Future Policy Benefits - Schedule of Liability for Future Policy Benefit Expected Future Policy Benefit Undiscounted (Details) - USD ($) $ in Millions |
Sep. 30, 2026 |
Sep. 30, 2025 |
|---|---|---|
| Traditional Life | ||
| Undiscounted | ||
| Expected future benefit payments | $ 2,345 | $ 2,569 |
| Expected future gross premiums | 772 | 875 |
| Discounted | ||
| Expected future benefit payments | 1,635 | 1,892 |
| Expected future gross premiums | 541 | 650 |
| Immediate annuities | ||
| Undiscounted | ||
| Expected future benefit payments | 3,036 | 3,125 |
| Expected future gross premiums | 0 | 0 |
| Discounted | ||
| Expected future benefit payments | 1,136 | 1,304 |
| Expected future gross premiums | 0 | 0 |
| PRT | ||
| Undiscounted | ||
| Expected future benefit payments | 13,682 | 11,809 |
| Expected future gross premiums | 0 | 0 |
| Discounted | ||
| Expected future benefit payments | 7,875 | 7,363 |
| Expected future gross premiums | $ 0 | $ 0 |