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Leases - Supplemental Balance Sheet Information (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Operating leases    
Other assets $ 83  
Accounts payable and accrued liabilities 31  
Other long-term liabilities 62  
Total operating lease liabilities 93  
Finance leases    
Property, equipment, and capitalized software, net 237  
Accounts payable and accrued liabilities 7  
Finance lease liabilities 234 $ 197
Total finance lease liabilities $ 241  
Weighted average remaining lease term    
Operating leases 4 years  
Finance leases 17 years  
Weighted average discount rate    
Operating leases 5.50%  
Finance leases 6.60%