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Description of Business and Significant Accounting Policies - Additional Information (Details) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 USD ($) segment | Dec. 31, 2018 USD ($)
Product Information [Line Items] |  |
Number of reportable segments | segment | 1 |
Prepaid Insurance | $ 39 | $ 33
Operating Lease, Weighted Average Discount Rate, Percent | 4.60% |
Non-US | Revenue | Foreign Sales |  |
Product Information [Line Items] |  |
Percent of concentration risk | 1.00% |
Health Care [Member] |  |
Product Information [Line Items] |  |
Prepaid Insurance | $ 51 | $ 50

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