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Financial instruments - additional disclosures (Details 4) - Contract or underlying principal amout [member] - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of derivative financial instruments [line items]    
Derivative financial instruments $ 13,760 $ 11,057
EUR    
Disclosure of derivative financial instruments [line items]    
Derivative financial instruments 2,432 1,373
USD    
Disclosure of derivative financial instruments [line items]    
Derivative financial instruments 6,457 8,019
Others    
Disclosure of derivative financial instruments [line items]    
Derivative financial instruments 4,871 1,665
Derivative financial instruments, at fair value currency related [member]    
Disclosure of derivative financial instruments [line items]    
Derivative financial instruments, forward foreign exchange rate contracts 13,679 10,779
Derivative financial instruments, commodity purchase contract 11 9
Derivative financial instruments, options on equity securities 70 269
Derivative financial instruments, at fair value currency related [member] | EUR    
Disclosure of derivative financial instruments [line items]    
Derivative financial instruments, forward foreign exchange rate contracts 2,432 1,373
Derivative financial instruments, at fair value currency related [member] | USD    
Disclosure of derivative financial instruments [line items]    
Derivative financial instruments, forward foreign exchange rate contracts 6,376 7,760
Derivative financial instruments, commodity purchase contract 11 9
Derivative financial instruments, options on equity securities 70 250
Derivative financial instruments, at fair value currency related [member] | Others    
Disclosure of derivative financial instruments [line items]    
Derivative financial instruments, forward foreign exchange rate contracts $ 4,871 1,646
Derivative financial instruments, options on equity securities   $ 19