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Leases - Maturity of lease liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Jan. 01, 2019
Operating leases    
2019 $ 19  
2020 64  
2021 40  
2022 30  
2023 19  
2024 and thereafter 32  
Total lease payments 204  
Less: imputed interest (18)  
Total operating lease liabilities 186 $ 214
Finance leases    
2019 2  
2020 9  
2021 8  
2022 8  
2023 7  
2024 and thereafter 19  
Total lease payments 53  
Less: imputed interest (10)  
Total finance lease liabilities 43  
Minimum payments related to leases not yet commenced $ 130