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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