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v3.26.1

Other disclosures - Schedule of certain financial assets and liabilities by maturity (Details) - EUR (€) € in Millions | Dec. 31, 2025 | Aug. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | --- | --- | ---
Assets |  |  |  |
Cash, cash balances at central banks and other deposits on demand | € 152,281 | € 96,923 | € 192,208 | € 220,342
Financial assets at fair value through other comprehensive income | 72,331 |  | 87,705 | 81,547
Financial assets at amortised cost | 1,202,689 |  | 1,203,707 | 1,191,403
Total certain assets | 1,427,301 |  | 1,483,620 | 1,493,292
Liabilities |  |  |  |
Financial liabilities at amortized cost | 1,421,184 |  | 1,484,322 | 1,468,703
Difference (assets less liabilities) | 6,117 |  | (702) | 24,589
On demand |  |  |  |
Assets |  |  |  |
Cash, cash balances at central banks and other deposits on demand | 152,281 |  | 192,208 | 220,342
Financial assets at fair value through other comprehensive income | 0 |  | 0 | 0
Financial assets at amortised cost | 40,174 |  | 41,652 | 40,687
Total certain assets | 192,455 |  | 233,860 | 261,029
Liabilities |  |  |  |
Financial liabilities at amortized cost | 700,717 |  | 720,659 | 711,093
Difference (assets less liabilities) | (508,262) |  | (486,799) | (450,064)
Within 3 months |  |  |  |
Assets |  |  |  |
Cash, cash balances at central banks and other deposits on demand |  |  | 0 | 0
Financial assets at fair value through other comprehensive income | 12,721 |  | 13,401 | 13,544
Financial assets at amortised cost | 213,109 |  | 208,565 | 202,066
Total certain assets | 225,830 |  | 221,966 | 215,610
Liabilities |  |  |  |
Financial liabilities at amortized cost | 271,366 |  | 256,651 | 246,898
Difference (assets less liabilities) | (45,536) |  | (34,685) | (31,288)
3 to 12 months |  |  |  |
Assets |  |  |  |
Cash, cash balances at central banks and other deposits on demand |  |  | 0 | 0
Financial assets at fair value through other comprehensive income | 8,593 |  | 9,153 | 9,234
Financial assets at amortised cost | 173,400 |  | 167,974 | 171,494
Total certain assets | 181,993 |  | 177,127 | 180,728
Liabilities |  |  |  |
Financial liabilities at amortized cost | 147,951 |  | 171,362 | 182,516
Difference (assets less liabilities) | 34,042 |  | 5,765 | (1,788)
1 to 3 years |  |  |  |
Assets |  |  |  |
Cash, cash balances at central banks and other deposits on demand |  |  | 0 | 0
Financial assets at fair value through other comprehensive income | 14,012 |  | 23,902 | 19,372
Financial assets at amortised cost | 208,743 |  | 220,871 | 232,190
Total certain assets | 222,755 |  | 244,773 | 251,562
Liabilities |  |  |  |
Financial liabilities at amortized cost | 132,783 |  | 155,620 | 161,784
Difference (assets less liabilities) | 89,972 |  | 89,153 | 89,778
3 to 5 years |  |  |  |
Assets |  |  |  |
Cash, cash balances at central banks and other deposits on demand |  |  | 0 | 0
Financial assets at fair value through other comprehensive income | 8,315 |  | 8,905 | 14,162
Financial assets at amortised cost | 163,374 |  | 176,710 | 158,556
Total certain assets | 171,689 |  | 185,615 | 172,718
Liabilities |  |  |  |
Financial liabilities at amortized cost | 72,048 |  | 89,229 | 88,527
Difference (assets less liabilities) | 99,641 |  | 96,386 | 84,191
More than 5 years |  |  |  |
Assets |  |  |  |
Cash, cash balances at central banks and other deposits on demand |  |  | 0 | 0
Financial assets at fair value through other comprehensive income | 28,690 |  | 32,344 | 25,235
