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Long-Term Debt and Liquidity Matters (Tables) | 6 Months Ended
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Jun. 30, 2015
Debt Disclosure [Abstract] |
Schedule of estimated fair value of long-term debt, including current maturities | The following table represents the estimated fair value of our long-term debt, including current maturities (dollars in millions):
| As of June 30, 2015 |  | As of December 31, 2014
| Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
Pinnacle West | $ | 125 |  |  | $ | 125 |  |  | $ | 125 |  |  | $ | 125 |
APS | 3,544 |  |  | 3,818 |  |  | 3,290 |  |  | 3,714 |
Total | $ | 3,669 |  |  | $ | 3,943 |  |  | $ | 3,415 |  |  | $ | 3,839 |

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