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Financial instruments - Classes of financial assets instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Asset [abstract]        
Noncurrent Derivative Financial Assets $ 2,476 $ 1,365    
Non-current financial investments 4,083 3,600    
Prepayments and financial receivables 861 1,214    
Trade and other receivables 8,232 8,233    
Current Derivative Financial Assets 886 578    
Current financial investments 11,865 7,426    
Cash and cash equivalents 6,757 5,177 $ 7,556 $ 4,390
Total 35,159 27,593    
Non-financial assets [member]        
Asset [abstract]        
Non-current financial investments 0      
Prepayments and financial receivables 364 157    
Trade and other receivables 814 859    
Total 1,178 1,016    
Amortised cost [member]        
Asset [abstract]        
Non-current financial investments 261 167    
Prepayments and financial receivables 497 1,057    
Trade and other receivables 7,418 7,374    
Current financial investments 11,649 7,050    
Cash and cash equivalents 6,264 4,478    
Total 26,090 20,125    
Financial assets at fair value through profit or loss, category [member]        
Asset [abstract]        
Noncurrent Derivative Financial Assets 2,476 1,365    
Non-current financial investments 3,822 3,433    
Current Derivative Financial Assets 886 578    
Current financial investments 216 377    
Cash and cash equivalents 492 700    
Total $ 7,892 $ 6,452