Financial assets at amortised cost | 403,889 |  | 387,935 | 386,410
Total certain assets | 432,579 |  | 420,279 | 411,645
Liabilities |  |  |  |
Financial liabilities at amortized cost | 96,319 |  | 90,801 | 77,885
Difference (assets less liabilities) | 336,260 |  | 329,478 | 333,760
Deposits |  |  |  |
Liabilities |  |  |  |
Financial liabilities at amortized cost | 1,072,384 |  | 1,126,439 | 1,125,308
Deposits | On demand |  |  |  |
Liabilities |  |  |  |
Financial liabilities at amortized cost | 688,927 |  | 707,418 | 697,339
Deposits | Within 3 months |  |  |  |
Liabilities |  |  |  |
Financial liabilities at amortized cost | 223,636 |  | 213,220 | 210,538
Deposits | 3 to 12 months |  |  |  |
Liabilities |  |  |  |
Financial liabilities at amortized cost | 96,132 |  | 121,914 | 118,035
Deposits | 1 to 3 years |  |  |  |
Liabilities |  |  |  |
Financial liabilities at amortized cost | 37,030 |  | 46,431 | 61,332
Deposits | 3 to 5 years |  |  |  |
Liabilities |  |  |  |
Financial liabilities at amortized cost | 9,216 |  | 21,510 | 22,161
Deposits | More than 5 years |  |  |  |
Liabilities |  |  |  |
Financial liabilities at amortized cost | 17,443 |  | 15,946 | 15,903
Central banks |  |  |  |
Liabilities |  |  |  |
Financial liabilities at amortized cost | 18,542 |  | 24,882 | 48,782
Central banks | On demand |  |  |  |
Liabilities |  |  |  |
Financial liabilities at amortized cost | 857 |  | 17 | 168
Central banks | Within 3 months |  |  |  |
Liabilities |  |  |  |
Financial liabilities at amortized cost | 8,550 |  | 9,063 | 20,224
Central banks | 3 to 12 months |  |  |  |
Liabilities |  |  |  |
Financial liabilities at amortized cost | 4,615 |  | 11,022 | 6,941
Central banks | 1 to 3 years |  |  |  |
Liabilities |  |  |  |
Financial liabilities at amortized cost | 2,892 |  | 4,772 | 16,846
Central banks | 3 to 5 years |  |  |  |
Liabilities |  |  |  |
Financial liabilities at amortized cost | 0 |  | 0 | 4,581
Central banks | More than 5 years |  |  |  |
Liabilities |  |  |  |
Financial liabilities at amortized cost | 1,628 |  | 8 | 22
Credit institutions |  |  |  |
Liabilities |  |  |  |
Financial liabilities at amortized cost | 74,692 |  | 90,012 | 81,246
Credit institutions | On demand |  |  |  |
Liabilities |  |  |  |
Financial liabilities at amortized cost | 6,342 |  | 13,948 | 6,572
Credit institutions | Within 3 months |  |  |  |
Liabilities |  |  |  |
Financial liabilities at amortized cost | 34,993 |  | 27,149 | 25,990
Credit institutions | 3 to 12 months |  |  |  |
Liabilities |  |  |  |
Financial liabilities at amortized cost | 11,677 |  | 19,300 | 21,390
Credit institutions | 1 to 3 years |  |  |  |
Liabilities |  |  |  |
Financial liabilities at amortized cost | 12,197 |  | 15,655 | 13,434
Credit institutions | 3 to 5 years |  |  |  |
Liabilities |  |  |  |
Financial liabilities at amortized cost | 1,845 |  | 6,477 | 5,963
Credit institutions | More than 5 years |  |  |  |
Liabilities |  |  |  |
Financial liabilities at amortized cost | 7,638 |  | 7,483 | 7,897
Customer deposits |  |  |  |
Liabilities |  |  |  |
Financial liabilities at amortized cost | 979,150 |  | 1,011,545 | 995,280
Customer deposits | On demand |  |  |  |
Liabilities |  |  |  |
Financial liabilities at amortized cost | 681,728 |  | 693,453 | 690,599
Customer deposits | Within 3 months |  |  |  |
Liabilities |  |  |  |
Financial liabilities at amortized cost | 180,093 |  | 177,008 | 164,324
Customer deposits | 3 to 12 months |  |  |  |
Liabilities |  |  |  |
Financial liabilities at amortized cost | 79,840 |  | 91,592 | 89,704
Customer deposits | 1 to 3 years |  |  |  |
