Nuclear Decommissioning Trust Funds - Schedule of Sales Proceeds, Gains, and Losses for Available-for-Sale Debt Securities (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| Investments, Debt and Equity Securities [Abstract] | ||||
| Sales proceeds of NDT funds investments | $ 592 | $ 535 | $ 1,168 | $ 1,034 |
| Gross realized gains | 4 | 2 | 7 | 5 |
| Gross realized losses | $ (3) | $ (3) | $ (5) | $ (6) |