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Summary of Significant Accounting Policies - Highly Inflationary Accounting (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Jun. 30, 2018
Foreign currency matters |  |
Charge related to the remeasurement | $ 2 |
Minimum |  |
Foreign currency matters |  |
Cumulative three-year inflation rate (as a percent) |  | 100.00%
Sales revenue, net | Geographic concentration risk | Argentina |  |
Foreign currency matters |  |
Concentration risk (as a percent) | 3.00% |

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