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Leases - Operating lease reconciliation (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Jan. 01, 2019
Reconciliation of future undiscounted cash flows to the operating lease liabilities and the related ROU assets    
2020 $ 49  
2021 39  
2022 30  
2023 23  
2024 15  
Thereafter 33  
Total future lease payments 189  
Less imputed interest 28  
Present value of future lease payments 161  
Less current lease liabilities 41  
Non-current operating lease liabilities 120  
Operating lease assets $ 151  
Operating lease assets and liabilities    
Operating Lease, Liability, Statement of Financial Position us-gaap:AccruedLiabilitiesCurrent us-gaap:OperatingLeaseLiabilityNoncurrent us-gaap:AccruedLiabilitiesCurrent us-gaap:OperatingLeaseLiabilityNoncurrent
Operating Lease, Liability, Current, Statement of Financial Position us-gaap:AccruedLiabilitiesCurrent  
ASU 2016-02, Leases | Adjustment    
Reconciliation of future undiscounted cash flows to the operating lease liabilities and the related ROU assets    
Present value of future lease payments   $ 170
Operating lease assets   $ 161