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Leases - Operating lease reconciliation (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Reconciliation of future undiscounted cash flows to the operating lease liabilities and the related ROU assets    
2021 (Excluding the three months ended March 31, 2021) $ 39  
2022 45  
2023 35  
2024 25  
2025 17  
Thereafter 53  
Total future lease payments 214  
Less imputed interest 24  
Present value of future lease payments 190  
Less current lease liabilities 45  
Non-current operating lease liabilities 145 $ 136
Operating lease assets $ 182 $ 173