Investments (Details) - Narrative - PLRMBS - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
Dec. 31, 2025 |
|
| Investments, Debt and Equity Securities [Abstract] | |||||
| PLRMBS - Previous Credit Losses | $ 270 | $ 270 | $ 278 | ||
| PLRMBS - Accretion or amortization in interest income associated with previous credit losses | $ 2 | $ 3 | $ 8 | $ 10 | |