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Financial instruments - Classes of financial assets instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Asset [abstract]          
Noncurrent Derivative Financial Assets $ 1,365   $ 1,032    
Non-current financial investments 3,600   2,455    
Prepayments and financial receivables 1,214 $ 1,085 1,033    
Trade and other receivables 8,233 $ 9,043 8,998    
Current Derivative Financial Assets 578   318    
Current financial investments 7,426   7,041    
Cash and cash equivalents 5,177   7,556 $ 4,390 $ 5,090
Total 27,593   28,433    
Non-financial assets [member]          
Asset [abstract]          
Noncurrent Derivative Financial Assets 0   0    
Non-current financial investments 0   0    
Prepayments and financial receivables 157   179    
Trade and other receivables 859   510    
Current Derivative Financial Assets 0   0    
Current financial investments 0   0    
Cash and cash equivalents 0   0    
Total 1,016   689    
Amortised cost [member]          
Asset [abstract]          
Noncurrent Derivative Financial Assets 0   0    
Non-current financial investments 167   90    
Prepayments and financial receivables 1,057   854    
Trade and other receivables 7,374   8,488    
Current Derivative Financial Assets 0   0    
Current financial investments 7,050   6,145    
Cash and cash equivalents 4,478   5,301    
Total 20,125   20,878    
Financial assets at fair value through profit or loss, category [member]          
Asset [abstract]          
Noncurrent Derivative Financial Assets 1,365   1,032    
Non-current financial investments 3,433   2,365    
Prepayments and financial receivables 0   0    
Trade and other receivables 0   0    
Current Derivative Financial Assets 578   318    
Current financial investments 377   896    
Cash and cash equivalents 700   2,255    
Total $ 6,452   $ 6,866