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Financial investments and non-current prepayments (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of financial assets [line items]    
Financial investments $ 3,600 $ 2,455
Prepayments and financial receivables 1,214 1,033
Current Financial Assets 7,426 7,041
Bond Investment [Member]    
Disclosure of financial assets [line items]    
Financial investments 1,629 1,261
Listed equity securities [member]    
Disclosure of financial assets [line items]    
Financial investments 1,261 530
Non-listed equity securities [member]    
Disclosure of financial assets [line items]    
Financial investments 710 664
Financial receivables interest bearing [Member]    
Disclosure of financial assets [line items]    
Prepayments and financial receivables 413 345
Prepayments and other non-interest bearing receivables [Member]    
Disclosure of financial assets [line items]    
Prepayments and financial receivables 800 688
Time deposits [member]    
Disclosure of financial assets [line items]    
Current Financial Assets 4,158 4,129
Interest bearing securities [Member]    
Disclosure of financial assets [line items]    
Current Financial Assets 3,268 2,912
Investment portfolios [Member]    
Disclosure of financial assets [line items]    
Financial investments $ 377  
Current Financial Assets   $ 896