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DAC, VOBA, DSI, and DFEL (DAC) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Changes in DAC [Roll Forward] |  |  |
Balance as of beginning-of-year | $ 8,243 | $ 8,617 | $ 7,558
Business acquired (sold) through reinsurance |  |  | 38
Deferrals | 1,348 | 1,344 | 1,490
Amortization, net of interest: |  |  |
Amortization, excluding unlocking, net of interest | (965) | (981) | (879)
Unlocking | 61 | (276) | (238)
Adjustment related to realized (gains) losses | (12) | 22 | (15)
Adjustment related to unrealized (gains) losses | (788) | (483) | 663
Balance as of end-of-year | $ 7,887 | $ 8,243 | $ 8,617

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