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Details of treasury and other financial risks - Estimated impact of 10% increase of value of the EUR on the fair value of hedges (Detail) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Details of treasury and other financial risks [Line Items] |  |
Change in the value of transactional hedges following a 10% increase in the value of a currency against EUR | € (136) |
US Dollar [Member] |  |
Details of treasury and other financial risks [Line Items] |  |
Change in the value of transactional hedges following a 10% increase in the value of a currency against EUR | (71) | € (85)
Yen [Member] |  |
Details of treasury and other financial risks [Line Items] |  |
Change in the value of transactional hedges following a 10% increase in the value of a currency against EUR | (17) | (19)
Pound Sterling [Member] |  |
Details of treasury and other financial risks [Line Items] |  |
Change in the value of transactional hedges following a 10% increase in the value of a currency against EUR | (15) | (14)
Swiss Franc [Member] |  |
Details of treasury and other financial risks [Line Items] |  |
Change in the value of transactional hedges following a 10% increase in the value of a currency against EUR | (6) | (5)
Zloty [Member] |  |
Details of treasury and other financial risks [Line Items] |  |
Change in the value of transactional hedges following a 10% increase in the value of a currency against EUR | (8) | (9)
RUB [member] |  |
Details of treasury and other financial risks [Line Items] |  |
Change in the value of transactional hedges following a 10% increase in the value of a currency against EUR | € (8) | € (3)

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