v3.26.1
Equity - Schedule of other comprehensive income, that may be reclassified to profit or loss, by type of instrument and geographical origin of the issuer (Details) - EUR (€)
€ in Millions
Jun. 30, 2026
Dec. 31, 2025
Financial assets at fair value through other comprehensive income [abstract]    
Net revaluation gains/(losses) € (577) € (372)
Fair value 75,371 74,612
Loans and advances    
Financial assets at fair value through other comprehensive income [abstract]    
Revaluation gains 146 169
Revaluation losses (121) (71)
Net revaluation gains/(losses) 25 98
Debt instruments    
Financial assets at fair value through other comprehensive income [abstract]    
Revaluation gains 289 364
Revaluation losses (891) (834)
Net revaluation gains/(losses) (602) (470)
Fair value 58,970 58,305
Issued by public Public-sector | Spain    
Financial assets at fair value through other comprehensive income [abstract]    
Revaluation gains 90 118
Revaluation losses 0 0
Net revaluation gains/(losses) 90 118
Fair value 11,447 10,142
Issued by public Public-sector | Rest of Europe    
Financial assets at fair value through other comprehensive income [abstract]    
Revaluation gains 47 61
Revaluation losses (42) (36)
Net revaluation gains/(losses) 5 25
Fair value 5,484 6,469
Issued by public Public-sector | America and rest of the world    
Financial assets at fair value through other comprehensive income [abstract]    
Revaluation gains 105 109
Revaluation losses (645) (528)
Net revaluation gains/(losses) (540) (419)
Fair value 33,044 31,685
Issued by Private-sector | Spain    
Financial assets at fair value through other comprehensive income [abstract]    
Revaluation gains 8 8
Revaluation losses (5) (6)
Net revaluation gains/(losses) 3 2
Fair value 279 376
Issued by Private-sector | Rest of Europe    
Financial assets at fair value through other comprehensive income [abstract]    
Revaluation gains 27 28
Revaluation losses (5) (15)
Net revaluation gains/(losses) 22 13
Fair value 4,045 4,672
Issued by Private-sector | America and rest of the world    
Financial assets at fair value through other comprehensive income [abstract]    
Revaluation gains 12 40
Revaluation losses (194) (249)
Net revaluation gains/(losses) (182) (209)
Fair value € 4,671 € 4,961