Liabilities |  |  |  |
Financial liabilities at amortized cost | 21,941 |  | 26,004 | 31,052
Customer deposits | 3 to 5 years |  |  |  |
Liabilities |  |  |  |
Financial liabilities at amortized cost | 7,371 |  | 15,033 | 11,617
Customer deposits | More than 5 years |  |  |  |
Liabilities |  |  |  |
Financial liabilities at amortized cost | 8,177 |  | 8,455 | 7,984
Marketable debt securities |  |  |  |
Liabilities |  |  |  |
Financial liabilities at amortized cost | 312,704 |  | 317,967 | 303,208
Marketable debt securities | On demand |  |  |  |
Liabilities |  |  |  |
Financial liabilities at amortized cost | 0 |  | 0 | 0
Marketable debt securities | Within 3 months |  |  |  |
Liabilities |  |  |  |
Financial liabilities at amortized cost | 38,875 |  | 35,570 | 28,371
Marketable debt securities | 3 to 12 months |  |  |  |
Liabilities |  |  |  |
Financial liabilities at amortized cost | 48,971 |  | 47,977 | 63,440
Marketable debt securities | 1 to 3 years |  |  |  |
Liabilities |  |  |  |
Financial liabilities at amortized cost | 94,735 |  | 100,451 | 92,554
Marketable debt securities | 3 to 5 years |  |  |  |
Liabilities |  |  |  |
Financial liabilities at amortized cost | 62,275 |  | 60,128 | 57,639
Marketable debt securities | More than 5 years |  |  |  |
Liabilities |  |  |  |
Financial liabilities at amortized cost | 67,848 |  | 73,841 | 61,204
Other financial liabilities |  |  |  |
Liabilities |  |  |  |
Financial liabilities at amortized cost | 36,096 |  | 39,916 | 40,187
Other financial liabilities | On demand |  |  |  |
Liabilities |  |  |  |
Financial liabilities at amortized cost | 11,790 |  | 13,241 | 13,754
Other financial liabilities | Within 3 months |  |  |  |
Liabilities |  |  |  |
Financial liabilities at amortized cost | 8,855 |  | 7,861 | 7,989
Other financial liabilities | 3 to 12 months |  |  |  |
Liabilities |  |  |  |
Financial liabilities at amortized cost | 2,848 |  | 1,471 | 1,041
Other financial liabilities | 1 to 3 years |  |  |  |
Liabilities |  |  |  |
Financial liabilities at amortized cost | 1,018 |  | 8,738 | 7,898
Other financial liabilities | 3 to 5 years |  |  |  |
Liabilities |  |  |  |
Financial liabilities at amortized cost | 557 |  | 7,591 | 8,727
Other financial liabilities | More than 5 years |  |  |  |
Liabilities |  |  |  |
Financial liabilities at amortized cost | 11,028 |  | 1,014 | 778
Debt securities |  |  |  |
Assets |  |  |  |
Financial assets at fair value through other comprehensive income | 58,305 |  | 76,558 | 73,565
Financial assets at amortised cost | 140,014 |  | 120,949 | 103,559
Debt securities | On demand |  |  |  |
Assets |  |  |  |
Financial assets at fair value through other comprehensive income | 0 |  | 0 | 0
Financial assets at amortised cost | 0 |  | 0 | 0
Debt securities | Within 3 months |  |  |  |
Assets |  |  |  |
Financial assets at fair value through other comprehensive income | 10,677 |  | 11,072 | 13,078
Financial assets at amortised cost | 8,547 |  | 9,628 | 12,281
Debt securities | 3 to 12 months |  |  |  |
Assets |  |  |  |
Financial assets at fair value through other comprehensive income | 7,631 |  | 8,449 | 8,433
Financial assets at amortised cost | 9,312 |  | 14,041 | 14,114
Debt securities | 1 to 3 years |  |  |  |
Assets |  |  |  |
Financial assets at fair value through other comprehensive income | 12,139 |  | 22,137 | 18,432
Financial assets at amortised cost | 25,469 |  | 17,071 | 18,608
Debt securities | 3 to 5 years |  |  |  |
Assets |  |  |  |
Financial assets at fair value through other comprehensive income | 6,619 |  | 7,623 | 12,764
