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Non-current financial debt (Details 3) - 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
Not later than one year [member]
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Borrowings	2,272	2,002
Later than one year and not later than two years [member]
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Borrowings	2,631	2,067
Later than two years and not later than three years [member]
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Borrowings	2,546	2,583
Later than three years and not later than four years [member]
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Borrowings	2,142	2,321
Later than four years and not later than five years [member]
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Borrowings	3,302	2,139
Later than five years and not later than six years [member]
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Borrowings		2,252
Later than five years [member]
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Borrowings	$ 15,638
Later than six years [member]
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Borrowings		$ 8,991