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Deferred Policy Acquisition Costs (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |  |
Balance, beginning of period | $ 670 | $ 650 | $ 645
Deferred costs | 1,635 | 1,404 | 1,377
Amortization — DAC | (1,622) | (1,384) | (1,372)
Finite-Lived Intangible Assets, Accumulated Amortization | (299) | (132) |
Balance, end of period | 785 | 670 | 650
Customer Relationships [Member] |  |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |  |
Finite-Lived Intangible Assets, Accumulated Amortization | (92) | (49) |
The Navigators Group, Inc. [Member] | Customer Relationships [Member] |  |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |  |
Finite-Lived Intangible Assets, Accumulated Amortization | $ 102 | $ 0 | $ 0

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