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Leases - Schedule of Maturities of Operating and Finance Leases Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Operating Leases      
2019 $ 35   $ 54
2020 43   42
2021 33   34
2022 25   26
2023 20   21
Thereafter 114   117
Total lease payments 270   294
Less imputed interest (58)    
Total operating lease liabilities 212 $ 220  
Finance Lease, Liability, Payment, Due [Abstract]      
2019 2   5
2020 3   5
2021 2   5
2022 2   4
2023 2   4
Thereafter 6   6
Total lease payments 17   $ 29
Less imputed interest (2)    
Total finance lease liabilities $ 15