Nuclear Decommissioning Trust Funds - Schedule of Available-for-Sale Debt Securities With Unrealized Losses (Details) $ in Millions |
6 Months Ended |
|---|---|
|
Jun. 30, 2026
USD ($)
| |
| Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] | |
| Fair Value | $ 563 |
| Unrealized Losses | (9) |
| Corporate debt securities | |
| Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] | |
| Fair Value | 195 |
| Unrealized Losses | (3) |
| Municipal debt securities | |
| Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] | |
| Fair Value | 57 |
| Unrealized Losses | (1) |
| U.S. Government debt securities | |
| Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] | |
| Fair Value | 311 |
| Unrealized Losses | $ (5) |