Long-Term Debt and Liquidity Matters - Schedule of Components of Long-Term Debt on the Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Long-Term Debt and Liquidity Matters [Line Items]
Total long-term debt	$ 8,858,648	$ 8,415,622
LONG-TERM DEBT LESS CURRENT MATURITIES (Note 6)	8,058,648	7,540,622
Pinnacle West
Long-Term Debt and Liquidity Matters [Line Items]
Total	8,918,975
Unamortized discount	(5)	(15)
Unamortized debt issuance cost	(7,225)	(1,254)
Total long-term debt	1,367,770	1,123,731
Less current maturities	500,000	625,000
LONG-TERM DEBT LESS CURRENT MATURITIES (Note 6)	867,770	498,731
Arizona Public Service Company
Long-Term Debt and Liquidity Matters [Line Items]
Total	7,543,975
Unamortized discount	(14,252)	(14,197)
Unamortized premium	9,955	11,162
Unamortized debt issuance cost	(48,800)	(49,049)
Total long-term debt	7,490,878	7,291,891
Less current maturities	300,000	250,000
LONG-TERM DEBT LESS CURRENT MATURITIES (Note 6)	7,190,878	7,041,891
Pollution Control Bonds - Variable | Arizona Public Service Company
Long-Term Debt and Liquidity Matters [Line Items]
Total	$ 163,975	$ 163,975
Weighted-average interest rate (as a percent)	4.01%	4.11%
Total Pollution Control Bonds | Arizona Public Service Company
Long-Term Debt and Liquidity Matters [Line Items]
Total	$ 163,975	$ 163,975
Senior Unsecured Notes | Pinnacle West
Long-Term Debt and Liquidity Matters [Line Items]
Total	$ 1,025,000	500,000
Senior Unsecured Notes | Pinnacle West | Minimum
Long-Term Debt and Liquidity Matters [Line Items]
Interest rate (as a percent)	1.30%
Senior Unsecured Notes | Pinnacle West | Maximum
Long-Term Debt and Liquidity Matters [Line Items]
Interest rate (as a percent)	4.75%
Senior Unsecured Notes | Arizona Public Service Company
Long-Term Debt and Liquidity Matters [Line Items]
Total	$ 7,380,000	7,180,000
Senior Unsecured Notes | Arizona Public Service Company | Minimum
Long-Term Debt and Liquidity Matters [Line Items]
Interest rate (as a percent)	2.20%
Senior Unsecured Notes | Arizona Public Service Company | Maximum
Long-Term Debt and Liquidity Matters [Line Items]
Interest rate (as a percent)	6.88%
Floating Rate Notes Due 2026 | Pinnacle West | Unsecured Debt
Long-Term Debt and Liquidity Matters [Line Items]
Total	$ 350,000	0
Weighted-average interest rate (as a percent)	5.88%
Term Loan | Pinnacle West | Secured Debt
Long-Term Debt and Liquidity Matters [Line Items]
Total	$ 0	$ 625,000
Weighted-average interest rate (as a percent)		6.20%