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Description of Business and Significant Accounting Policies - Additional Information (Details) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) segment | Jan. 01, 2018 USD ($) | Dec. 31, 2017 USD ($)
Product Information [Line Items] |  |  |
Number of reportable segments | segment | 1 |  |
Retained earnings | $ (302) |  | $ (377)
ASU 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 |  |  |
Product Information [Line Items] |  |  |
Retained earnings | $ 14 | $ 1 |
Non-US | Revenue | Foreign Sales |  |  |
Product Information [Line Items] |  |  |
Percent of concentration risk | 1.00% |  |

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