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Description of Business and Significant Accounting Policies - Additional Information (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($) segment	Jan. 01, 2018 USD ($)	Dec. 31, 2017 USD ($)
Product Information [Line Items]
Retained earnings	$ (332)		$ (377)
Number of reportable segments | segment	1
Contract costs capitalized	$ 9
Amortization of capitalized contract costs	1
ASU 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606
Product Information [Line Items]
Retained earnings	$ 10	$ 1
Non-US | Revenue | Foreign Sales
Product Information [Line Items]
Percent of concentration risk	1.00%

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