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Segment Information - Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Segment Reporting Information [Line Items]    
Total assets $ 73,022 $ 76,578
Operating Segments | P&C Commercial Lines    
Segment Reporting Information [Line Items]    
Total assets 47,234 48,234
Operating Segments | P&C Personal Lines    
Segment Reporting Information [Line Items]    
Total assets 5,130 5,587
Operating Segments | Property & Casualty Other Operations    
Segment Reporting Information [Line Items]    
Total assets 3,897 3,792
Operating Segments | Group Benefits [Member]    
Segment Reporting Information [Line Items]    
Total assets 13,291 14,442
Operating Segments | Hartford Funds    
Segment Reporting Information [Line Items]    
Total assets 635 720
Corporate    
Segment Reporting Information [Line Items]    
Total assets $ 2,835 $ 3,803