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LIABILITY FOR UNPAID CLAIMS AND CLAIM ADJUSTMENT EXPENSES - Schedule of Information on Liability for Unpaid Claims (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Policy and contract claims, beginning $ 7,288 $ 1,786    
Less: Unpaid claims balance, beginning – long-duration 198 217    
Gross unpaid claims balance, beginning – short-duration 7,090 1,569    
Less: Reinsurance recoverables, beginning 3,045 306    
Foreign currency translation 2 0 $ 4 $ 0
Net unpaid claims balance, beginning – short-duration 4,041 1,263    
Add: incurred related to        
Current accident year 1,177 816    
Prior accident years (34) 22    
Total incurred claims 1,211 794    
Less: paid claims related to        
Current accident year 306 342    
Prior accident years 776 348    
Total paid claims 1,082 690    
Net unpaid claims balance, ending – short-duration 4,170 1,367    
Add: Reinsurance recoverables, ending 3,026 303    
Gross unpaid claims balance, ending – short-duration 7,198 1,670    
Add: Unpaid claims balance, ending – long duration 199 198    
Policy and contract claims, ending $ 7,397 $ 1,868