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COMMISSIONS AND FEES; ADMINISTRATION AND OTHER FIDUCIARY FEES - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Brokerage commissions      
Disaggregation of Revenue [Line Items]      
Revenue recognized $ 448 $ 538 $ 639
Insurance distribution revenue      
Disaggregation of Revenue [Line Items]      
Revenue recognized $ 188 $ 201 $ 260