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Future Policy Benefits - Summary of Balances and Changes in the Deferred Profit Liability (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Immediate Annuities |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Balance, beginning of year | $ 87 | $ 69 |
Effect of modeling changes |  | 0 | $ 4
Effect of changes in cash flow assumptions |  | 0 | 0
Effect of actual variances from expected experience |  | 2 | 16
Balance adjusted for variances from expectation |  | 89 | 89
Issuances | 1 | 3 |
Interest accrual | 0 | 2 |
Amortization | (2) | (7) |
Balance, end of year | 88 | 87 |
PRT |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Balance, beginning of year | 10 | 4 |
Effect of modeling changes |  | 0 | 0
Effect of changes in cash flow assumptions |  | (4) | 1
Effect of actual variances from expected experience |  | 2 | 5
Balance adjusted for variances from expectation |  | 8 | $ 10
Issuances | 0 | 0 |
Interest accrual | 0 | 1 |
Amortization | 0 | (1) |
Balance, end of year | $ 8 | $ 10 |

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