v3.26.1
Note 5 Total group assets by operating segment (Details) - EUR (€)
€ in Millions
Jun. 30, 2026
Dec. 31, 2025
 [1]
Assets of the Group by operating segments [Line Items]    
Assets € 965,426 € 859,576
SPAIN    
Assets of the Group by operating segments [Line Items]    
Assets 525,713 458,090
MEXICO    
Assets of the Group by operating segments [Line Items]    
Assets 202,938 182,654
TURKEY    
Assets of the Group by operating segments [Line Items]    
Assets 98,885 90,702
South America [Member]    
Assets of the Group by operating segments [Line Items]    
Assets 86,471 76,624
Rest of business [Member]    
Assets of the Group by operating segments [Line Items]    
Assets 118,016 88,354
Subtotal assets by operating segments [Member]    
Assets of the Group by operating segments [Line Items]    
Assets 1,032,023 896,424
Corporate Center And Adjustments [Member]    
Assets of the Group by operating segments [Line Items]    
Assets € (66,597) € (36,848)
[1]
(1) In the first quarter of 2026 certain immaterial balance sheet amounts related to specific activities undertaken by the business units were reallocated between the operating segments and the Corporate Center. As a result, certain immaterial income and expenses were reallocated, in particular, between Spain, Mexico, South America and Rest of Business and the Corporate Center. In order to make the period-on-period comparison homogeneous, the figures for year 2025 have been revised, which has not affected the consolidated financial information of the Group.