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Segment Information - Reconciliation of Assets From Segment To Consolidated (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Segment Reporting Information [Line Items]    
Total assets $ 82,307 $ 80,917
Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total assets 79,235 77,905
Operating Segments [Member] | P&C Business Insurance    
Segment Reporting Information [Line Items]    
Total assets 54,557 53,296
Operating Segments [Member] | P&C Personal Insurance    
Segment Reporting Information [Line Items]    
Total assets 6,221 6,034
Operating Segments [Member] | Property & Casualty Other Operations [Member]    
Segment Reporting Information [Line Items]    
Total assets 4,295 4,312
Operating Segments [Member] | Employee Benefits [Member]    
Segment Reporting Information [Line Items]    
Total assets 13,384 13,502
Operating Segments [Member] | Hartford Funds [Member]    
Segment Reporting Information [Line Items]    
Total assets 778 761
Corporate, Non-Segment [Member]    
Segment Reporting Information [Line Items]    
Total assets $ 3,072 $ 3,012