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Lease liability and Right-of-use assets (Details 2) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2019
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets $ 1,676 $ 1,677 $ 1,554
Depreciation charge (330) (305)  
Land [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets 528 537  
Depreciation charge (11) (14)  
Buildings [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets 963 990  
Depreciation charge (207) (194)  
Vehicles [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets 155 129  
Depreciation charge (100) (87)  
Machinery & equipment and other assets      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets 30 21  
Depreciation charge $ (12) $ (10)