Nuclear Decommissioning Trust Funds - Schedule of Available-for-Sale Debt Securities With Unrealized Losses (Details) $ in Millions |
6 Months Ended |
|---|---|
|
Jun. 30, 2025
USD ($)
| |
| Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] | |
| Fair Value | $ 151 |
| Unrealized Losses | (5) |
| Aggregate fair value of debt securities in a loss position for a duration of one year or longer | 94 |
| Corporate debt securities | |
| Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] | |
| Fair Value | 32 |
| Unrealized Losses | (1) |
| Municipal debt securities | |
| Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] | |
| Fair Value | 71 |
| Unrealized Losses | (2) |
| U.S. Government debt securities | |
| Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] | |
| Fair Value | 48 |
| Unrealized Losses | $ (1) |