v3.26.1
Other disclosures - Disclosure of foreclosed real estate assets (Details) - Foreclosed properties - Spain - EUR (€)
€ in Millions
Jun. 30, 2026
Dec. 31, 2025
Disclosure of credit risk exposure [line items]    
Loans and advances to customers € 1,842 € 1,898
Construction and property development loans    
Disclosure of credit risk exposure [line items]    
Loans and advances to customers 1,658 1,699
Completed Buildings    
Disclosure of credit risk exposure [line items]    
Loans and advances to customers 129 157
Completed Buildings | Residential    
Disclosure of credit risk exposure [line items]    
Loans and advances to customers 47 58
Completed Buildings | Other    
Disclosure of credit risk exposure [line items]    
Loans and advances to customers 82 99
Buildings under construction    
Disclosure of credit risk exposure [line items]    
Loans and advances to customers 99 58
Buildings under construction | Residential    
Disclosure of credit risk exposure [line items]    
Loans and advances to customers 0 0
Buildings under construction | Other    
Disclosure of credit risk exposure [line items]    
Loans and advances to customers 99 58
Land    
Disclosure of credit risk exposure [line items]    
Loans and advances to customers 1,430 1,484
Land | Developed Land    
Disclosure of credit risk exposure [line items]    
Loans and advances to customers 297 347
Land | Other land    
Disclosure of credit risk exposure [line items]    
Loans and advances to customers 1,133 1,137
Property assets from home purchase mortgage loans to households    
Disclosure of credit risk exposure [line items]    
Loans and advances to customers 151 162
Other foreclosed property assets    
Disclosure of credit risk exposure [line items]    
Loans and advances to customers 33 37
Gross carrying amount    
Disclosure of credit risk exposure [line items]    
Loans and advances to customers 4,101 4,258
Gross carrying amount | Construction and property development loans    
Disclosure of credit risk exposure [line items]    
Loans and advances to customers 3,705 3,843
Gross carrying amount | Completed Buildings    
Disclosure of credit risk exposure [line items]    
Loans and advances to customers 439 481
Gross carrying amount | Completed Buildings | Residential    
Disclosure of credit risk exposure [line items]    
Loans and advances to customers 114 129
Gross carrying amount | Completed Buildings | Other    
Disclosure of credit risk exposure [line items]    
Loans and advances to customers 325 352
Gross carrying amount | Buildings under construction    
Disclosure of credit risk exposure [line items]    
Loans and advances to customers 161 107
Gross carrying amount | Buildings under construction | Residential    
Disclosure of credit risk exposure [line items]    
Loans and advances to customers 0 0
Gross carrying amount | Buildings under construction | Other    
Disclosure of credit risk exposure [line items]    
Loans and advances to customers 161 107
Gross carrying amount | Land    
Disclosure of credit risk exposure [line items]    
Loans and advances to customers 3,105 3,255
Gross carrying amount | Land | Developed Land    
Disclosure of credit risk exposure [line items]    
Loans and advances to customers 663 776
Gross carrying amount | Land | Other land    
Disclosure of credit risk exposure [line items]    
Loans and advances to customers 2,442 2,479
Gross carrying amount | Property assets from home purchase mortgage loans to households    
Disclosure of credit risk exposure [line items]    
Loans and advances to customers 322 334
Gross carrying amount | Other foreclosed property assets    
Disclosure of credit risk exposure [line items]    
Loans and advances to customers 74 81
Accumulated impairment    
Disclosure of credit risk exposure [line items]    
Loans and advances to customers 2,259 2,360
Accumulated impairment | Construction and property development loans    
Disclosure of credit risk exposure [line items]    
Loans and advances to customers 2,047 2,144
Accumulated impairment | Completed Buildings    
Disclosure of credit risk exposure [line items]    
Loans and advances to customers 310 324
Accumulated impairment | Completed Buildings | Residential    
Disclosure of credit risk exposure [line items]    
Loans and advances to customers 67 71
Accumulated impairment | Completed Buildings | Other    
Disclosure of credit risk exposure [line items]    
Loans and advances to customers 243 253
Accumulated impairment | Buildings under construction    
Disclosure of credit risk exposure [line items]    
Loans and advances to customers 62 49
Accumulated impairment | Buildings under construction | Residential    
Disclosure of credit risk exposure [line items]    
Loans and advances to customers 0 0
Accumulated impairment | Buildings under construction | Other    
Disclosure of credit risk exposure [line items]    
Loans and advances to customers 62 49
Accumulated impairment | Land    
Disclosure of credit risk exposure [line items]    
Loans and advances to customers 1,675 1,771
Accumulated impairment | Land | Developed Land    
Disclosure of credit risk exposure [line items]    
Loans and advances to customers 366 429
Accumulated impairment | Land | Other land    
Disclosure of credit risk exposure [line items]    
Loans and advances to customers 1,309 1,342
Accumulated impairment | Property assets from home purchase mortgage loans to households    
Disclosure of credit risk exposure [line items]    
Loans and advances to customers 171 172
Accumulated impairment | Other foreclosed property assets    
Disclosure of credit risk exposure [line items]    
Loans and advances to customers 41 44
Of which: Impairment losses since time of the foreclosure    
Disclosure of credit risk exposure [line items]    
Loans and advances to customers 1,672 1,746
Of which: Impairment losses since time of the foreclosure | Construction and property development loans    
Disclosure of credit risk exposure [line items]    
Loans and advances to customers 1,520 1,591
Of which: Impairment losses since time of the foreclosure | Completed Buildings    
Disclosure of credit risk exposure [line items]    
Loans and advances to customers 271 282
Of which: Impairment losses since time of the foreclosure | Completed Buildings | Residential    
Disclosure of credit risk exposure [line items]    
Loans and advances to customers 57 60
Of which: Impairment losses since time of the foreclosure | Completed Buildings | Other    
Disclosure of credit risk exposure [line items]    
Loans and advances to customers 214 222
Of which: Impairment losses since time of the foreclosure | Buildings under construction    
Disclosure of credit risk exposure [line items]    
Loans and advances to customers 48 35
Of which: Impairment losses since time of the foreclosure | Buildings under construction | Residential    
Disclosure of credit risk exposure [line items]    
Loans and advances to customers 0 0
Of which: Impairment losses since time of the foreclosure | Buildings under construction | Other    
Disclosure of credit risk exposure [line items]    
Loans and advances to customers 48 35
Of which: Impairment losses since time of the foreclosure | Land    
Disclosure of credit risk exposure [line items]    
Loans and advances to customers 1,201 1,274
Of which: Impairment losses since time of the foreclosure | Land | Developed Land    
Disclosure of credit risk exposure [line items]    
Loans and advances to customers 215 260
Of which: Impairment losses since time of the foreclosure | Land | Other land    
Disclosure of credit risk exposure [line items]    
Loans and advances to customers 986 1,014
Of which: Impairment losses since time of the foreclosure | Property assets from home purchase mortgage loans to households    
Disclosure of credit risk exposure [line items]    
Loans and advances to customers 118 119
Of which: Impairment losses since time of the foreclosure | Other foreclosed property assets    
Disclosure of credit risk exposure [line items]    
Loans and advances to customers € 34 € 36