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Principal changes in the scope of consolidation in 2021 and 2020 - Summary of Purchase Price Allocation (Details) - EUR (€) € in Millions | Sep. 14, 2021 | Sep. 28, 2020 | Jan. 23, 2020
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Translate Bio |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Other intangible assets | € 396 |  |
Deferred tax liabilities | (93) |  |
Other current and non-current assets and liabilities | 235 |  |
Cash and cash equivalents | 247 |  |
Shire contingent consideration liability (see Note D.18.) | (323) |  |
Net assets of Translate Bio | 462 |  |
Goodwill | 2,118 |  |
Purchase price | € 2,580 |  |
Principia |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Other intangible assets |  | € 2,534 |
Deferred tax liabilities |  | (436) |
Other current and non-current assets and liabilities |  | (38) |
Cash and cash equivalents |  | 186 |
Net assets of Translate Bio |  | 2,246 |
Goodwill |  | 912 |
Purchase price |  | € 3,158 |
Synthorx |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Other intangible assets |  |  | € 1,549
Deferred tax liabilities |  |  | (269)
Other current and non-current assets and liabilities |  |  | 36
Net assets of Translate Bio |  |  | 1,316
Goodwill |  |  | 930
Purchase price |  |  | € 2,246

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