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Long-Term Debt and Liquidity Matters - Components of Long-Term Debt (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Long-Term Debt and Liquidity Matters [Line Items] |  |
Total long-term debt | $ 5,138,232 | $ 4,871,713
Long-term debt less current maturities (Note 6) | $ 4,638,232 | 4,789,713
Interest rate (as a percent) | 3.90% |
Pinnacle West |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |
Gross long-term debt | $ 5,176,125 |
Unamortized discount | (121) | (184)
Unamortized debt issue costs | (1,083) | (1,395)
Total long-term debt | 448,796 | 298,421
Less current maturities | 0 | 0
Total long-term debt less current maturities | 448,796 | 298,421
Long-term debt less current maturities (Note 6) | 448,796 | 298,421
ARIZONA PUBLIC SERVICE COMPANY |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |
Gross long-term debt | 4,726,125 |
Unamortized discount | (12,638) | (11,288)
Unamortized premium | 7,736 | 8,049
Unamortized debt issue costs | (31,787) | (31,594)
Total long-term debt | 4,689,436 | 4,573,292
Less current maturities | 500,000 | 82,000
Total long-term debt less current maturities | 4,189,436 | 4,491,292
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) | 1.76% | 1.77%
Pollution Control Bonds - Fixed | ARIZONA PUBLIC SERVICE COMPANY |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |
Gross long-term debt | $ 115,150 | $ 147,150
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 | 183,125
Senior unsecured notes | ARIZONA PUBLIC SERVICE COMPANY |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |
Gross long-term debt | $ 4,575,000 | 4,275,000
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) | 8.75% |
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 | ARIZONA PUBLIC SERVICE COMPANY |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |
Weighted-average interest rate (as a percent) |  | 2.24%
Term loan | Term loans | ARIZONA PUBLIC SERVICE COMPANY |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |
Term loans | $ 0 | $ 150,000
Term loan | Term Loan Facility Maturing 2020 | Pinnacle West |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |
Term loans | $ 150,000 | $ 0
Weighted-average interest rate (as a percent) | 3.02% |

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- 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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