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Leases - Operating lease reconciliation (Details)
$ in Millions
Mar. 31, 2019
USD ($)
Reconciliation of future undiscounted cash flows to the operating lease liabilities and the related ROU assets  
2019 (Excluding the three months ended March 31, 2019) $ 41
2020 43
2021 32
2022 23
2023 18
Thereafter 33
Total future lease payments 190
Less imputed interest 35
Present value of future lease payments 155
Less current lease liabilities 42
Non-current operating lease liabilities 113
Operating lease assets $ 146