Nuclear Decommissioning Trust Funds - Schedule of Available-for-Sale Debt Securities With Unrealized Losses (Details) $ in Millions |
9 Months Ended |
|---|---|
|
Sep. 30, 2026
USD ($)
| |
| Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] | |
| Fair Value | $ 851 |
| Unrealized Losses | (43) |
| Corporate debt securities | |
| Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] | |
| Fair Value | 358 |
| Unrealized Losses | (16) |
| Municipal debt securities | |
| Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] | |
| Fair Value | 70 |
| Unrealized Losses | (5) |
| U.S. Government debt securities | |
| Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] | |
| Fair Value | 423 |
| Unrealized Losses | $ (22) |