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Long-Term Debt and Liquidity Matters (Tables) | 3 Months Ended
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Mar. 31, 2019
Debt Disclosure [Abstract] |
Schedule of estimated fair value of long-term debt, including current maturities | The following table presents the estimated fair value of our long-term debt, including current maturities (dollars in thousands):
| As of March 31, 2019 |  | As of December 31, 2018
| Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
Pinnacle West | $ | 448,953 |  |  | $ | 446,835 |  |  | $ | 448,796 |  |  | $ | 443,955 |
APS | 4,687,155 |  |  | 4,942,057 |  |  | 4,689,436 |  |  | 4,789,608 |
Total | $ | 5,136,108 |  |  | $ | 5,388,892 |  |  | $ | 5,138,232 |  |  | $ | 5,233,563 |

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