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Segment Information - Amortization of Deferred Policy Acquisition Costs (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |
Amortization of deferred policy acquisition costs (DAC) | $ 1,622 | $ 1,384 | $ 1,372
Property and Casualty, Commercial Insurance [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Amortization of deferred policy acquisition costs (DAC) | 1,296 | 1,048 | 1,009
Personal Lines |  |  |
Segment Reporting Information [Line Items] |  |  |
Amortization of deferred policy acquisition costs (DAC) | 259 | 275 | 309
Group Benefits |  |  |
Segment Reporting Information [Line Items] |  |  |
Amortization of deferred policy acquisition costs (DAC) | 54 | 45 | 33
Hartford Funds |  |  |
Segment Reporting Information [Line Items] |  |  |
Amortization of deferred policy acquisition costs (DAC) | 12 | 16 | 21
Corporate |  |  |
Segment Reporting Information [Line Items] |  |  |
Amortization of deferred policy acquisition costs (DAC) | $ 1 | $ 0 | $ 0

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