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Discontinued Operations (Details) £ in Millions, $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 USD ($) | Jan. 10, 2018 USD ($) | Jan. 10, 2018 GBP (£)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Tax payment related to income recognized in 2017 from a prior disposition | $ 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

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