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Right-of-use assets and Lease liabilities - Components of Right-of-Use Assets Depreciation (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of quantitative information about right-of-use assets [line items]    
Depreciation of right-of-use assets $ 66 $ 0
Land [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Depreciation of right-of-use assets 1  
Buildings [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Depreciation of right-of-use assets 47  
Machinery & equipment and other assets [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Depreciation of right-of-use assets $ 18