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Right-of-use assets and Lease liabilities - Components of Right-of-Use Assets Depreciation (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Disclosure of quantitative information about right-of-use assets [line items]    
Depreciation, right-of-use assets $ 15 $ 29
Land [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Depreciation, right-of-use assets 0 1
Buildings [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Depreciation, right-of-use assets 10 19
Machinery & equipment and other assets [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Depreciation, right-of-use assets $ 5 $ 9