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Restructuring of Operations - Additional Information (Details) $ in Millions		3 Months Ended
	Mar. 31, 2019 employee	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)
Restructuring and Related Activities [Abstract]
Restructuring charges		$ 9	$ 1
Reclassification of accrued lease cease-use costs after adopting new leasing standard		$ 4
Estimated reduction of employees | employee	300

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The expected number of positions to be eliminated as a result of restructuring activities.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Amount of increase (decrease) in the restructuring reserve related to foreign currency translation (gain) loss and other increases (decreases).

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