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RESTRUCTURING - Additional Information (Details) - Chubb Restructuring Program - USD ($)
$ in Millions
12 Months Ended 24 Months Ended
Dec. 31, 2025
Dec. 31, 2023
Dec. 31, 2023
Restructuring Cost and Reserve [Line Items]      
Restructuring costs   $ 9 $ 67
Forecast      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs $ 125    
Other Accrued Liabilities      
Restructuring Cost and Reserve [Line Items]      
Restructuring liabilities   32 $ 32
Safety Services      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs   $ 37