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Right-of-use assets and Lease liabilities - Components of Right-of-Use Assets (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets $ 266 $ 279 $ 79
Property, plant & equipment 2,887   2,800
Right-of-use assets, revaluation surplus   3  
Lease liability in excess of capital   10  
Previously stated [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Property, plant & equipment     $ 79
Land [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets 21 20  
Buildings [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets 217 226  
Machinery & equipment and other assets [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets $ 28 $ 33