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Financial and capital risk management - Financial instruments, except for accounts receivable (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of external credit grades [line items]    
Financial assets $ 22,632 $ 17,106
Cash and cash equivalents    
Disclosure of external credit grades [line items]    
Financial assets 13,487 7,350
Short-term investments    
Disclosure of external credit grades [line items]    
Financial assets 771 826
Restricted cash    
Disclosure of external credit grades [line items]    
Financial assets 38 151
Judicial deposits    
Disclosure of external credit grades [line items]    
Financial assets 1,268 3,133
Derivative financial instruments (note 19)    
Disclosure of external credit grades [line items]    
Financial assets 200 472
Investments in equity securities    
Disclosure of external credit grades [line items]    
Financial assets 757 726
Related parties    
Disclosure of external credit grades [line items]    
Financial assets 1,118 1,919
Financial instruments, except for accounts receivable    
Disclosure of external credit grades [line items]    
Financial assets $ 17,639 $ 14,577