Derivative Financial Instruments - Schedule of CDS Notional Amounts by Credit Rating And Fair Value of Protection Sold (Details) - Credit default contracts - USD ($) $ in Millions |
Jun. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Derivative [Line Items] | ||
| Notional amount | $ 347 | $ 550 |
| Fair value | 10 | 9 |
| AAA | ||
| Derivative [Line Items] | ||
| Notional amount | 0 | 0 |
| AA | ||
| Derivative [Line Items] | ||
| Notional amount | 0 | 0 |
| A | ||
| Derivative [Line Items] | ||
| Notional amount | 0 | 0 |
| BBB | ||
| Derivative [Line Items] | ||
| Notional amount | 300 | 550 |
| BB and lower | ||
| Derivative [Line Items] | ||
| Notional amount | $ 47 | $ 0 |