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Leases Lessee arrangements - Maturity of lease liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity    
Remaining six months of 2019 $ 102  
2020 164  
2021 122  
2022 76  
2023 58  
Thereafter 196  
Total lease payments 718  
Less: Imputed interest (51)  
Total $ 667  
2019   $ 205
2020   154
2021   111
2022   67
2023   50
Thereafter   185
Total   $ 772