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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