REINSURANCE - Reinsurance Retention (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Carrying Value
Reinsurance Retention Policy [Line Items]
FHLB funding agreements	$ 42,336	$ 41,872
Carrying Value | Fixed maturities
Reinsurance Retention Policy [Line Items]
FHLB funding agreements	23,018	24,725
Carrying Value | Mortgage loans on real estate
Reinsurance Retention Policy [Line Items]
FHLB funding agreements	8,160	8,405
Carrying Value | Policy loans
Reinsurance Retention Policy [Line Items]
FHLB funding agreements	264	248
Carrying Value | Other equity investments
Reinsurance Retention Policy [Line Items]
FHLB funding agreements	190	238
Carrying Value | Other invested assets
Reinsurance Retention Policy [Line Items]
FHLB funding agreements	10,704	8,256
Fair Value
Reinsurance Retention Policy [Line Items]
FHLB funding agreements	41,374	40,879
Fair Value | Fixed maturities
Reinsurance Retention Policy [Line Items]
FHLB funding agreements	23,018	24,725
Fair Value | Mortgage loans on real estate
Reinsurance Retention Policy [Line Items]
FHLB funding agreements	7,197	7,409
Fair Value | Policy loans
Reinsurance Retention Policy [Line Items]
FHLB funding agreements	265	250
Fair Value | Other equity investments
Reinsurance Retention Policy [Line Items]
FHLB funding agreements	190	238
Fair Value | Other invested assets
Reinsurance Retention Policy [Line Items]
FHLB funding agreements	$ 10,704	$ 8,257