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Long-Term Debt and Liquidity Matters (Tables) | 3 Months Ended
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Mar. 31, 2021
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, 2021 |  | As of December 31, 2020
| Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
Pinnacle West | $ | 646,525 |  |  | $ | 653,395 |  |  | $ | 496,321 |  |  | $ | 509,050 |
APS | 5,818,520 |  |  | 6,436,224 |  |  | 5,817,945 |  |  | 7,103,791 |
Total | $ | 6,465,045 |  |  | $ | 7,089,619 |  |  | $ | 6,314,266 |  |  | $ | 7,612,841 |

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