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Basis of Financial Statements -Management Estimates (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Future policy reserves | $ (3,985) | $ (4,010) |  |
Intangibles assets | (1,891) | $ (1,724) | $ (1,762) | $ 0
Change in Accounting Method Accounted for as Change in Estimate |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Future policy reserves | 425 |  |  |
Intangibles assets | 136 |  |  |
Liability for guaranteed minimum withdrawal benefit | $ 28 |  |  |

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