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DAC, VOBA, DSI, and DFEL (Estimated Future Amortization of VOBA) (Details) $ in Millions | Dec. 31, 2017 USD ($)
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Estimated future amortization of VOBA, net of interest [Abstract] |
2018 | $ 49
2019 | 51
2020 | 65
2021 | 65
2022 | $ 61

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