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Right-of-use assets and Lease liabilities - Components of Right-of-Use Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of quantitative information about right-of-use assets [line items]    
Right-of-use assets $ 358 $ 324
Land [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Right-of-use assets 20 20
Buildings and improvements [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Right-of-use assets 310 277
Machinery & equipment and other assets [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Right-of-use assets $ 28 $ 27