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Leases - Maturity of lease liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Jan. 01, 2019
Operating leases    
2019 $ 52  
2020 55  
2021 35  
2022 27  
2023 18  
2024 and thereafter 31  
Total lease payments 218  
Less: imputed interest (19)  
Total operating lease liabilities 199 $ 214
Finance leases    
2019 8  
2020 8  
2021 8  
2022 6  
2023 6  
2024 and thereafter 17  
Total lease payments 53  
Less: imputed interest (10)  
Total finance lease liabilities 43  
Minimum payments related to leases not yet commenced $ 85