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Leases - Schedule of Information About Company's Operating Leases (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Maturity of Lease Liabilities    
2019 (remaining) $ 29  
2020 61  
2021 53  
2022 46  
2023 38  
Thereafter 1,241  
Total undiscounted operating lease payments 1,468  
Less: Imputed interest (908)  
Present value of operating lease liabilities 560  
Balance Sheet Classification    
Current lease liabilities (recorded in other current liabilities) 59  
Long-term lease liabilities 501 $ 0
Total operating lease liabilities $ 560  
Other Information    
Weighted-average remaining lease term for operating leases 33 years  
Weighted-average discount rate for operating leases 5.00%