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Discontinued Operations (Details) £ in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jan. 10, 2018 USD ($) | Jan. 10, 2018 GBP (£) | May 11, 2017 USD ($)
Discontinued Operations, Held-for-sale or Disposed of by Sale |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Income from discontinued operations |  | $ 19 |  |  |
Income from discontinued operations, tax | $ (7) | $ (7) |  |  |
Discontinued Operations, Disposed of by Sale |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Consideration from sale of business |  |  | $ 50 | £ 37 | $ 17
Discontinued Operations, Held-for-sale |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Discontinued operation, corresponding assets | $ 50 |  |  |  |

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