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Non-current financial debt (Details 4) - 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
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 |

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