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Debt, cash and cash equivalents and lease liabilities - Summary of Debt by Currency (Details) - EUR (€) € in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Disclosure Of Debt By Currency [Line Items] |  |  |
Net debt | € 7,793 | € 6,437 | € 9,983
Value on redemption before derivative instruments |  |  |
Disclosure Of Debt By Currency [Line Items] |  |  |
Net debt | 7,881 |  |
Value on redemption after derivative instruments |  |  |
Disclosure Of Debt By Currency [Line Items] |  |  |
Net debt | 7,835 | 6,492 | 10,047
Euro | Value on redemption before derivative instruments |  |  |
Disclosure Of Debt By Currency [Line Items] |  |  |
Net debt | 10,113 |  |
Euro | Value on redemption after derivative instruments |  |  |
Disclosure Of Debt By Currency [Line Items] |  |  |
Net debt | 6,852 | 10,489 | 13,129
US dollar | Value on redemption before derivative instruments |  |  |
Disclosure Of Debt By Currency [Line Items] |  |  |
Net debt | (2,376) |  |
US dollar | Value on redemption after derivative instruments |  |  |
Disclosure Of Debt By Currency [Line Items] |  |  |
Net debt | 1,169 | (2,404) | (669)
Singapore dollar | Value on redemption before derivative instruments |  |  |
Disclosure Of Debt By Currency [Line Items] |  |  |
Net debt | (3) |  |
Singapore dollar | Value on redemption after derivative instruments |  |  |
Disclosure Of Debt By Currency [Line Items] |  |  |
Net debt | (1,143) |  |
Pound sterling | Value on redemption before derivative instruments |  |  |
Disclosure Of Debt By Currency [Line Items] |  |  |
Net debt | 0 |  |
Pound sterling | Value on redemption after derivative instruments |  |  |
Disclosure Of Debt By Currency [Line Items] |  |  |
Net debt | 509 |  |
Chinese yuan renminbi | Value on redemption before derivative instruments |  |  |
Disclosure Of Debt By Currency [Line Items] |  |  |
Net debt | (19) |  |
Chinese yuan renminbi | Value on redemption after derivative instruments |  |  |
Disclosure Of Debt By Currency [Line Items] |  |  |
Net debt | 189 |  |
Other currencies | Value on redemption before derivative instruments |  |  |
Disclosure Of Debt By Currency [Line Items] |  |  |
Net debt | 166 |  |
Other currencies | Value on redemption after derivative instruments |  |  |
Disclosure Of Debt By Currency [Line Items] |  |  |
Net debt | € 259 | € (1,593) | € (2,413)

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