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Segment and Geographic Information - Geographic Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 1,589 | $ 1,513 | $ 1,509 | $ 1,453 | $ 1,399 | $ 1,439 | $ 1,482 | $ 1,341 | $ 6,063 | $ 5,661 | $ 5,313
Long-lived Assets | 4,734 |  |  |  | 4,780 |  |  |  | 4,734 | 4,780 |
U.S. |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 3,658 | 3,461 | 3,202
Long-lived Assets | 4,285 |  |  |  | 4,335 |  |  |  | 4,285 | 4,335 |
European region |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,473 | 1,330 | 1,265
Long-lived Assets | 346 |  |  |  | 341 |  |  |  | 346 | 341 |
Asia |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 594 | 575 | 566
Long-lived Assets | 54 |  |  |  | 58 |  |  |  | 54 | 58 |
Rest of the world |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 338 | 295 | $ 280
Long-lived Assets | $ 49 |  |  |  | $ 46 |  |  |  | $ 49 | $ 46 |
Geographic Concentration Risk | Revenue |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
Geographic Concentration Risk | Revenue | U.S. |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk |  |  |  |  |  |  |  |  | 60.00% | 61.00% | 60.00%
Geographic Concentration Risk | Revenue | European region |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk |  |  |  |  |  |  |  |  | 24.00% | 24.00% | 24.00%
Geographic Concentration Risk | Revenue | Asia |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk |  |  |  |  |  |  |  |  | 10.00% | 10.00% | 11.00%
Geographic Concentration Risk | Revenue | Rest of the world |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk |  |  |  |  |  |  |  |  | 6.00% | 5.00% | 5.00%
Geographic Concentration Risk | Long-lived Assets |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk |  |  |  |  |  |  |  |  | 100.00% | 100.00% |
Geographic Concentration Risk | Long-lived Assets | U.S. |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk |  |  |  |  |  |  |  |  | 91.00% | 91.00% |
Geographic Concentration Risk | Long-lived Assets | European region |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk |  |  |  |  |  |  |  |  | 7.00% | 7.00% |
Geographic Concentration Risk | Long-lived Assets | Asia |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk |  |  |  |  |  |  |  |  | 1.00% | 1.00% |
Geographic Concentration Risk | Long-lived Assets | Rest of the world |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk |  |  |  |  |  |  |  |  | 1.00% | 1.00% |

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