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Equity Investments (Tables) | 12 Months Ended
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Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract] |
Summary of Equity Investments | The following table summarizes Avista Corp.’s equity investments, which are included in “Other property and investments- net and other non-current assets” on the Consolidated Balance Sheets as of December 31 (dollars in millions):
|  | 2024 |  |  | 2023 |
Equity method investments |  | $ | 77 |  |  | $ | 79 |
Investments without readily determinable fair value |  |  |  |  |  |
Non-recurring fair value |  |  | 27 |  |  |  | 24 |
Recurring fair value |  |  | 53 |  |  |  | 50 |
Total |  | $ | 157 |  |  | $ | 153 |
Summary of Net Unrealized Gains Related to Investments without Readily Determinable Fair Value | he following table summarizes net unrealized gains (losses) related to investments without readily determinable fair value held as of the end of the respective period for the years ended December 31 (dollars in millions):
|  | 2024 |  |  | 2023 |  |  | 2022 |
Investments recorded at non-recurring fair value |  | $ | — |  |  | $ | — |  |  | $ | 12 |
Investments recorded at recurring fair value |  |  | — |  |  |  | (4 | ) |  |  | 33 |
Total |  | $ | — |  |  | $ | (4 | ) |  | $ | 45 |

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