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Nuclear Decommissioning Trust Funds | 6 Months Ended
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Jun. 30, 2025
Investments, Debt and Equity Securities [Abstract] |
Nuclear Decommissioning Trust Funds | 6. Nuclear Decommissioning Trust Funds
|  | June 30, 2025 |  | December 31, 2024
|  | Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value |  | Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
Cash equivalents |  | $ | 14 |  |  | $ | — |  |  | $ | — |  |  | $ | 14 |  |  | $ | 3 |  |  | $ | — |  |  | $ | — |  |  | $ | 3 |
Equity securities |  | 513 |  |  | 680 |  |  | (47) |  |  | 1,146 |  |  | 509 |  |  | 651 |  |  | (55) |  |  | 1,105 |
Debt securities |  | 615 |  |  | 7 |  |  | (5) |  |  | 617 |  |  | 615 |  |  | 3 |  |  | (7) |  |  | 611 |
Receivables (payables), net |  | 13 |  |  | — |  |  | — |  |  | 13 |  |  | 5 |  |  | — |  |  | — |  |  | 5 |
NDT Funds |  | $ | 1,155 |  |  | $ | 687 |  |  | $ | (52) |  |  | $ | 1,790 |  |  | $ | 1,132 |  |  | $ | 654 |  |  | $ | (62) |  |  | $ | 1,724 |
See Note 11 for additional information on the NDT fair value. There were no available-for-sale debt securities with credit losses as of June 30, 2025 and December 31, 2024. As of June 30, 2025, there was no intent to sell available-for-sale debt securities with unrealized losses, and it is not more likely than not that each of these investments will be required to be sold before the recovery of its amortized cost. The aggregate fair value of available-for-sale debt securities with unrealized losses as of June 30, 2025 was:
|  | Fair Value |  | Unrealized Losses
Corporate debt securities |  | $ | 32 |  |  | $ | (1) |
Municipal debt securities |  | 71 |  | (2) |
U.S. Government debt securities |  | 48 |  | (1) |
Debt securities in unrealized loss position |  | $ | 151 |  |  | $ | (5) |
As of June 30, 2025, the aggregate fair value of debt securities in a loss position for a duration of one year or longer were $94 million and the unrealized losses were non-material. The contractual maturities for available-for-sale debt securities presented on the Consolidated Balance Sheets were:
|  | June 30, 2025 |  | December 31, 2024
Maturities within one year |  | $ | 66 |  |  | $ | 82 |
Maturities within two to five years |  | 196 |  |  | 220 |
Maturities thereafter |  | 356 |  |  | 309 |
Debt securities, fair value |  | $ | 617 |  |  | $ | 611 |
The sales proceeds, gains, and losses for available-for-sale debt securities for the periods were:
|  | Three Months Ended June 30, |  | Six Months Ended June 30, |  |  |
|  | 2025 |  | 2024 |  | 2025 |  | 2024 |  |  |  |  |
Sales proceeds of NDT funds investments (a) |  | $ | 592 |  |  | $ | 535 |  |  | $ | 1,168 |  |  | $ | 1,034 |  |  |  |  |  |
Gross realized gains |  | 4 |  |  | 2 |  |  | 7 |  |  | 5 |  |  |  |  |  |
Gross realized losses |  | (3) |  |  | (3) |  |  | (5) |  |  | (6) |  |  |  |  |  |
__________________ (a)Sales proceeds are used to pay income taxes and trust management fees. Remaining proceeds are reinvested in the NDT.

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