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INVESTMENTS - Schedule of Held-to-Maturity, Allowance for Credit Loss Rollforward (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Roll Forward]        
Beginning balance $ (8) $ 0 $ (9) $ 0
losses were not previously recorded 0 (9) 0 (9)
Increases in allowance on previously impaired securities 0 0 0 0
Decreases in allowance on previously impaired securities 0 0 0 0
Reduction in allowance due to disposals 0 0 0 0
Balance, end of period (8) (9) (8) (9)
Corporate Securities        
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Roll Forward]        
Beginning balance (2) 0 (2) 0
losses were not previously recorded 0 (2) 0 (2)
Increases in allowance on previously impaired securities 0 0 0 0
Decreases in allowance on previously impaired securities 0 0 0 0
Reduction in allowance due to disposals 0 0 0 0
Balance, end of period (2) (2) (2) (2)
Asset-backed Securities        
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Roll Forward]        
Beginning balance (6) 0 (6) 0
losses were not previously recorded 0 (6) 0 (6)
Increases in allowance on previously impaired securities 0 0 0 0
Decreases in allowance on previously impaired securities 0 0 0 0
Reduction in allowance due to disposals 0 0 0 0
Balance, end of period (5) (6) (5) (6)
Foreign corporate securities        
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Roll Forward]        
Beginning balance (1) 0 (1) 0
losses were not previously recorded 0 (1) 0 (1)
Increases in allowance on previously impaired securities 0 0 0 0
Decreases in allowance on previously impaired securities 0 0 0 0
Reduction in allowance due to disposals 0 0 0 0
Balance, end of period $ (1) $ (1) $ (1) $ (1)