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Value of Business Acquired, Deferred Acquisition Costs and Deferred Sales Inducements - Narrative (Detail) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020
Finite-Lived Intangible Assets [Line Items] |  |
Amortization | $ 436 | $ 61
VOBA |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortization | 376 | 56
Adjustment for net unrealized investment gains | $ 245 | 228
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] |  |
Amortization | $ 34 | 3
Adjustment for net unrealized investment gains | 44 | 15
Deferred sales inducement, unrealized investment gains | 6 | $ 4
Change in Accounting Method Accounted for as Change in Estimate |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortization | $ 136 |

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- Definition Amount of amortization expense (reversal of expense) for deferred policy acquisition costs and present value of future profits from insurance contract acquired in business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section S99 -Paragraph 2 -Subparagraph (2) -URI http://asc.fasb.org/extlink&oid=122135039&loc=d3e569990-122904 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35755530&loc=d3e11264-158415 + Details
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