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Leases - Supplemental lease balance sheet information (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Leases    
Non-current operating lease assets $ 176 $ 176
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Non-current operating lease assets  
Finance $ 5 5
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Property, Plant and Equipment, Net.  
Total leased assets $ 181 181
Current operating lease liabilities $ 41 40
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Current operating lease liabilities  
Operating lease liability, non current $ 172 173
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Operating lease liability, non current  
Finance lease liability, current $ 2 2
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] Other Liabilities, Current  
Finance lease liability, non current $ 1 1
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Other Liabilities, Noncurrent  
Total leased Liabilities $ 216 $ 216