v3.26.1
Other comprehensive income - 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
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of analysis of other comprehensive income by item [line items]      
Net revaluation gains/ (losses) € (372) € (736) € (555)
Fair Value 74,612 89,898 83,308
Debt securities      
Disclosure of analysis of other comprehensive income by item [line items]      
Revaluation gains 533 584 667
Revaluation losses (905) (1,320) (1,222)
Net revaluation gains/ (losses) (372) (736) (555)
Fair Value 72,331 87,705 81,547
Issued by Public-sector | Spain      
Disclosure of analysis of other comprehensive income by item [line items]      
Revaluation gains 118 103 17
Revaluation losses 0 0 0
Net revaluation gains/ (losses) 118 103 17
Fair Value 10,142 13,764 9,867
Issued by Public-sector | Rest of Europe      
Disclosure of analysis of other comprehensive income by item [line items]      
Revaluation gains 209 268 333
Revaluation losses (36) (70) (96)
Net revaluation gains/ (losses) 173 198 237
Fair Value 8,856 15,413 18,258
Issued by Public-sector | America and rest of the world      
Disclosure of analysis of other comprehensive income by item [line items]      
Revaluation gains 109 76 194
Revaluation losses (528) (944) (820)
Net revaluation gains/ (losses) (419) (868) (626)
Fair Value 31,685 38,784 38,169
Issued by Private-sector | Spain      
Disclosure of analysis of other comprehensive income by item [line items]      
Revaluation gains 29 96 98
Revaluation losses (53) (23) (9)
Net revaluation gains/ (losses) (24) 73 89
Fair Value 9,745 6,019 5,129
Issued by Private-sector | Rest of Europe      
Disclosure of analysis of other comprehensive income by item [line items]      
Revaluation gains 28 25 19
Revaluation losses (15) (18) (30)
Net revaluation gains/ (losses) 13 7 (11)
Fair Value 6,445 7,478 5,018
Issued by Private-sector | America and rest of the world      
Disclosure of analysis of other comprehensive income by item [line items]      
Revaluation gains 40 16 6
Revaluation losses (273) (265) (267)
Net revaluation gains/ (losses) (233) (249) (261)
Fair Value € 5,458 € 6,247 € 5,106