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Investments | 12 Months Ended
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Dec. 31, 2023
Investments |
Investments | Note 10. Investments Nuclear Decommissioning Trusts Future decommissioning costs related to SCE's nuclear assets are expected to be funded from independent decommissioning trusts. The following table sets forth amortized cost and fair value of the trust investments (see Note 4 for a discussion on fair value of the trust investments): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Amortized Costs | ​ | Fair Values
​ | ​ | Longest | ​ | December 31, | ​ | December 31, | ​ | December 31, | ​ | December 31,
(in millions) |  | Maturity Dates |  | 2023 |  | 2022 |  | 2023 |  | 2022
Municipal bonds |  | 2067 |  | $ | 636 |  | $ | 672 | ​ | $ | 757 | ​ | $ | 754
Government and agency securities |  | 2073 |  | ​ | 1,072 |  | ​ | 1,025 | ​ |  | 1,186 | ​ |  | 1,091
Corporate bonds |  | 2072 |  | ​ | 361 |  | ​ | 351 | ​ |  | 401 | ​ |  | 377
Short-term investments and receivables/payables1 |  | One-year |  | ​ | 164 |  | ​ | 110 | ​ |  | 171 | ​ |  | 116
Total debt securities and other | ​ | ​ | ​ | $ | 2,233 | ​ | $ | 2,158 | ​ | ​ | 2,515 | ​ | ​ | 2,338
Equity securities |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 1,658 | ​ | ​ | 1,610
Total2 |  |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | $ | 4,173 | ​ | $ | 3,948
1 | Short-term investments include $38 million and $41 million of repurchase agreements payable by financial institutions which earn interest, were fully and 97% secured by U.S. Treasury securities and mature by January 2, 2024 and January 3, 2023 as of December 31, 2023 and 2022, respectively.
2 | Represents amounts before reduction for deferred tax liabilities on net unrealized gains of $380 million and $321 million as of December 31, 2023 and 2022, respectively.
Trust fund earnings (based on specific identification) increase the trust fund balance and the ARO regulatory liability. Unrealized holding gains, net of losses, were $1.8 billion and $1.6 billion at December 31, 2023 and 2022, respectively. The following table summarizes the gains and losses for the trust investments: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years ended December 31,
(in millions) | ​ | 2023 |  | 2022 |  | 2021
Gross realized gains | ​ | $ | 323 | ​ | $ | 150 | ​ | $ | 339
Gross realized losses | ​ |  | (73) | ​ |  | (127) | ​ |  | (24)
Net unrealized gains/(losses) for equity securities | ​ |  | 103 | ​ |  | (369) | ​ |  | 103
​ Due to regulatory mechanisms, changes in the assets of the trusts from income or loss items do not materially affect earnings. Edison International Parent and Other's Investments Edison International Parent and Other hold strategic investments in companies focused on developing electric technologies and services, included as "Other investments" on Edison International's consolidated balance sheets. As of December 31, 2023 and December 31, 2022, these investments include $12 million of equity investments without readily determinable fair values. For information on fair value and unrealized gains/(losses) of marketable securities, see Note 4 and Note 16, respectively. The equity investments without readily determinable fair values balances included cumulative upward adjustments of $9 million, resulting primarily from values determined by additional capital infusions, at both December 31, 2023 and 2022.

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