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Long-Term Debt and Liquidity Matters - Components of Long-Term Debt (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Long-Term Debt and Liquidity Matters [Line Items] |  |
Total long-term debt | $ 5,632,558 | $ 5,138,232
Long-term debt less current maturities (Note 7) | 4,832,558 | 4,638,232
Pinnacle West |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |
Gross long-term debt | 5,676,125 |
Unamortized discount | (57) | (121)
Unamortized debt issue costs | (518) | (1,083)
Total long-term debt | 449,425 | 448,796
Less current maturities | 450,000 | 0
Total long-term debt less current maturities | (575) | 448,796
Long-term debt less current maturities (Note 7) | (575) | 448,796
ARIZONA PUBLIC SERVICE COMPANY |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |
Gross long-term debt | 5,226,125 |
Unamortized discount | (12,434) | (12,638)
Unamortized premium | 7,423 | 7,736
Unamortized debt issue costs | (37,981) | (31,787)
Total long-term debt | 5,183,133 | 4,689,436
Less current maturities | 350,000 | 500,000
Total long-term debt less current maturities | 4,833,133 | 4,189,436
Long-term debt less current maturities (Note 7) | 4,833,133 | 4,189,436
Pollution Control Bonds - Variable | ARIZONA PUBLIC SERVICE COMPANY |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |
Gross long-term debt | $ 35,975 | $ 35,975
Pollution Control Bonds - Variable | ARIZONA PUBLIC SERVICE COMPANY | Minimum |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |
Weighted-average interest rate (as a percent) | 1.54% | 1.76%
Pollution Control Bonds - Fixed | ARIZONA PUBLIC SERVICE COMPANY |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |
Gross long-term debt | $ 115,150 | $ 115,150
Pollution Control Bonds - Fixed | ARIZONA PUBLIC SERVICE COMPANY | Maximum |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |
Interest rate (as a percent) | 4.70% |
Total Pollution Control Bonds | ARIZONA PUBLIC SERVICE COMPANY |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |
Gross long-term debt | $ 151,125 | 151,125
Senior unsecured notes | ARIZONA PUBLIC SERVICE COMPANY |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |
Gross long-term debt | $ 4,875,000 | 4,575,000
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% |
Senior unsecured notes | Pinnacle West |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |
Gross long-term debt | $ 300,000 | 300,000
Interest rate (as a percent) | 2.25% |
Term loan | Term loans | ARIZONA PUBLIC SERVICE COMPANY |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |
Term loans | $ 200,000 | 0
Term loan | Term Loan Facility Maturing 2020 | Pinnacle West |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |
Term loans | $ 150,000 | $ 150,000
Weighted-average interest rate (as a percent) | 2.20% | 3.02%
Term loan | Term Loan Facility Maturing 2020 | ARIZONA PUBLIC SERVICE COMPANY |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |
Weighted-average interest rate (as a percent) | 2.12% |

X
- Definition Sum of the carrying values as of the balance sheet date of total long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year or the normal operating cycle, if longer plus capital lease obligations due to be paid more than one year after the balance sheet date. + References No definition available. + Details
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