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Description of Business and Significant Accounting Policies - Additional Information (Details) $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($) segment	Dec. 31, 2018 USD ($)
Product Information [Line Items]
Number of reportable segments | segment	1
Prepayments in Healthcare costs	$ 39	$ 33
Weighted-average rate used in discounting the lease liability	4.00%
Non-US | Revenue | Foreign Sales
Product Information [Line Items]
Percent of concentration risk	1.00%
Health Care [Member]
Product Information [Line Items]
Prepayments in Healthcare costs	$ 53	$ 50

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