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Risk management - Notional amounts of hedging instruments (Details) € in Millions | 12 Months Ended
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Dec. 31, 2024 EUR (€) | Dec. 31, 2023 EUR (€)
Disclosure of detailed information about financial instruments [line items] |  |
Nominal amount of hedging instrument | 110,189,000,000 | 77,388,000,000
WIBOR | Maturity Beyond December December 2027 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Percentage of notional amounts of hedging instruments | 32.00% | 29.00%
Polish Zloty | WIBOR Indexed Fair Value And Cash Flow Hedges [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Nominal amount of hedging instrument | 99,663 | 89,338

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- Definition The nominal amount of a hedging instrument. [Refer: Hedging instruments [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 23B -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_23B_a&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 24A -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_24A_d&doctype=Standard -URIDate 2024-03-27 + Details
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