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Segment Information - Reconciliation of Assets From Segment To Consolidated (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Segment Reporting Information [Line Items]    
Total assets $ 83,639 $ 80,917
Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total assets 80,416 77,905
Operating Segments [Member] | P&C Business Insurance    
Segment Reporting Information [Line Items]    
Total assets 55,682 53,296
Operating Segments [Member] | P&C Personal Insurance    
Segment Reporting Information [Line Items]    
Total assets 6,453 6,034
Operating Segments [Member] | Property & Casualty Other Operations [Member]    
Segment Reporting Information [Line Items]    
Total assets 4,237 4,312
Operating Segments [Member] | Employee Benefits [Member]    
Segment Reporting Information [Line Items]    
Total assets 13,289 13,502
Operating Segments [Member] | Hartford Funds [Member]    
Segment Reporting Information [Line Items]    
Total assets 755 761
Corporate, Non-Segment [Member]    
Segment Reporting Information [Line Items]    
Total assets $ 3,223 $ 3,012