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DAC, VOBA, DSI, and DFEL (DAC) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Changes in DAC [Roll Forward] |  |  |
Balance as of beginning-of-year | $ 5,565 | $ 7,352 | $ 9,448
Business acquired (sold) through reinsurance | (362) | (10) |
Deferrals | 1,373 | 1,446 | 1,902
Amortization, net of interest: |  |  |
Amortization, excluding unlocking, net of interest | (1,001) | (796) | (950)
Unlocking | (565) | (231) | (489)
Adjustment related to realized gains (losses) | 86 | (19) | 54
Adjustment related to unrealized gains (losses) | 792 | (2,182) | (2,613)
Balance as of end-of-year | 5,888 | 5,565 | $ 7,352
Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |
Changes in DAC [Roll Forward] |  |  |
Balance as of beginning-of-year | $ 5 |  |
Amortization, net of interest: |  |  |
Balance as of end-of-year |  | $ 5 |

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