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SAN ONOFRE NUCLEAR GENERATING STATION (Tables) | 9 Months Ended
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Sep. 30, 2025
Public Utilities, General Disclosures [Abstract] |
Schedule of Nuclear Decommissioning Trusts Investments | Nuclear Decommissioning Trusts The following table shows the fair values and gross unrealized gains and losses for the securities held in the NDT on the Sempra and SDG&E Condensed Consolidated Balance Sheets. We provide additional fair value disclosures for the NDT in Note 9.
NUCLEAR DECOMMISSIONING TRUSTS |  |  |  |  |  |  |
(Dollars in millions) |  |  |  |  |  |  |
| Cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Estimated fair value
| September 30, 2025
Short-term investments, primarily cash equivalents | $ | 21 |  |  | $ | — |  |  | $ | — |  |  | $ | 21 |
Equity securities | 69 |  |  | 225 |  |  | (2) |  |  | 292 |
Debt securities: |  |  |  |  |  |  |
Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies(1) | 53 |  |  | 1 |  |  | — |  |  | 54 |
Municipal bonds(2) | 299 |  |  | 3 |  |  | (6) |  |  | 296 |
Other securities(3) | 252 |  |  | 5 |  |  | (3) |  |  | 254 |
Total debt securities | 604 |  |  | 9 |  |  | (9) |  |  | 604 |
Receivables (payables), net | (20) |  |  | — |  |  | — |  |  | (20) |
Total | $ | 674 |  |  | $ | 234 |  |  | $ | (11) |  |  | $ | 897 |
| December 31, 2024
Short-term investments, primarily cash equivalents | $ | 10 |  |  | $ | — |  |  | $ | — |  |  | $ | 10 |
Equity securities | 78 |  |  | 223 |  |  | (3) |  |  | 298 |
Debt securities: |  |  |  |  |  |  |
Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies | 67 |  |  | 1 |  |  | (1) |  |  | 67 |
Municipal bonds | 295 |  |  | 1 |  |  | (9) |  |  | 287 |
Other securities | 234 |  |  | 2 |  |  | (8) |  |  | 228 |
Total debt securities | 596 |  |  | 4 |  |  | (18) |  |  | 582 |
Receivables (payables), net | (15) |  |  | — |  |  | — |  |  | (15) |
Total | $ | 669 |  |  | $ | 227 |  |  | $ | (21) |  |  | $ | 875 |
(1) Maturity dates are 2025-2056. (2) Maturity dates are 2025-2065. (3) Maturity dates are 2025-2070.
Schedule of Sales of Securities By Nuclear Decommissioning Trusts | The following table shows the proceeds from sales of securities in the NDT and gross realized gains and losses on those sales.
SALES OF SECURITIES IN THE NUCLEAR DECOMMISSIONING TRUSTS
(Dollars in millions)
| Three months ended September 30, |  | Nine months ended September 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Proceeds from sales | $ | 210 |  |  | $ | 259 |  |  | $ | 709 |  |  | $ | 639 |
Gross realized gains | 12 |  |  | 17 |  |  | 43 |  |  | 41 |
Gross realized losses | 1 |  |  | 2 |  |  | 6 |  |  | 7 |

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