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Segment Information - Amortization of Deferred Policy Acquisition Costs (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Segment Reporting Information [Line Items] |  |  |
Amortization of deferred policy acquisition costs ("DAC") | $ 1,680 | $ 1,706 | $ 1,622
Operating Segments | P&C Commercial Lines |  |  |
Segment Reporting Information [Line Items] |  |  |
Amortization of deferred policy acquisition costs ("DAC") | 1,398 | 1,397 | 1,296
Operating Segments | P&C Personal Lines |  |  |
Segment Reporting Information [Line Items] |  |  |
Amortization of deferred policy acquisition costs ("DAC") | 230 | 244 | 259
Operating Segments | Group Benefits [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Amortization of deferred policy acquisition costs ("DAC") | 40 | 50 | 54
Operating Segments | Hartford Funds |  |  |
Segment Reporting Information [Line Items] |  |  |
Amortization of deferred policy acquisition costs ("DAC") | 12 | 14 | 12
Corporate |  |  |
Segment Reporting Information [Line Items] |  |  |
Amortization of deferred policy acquisition costs ("DAC") | $ 0 | $ 1 | $ 1

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