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Long-Term Debt and Liquidity Matters (Tables) | 6 Months Ended
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Jun. 30, 2020
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 June 30, 2020 |  | As of December 31, 2019
| Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
Pinnacle West | $ | 496,610 |  |  | $ | 507,850 |  |  | $ | 449,425 |  |  | $ | 450,822 |
APS | 5,425,551 |  |  | 6,386,439 |  |  | 5,183,133 |  |  | 5,743,570 |
Total | $ | 5,922,161 |  |  | $ | 6,894,289 |  |  | $ | 5,632,558 |  |  | $ | 6,194,392 |

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