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Other comprehensive income - Items may be reclassified: debt and equity instruments (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of analysis of other comprehensive income by item [line items]      
Net revaluation gains/(losses) € 436 € 2,411 € 2,321
Fair value 108,038 120,953 125,708
Impairment loss (reversal) 7,407 12,382 9,352
Financial assets at fair value through other comprehensive income      
Disclosure of analysis of other comprehensive income by item [line items]      
Impairment loss (reversal) 19 19 12
Debt instruments      
Disclosure of analysis of other comprehensive income by item [line items]      
Fair value 97,922 108,903 118,405
Government debt securities and debt instruments issued by central banks | Spain      
Disclosure of analysis of other comprehensive income by item [line items]      
Revaluation gains 271 693 947
Revaluation losses 0 0 (2)
Net revaluation gains/(losses) 271 693 945
Fair value 12,917 19,314 32,413
Government debt securities and debt instruments issued by central banks | Rest of Europe      
Disclosure of analysis of other comprehensive income by item [line items]      
Revaluation gains 544 915 664
Revaluation losses (118) (69) (38)
Net revaluation gains/(losses) 426 846 626
Fair value 20,397 23,116 19,052
Government debt securities and debt instruments issued by central banks | Latin America and rest of the world      
Disclosure of analysis of other comprehensive income by item [line items]      
Revaluation gains 334 785 839
Revaluation losses (438) (73) (121)
Net revaluation gains/(losses) (104) 712 718
Fair value 49,847 51,026 51,284
Private-sector debt securities      
Disclosure of analysis of other comprehensive income by item [line items]      
Revaluation gains 80 181 81
Revaluation losses (237) (21) (49)
Net revaluation gains/(losses) (157) 160 32
Fair value 22,424 24,714 20,096
Debt Securities and Loans and Advances      
Disclosure of analysis of other comprehensive income by item [line items]      
Revaluation gains 1,229 2,574 2,531
Revaluation losses (793) (163) (210)
Net revaluation gains/(losses) 436 2,411 2,321
Fair value € 105,585 € 118,170 € 122,845