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Segment Information - Amortization of Deferred Policy Acquisition Costs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Segment Reporting Information [Line Items]      
Amortization of deferred policy acquisition costs ("DAC") $ 1,835 $ 1,680 $ 1,706
Operating Segments | P&C Commercial Lines      
Segment Reporting Information [Line Items]      
Amortization of deferred policy acquisition costs ("DAC") 1,563 1,398 1,397
Operating Segments | P&C Personal Lines      
Segment Reporting Information [Line Items]      
Amortization of deferred policy acquisition costs ("DAC") 228 230 244
Operating Segments | Group Benefits [Member]      
Segment Reporting Information [Line Items]      
Amortization of deferred policy acquisition costs ("DAC") 33 40 50
Operating Segments | Hartford Funds      
Segment Reporting Information [Line Items]      
Amortization of deferred policy acquisition costs ("DAC") 11 12 14
Corporate      
Segment Reporting Information [Line Items]      
Amortization of deferred policy acquisition costs ("DAC") $ 0 $ 0 $ 1