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Business Dispositions - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Gain (Loss) on Disposition of Business | $ 51 | $ 51 |
Continental Europe Operations [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Disposal Group, Including Discontinued Operation, Consideration | 14 | 14 |
Gain (Loss) on Disposition of Business |  | (51) | $ 0
Disposal Group, Including Discontinued Operation, Deferred Tax Assets | 19 | 19 |
Discontinued Operation, Provision for Loss (Gain) on Disposal, Net of Tax | 32 |  |
Contingent Consideration Commission payable | 12 | $ 12 |
Net realized capital gains | Continental Europe Operations [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Gain (Loss) on Disposition of Business | $ 51 |  |

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