Separate Accounts - Schedule of Aggregate Fair Value of Assets (Details) - USD ($) $ in Millions |
Mar. 31, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Fair Value, Separate Account Investment [Line Items] | ||
| Separate account assets | $ 4,093 | $ 4,369 |
| Equity funds | ||
| Fair Value, Separate Account Investment [Line Items] | ||
| Separate account assets | 1,924 | 2,077 |
| Balanced funds | ||
| Fair Value, Separate Account Investment [Line Items] | ||
| Separate account assets | 1,713 | 1,809 |
| Bond funds | ||
| Fair Value, Separate Account Investment [Line Items] | ||
| Separate account assets | 274 | 291 |
| Money market funds | ||
| Fair Value, Separate Account Investment [Line Items] | ||
| Separate account assets | $ 182 | $ 192 |