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Business Dispositions - Additional Information (Details) - Continental Europe Operations [Member] - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Disposal Group, Including Discontinued Operation, Consideration | $ 12 | $ 12 | $ 12 | $ 14
Net realized capital gains |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Gain (Loss) on Disposition of Business | $ 19 | $ 18 | $ (66) |

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