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Hedging derivatives - Schedule of movement in hedging components in other comprehensive income (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] |  |  |
Balance at beginning of year | € (8,300) | € (9,424) | € (9,187)
Balance at end of year | (7,445) | (8,300) | (9,424)
Cash flow hedges |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings (losses) recognized in other comprehensive income | 1,049 | 558 | 2,592
Cash flow hedges | Interest rate risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings (losses) recognized in other comprehensive income | 1,155 | 163 | 2,179
Cash flow hedges | Currency risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings (losses) recognized in other comprehensive income | (229) | 312 | 7
Cash flow hedges | Interest rate and exchange rate risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings (losses) recognized in other comprehensive income | 8 | 155 | 164
Cash flow hedges | Inflation risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings (losses) recognized in other comprehensive income | 131 | (70) | 233
Gain or loss in value - recognized in equity | 211 | (139) | 105
Amounts transferred to income statements | (80) | 69 | 128
Cash flow hedges | Equity risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings (losses) recognized in other comprehensive income | (16) | (2) | 9
Hedges of net investments in foreign operations |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings (losses) recognized in other comprehensive income | 136 | 420 | (1,888)
Minorities, taxes and others | (330) | 146 | (941)
Hedges of net investments in foreign operations | Currency risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings (losses) recognized in other comprehensive income | 136 | 420 | (1,888)
Fair value hedges |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings (losses) recognized in other comprehensive income | 0 | 0 | 0
Fair value hedges | Interest rate risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings (losses) recognized in other comprehensive income | 0 | 0 | 0
Fair value hedges | Currency risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings (losses) recognized in other comprehensive income | 0 | 0 | 0
Fair value hedges | Interest rate and exchange rate risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings (losses) recognized in other comprehensive income | 0 | 0 | 0
A) Not designated elements - linked to a time period | Cash flow hedges | Interest rate risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings (losses) recognized in other comprehensive income | (19) | 0 | 0
Gain or loss in value - recognized in equity | (19) | 0 | 0
Amounts transferred to income statements | 0 | 0 | 0
Other reclassifications | 0 | 0 | 0
A) Not designated elements - linked to a time period | Cash flow hedges | Currency risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings (losses) recognized in other comprehensive income | 11 | 0 | 0
Gain or loss in value - recognized in equity | 26 | 0 | 0
Amounts transferred to income statements | (15) | 0 | 0
Other reclassifications | 0 | 0 | 0
A) Not designated elements - linked to a time period | Cash flow hedges | Interest rate and exchange rate risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings (losses) recognized in other comprehensive income | 0 | 0 | 0
A) Not designated elements - linked to a time period | Cash flow hedges | Equity risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings (losses) recognized in other comprehensive income | (6) | 0 | 0
Gain or loss in value - recognized in equity | (8) | 0 | 0
Amounts transferred to income statements | 2 | 0 | 0
Other reclassifications | 0 | 0 | 0
A) Not designated elements - linked to a time period | Hedges of net investments in foreign operations | Currency risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings (losses) recognized in other comprehensive income | 0 | 0 | 0
A) Not designated elements - linked to a time period | Fair value hedges | Interest rate risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings (losses) recognized in other comprehensive income | 0 | 0 | 0
A) Not designated elements - linked to a time period | Fair value hedges | Currency risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings (losses) recognized in other comprehensive income | 0 | 0 | 0
A) Not designated elements - linked to a time period | Fair value hedges | Interest rate and exchange rate risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings (losses) recognized in other comprehensive income | 0 | 0 | 0
B) Not designated elements - linked to a transaction | Cash flow hedges | Interest rate risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings (losses) recognized in other comprehensive income | 0 | 0 | 0
B) Not designated elements - linked to a transaction | Cash flow hedges | Currency risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings (losses) recognized in other comprehensive income | 0 | 0 | 0
B) Not designated elements - linked to a transaction | Cash flow hedges | Interest rate and exchange rate risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings (losses) recognized in other comprehensive income | 0 | 0 | 0
B) Not designated elements - linked to a transaction | Cash flow hedges | Equity risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings (losses) recognized in other comprehensive income | 0 | 0 | 0
B) Not designated elements - linked to a transaction | Hedges of net investments in foreign operations | Currency risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings (losses) recognized in other comprehensive income | 0 | 0 | 0
B) Not designated elements - linked to a transaction | Fair value hedges | Interest rate risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings (losses) recognized in other comprehensive income | 0 | 0 | 0
B) Not designated elements - linked to a transaction | Fair value hedges | Currency risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings (losses) recognized in other comprehensive income | 0 | 0 | 0
B) Not designated elements - linked to a transaction | Fair value hedges | Interest rate and exchange rate risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings (losses) recognized in other comprehensive income | 0 | 0 | 0
C) Designated elements |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings (losses) recognized in other comprehensive income | 1,199 | 978 | 704
Amounts transferred to income statements | 706 | 1,256 | 2,622
C) Designated elements | Cash flow hedges |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings (losses) recognized in other comprehensive income | 1,063 | 558 | 2,592
Amounts transferred to income statements | 706 | 1,256 | 2,622
C) Designated elements | Cash flow hedges | Interest rate risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings (losses) recognized in other comprehensive income | 1,174 | 163 | 2,179
Gain or loss in value - recognized in equity | 536 | (1,003) | 532
Amounts transferred to income statements | 638 | 1,166 | 1,647
C) Designated elements | Cash flow hedges | Currency risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings (losses) recognized in other comprehensive income | (240) | 312 | 7
Gain or loss in value - recognized in equity | (155) | 631 | (409)
Amounts transferred to income statements | (85) | (319) | 416
C) Designated elements | Cash flow hedges | Interest rate and exchange rate risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings (losses) recognized in other comprehensive income | 8 | 155 | 164
Gain or loss in value - recognized in equity | (225) | (185) | 267
Amounts transferred to income statements | 233 | 340 | 431
C) Designated elements | Cash flow hedges | Inflation risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings (losses) recognized in other comprehensive income | 131 | (70) | 233
Amounts transferred to income statements | (80) | 69 | 128
C) Designated elements | Cash flow hedges | Equity risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings (losses) recognized in other comprehensive income | (10) | (2) | 9
Gain or loss in value - recognized in equity | (10) | (2) | 9
Amounts transferred to income statements | 0 | 0 | 0
C) Designated elements | Hedges of net investments in foreign operations |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings (losses) recognized in other comprehensive income | 136 | 420 | (1,888)
Amounts transferred to income statements | 0 | 0 | 0
C) Designated elements | Hedges of net investments in foreign operations | Currency risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Earnings (losses) recognized in other comprehensive income | 136 | 420 | (1,888)
Gain or loss in value - recognized in equity | 136 | 420 | (1,888)
Amounts transferred to income statements | € 0 | € 0 | € 0

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