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Segment Information - Amortization of Deferred Policy Acquisition Costs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]      
Amortization of deferred policy acquisition costs ("DAC") $ 1,706 $ 1,622 $ 1,384
Operating Segments | P&C Commercial Lines      
Segment Reporting Information [Line Items]      
Amortization of deferred policy acquisition costs ("DAC") 1,397 1,296 1,048
Operating Segments | P&C Personal Lines      
Segment Reporting Information [Line Items]      
Amortization of deferred policy acquisition costs ("DAC") 244 259 275
Operating Segments | Group Benefits [Member]      
Segment Reporting Information [Line Items]      
Amortization of deferred policy acquisition costs ("DAC") 50 54 45
Operating Segments | Hartford Funds      
Segment Reporting Information [Line Items]      
Amortization of deferred policy acquisition costs ("DAC") 14 12 16
Corporate      
Segment Reporting Information [Line Items]      
Amortization of deferred policy acquisition costs ("DAC") $ 1 $ 1 $ 0