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Significant accounting policies (Details 2) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Apr. 08, 2019
Jan. 01, 2019
Non-current assets [abstract]        
Property, plant and equipment $ 12,263 $ 12,069    
Right-of-use assets 1,676 1,677   $ 1,554
Equity [abstract]        
Reserves 55,738 54,618    
Current liabilities [abstract]        
Current lease liabilities $ 286 $ 246    
Increase (decrease) due to changes in accounting policy, IFRS 16 [member]        
Non-current assets [abstract]        
Property, plant and equipment       (101)
Equity [abstract]        
Reserves       3
Current liabilities [abstract]        
Current lease liabilities       268
Discontinued operations [member]        
Non-current assets [abstract]        
Property, plant and equipment     $ 2,858  
Right-of-use assets     $ 269 276
Discontinued operations [member] | Previously stated [member]        
Non-current assets [abstract]        
Right-of-use assets       $ 75