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Basis of preparation and significant changes in the current reporting period - Additional information (Details) € in Millions | 1 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2024 EUR (€) | Jun. 30, 2024 EUR (€) country | Jun. 30, 2023 EUR (€) | Dec. 31, 2023 EUR (€) | Dec. 31, 2022 EUR (€)
Disclosure of significant accounting policies [line items] |  |  |  |  |  |
Reconciliation net result effect of adjustment after tax EU IAS 39 carve-out |  |  | € 1,099 | € (540) |  |
Total equity |  |  | € 55,505 | € 57,513 | € 55,628 | € 57,004
TLTRO |  |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |  |
Repayment of deposits from banks |  | € 6,000 |  |  |  |
Adjustment |  |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |  |
Total equity | [1] |  |  |  |  | € (46)
Minimum |  |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |  |
Number of countries in which entity operates | country |  |  | 40 |  |  |
[1] | Changes in policy following the adoption of IFRS 17 and change in policy for non-financial guarantees

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