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Hedging derivatives - Schedule of details of hedged exposure/hedged items (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Disclosure of detailed information about hedged items [line items] |  |  |
Carrying amount of hedged items - Assets | € 186,573 | € 162,465 | € 152,801
Carrying amount of hedged items - Liabilities | 107,124 | 32,642 | 26,946
Accumulated amount of fair value adjustments on the hedged item - Assets | (191) | (1,412) | (1,798)
Accumulated amount of fair value adjustments on the hedged item - Liabilities | 490 | (1,200) | (1,652)
Change in fair value of hedged item for ineffectiveness assessment | (738) | (1,445) | 1,992
Cash flow hedge/currency translation reserve - Continuing hedges | (7,466) | (8,480) | (9,497)
Cash flow hedge/currency translation reserve- Discontinued hedges | 237 | 50 | (173)
Fair value hedges |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Carrying amount of hedged items - Assets | 166,907 | 138,906 | 134,095
Carrying amount of hedged items - Liabilities | 107,124 | 32,642 | 26,946
Accumulated amount of fair value adjustments on the hedged item - Assets | (191) | (1,412) | (1,798)
Accumulated amount of fair value adjustments on the hedged item - Liabilities | 490 | (1,200) | (1,652)
Change in fair value of hedged item for ineffectiveness assessment | 461 | (461) | 1,928
Cash flow hedge/currency translation reserve - Continuing hedges | 0 | 0 |
Cash flow hedge/currency translation reserve- Discontinued hedges | 0 | 0 | 0
Fair value hedges | Interest rate risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Carrying amount of hedged items - Assets | 152,380 | 133,149 | 130,672
Carrying amount of hedged items - Liabilities | 93,395 | 23,780 | 19,176
Accumulated amount of fair value adjustments on the hedged item - Assets | (201) | (1,345) | (1,682)
Accumulated amount of fair value adjustments on the hedged item - Liabilities | 364 | (1,176) | (1,546)
Change in fair value of hedged item for ineffectiveness assessment | 400 | (343) | 1,757
Cash flow hedge/currency translation reserve - Continuing hedges | 0 | 0 | 0
Cash flow hedge/currency translation reserve- Discontinued hedges | 0 | 0 | 0
Fair value hedges | Currency risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Carrying amount of hedged items - Assets | 2,154 | 2,017 | 637
Carrying amount of hedged items - Liabilities | 242 | 1,562 | 1,365
Accumulated amount of fair value adjustments on the hedged item - Assets | (6) | 1 | (1)
Accumulated amount of fair value adjustments on the hedged item - Liabilities | 0 | 3 | (3)
Change in fair value of hedged item for ineffectiveness assessment | (43) | (118) | 60
Cash flow hedge/currency translation reserve - Continuing hedges | 0 | 0 | 0
Cash flow hedge/currency translation reserve- Discontinued hedges | 0 | 0 | 0
Fair value hedges | Interest rate and exchange rate risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Carrying amount of hedged items - Assets | 9,619 | 3,238 | 2,786
Carrying amount of hedged items - Liabilities | 13,487 | 7,205 | 6,405
Accumulated amount of fair value adjustments on the hedged item - Assets | 3 | (68) | (115)
Accumulated amount of fair value adjustments on the hedged item - Liabilities | 126 | (27) | (103)
Change in fair value of hedged item for ineffectiveness assessment | 66 | 1 | 111
Cash flow hedge/currency translation reserve - Continuing hedges | 0 | 0 | 0
Cash flow hedge/currency translation reserve- Discontinued hedges | 0 | 0 | 0
Fair value hedges | Inflation risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Carrying amount of hedged items - Assets | 2,253 | 0 | 0
Carrying amount of hedged items - Liabilities | 0 | 0 | 0
Accumulated amount of fair value adjustments on the hedged item - Assets | 13 | 0 | 0
Accumulated amount of fair value adjustments on the hedged item - Liabilities | 0 | 0 | 0
Change in fair value of hedged item for ineffectiveness assessment | 38 | 0 | 0
Cash flow hedge/currency translation reserve - Continuing hedges | 0 | 0 | 0
Cash flow hedge/currency translation reserve- Discontinued hedges | 0 | 0 | 0
Fair value hedges | Credit risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Carrying amount of hedged items - Assets | 0 | 0 | 0
Carrying amount of hedged items - Liabilities | 0 | 0 | 0
Accumulated amount of fair value adjustments on the hedged item - Assets | 0 | 0 | 0
Accumulated amount of fair value adjustments on the hedged item - Liabilities | 0 | 0 | 0
Change in fair value of hedged item for ineffectiveness assessment | 0 | 0 | 0
Cash flow hedge/currency translation reserve - Continuing hedges | 0 | 0 | 0
Cash flow hedge/currency translation reserve- Discontinued hedges | 0 | 0 | 0
Fair value hedges | Base risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Carrying amount of hedged items - Assets | 501 | 502 |
Carrying amount of hedged items - Liabilities | 0 | 0 |
Accumulated amount of fair value adjustments on the hedged item - Assets | 0 | 0 |
Accumulated amount of fair value adjustments on the hedged item - Liabilities | 0 | 0 |
Change in fair value of hedged item for ineffectiveness assessment | 0 | 0 |
Cash flow hedge/currency translation reserve - Continuing hedges | 0 | 0 |
Cash flow hedge/currency translation reserve- Discontinued hedges | 0 | 0 |
Fair value hedges | Equities |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Carrying amount of hedged items - Assets | 0 | 0 |
Carrying amount of hedged items - Liabilities | 0 | 95 |
