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Long-Term Debt and Liquidity Matters (Tables) | 3 Months Ended
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Mar. 31, 2016
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, 2016 |  | As of December 31, 2015
| Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
Pinnacle West | $ | 125,000 |  |  | $ | 125,000 |  |  | $ | 125,000 |  |  | $ | 125,000 |
APS | 3,695,612 |  |  | 4,136,022 |  |  | 3,694,971 |  |  | 3,981,367 |
Total | $ | 3,820,612 |  |  | $ | 4,261,022 |  |  | $ | 3,819,971 |  |  | $ | 4,106,367 |

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