v3.26.1
Segment Information (Details) - Amortization and Depreciation - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Segment reporting information        
Amortization and depreciation     $ 363 $ 352
Reportable Segments [Member]        
Segment reporting information        
Amortization and depreciation $ 168 $ 163 359 349
Reportable Segments [Member] | Business Insurance [Member]        
Segment reporting information        
Amortization and depreciation 101 100 215 213
Reportable Segments [Member] | Bond & Specialty Insurance [Member]        
Segment reporting information        
Amortization and depreciation 24 18 51 41
Reportable Segments [Member] | Personal Insurance [Member]        
Segment reporting information        
Amortization and depreciation $ 43 $ 45 $ 93 $ 95