Annuity Reinsurance - Future Policy Benefits for Annuity Reinsurance Contracts (Details) - USD ($) $ in Millions |
Mar. 31, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Effects of Reinsurance [Line Items] | ||
| Future policy benefits for annuity reinsurance contracts | $ 475 | $ 0 |
| Annuity Reinsurance | ||
| Effects of Reinsurance [Line Items] | ||
| Future policy benefits for annuity reinsurance contracts | 447 | |
| Deferred Profit Liability | ||
| Effects of Reinsurance [Line Items] | ||
| Future policy benefits for annuity reinsurance contracts | $ 28 |