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Value of Business Acquired, Deferred Acquisition Costs and Deferred Sales Inducements - Narrative (Detail) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020
VOBA |  |
Finite-Lived Intangible Assets [Line Items] |  |
Adjustment for net unrealized investment gains | $ (298) | $ (101)
VOBA | Minimum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Interest accrual rate utilized to calculate accretion of interest | 0.00% |
VOBA | Maximum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Interest accrual rate utilized to calculate accretion of interest | 4.71% |
DAC |  |
Finite-Lived Intangible Assets [Line Items] |  |
Adjustment for net unrealized investment gains | $ (53) | (8)
Deferred sales inducement, unrealized investment gains | $ (10) | $ (2)

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