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Derivative financial instruments and market risks - Disclosure of Actual or Potential Effects of Netting Arrangements (Details) - EUR (€) € in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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Derivative financial assets |  |  |
Disclosure of Offsetting of Financial Assets and Liabilities [line items] |  |  |
Gross carrying amounts before offset | € 217 | € 201 | € 206
Gross amounts offset (in accordance with IAS 32) | 0 | 0 | 0
Net amounts as reported in the balance sheet | 217 | 201 | 206
Net exposure | 16 | 30 | 46
Derivative financial assets | Effects of other netting arrangements not fulfilling the IAS 32 criteria for offsetting |  |  |
Disclosure of Offsetting of Financial Assets and Liabilities [line items] |  |  |
Fair value of financial collateral |  |  |
Financial instruments | (201) | (171) | (160)
Derivative financial liabilities |  |  |
Disclosure of Offsetting of Financial Assets and Liabilities [line items] |  |  |
Gross carrying amounts before offset | (458) | (291) | (326)
Gross amounts offset (in accordance with IAS 32) | 0 | 0 | 0
Net amounts as reported in the balance sheet | (458) | (291) | (326)
Net exposure | (257) | (120) | (166)
Derivative financial liabilities | Effects of other netting arrangements not fulfilling the IAS 32 criteria for offsetting |  |  |
Disclosure of Offsetting of Financial Assets and Liabilities [line items] |  |  |
Fair value of financial collateral |  |  |
Financial instruments | € 201 | € 171 | € 160

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