Accumulated amount of fair value adjustments on the hedged item - Assets | 0 | 0 |
Accumulated amount of fair value adjustments on the hedged item - Liabilities | 0 | 0 |
Change in fair value of hedged item for ineffectiveness assessment | 0 | (1) |
Cash flow hedge/currency translation reserve - Continuing hedges | 0 | 0 |
Cash flow hedge/currency translation reserve- Discontinued hedges | 0 | 0 |
Cash flow hedges |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Change in fair value of hedged item for ineffectiveness assessment | (1,063) | (564) | (1,824)
Cash flow hedge/currency translation reserve - Continuing hedges | 401 | (478) | (813)
Cash flow hedge/currency translation reserve- Discontinued hedges | 235 | 50 | (173)
Cash flow hedges | Interest rate risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Change in fair value of hedged item for ineffectiveness assessment | (1,174) | (156) | (2,182)
Cash flow hedge/currency translation reserve - Continuing hedges | 381 | (794) | (797)
Cash flow hedge/currency translation reserve- Discontinued hedges | 86 | 83 | (77)
Cash flow hedges | Currency risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Change in fair value of hedged item for ineffectiveness assessment | 240 | (439) | 500
Cash flow hedge/currency translation reserve - Continuing hedges | (8) | 213 | (80)
Cash flow hedge/currency translation reserve- Discontinued hedges | 0 | 19 | 0
Cash flow hedges | Interest rate and exchange rate risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Change in fair value of hedged item for ineffectiveness assessment | (8) | (40) | 100
Cash flow hedge/currency translation reserve - Continuing hedges | 28 | 11 | (144)
Cash flow hedge/currency translation reserve- Discontinued hedges | (13) | 0 | 0
Cash flow hedges | Inflation risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Change in fair value of hedged item for ineffectiveness assessment | (131) | 69 | (233)
Cash flow hedge/currency translation reserve - Continuing hedges | 0 | 82 | 196
Cash flow hedge/currency translation reserve- Discontinued hedges | 162 | (52) | (96)
Cash flow hedges | Equity risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Change in fair value of hedged item for ineffectiveness assessment | 10 | 2 | (9)
Cash flow hedge/currency translation reserve - Continuing hedges |  | 10 | 12
Cash flow hedge/currency translation reserve- Discontinued hedges | 0 | 0 | 0
Cash flow hedges | Other risks |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Change in fair value of hedged item for ineffectiveness assessment | 0 |  |
Cash flow hedge/currency translation reserve - Continuing hedges | 0 |  |
Cash flow hedge/currency translation reserve- Discontinued hedges | 0 |  |
Net foreign investments hedges |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Carrying amount of hedged items - Assets | 19,666 | 23,559 | 18,706
Carrying amount of hedged items - Liabilities | 0 | 0 | 0
Change in fair value of hedged item for ineffectiveness assessment | (136) | (420) | 1,888
Cash flow hedge/currency translation reserve - Continuing hedges | (7,867) | (8,002) | (8,684)
Cash flow hedge/currency translation reserve- Discontinued hedges | 2 | 0 | 0
Net foreign investments hedges | Currency risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Carrying amount of hedged items - Assets | 19,666 | 23,559 | 18,706
Carrying amount of hedged items - Liabilities | 0 | 0 | 0
Change in fair value of hedged item for ineffectiveness assessment | (136) | (420) | 1,888
Cash flow hedge/currency translation reserve - Continuing hedges | (7,867) | (8,002) | (8,684)
Cash flow hedge/currency translation reserve- Discontinued hedges | € 2 | € 0 | € 0

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- Definition The gain (loss) on the change in fair value of the hedged item used as a basis for recognising hedge ineffectiveness. Hedge ineffectiveness is the extent to which the changes in the fair value or the cash flows of the hedging instrument are greater or less than those on the hedged item. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 61 -Subparagraph a -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_61_a_iv&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 61 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_61_b&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 24B -Subparagraph a -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_24B_a_iv&doctype=Standard -URIDate 2025-03-27 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 24B -Subparagraph b -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_24B_b_i&doctype=Standard -URIDate 2025-03-27 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 61 -Subparagraph a -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_61_a_iv&doctype=Standard -URIDate 2025-03-27 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 61 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_61_b&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The amount of a hedged item, recognised as an asset. [Refer: Hedged items [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 24B -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_24B_a_i&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 61 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_61_a_i&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 61 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_61_a_i&doctype=Standard -URIDate 2025-03-27 + Details
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