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Segment Information - Schedule of consolidated non-current assets by geographic area (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Noncurrent assets | $ 588 | $ 564
U.S. |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Noncurrent assets | 288 | 239
Americas other than U.S. |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Noncurrent assets | 44 | 47
United Kingdom |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Noncurrent assets | 58 | 68
Europe, Middle East, & Africa |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Noncurrent assets | 101 | 114
Asia Pacific |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Noncurrent assets | $ 97 | $ 96

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