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Segment Information - Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Segment Reporting Information [Line Items]    
Total assets $ 76,578 $ 74,111
Operating Segments | P&C Commercial Lines    
Segment Reporting Information [Line Items]    
Total assets 48,234 45,482
Operating Segments | P&C Personal Lines    
Segment Reporting Information [Line Items]    
Total assets 5,587 5,969
Operating Segments | Property & Casualty Other Operations    
Segment Reporting Information [Line Items]    
Total assets 3,792 3,505
Operating Segments | Group Benefits [Member]    
Segment Reporting Information [Line Items]    
Total assets 14,442 14,732
Operating Segments | Hartford Funds    
Segment Reporting Information [Line Items]    
Total assets 720 662
Corporate    
Segment Reporting Information [Line Items]    
Total assets $ 3,803 $ 3,761