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Leases - Supplemental Balance Sheet Information Related to Leases (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Jan. 01, 2019
Leases [Abstract]    
Operating lease right-of-use assets $ 213 $ 220
Current portion of operating lease liabilities 47  
Non-current portion of operating lease liabilities 167  
Total operating lease liabilities 214 220
Property and equipment, gross 28  
Accumulated depreciation (2)  
Property and equipment, net 26  
Accrued liabilities 2 5
Other non-current liabilities 13 $ 24
Total finance lease liabilities $ 15  
Weighted average remaining lease term    
Operating leases 9 years 7 months  
Finance leases 7 years 7 months  
Weighted average discount rate    
Operating leases 4.20%  
Finance leases 3.70%