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DAC, VOBA, DSI, and DFEL (DAC) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Changes in DAC [Roll Forward] |  |  |
Balance as of beginning-of-year | $ 9,448 | $ 7,887 | $ 8,243
Business acquired (sold) through reinsurance |  | (246) |
Deferrals | 1,902 | 1,600 | 1,348
Amortization, net of interest: |  |  |
Amortization, excluding unlocking, net of interest | (950) | (951) | (965)
Unlocking | (489) | (115) | 61
Adjustment related to realized gains (losses) | 54 | (47) | (12)
Adjustment related to unrealized gains (losses) | (2,613) | 1,320 | (788)
Balance as of end-of-year | $ 7,352 | $ 9,448 | $ 7,887

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