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Leases - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended
Jan. 01, 2019
Mar. 31, 2019
Mar. 31, 2018
Range [Axis] [Line Items]      
Operating Lease, Weighted Average Remaining Lease Term   6 years  
Lease extension option 5 years    
Option to terminate period 1 year    
Operating lease expenses   $ 9 $ 7
Minimum [Member]      
Range [Axis] [Line Items]      
Operating Lease, Weighted Average Remaining Lease Term 1 year    
Maximum [Member]      
Range [Axis] [Line Items]      
Operating Lease, Weighted Average Remaining Lease Term 11 years