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Segment Information - Amortization of Deferred Policy Acquisition Costs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]      
Amortization of deferred policy acquisition costs (DAC) $ 1,384 $ 1,372 $ 1,377
Property and Casualty, Commercial Insurance Product Line [Member]      
Segment Reporting Information [Line Items]      
Amortization of deferred policy acquisition costs (DAC) 1,048 1,009 973
Personal Lines      
Segment Reporting Information [Line Items]      
Amortization of deferred policy acquisition costs (DAC) 275 309 348
Group Benefits      
Segment Reporting Information [Line Items]      
Amortization of deferred policy acquisition costs (DAC) 45 33 31
Hartford Funds      
Segment Reporting Information [Line Items]      
Amortization of deferred policy acquisition costs (DAC) 16 21 24
Corporate      
Segment Reporting Information [Line Items]      
Amortization of deferred policy acquisition costs (DAC) $ 0 $ 0 $ 1