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SAN ONOFRE NUCLEAR GENERATING STATION (Tables) | 12 Months Ended
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Dec. 31, 2023
Regulated Operations [Abstract] |
Schedule of 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 Consolidated Balance Sheets. We provide additional fair value disclosures for the NDT in Note 12.
NUCLEAR DECOMMISSIONING TRUSTS
(Dollars in millions)
| Cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Estimated fair value
| December 31, 2023
Short-term investments, primarily cash equivalents | $ | 21 |  |  | $ | — |  |  | $ | — |  |  | $ | 21 |
Equity securities | 89 |  |  | 225 |  |  | (2) |  |  | 312 |
Debt securities: |  |  |  |  |  |  |
Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies(1) | 50 |  |  | 2 |  |  | (1) |  |  | 51 |
Municipal bonds(2) | 280 |  |  | 3 |  |  | (8) |  |  | 275 |
Other securities(3) | 228 |  |  | 3 |  |  | (11) |  |  | 220 |
Total debt securities | 558 |  |  | 8 |  |  | (20) |  |  | 546 |
Receivables (payables), net | (7) |  |  | — |  |  | — |  |  | (7) |
Total | $ | 661 |  |  | $ | 233 |  |  | $ | (22) |  |  | $ | 872 |
| December 31, 2022
Short-term investments, primarily cash equivalents | $ | 11 |  |  | $ | — |  |  | $ | — |  |  | $ | 11 |
Equity securities | 111 |  |  | 194 |  |  | (8) |  |  | 297 |
Debt securities: |  |  |  |  |  |  |
Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies | 40 |  |  | 1 |  |  | (1) |  |  | 40 |
Municipal bonds | 283 |  |  | 1 |  |  | (14) |  |  | 270 |
Other securities | 248 |  |  | — |  |  | (21) |  |  | 227 |
Total debt securities | 571 |  |  | 2 |  |  | (36) |  |  | 537 |
Receivables (payables), net | (4) |  |  | — |  |  | — |  |  | (4) |
Total | $ | 689 |  |  | $ | 196 |  |  | $ | (44) |  |  | $ | 841 |
(1) Maturity dates are 2025-2054. (2) Maturity dates are 2024-2062. (3) Maturity dates are 2024-2072.
Schedule of Securities Sold | 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)
| Years ended December 31,
| 2023 |  | 2022 |  | 2021
Proceeds from sales | $ | 592 |  |  | $ | 639 |  |  | $ | 961 |
Gross realized gains | 27 |  |  | 18 |  |  | 67 |
Gross realized losses | (14) |  |  | (20) |  |  | (5) |

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