Financial assets at amortised cost | 17,474 |  | 22,705 | 11,281
Debt securities | More than 5 years |  |  |  |
Assets |  |  |  |
Financial assets at fair value through other comprehensive income | 21,239 |  | 27,277 | 20,858
Financial assets at amortised cost | 79,212 |  | 57,504 | 47,275
Loans and advances |  |  |  |
Assets |  |  |  |
Financial assets at fair value through other comprehensive income | 14,026 |  | 11,147 | 7,982
Financial assets at amortised cost | 1,062,675 |  | 1,082,758 | 1,087,844
Loans and advances | On demand |  |  |  |
Assets |  |  |  |
Financial assets at fair value through other comprehensive income | 0 |  | 0 | 0
Financial assets at amortised cost | 40,174 |  | 41,652 | 40,687
Loans and advances | Within 3 months |  |  |  |
Assets |  |  |  |
Financial assets at fair value through other comprehensive income | 2,044 |  | 2,329 | 466
Financial assets at amortised cost | 204,562 |  | 198,937 | 189,785
Loans and advances | 3 to 12 months |  |  |  |
Assets |  |  |  |
Financial assets at fair value through other comprehensive income | 962 |  | 704 | 801
Financial assets at amortised cost | 164,088 |  | 153,933 | 157,380
Loans and advances | 1 to 3 years |  |  |  |
Assets |  |  |  |
Financial assets at fair value through other comprehensive income | 1,873 |  | 1,765 | 940
Financial assets at amortised cost | 183,274 |  | 203,800 | 213,582
Loans and advances | 3 to 5 years |  |  |  |
Assets |  |  |  |
Financial assets at fair value through other comprehensive income | 1,696 |  | 1,282 | 1,398
Financial assets at amortised cost | 145,900 |  | 154,005 | 147,275
Loans and advances | More than 5 years |  |  |  |
Assets |  |  |  |
Financial assets at fair value through other comprehensive income | 7,451 |  | 5,067 | 4,377
Financial assets at amortised cost | 324,677 |  | 330,431 | 339,135
Central banks |  |  |  |
Assets |  |  |  |
Financial assets at amortised cost | 15,986 |  | 16,179 | 20,082
Central banks | On demand |  |  |  |
Assets |  |  |  |
Financial assets at amortised cost | 0 |  | 0 | 0
Central banks | Within 3 months |  |  |  |
Assets |  |  |  |
Financial assets at amortised cost | 14,782 |  | 15,067 | 18,730
Central banks | 3 to 12 months |  |  |  |
Assets |  |  |  |
Financial assets at amortised cost | 0 |  | 0 | 0
Central banks | 1 to 3 years |  |  |  |
Assets |  |  |  |
Financial assets at amortised cost | 0 |  | 0 | 0
Central banks | 3 to 5 years |  |  |  |
Assets |  |  |  |
Financial assets at amortised cost | 1,134 |  | 0 | 0
Central banks | More than 5 years |  |  |  |
Assets |  |  |  |
Financial assets at amortised cost | 70 |  | 1,112 | 1,352
Credit institutions |  |  |  |
Assets |  |  |  |
Financial assets at fair value through other comprehensive income | 1,120 |  | 363 |
Financial assets at amortised cost | 61,513 |  | 55,537 | 57,917
Credit institutions | On demand |  |  |  |
Assets |  |  |  |
Financial assets at fair value through other comprehensive income | 0 |  | 0 |
Financial assets at amortised cost | 4,577 |  | 6,208 | 6,783
Credit institutions | Within 3 months |  |  |  |
Assets |  |  |  |
Financial assets at fair value through other comprehensive income | 0 |  | 36 |
Financial assets at amortised cost | 26,620 |  | 23,550 | 26,671
Credit institutions | 3 to 12 months |  |  |  |
Assets |  |  |  |
Financial assets at fair value through other comprehensive income | 111 |  | 0 |
Financial assets at amortised cost | 10,564 |  | 4,166 | 6,313
Credit institutions | 1 to 3 years |  |  |  |
Assets |  |  |  |
Financial assets at fair value through other comprehensive income | 3 |  | 98 |
