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Segment Information - Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]    
Total assets $ 76,780 $ 73,008
Operating Segments | P&C Commercial Lines    
Segment Reporting Information [Line Items]    
Total assets 49,711 47,234
Operating Segments | P&C Personal Lines    
Segment Reporting Information [Line Items]    
Total assets 5,579 5,130
Operating Segments | Property & Casualty Other Operations    
Segment Reporting Information [Line Items]    
Total assets 4,235 3,897
Operating Segments | Group Benefits [Member]    
Segment Reporting Information [Line Items]    
Total assets 13,697 13,278
Operating Segments | Hartford Funds    
Segment Reporting Information [Line Items]    
Total assets 684 635
Corporate    
Segment Reporting Information [Line Items]    
Total assets $ 2,874 $ 2,834