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Long-Term Debt and Liquidity Matters - Narrative (Details) |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |  |  |  |  |
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Jun. 17, 2024 USD ($) | Jun. 12, 2024 USD ($) | Jun. 06, 2024 USD ($) | Apr. 19, 2024 USD ($) | Feb. 09, 2024 USD ($) | Dec. 12, 2023 USD ($) | Jun. 30, 2024 USD ($) day $ / shares | Jun. 30, 2024 USD ($) $ / shares | Jun. 30, 2024 USD ($) $ / shares shares | Jun. 30, 2023 USD ($) | May 09, 2024 USD ($) | Apr. 18, 2024 USD ($) | Oct. 27, 2023 USD ($) | Apr. 10, 2023 USD ($) creditFacility | Apr. 09, 2023 USD ($) | Dec. 15, 2022 USD ($) | Dec. 14, 2022 USD ($)
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term debt repayments under term loan facility |  |  |  |  |  |  |  |  | $ 350,000,000 | $ 0 |  |  |  |  |  |  |
APS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term debt repayments under term loan facility |  |  |  |  |  |  |  |  | 350,000,000 | 0 |  |  |  |  |  |  |
Annual amount of approved equity infusions |  |  |  |  |  |  |  |  | 150,000,000 |  |  |  |  |  |  |  |
Increased in equity contributions |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 |  |  |  |
Contributions from parent |  | $ 450,000,000 |  |  |  |  |  | $ 450,000,000 | $ 450,000,000 | $ 150,000,000 |  |  |  |  |  |  |
Public utilities, request to permanently modify permitted yearly equity infusions |  |  |  | 2.50% |  |  |  |  |  |  |  |  |  |  |  |  |
APS | ACC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public utility order short term debt authorization as percentage of capitalization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.00% |
Public utility order short term debt authorization, fixed amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 |
Public utility order long term debt, authorization |  |  |  |  |  |  |  |  |  |  |  | $ 8,000,000,000 |  |  |  | $ 8,000,000,000 | $ 7,500,000,000
Public utility order long term debt, increase in authorization limit |  |  |  | $ 9,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Forward Sale Agreements | Pinnacle West |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, settlement terms (in shares) | shares |  |  |  |  |  |  |  |  | 11,240,601 |  |  |  |  |  |  |  |
Sale of stock, settlement proceeds from issuance of common stock |  |  |  |  |  |  |  |  | $ 726,000,000 |  |  |  |  |  |  |  |
Term Loan | APS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  | $ 350,000,000 |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  |  |  |  | 364 days |  |  |  |  |  |  |  |  |  |  |
Variable rate |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] |  |  |  |  |  | Secured Overnight Financing Rate (SOFR) [Member] |  |  |  |  |  |  |  |  |  |  |
Proceeds from short-term debt |  |  |  |  | $ 350,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Senior Notes Due 2024 | APS | Senior notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  | $ 450,000,000 |  |  |  |  |  |
Debt instrument, interest rate | 3.35% |  |  |  |  |  |  |  |  |  | 5.70% |  |  |  |  |  |
Repayments of unsecured debt | $ 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 lines 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 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 |  |  |
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 in 2022 and 2023 | APS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term line of credit |  |  |  |  |  |  | $ 0 | $ 0 | $ 0 |  |  |  |  |  |  |  |
Debt, weighted average interest rate |  |  |  |  |  |  | 5.43% | 5.43% | 5.43% |  |  |  |  |  |  |  |
Letter of Credit | APS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding letters of credit |  |  |  |  |  |  | $ 27,000,000 | $ 27,000,000 | $ 27,000,000 |  |  |  |  |  |  |  |
Letter of Credit | Revolving Credit Facility Maturing April 2028 | APS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding letters of credit |  |  |  |  |  |  | 0 | 0 | 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 |  |  |  |  |  |  | 456,000,000 | 456,000,000 | 456,000,000 |  |  |  |  |  |  |  |
Pinnacle West | Convertible Notes Due Maturing June 2027 | Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 525,000,000 | $ 525,000,000 | $ 525,000,000 |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  | 4.75% | 4.75% | 4.75% |  |  |  |  |  |  |  |
Debt instrument, convertible, conversion ratio |  |  |  |  |  |  |  |  | 0.108338 |  |  |  |  |  |  |  |
Debt instrument, convertible, conversion price (in usd per share) | $ / shares |  |  |  |  |  |  | $ 92.30 | $ 92.30 | $ 92.30 |  |  |  |  |  |  |  |
Debt instrument redemption price percentage |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |
Long-term debt, gross |  |  |  |  |  |  | $ 518,000,000 | $ 518,000,000 | $ 518,000,000 |  |  |  |  |  |  |  |
Unamortized debt issuance expense |  |  |  |  |  |  | 7,000,000 | 7,000,000 | 7,000,000 |  |  |  |  |  |  |  |
Convertible debt, fair value |  |  |  |  |  |  | $ 530,000,000 | 530,000,000 | 530,000,000 |  |  |  |  |  |  |  |
Pinnacle West | Convertible Notes Due Maturing June 2027 | Convertible Debt | Debt Conversion Terms One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 | Convertible Notes Due Maturing June 2027 | Convertible Debt | Debt Conversion Terms Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |  |
Pinnacle West | Floating Rate Notes Due 2026 | Unsecured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 350,000,000 | 350,000,000 | 350,000,000 |  |  |  |  |  |  |  |
Variable rate |  |  |  |  |  |  | 0.82% |  |  |  |  |  |  |  |  |  |
Pinnacle West | 450 Million Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 450,000,000 |  |  |  | $ 450,000,000 | 450,000,000 | 450,000,000 |  |  |  |  |  |  |  |
Repayments of unsecured debt |  |  | $ 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pinnacle West | 175 Million Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | 175,000,000 | 175,000,000 | 175,000,000 |  |  |  |  |  |  |  |
Pinnacle West | Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term debt repayments under term loan facility |  |  |  |  |  |  | $ 350,000,000 |  |  |  |  |  |  |  |  |  |
Pinnacle West | Term Loan | APS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  |  |  |  |  | 364 days |  |  |  |  |  |  |  |  |  |
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 |  |  |
Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders (up to) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 300,000,000 |  |  |
Long-term line of credit |  |  |  |  |  |  | $ 0 | 0 | 0 |  |  |  |  |  |  |  |
Pinnacle West | Letter of Credit | Revolving Credit Facility Maturing April 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding letters of credit |  |  |  |  |  |  | 0 | 0 | 0 |  |  |  |  |  |  |  |
Pinnacle West | Commercial Paper | Revolving Credit Facility Maturing April 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  |  |  |  |  |  | $ 76,000,000 | $ 76,000,000 | $ 76,000,000 |  |  |  |  |  |  |  |
Debt, weighted average interest rate |  |  |  |  |  |  | 5.46% | 5.46% | 5.46% |  |  |  |  |  |  |  |

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