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Segment Information - Non-insurance Revenue from Customers (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Segment Reporting Information [Line Items]      
Fee income $ 1,349 $ 1,488 $ 1,277
Other Income 73 81 126
Revenue from Contract with Customer, Excluding Assessed Tax 1,423 1,569 1,360
Installment billing fees [Member] | Operating Segments | P&C Commercial Lines      
Segment Reporting Information [Line Items]      
Fee income 39 34 30
Installment billing fees [Member] | Operating Segments | P&C Personal Lines      
Segment Reporting Information [Line Items]      
Fee income 30 32 34
Insurance servicing fees [Member] | Operating Segments | P&C Personal Lines      
Segment Reporting Information [Line Items]      
Other Income 73 80 81
Administrative services fees [Member] | Operating Segments | Group Benefits [Member]      
Segment Reporting Information [Line Items]      
Fee income 187 183 175
Advisor, distribution and other management fees [Member] | Operating Segments | Hartford Funds      
Segment Reporting Information [Line Items]      
Fee income 1,044 1,189 989
Investment management and other fees [Member] | Corporate      
Segment Reporting Information [Line Items]      
Fee income 49 50 49
Other | Corporate      
Segment Reporting Information [Line Items]      
Other Income $ 1 $ 1 $ 2