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Policyholder Liabilities (Reconciliation of Policyholders’ Account Balances to the Policyholders’ Account Balances’ Liability) (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Dec. 31, 2021
Policyholder Account Balance [Line Items]      
Policyholder account balance $ 60,226,094 $ 58,781,836  
Embedded derivative adjustment (1,684,963) (1,996,640)  
Policy benefit reserves 292,334 318,677  
Deferred profit liability 22,975 19,223  
Fixed Index Annuities      
Policyholder Account Balance [Line Items]      
Policyholder account balance 55,001,341 53,826,234 $ 55,003,305
Fixed Rate Annuities      
Policyholder Account Balance [Line Items]      
Policyholder account balance 6,549,813 6,589,577 $ 6,860,060
Other      
Policyholder Account Balance [Line Items]      
Policyholder account balance $ 44,594 $ 24,765