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Equity - Other reserves additional information (Details) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of equity [Line Items] |  |  |
Unrealised revaluations and exchange rate differences, net | € (132) |  |
US Dollar |  |  |
Disclosure of equity [Line Items] |  |  |
Unrealised revaluations and exchange rate differences, net | (238) |  |
Turkish Lira |  |  |
Disclosure of equity [Line Items] |  |  |
Unrealised revaluations and exchange rate differences, net | 11 |  |
Indexation effect | 284 |  |
GBP |  |  |
Disclosure of equity [Line Items] |  |  |
Unrealised revaluations and exchange rate differences, net | 18 |  |
Polish Zloty |  |  |
Disclosure of equity [Line Items] |  |  |
Unrealised revaluations and exchange rate differences, net | 169 |  |
CHF |  |  |
Disclosure of equity [Line Items] |  |  |
Unrealised revaluations and exchange rate differences, net | 37 |  |
Australian Dollar |  |  |
Disclosure of equity [Line Items] |  |  |
Unrealised revaluations and exchange rate differences, net | (42) |  |
Russian Rouble |  |  |
Disclosure of equity [Line Items] |  |  |
Unrealised revaluations and exchange rate differences, net | (70) |  |
Thai Baht |  |  |
Disclosure of equity [Line Items] |  |  |
Unrealised revaluations and exchange rate differences, net | (13) |  |
Chinese Yuan |  |  |
Disclosure of equity [Line Items] |  |  |
Unrealised revaluations and exchange rate differences, net | (16) |  |
Other currency |  |  |
Disclosure of equity [Line Items] |  |  |
Unrealised revaluations and exchange rate differences, net | 11 |  |
Reserve of cash flow hedges |  |  |
Disclosure of equity [Line Items] |  |  |
Unrealised revaluations | 997 | € (2,901) | € (1,603)
Equity securities | Reserve of gain loss FVOCI |  |  |
Disclosure of equity [Line Items] |  |  |
Unrealised revaluations | (35) | (118) | 94
Equity securities | Reserve of gain loss FVOCI | Bank Of Beijing |  |  |
Disclosure of equity [Line Items] |  |  |
Unrealised revaluations | € (24) | € (86) | € 38

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