Investments (Invested Assets on Deposit, Held in Trust and Pledged as Collateral - Narrative) (Details) - USD ($) $ in Millions |
Mar. 31, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Restricted Cash and Cash Equivalent Item [Line Items] | ||
| Invested assets on deposit (regulatory deposits) | $ 6,559 | $ 6,570 |
| Invested assets held in trust (reinsurance agreements) | 6,955 | 7,268 |
| Restricted Cash and Cash Equivalents | ||
| Restricted Cash and Cash Equivalent Item [Line Items] | ||
| Invested assets on deposit (regulatory deposits) | 112 | 126 |
| Invested assets held in trust (reinsurance agreements) | 113 | 328 |
| FHLB common stock | $ 217 | $ 218 |