REINSURANCE - Reinsurance Retention (Details) $ in Millions	Sep. 30, 2023 USD ($)
Carrying Value
Reinsurance Retention Policy [Line Items]
FHLB funding agreements	$ 39,192
Carrying Value | Fixed maturities
Reinsurance Retention Policy [Line Items]
FHLB funding agreements	23,958
Carrying Value | Mortgage loans on real estate
Reinsurance Retention Policy [Line Items]
FHLB funding agreements	8,476
Carrying Value | Policy loans
Reinsurance Retention Policy [Line Items]
FHLB funding agreements	241
Carrying Value | Other equity investments
Reinsurance Retention Policy [Line Items]
FHLB funding agreements	227
Carrying Value | Other invested assets
Reinsurance Retention Policy [Line Items]
FHLB funding agreements	6,290
Fair Value
Reinsurance Retention Policy [Line Items]
FHLB funding agreements	37,887
Fair Value | Fixed maturities
Reinsurance Retention Policy [Line Items]
FHLB funding agreements	23,958
Fair Value | Mortgage loans on real estate
Reinsurance Retention Policy [Line Items]
FHLB funding agreements	7,171
Fair Value | Policy loans
Reinsurance Retention Policy [Line Items]
FHLB funding agreements	241
Fair Value | Other equity investments
Reinsurance Retention Policy [Line Items]
FHLB funding agreements	227
Fair Value | Other invested assets
Reinsurance Retention Policy [Line Items]
FHLB funding agreements	$ 6,290