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Value of Business Acquired, Deferred Acquisition Costs and Deferred Sales Inducements - Estimated Amortization Expense for VOBA in Future Fiscal Periods (Detail)
$ in Millions
Sep. 30, 2021
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2021 $ (17)
2022 40
2023 165
2024 159
2025 153
Thereafter $ 956