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INVESTMENTS - Schedule of Allowance For Credit Loss Rollforward (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]        
Beginning balance $ (62) $ (42) $ (54) $ (30)
Credit losses on securities where credit losses were not previously recorded (2) (10) (14) (23)
Increases in allowance on previously impaired securities 0 (1) 0 (1)
Decreases in allowance on previously impaired securities 0 0 0 0
Reduction in allowance due to disposals 1 10 6 11
Balance, end of period (63) (43) (63) (43)
Corporate Securities        
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]        
Beginning balance (55) (20) (45) (19)
Credit losses on securities where credit losses were not previously recorded (2) (5) (14) (7)
Increases in allowance on previously impaired securities 0 (1) 0 (1)
Decreases in allowance on previously impaired securities 0 0 0
Reduction in allowance due to disposals 1 0 4 1
Balance, end of period (56) (26) (56) (26)
Asset-backed Securities        
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]        
Beginning balance 0 (8) 0 (8)
Credit losses on securities where credit losses were not previously recorded 0 0 0 0
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 8 0 8
Balance, end of period 0 0 0 0
Foreign corporate securities        
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]        
Beginning balance (7) (14) (10) (3)
Credit losses on securities where credit losses were not previously recorded 0 (5) 0 (16)
Increases in allowance on previously impaired securities 0 (1) 0 (1)
Decreases in allowance on previously impaired securities 0 0 0
Reduction in allowance due to disposals 0 2 3 2
Balance, end of period $ (7) $ (17) $ (7) $ (17)