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Segment Information - Schedule of consolidated non-current assets by geographic area (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Noncurrent assets | $ 564 | $ 550
U.S. |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Noncurrent assets | 239 | 243
Americas other than U.S. |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Noncurrent assets | 47 | 60
United Kingdom |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Noncurrent assets | 68 | 65
Europe, Middle East, & Africa |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Noncurrent assets | 114 | 85
Asia Pacific |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Noncurrent assets | $ 96 | $ 97

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