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Segment Information - Non-insurance Revenue from Customers (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]      
Fee income $ 1,277 $ 1,301 $ 1,313
Other Income 126 170 105
Revenue from Contract with Customer, Excluding Assessed Tax 1,360 1,404 1,418
Installment billing fees [Member] | Operating Segments | P&C Commercial Lines      
Segment Reporting Information [Line Items]      
Fee income 30 35 34
Installment billing fees [Member] | Operating Segments | P&C Personal Lines      
Segment Reporting Information [Line Items]      
Fee income 34 37 40
Insurance servicing fees [Member] | Operating Segments | P&C Personal Lines      
Segment Reporting Information [Line Items]      
Other Income 81 83 84
Administrative services fees [Member] | Operating Segments | Group Benefits [Member]      
Segment Reporting Information [Line Items]      
Fee income 175 180 175
Advisor, distribution and other management fees [Member] | Operating Segments | Hartford Funds      
Segment Reporting Information [Line Items]      
Fee income 901 911 947
Other fees [Member] | Operating Segments | Hartford Funds      
Segment Reporting Information [Line Items]      
Fee income 88 88 85
Investment management and other fees [Member] | Corporate      
Segment Reporting Information [Line Items]      
Fee income 49 50 32
Transition service fees [Member] | Corporate      
Segment Reporting Information [Line Items]      
Other Income $ 2 $ 20 $ 21