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Financial instruments - Classes of financial assets instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Asset [abstract]      
Noncurrent Derivative Financial Assets $ 1,265 $ 2,476 $ 1,365
Non-current financial investments 3,346 4,083 3,600
Prepayments and financial receivables 1,087 861 1,214
Trade and other receivables 17,927 8,232 8,233
Current Derivative Financial Assets 5,131 886 578
Current financial investments 21,246 11,865  
Cash and cash equivalents 14,126 6,757 $ 5,177
Total 64,128 35,159  
Classification correction [Member]      
Asset [abstract]      
Prepayments and financial receivables   32  
Non-financial assets [member]      
Asset [abstract]      
Prepayments and financial receivables 380 396  
Trade and other receivables 736 814  
Total 1,116 1,210  
Amortised cost [member]      
Asset [abstract]      
Non-current financial investments 253 261  
Prepayments and financial receivables 707 465  
Trade and other receivables 17,192 7,418  
Current financial investments 20,946 11,649  
Cash and cash equivalents 11,412 6,264  
Total 50,510 26,057  
Financial assets at fair value through profit or loss, category [member]      
Asset [abstract]      
Noncurrent Derivative Financial Assets 1,265 2,476  
Non-current financial investments 3,093 3,822  
Current Derivative Financial Assets 5,131 886  
Current financial investments 300 216  
Cash and cash equivalents 2,714 492  
Total $ 12,503 $ 7,892