Long-Term Debt and Liquidity Matters - Schedule of Components of Long-Term Debt on the Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Long-Term Debt and Liquidity Matters [Line Items]
Total long-term debt	$ 9,805,676	$ 8,858,648
LONG-TERM DEBT LESS CURRENT MATURITIES (Note 7)	9,205,676	8,058,648
Pinnacle West Consolidated
Long-Term Debt and Liquidity Matters [Line Items]
Total	9,868,975
Unamortized discount	(681)	(5)
Unamortized debt issuance cost	(8,583)	(7,225)
Total long-term debt	1,665,736	1,367,770
Less current maturities	350,000	500,000
LONG-TERM DEBT LESS CURRENT MATURITIES (Note 7)	1,315,736	867,770
APS
Long-Term Debt and Liquidity Matters [Line Items]
Total	8,193,975
Unamortized discount	(16,796)	(14,252)
Unamortized premium	17,144	9,955
Unamortized debt issuance cost	(54,383)	(48,800)
Total long-term debt	8,139,940	7,490,878
Less current maturities	250,000	300,000
LONG-TERM DEBT LESS CURRENT MATURITIES (Note 7)	7,889,940	7,190,878
Pollution Control Bonds - Variable | APS
Long-Term Debt and Liquidity Matters [Line Items]
Total	$ 163,975	$ 163,975
Weighted-average interest rate	3.52%	4.01%
Total pollution control bonds | APS
Long-Term Debt and Liquidity Matters [Line Items]
Total	$ 163,975	$ 163,975
Senior unsecured notes | Pinnacle West Consolidated
Long-Term Debt and Liquidity Matters [Line Items]
Total	$ 1,325,000	1,025,000
Senior unsecured notes | Minimum | Pinnacle West Consolidated
Long-Term Debt and Liquidity Matters [Line Items]
Interest rate	4.75%
Senior unsecured notes | Maximum | Pinnacle West Consolidated
Long-Term Debt and Liquidity Matters [Line Items]
Interest rate	5.15%
Senior unsecured notes | APS
Long-Term Debt and Liquidity Matters [Line Items]
Total	$ 8,030,000	7,380,000
Senior unsecured notes | APS | Minimum
Long-Term Debt and Liquidity Matters [Line Items]
Interest rate	2.20%
Senior unsecured notes | APS | Maximum
Long-Term Debt and Liquidity Matters [Line Items]
Interest rate	6.88%
Floating Rate Notes Due 2026 | Pinnacle West Consolidated | Unsecured Debt
Long-Term Debt and Liquidity Matters [Line Items]
Total	$ 350,000	$ 350,000
Weighted-average interest rate	5.10%	5.88%