Financial assets at amortised cost | 5,594 |  | 5,760 | 7,151
Credit institutions | 3 to 5 years |  |  |  |
Assets |  |  |  |
Financial assets at fair value through other comprehensive income | 5 |  | 6 |
Financial assets at amortised cost | 1,198 |  | 1,843 | 1,521
Credit institutions | More than 5 years |  |  |  |
Assets |  |  |  |
Financial assets at fair value through other comprehensive income | 1,001 |  | 223 |
Financial assets at amortised cost | 12,960 |  | 14,010 | 9,478
Customers |  |  |  |
Assets |  |  |  |
Financial assets at fair value through other comprehensive income | 12,906 |  | 10,784 | 7,669
Financial assets at amortised cost | 985,176 |  | 1,011,042 | 1,009,845
Customers | On demand |  |  |  |
Assets |  |  |  |
Financial assets at fair value through other comprehensive income | 0 |  | 0 | 0
Financial assets at amortised cost | 35,597 |  | 35,444 | 33,904
Customers | Within 3 months |  |  |  |
Assets |  |  |  |
Financial assets at fair value through other comprehensive income | 2,044 |  | 2,293 | 466
Financial assets at amortised cost | 163,160 |  | 160,320 | 144,384
Customers | 3 to 12 months |  |  |  |
Assets |  |  |  |
Financial assets at fair value through other comprehensive income | 851 |  | 704 | 801
Financial assets at amortised cost | 153,524 |  | 149,767 | 151,067
Customers | 1 to 3 years |  |  |  |
Assets |  |  |  |
Financial assets at fair value through other comprehensive income | 1,870 |  | 1,667 | 940
Financial assets at amortised cost | 177,680 |  | 198,040 | 206,431
Customers | 3 to 5 years |  |  |  |
Assets |  |  |  |
Financial assets at fair value through other comprehensive income | 1,691 |  | 1,276 | 1,085
Financial assets at amortised cost | 143,568 |  | 152,162 | 145,754
Customers | More than 5 years |  |  |  |
Assets |  |  |  |
Financial assets at fair value through other comprehensive income | 6,450 |  | 4,844 | 4,377
Financial assets at amortised cost | € 311,647 |  | € 315,309 | € 328,305

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- Definition Represents the amount of certain financial assets less financial liabilities at amortised cost. + References No definition available. + Details
Name: | san_CertainFinancialAssetsLiabilities
Namespace Prefix: | san_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_OnDemandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_NotLaterThanThreeMonthsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanThreeMonthsAndNotLaterThanOneYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanOneYearAndNotLaterThanThreeYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanThreeYearsAndNotLaterThanFiveYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanFiveYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialLiabilitiesAxis=san_DepositMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialLiabilitiesAxis=san_DepositsCentralBanksMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialLiabilitiesAxis=san_DepositsCreditInstitutionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialLiabilitiesAxis=san_DepositsCustomersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialLiabilitiesAxis=san_DebtInstrumentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialLiabilitiesAxis=san_OtherFinancialLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=ifrs-full_DebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=san_LoansAndAdvancesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=san_LoansAndAdvancesCentralBanksMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |