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Investments | 6 Months Ended
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Jun. 30, 2024
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 | ​ | June 30, | ​ | December 31, | ​ | June 30, | ​ | December 31,
(in millions) |  | Maturity Dates |  | 2024 |  | 2023 |  | 2024 |  | 2023
Municipal bonds |  | 2067 |  | $ | 704 |  | $ | 636 | ​ | $ | 815 | ​ | $ | 757
Government and agency securities |  | 2074 |  | ​ | 1,104 |  | ​ | 1,072 | ​ |  | 1,195 | ​ |  | 1,186
Corporate bonds |  | 2072 |  | ​ | 464 |  | ​ | 361 | ​ |  | 507 | ​ |  | 401
Short-term investments and receivables/payables1 |  | One-year |  | ​ | 33 |  | ​ | 164 | ​ |  | 34 | ​ |  | 171
Total debt securities and other | ​ | ​ | ​ | $ | 2,305 | ​ | $ | 2,233 | ​ | ​ | 2,551 | ​ | ​ | 2,515
Equity securities |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 1,741 | ​ | ​ | 1,658
Total2 |  |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | $ | 4,292 | ​ | $ | 4,173
1 | As of June 30, 2024 and December 31, 2023, short-term investments included $6 million and $38 million of repurchase agreement payable by financial institutions which earned interest, were fully secured by U.S. Treasury securities, and mature by July 1, 2024 and January 2, 2024, respectively.
2 | Represents amounts before reduction for deferred tax liabilities on net unrealized gains of $397 million and $380 million as of June 30, 2024 and December 31, 2023, respectively.
Trust fund earnings (based on specific identification) increase the trust fund balance and the asset retirement obligation ("ARO") regulatory liability. Unrealized holding gains, net of losses, were $1.8 billion at both June 30, 2024 and December 31, 2023. The following table summarizes the gains and losses for the trust investments: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended June 30, | ​ | Six months ended June 30,
(in millions) |  | 2024 |  | 2023 |  | 2024 |  | 2023
Gross realized gains | ​ | $ | 47 | ​ | $ | 124 | ​ | $ | 102 | ​ | $ | 195
Gross realized losses | ​ |  | (5) | ​ |  | (8) | ​ |  | (14) | ​ |  | (31)
Net unrealized (losses)/gains for equity securities | ​ |  | (10) | ​ |  | (11) | ​ |  | 85 | ​ |  | 64
​ 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 holds strategic investments in companies focused on innovative clean energy related technologies and services, included as "Other investments" on Edison International's consolidated balance sheets. As of June 30, 2024 and December 31, 2023, these investments include $14 million and $12 million of equity investments without readily determinable fair values, 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 June 30, 2024 and December 31, 2023.

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