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Long-Term Debt and Liquidity Matters - Components of Long-Term Debt (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Long-Term Debt and Liquidity Matters [Line Items] |  |
Total long-term debt | $ 8,415,622 | $ 7,791,971
Long-term debt less current maturities (Note 6) | 7,540,622 | 7,741,286
Pinnacle West |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |
Gross long-term debt | 8,468,975 |
Unamortized discount | (15) | (25)
Unamortized debt issuance cost | (1,254) | (2,083)
Total long-term debt | 1,123,731 | 947,892
Less current maturities | 625,000 | 0
Total long-term debt less current maturities | 498,731 | 947,892
Long-term debt less current maturities (Note 6) | 498,731 | 947,892
Arizona Public Service Company |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |
Gross long-term debt | 7,343,975 |
Unamortized discount | (14,197) | (14,548)
Unamortized premium | 11,162 | 12,368
Unamortized debt issuance cost | (49,049) | (48,266)
Total long-term debt | 7,291,891 | 6,793,529
Less current maturities | 250,000 | 0
Total long-term debt less current maturities | 7,041,891 | 6,793,529
Long-term debt less current maturities (Note 6) | 7,041,891 | 6,793,529
Bright Canyon Energy Corporation |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |
Los Alamitos equity bridge loan | 0 | 27,575
Los Alamitos construction facility | 0 | 23,110
Unamortized debt issuance cost | 0 | (135)
Total long-term debt | 0 | 50,550
Less current maturities | 0 | 50,685
Total long-term debt less current maturities | 0 | (135)
Pollution Control Bonds - Variable | Arizona Public Service Company |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |
Gross long-term debt | $ 163,975 | $ 163,975
Weighted-average interest rate (as a percent) | 4.11% | 3.96%
Total Pollution Control Bonds | Arizona Public Service Company |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |
Gross long-term debt | $ 163,975 | $ 163,975
Senior Unsecured Notes | Pinnacle West |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |
Gross long-term debt | $ 500,000 | 500,000
Interest rate (as a percent) | 1.30% |
Senior Unsecured Notes | Arizona Public Service Company |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |
Gross long-term debt | $ 7,180,000 | 6,680,000
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% |
Term Loan | Pinnacle West |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |
Term loans | $ 625,000 | $ 450,000
Term Loan | Arizona Public Service Company |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |
Weighted-average interest rate (as a percent) | 6.20% | 5.10%

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