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Reinsurance - Effective Exit of Variable Annuity Reinsurance Business (Details) - Variable Annuity - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Ceded Credit Risk [Line Items]          
Market risk benefits reinsurance recoverable, including IBNR and outstanding claims, less premiums due $ 1,014   $ 1,014   $ 1,398
Incurred but not yet paid and outstanding claims 21   21   27
Premiums due         3
Impact of non-performance risk  
Berkshire          
Ceded Credit Risk [Line Items]          
Percent of future claim payments reinsured 100.00%   100.00%    
Remaining overall limit under reinsurance agreement $ 3,100   $ 3,100    
Market risk benefits reinsurance recoverable, including IBNR and outstanding claims, less premiums due 810   $ 810   1,116
Berkshire | Secured | Market risk benefits reinsurance recoverable, including IBNR and outstanding claims, less premiums due | Collateralization risk          
Ceded Credit Risk [Line Items]          
Concentration percentage     90.00%    
Sun Life Assurance Company of Canada          
Ceded Credit Risk [Line Items]          
Market risk benefits reinsurance recoverable, including IBNR and outstanding claims, less premiums due 81   $ 81   115
Liberty Re (Bermuda) Ltd.          
Ceded Credit Risk [Line Items]          
Market risk benefits reinsurance recoverable, including IBNR and outstanding claims, less premiums due 94   $ 94   128
Liberty Re (Bermuda) Ltd. | Secured | Market risk benefits reinsurance recoverable, including IBNR and outstanding claims, less premiums due | Collateralization risk          
Ceded Credit Risk [Line Items]          
Concentration percentage     100.00%    
SCOR SE          
Ceded Credit Risk [Line Items]          
Market risk benefits reinsurance recoverable, including IBNR and outstanding claims, less premiums due $ 29   $ 29   $ 39
SCOR SE | Secured | Market risk benefits reinsurance recoverable, including IBNR and outstanding claims, less premiums due | Collateralization risk          
Ceded Credit Risk [Line Items]          
Concentration percentage     85.00%