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Right-of-use assets and Lease liabilities - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of maturity analysis of operating lease payments [line items]      
Depreciation of right-of-use assets $ 79 $ 66 $ 0
Additions to right-of-use assets 107 116  
Lease liabilities 385 341  
Current lease liabilities 70 61  
Non-current lease liabilities $ 315 $ 280