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Managed Investment Entities - Narrative (Details) $ in Millions | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 29, 2024 USD ($) collateralized_loan_obligation | Mar. 31, 2023 USD ($) collateralized_loan_obligation | Mar. 31, 2024 USD ($) collateralized_loan_obligation | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Variable Interest Entity [Line Items] |  |  |  |  |
Percentage of investment of most subordinate debt tranche, Minimum |  |  | 13.30% |  |
Percentage of investment of most subordinate debt tranche, Maximum |  |  | 100.00% |  |
Number of collateralized loan obligation entities | collateralized_loan_obligation |  |  | 13 |  |
Number of collateralized loan obligation entities formed during the period | collateralized_loan_obligation | 1 | 1 |  |  |
Difference between aggregate unpaid principal balance and fair value of CLOs' fixed maturity investments |  |  | $ 95 | $ 109 |
Difference between aggregate unpaid principal balance and carrying value of CLOs' debt |  |  | 253 |  |
Carrying amount of CLO loans in default |  |  | 1 | 7 |
Aggregate unpaid principal balance of variable interest entity loans in default |  |  | 5 | 13 |
Available for sale (AFS) fixed maturities |  |  | 10,371 | 10,377 |
Collateralized loan obligations |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Available for sale (AFS) fixed maturities |  |  | 1,593 | 1,687 |
Managed by third parties | Collateralized loan obligations |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Available for sale (AFS) fixed maturities |  |  | 1,590 | 1,690 |
Variable interest entity, primary beneficiary |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Investment in CLO tranches |  |  | 201 |  |
Amount invested in a temporary warehousing entity |  | $ 119 | 169 | $ 137 | $ 112
Variable interest entity, primary beneficiary | Subordinated debt obligations |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Investment in CLO tranches |  |  | 139 |  |
New collateralized loan obligation temporary warehousing entities |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Amount invested in a temporary warehousing entity |  | 13 | $ 30 |  |
New collateralized loan obligation entities |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Face value of liabilities issued by managed investment entities on issuance date | $ 406 | 407 |  |  |
Face amount of managed investment entities liabilities purchased at issuance date | $ 32 | $ 16 |  |  |

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