30, 2026 | Mar. 10, 2026
Commercial paper |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |
Repayments of short-term debt | $ 50,000 |  |  |  |  |  |  |  |
APS |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |
Equity infusion from Pinnacle West | 100,000 |  | $ 100,000 | $ 300,000 | $ 100,000 | $ 300,000 |  |  |
Public utilities, request to permanently modify permitted yearly equity infusions |  |  |  |  | 2.50% |  |  |  |
Public utilities, number of basis point of approved rate |  |  | 0.0050 |  | 0.0050 |  |  |  |
APS | ACC | Subsequent Event |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |
Long term debt authorization |  |  |  |  |  |  | $ 12,000,000 | $ 9,500,000 |
Senior Unsecured Noted Maturing June 2029 | Senior Notes |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |
Debt issued | $ 500,000 |  |  |  |  |  |  |  |
Interest rate | 4.65% |  |  |  |  |  |  |  |
Senior Unsecured Notes Maturing June 2026 | Senior Notes |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |
Repayments of senior debt | $ 350,000 |  |  |  |  |  |  |  |
Senior Unsecured Notes Maturing March 2036 | APS | Senior Notes |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  |  |  |  | $ 600,000
Interest rate |  |  |  |  |  |  |  |  | 5.10%
Revolving credit facility | Revolving Credit Facility Maturing April 2029 | APS |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |
Current borrowing capacity on credit facility |  |  | $ 1,700,000 |  | $ 1,700,000 |  |  |  |
Accordion feature, increase increment |  |  | 400,000 |  | 400,000 |  |  |  |
Accordion feature, increase limit |  |  | 2,100,000 |  | 2,100,000 |  |  |  |
Long-term line of credit |  |  | $ 0 |  | $ 0 |  |  |  |
Debt, weighted average interest rate |  |  | 3.92% |  | 3.92% |  |  |  |
Letter of Credit | APS |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |
Outstanding letters of credit |  |  | $ 30,400 |  | $ 30,400 |  |  |  |
Letter of Credit | Revolving Credit Facility Maturing April 2029 | APS |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |
Outstanding letters of credit |  |  | 0 |  | 0 |  |  |  |
Commercial paper | APS |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |
Maximum commercial paper support available under credit facility |  |  | 1,500,000 |  | 1,500,000 |  |  |  |
Commercial paper | Revolving Credit Facility Maturing April 2029 | APS |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |
Commercial paper |  |  | 540,000 |  | $ 540,000 |  |  |  |
Pinnacle West Consolidated | Term Loan Facility Maturing December 3, 2026 |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument term |  |  |  |  | 364 days |  |  |  |
Debt issued |  |  | 175,000 |  | $ 175,000 |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  | 0.80% |  |  |  |
Loan amount drawn |  | $ 175,000 |  |  |  |  |  |  |
Pinnacle West Consolidated | Revolving credit facility | Revolving Credit Facility Maturing April 2029 |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |
Current borrowing capacity on credit facility |  |  | 300,000 |  | $ 300,000 |  |  |  |
Accordion feature, increase increment |  |  | 100,000 |  | 100,000 |  |  |  |
Accordion feature, increase limit |  |  | 400,000 |  | 400,000 |  |  |  |
Long-term line of credit |  |  | 0 |  | 0 |  |  |  |
Pinnacle West Consolidated | Letter of Credit | Revolving Credit Facility Maturing April 2029 |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |
Outstanding letters of credit |  |  | 0 |  | 0 |  |  |  |
Pinnacle West Consolidated | Commercial paper | Revolving Credit Facility Maturing April 2029 |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |
Current borrowing capacity on credit facility |  |  | 300,000 |  | 300,000 |  |  |  |
Commercial paper |  |  | $ 104,000 |  | $ 104,000 |  |  |  |
Debt, weighted average interest rate |  |  | 3.85% |  | 3.85% |  |  |  |

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- Definition Period between issuance and maturity of debt instrument, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Weighted average interest rate of debt outstanding. + References No definition available. + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 605 -Name Accounting Standards Codification -Section 55 -Paragraph 15 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477548/944-605-55-15 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 605 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477548/944-605-55-12 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477657/942-210-S45-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478478/942-210-S50-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S50 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480657/210-10-S50-9 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480657/210-10-S50-8 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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- Definition The cash inflow from a borrowing having initial term of repayment within one year or the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-14 + Details
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- Definition The cash outflow for a long-term debt where the holder has highest claim on the entity's asset in case of bankruptcy or liquidation during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-15 + Details
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- Definition The cash outflow for a borrowing having initial term of repayment within one year or the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-15 + Details
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