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Long-Term Debt and Liquidity Matters (Tables) | 3 Months Ended
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Mar. 31, 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 March 31, 2020 |  | As of December 31, 2019
| Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
Pinnacle West | $ | 449,581 |  |  | $ | 448,449 |  |  | $ | 449,425 |  |  | $ | 450,822 |
APS | 5,033,743 |  |  | 5,634,265 |  |  | 5,183,133 |  |  | 5,743,570 |
Total | $ | 5,483,324 |  |  | $ | 6,082,714 |  |  | $ | 5,632,558 |  |  | $ | 6,194,392 |

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