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Non-current financial debt (Details 3) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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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

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