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Leases - Supplemental Balance Sheet Information Related to Leases (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Leases [Abstract]      
Operating lease right-of-use assets $ 200 $ 220  
Current portion of operating lease liabilities 46   $ 0
Non-current portion of operating lease liabilities 158    
Total operating lease liabilities 204 220  
Property, plant and equipment 28    
Accumulated depreciation (3)    
Property, plant and equipment, net 25    
Accrued liabilities 2 5  
Other non-current liabilities 11 $ 24  
Total finance lease liabilities $ 13    
Weighted average remaining lease term:      
Operating leases 9 years 10 months 24 days    
Finance leases 7 years 2 months 12 days    
Weighted average discount rate:      
Operating leases 4.30%    
Finance leases 3.90%