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Non-current financial debt (Details 4) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Borrowings $ 28,531 $ 22,355
USD    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Borrowings 15,848 12,889
EUR    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Borrowings 10,888 7,861
JPY    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Borrowings 194 184
CHF    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Borrowings 1,563 $ 1,421
Others    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Borrowings $ 38