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Reinsurance - Annuity Reinsurance Treaties and Related Recoverables (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Effects of Reinsurance [Line Items]    
Reinsurance Recoverable $ 9,168 $ 9,564
EquiTrust Life Insurance Company    
Effects of Reinsurance [Line Items]    
Reinsurance Recoverable 203 231
Athene Life Re Ltd.    
Effects of Reinsurance [Line Items]    
Reinsurance Recoverable 1,473 1,747
AeBe ISA LTD    
Effects of Reinsurance [Line Items]    
Reinsurance Recoverable 3,924 4,166
Reinsurance Group of America Inc. (RGA)    
Effects of Reinsurance [Line Items]    
Reinsurance Recoverable $ 3,568 $ 3,420