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Segment Information - Non-insurance Revenue from Customers (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]      
Fee income $ 1,488 $ 1,277 $ 1,301
Other Income 81 126 170
Revenue from Contract with Customer, Excluding Assessed Tax 1,569 1,360 1,404
Installment billing fees [Member] | Operating Segments | P&C Commercial Lines      
Segment Reporting Information [Line Items]      
Fee income 34 30 35
Installment billing fees [Member] | Operating Segments | P&C Personal Lines      
Segment Reporting Information [Line Items]      
Fee income 32 34 37
Insurance servicing fees [Member] | Operating Segments | P&C Personal Lines      
Segment Reporting Information [Line Items]      
Other Income 80 81 83
Administrative services fees [Member] | Operating Segments | Group Benefits [Member]      
Segment Reporting Information [Line Items]      
Fee income 183 175 180
Advisor, distribution and other management fees [Member] | Operating Segments | Hartford Funds      
Segment Reporting Information [Line Items]      
Fee income 1,086 901 911
Other fees [Member] | Operating Segments | Hartford Funds      
Segment Reporting Information [Line Items]      
Fee income 103 88 88
Investment management and other fees [Member] | Corporate      
Segment Reporting Information [Line Items]      
Fee income 50 49 50
Transition service fees [Member] | Corporate      
Segment Reporting Information [Line Items]      
Other Income $ 1 $ 2 $ 20