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Non-current and current financial debts - Schedule of financial debts (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
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Disclosure of detailed information about borrowings [line items] |  |
Total non-current financial debts | $ 3,986 | $ 3,949
Total current financial debts | 136 | 169
Total financial debts | 4,122 | 4,118
Facility B |  |
Disclosure of detailed information about borrowings [line items] |  |
Total non-current financial debts | 795 | 794
Facility C |  |
Disclosure of detailed information about borrowings [line items] |  |
Total non-current financial debts | 416 | 429
Local facilities (Japan) |  |
Disclosure of detailed information about borrowings [line items] |  |
Total non-current financial debts | 49 | 0
Total current financial debts | 75 | 101
Series 2026 notes |  |
Disclosure of detailed information about borrowings [line items] |  |
Total non-current financial debts | 496 | 496
Series 2029 notes |  |
Disclosure of detailed information about borrowings [line items] |  |
Total non-current financial debts | 992 | 992
Series 2030 notes |  |
Disclosure of detailed information about borrowings [line items] |  |
Total non-current financial debts | 744 | 744
Series 2049 notes |  |
Disclosure of detailed information about borrowings [line items] |  |
Total non-current financial debts | 494 | 494
Revolving facility |  |
Disclosure of detailed information about borrowings [line items] |  |
Total non-current financial debts | 0 | 0
Local facilities, all others |  |
Disclosure of detailed information about borrowings [line items] |  |
Total current financial debts | 37 | 49
Other short-term financial debts |  |
Disclosure of detailed information about borrowings [line items] |  |
Total current financial debts | 20 | 12
Derivatives |  |
Disclosure of detailed information about borrowings [line items] |  |
Total current financial debts | $ 4 | $ 7

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