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Risk management - Schedule of exposure to risk, Spain foreclosed properties (Details) - Spain - Foreclosed properties - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Assets foreclosed |  |  |
Loans and advances to customers | € 1,898 | € 2,131 | € 2,448
Changes in property loans |  |  |
Gross additions | 100 | 100 | 300
Disposals | (700) | (800) | (1,200)
Difference | (600) | (700) | (900)
Construction and property development |  |  |
Assets foreclosed |  |  |
Loans and advances to customers | 1,699 |  |
Completed buildings |  |  |
Assets foreclosed |  |  |
Loans and advances to customers | 157 |  |
Completed buildings | Residential |  |  |
Assets foreclosed |  |  |
Loans and advances to customers | 58 |  |
Completed buildings | Other |  |  |
Assets foreclosed |  |  |
Loans and advances to customers | 99 |  |
Buildings under construction |  |  |
Assets foreclosed |  |  |
Loans and advances to customers | 58 |  |
Buildings under construction | Residential |  |  |
Assets foreclosed |  |  |
Loans and advances to customers | 0 |  |
Buildings under construction | Other |  |  |
Assets foreclosed |  |  |
Loans and advances to customers | 58 |  |
Land |  |  |
Assets foreclosed |  |  |
Loans and advances to customers | 1,484 |  |
Land | Developed land |  |  |
Assets foreclosed |  |  |
Loans and advances to customers | 347 |  |
Land | Other land |  |  |
Assets foreclosed |  |  |
Loans and advances to customers | 1,137 |  |
Property assets from home purchase mortgage loans to households |  |  |
Assets foreclosed |  |  |
Loans and advances to customers | 162 |  |
Other foreclosed property assets |  |  |
Assets foreclosed |  |  |
Loans and advances to customers | 37 |  |
Gross carrying amount |  |  |
Assets foreclosed |  |  |
Loans and advances to customers | 4,258 | 4,823 | 5,506
Gross carrying amount | Construction and property development |  |  |
Assets foreclosed |  |  |
Loans and advances to customers | 3,843 |  |
Gross carrying amount | Completed buildings |  |  |
Assets foreclosed |  |  |
Loans and advances to customers | 481 |  |
Gross carrying amount | Completed buildings | Residential |  |  |
Assets foreclosed |  |  |
Loans and advances to customers | 129 |  |
Gross carrying amount | Completed buildings | Other |  |  |
Assets foreclosed |  |  |
Loans and advances to customers | 352 |  |
Gross carrying amount | Buildings under construction |  |  |
Assets foreclosed |  |  |
Loans and advances to customers | 107 |  |
Gross carrying amount | Buildings under construction | Residential |  |  |
Assets foreclosed |  |  |
Loans and advances to customers | 0 |  |
Gross carrying amount | Buildings under construction | Other |  |  |
Assets foreclosed |  |  |
Loans and advances to customers | 107 |  |
Gross carrying amount | Land |  |  |
Assets foreclosed |  |  |
Loans and advances to customers | 3,255 |  |
Gross carrying amount | Land | Developed land |  |  |
Assets foreclosed |  |  |
Loans and advances to customers | 776 |  |
Gross carrying amount | Land | Other land |  |  |
Assets foreclosed |  |  |
Loans and advances to customers | 2,479 |  |
Gross carrying amount | Property assets from home purchase mortgage loans to households |  |  |
Assets foreclosed |  |  |
Loans and advances to customers | 334 |  |
Gross carrying amount | Other foreclosed property assets |  |  |
Assets foreclosed |  |  |
Loans and advances to customers | 81 |  |
Accumulated impairment |  |  |
Assets foreclosed |  |  |
Loans and advances to customers | 2,360 | € 2,692 | € 3,058
Accumulated impairment | Construction and property development |  |  |
Assets foreclosed |  |  |
Loans and advances to customers | 2,144 |  |
Accumulated impairment | Completed buildings |  |  |
Assets foreclosed |  |  |
Loans and advances to customers | 324 |  |
Accumulated impairment | Completed buildings | Residential |  |  |
Assets foreclosed |  |  |
Loans and advances to customers | 71 |  |
Accumulated impairment | Completed buildings | Other |  |  |
Assets foreclosed |  |  |
Loans and advances to customers | 253 |  |
Accumulated impairment | Buildings under construction |  |  |
Assets foreclosed |  |  |
Loans and advances to customers | 49 |  |
Accumulated impairment | Buildings under construction | Residential |  |  |
Assets foreclosed |  |  |
Loans and advances to customers | 0 |  |
Accumulated impairment | Buildings under construction | Other |  |  |
Assets foreclosed |  |  |
Loans and advances to customers | 49 |  |
Accumulated impairment | Land |  |  |
Assets foreclosed |  |  |
Loans and advances to customers | 1,771 |  |
Accumulated impairment | Land | Developed land |  |  |
Assets foreclosed |  |  |
Loans and advances to customers | 429 |  |
Accumulated impairment | Land | Other land |  |  |
Assets foreclosed |  |  |
Loans and advances to customers | 1,342 |  |
Accumulated impairment | Property assets from home purchase mortgage loans to households |  |  |
Assets foreclosed |  |  |
Loans and advances to customers | 172 |  |
Accumulated impairment | Other foreclosed property assets |  |  |
Assets foreclosed |  |  |
Loans and advances to customers | 44 |  |
Impairment losses since time of foreclosure |  |  |
Assets foreclosed |  |  |
Loans and advances to customers | 1,746 |  |
Impairment losses since time of foreclosure | Construction and property development |  |  |
Assets foreclosed |  |  |
Loans and advances to customers | 1,591 |  |
Impairment losses since time of foreclosure | Completed buildings |  |  |
Assets foreclosed |  |  |
Loans and advances to customers | 282 |  |
Impairment losses since time of foreclosure | Completed buildings | Residential |  |  |
Assets foreclosed |  |  |
Loans and advances to customers | 60 |  |
Impairment losses since time of foreclosure | Completed buildings | Other |  |  |
Assets foreclosed |  |  |
Loans and advances to customers | 222 |  |
Impairment losses since time of foreclosure | Buildings under construction |  |  |
Assets foreclosed |  |  |
Loans and advances to customers | 35 |  |
Impairment losses since time of foreclosure | Buildings under construction | Residential |  |  |
Assets foreclosed |  |  |
Loans and advances to customers | 0 |  |
Impairment losses since time of foreclosure | Buildings under construction | Other |  |  |
Assets foreclosed |  |  |
Loans and advances to customers | 35 |  |
Impairment losses since time of foreclosure | Land |  |  |
Assets foreclosed |  |  |
Loans and advances to customers | 1,274 |  |
Impairment losses since time of foreclosure | Land | Developed land |  |  |
Assets foreclosed |  |  |
Loans and advances to customers | 260 |  |
Impairment losses since time of foreclosure | Land | Other land |  |  |
Assets foreclosed |  |  |
Loans and advances to customers | 1,014 |  |
Impairment losses since time of foreclosure | Property assets from home purchase mortgage loans to households |  |  |
Assets foreclosed |  |  |
Loans and advances to customers | 119 |  |
Impairment losses since time of foreclosure | Other foreclosed property assets |  |  |
Assets foreclosed |  |  |
Loans and advances to customers | € 36 |  |

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