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Leases - Operating lease reconciliation (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Reconciliation of future undiscounted cash flows to the operating lease liabilities and the related ROU assets    
2020 (Excluding the six months ended June 30, 2020) $ 26  
2021 44  
2022 35  
2023 26  
2024 18  
Thereafter 34  
Total future lease payments 183  
Less imputed interest 27  
Present value of future lease payments 156  
Less current lease liabilities 41  
Non-current operating lease liabilities 115 $ 120
Operating lease assets $ 149 $ 151