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Non-current financial debt (Details 5) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of fair value measurement of liabilities [line items]    
Straight bonds $ 28,298 $ 22,167
Total 28,531 22,355
Balance sheet    
Disclosure of fair value measurement of liabilities [line items]    
Straight bonds 28,298 22,167
Others 233 188
Total 28,531 22,355
Fair values    
Disclosure of fair value measurement of liabilities [line items]    
Straight bonds 31,359 23,701
Others 233 188
Total $ 31,592 $ 23,889