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LONG-TERM SUBORDINATED NOTES - Schedule of Interest Expense Incurred in Connection with Long Term Subordinated Notes (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Subordinated Debt        
Debt Instrument [Line Items]        
Interest expense incurred $ 4 $ 4 $ 12 $ 13