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Note 12 Financial assets at fair value through other comprehensive income debt securities (Details) - EUR (€)
€ in Millions
Jun. 30, 2022
Dec. 31, 2021
Financial assets at fair value through other comprehensive income debt securities [Line Items]    
Amortized cost of debt securities € 61,773 € 58,176
Fair value of debt securities 61,584 59,074
Issued in euros [Member]    
Financial assets at fair value through other comprehensive income debt securities [Line Items]    
Amortized cost of debt securities 18,770 17,625
Fair value of debt securities 18,945 18,355
Issued in euros [Member] | Government agency debt securities [Member]    
Financial assets at fair value through other comprehensive income debt securities [Line Items]    
Amortized cost of debt securities 17,346 15,889
Fair value of debt securities 17,515 16,544
Issued in euros [Member] | Central banks [Member]    
Financial assets at fair value through other comprehensive income debt securities [Line Items]    
Amortized cost of debt securities 0
Fair value of debt securities 0
Issued in euros [Member] | credit institutions [Member]    
Financial assets at fair value through other comprehensive income debt securities [Line Items]    
Amortized cost of debt securities 891 1,125
Fair value of debt securities 896 1,176
Issued in euros [Member] | Other issuers [Member]    
Financial assets at fair value through other comprehensive income debt securities [Line Items]    
Amortized cost of debt securities 533 612
Fair value of debt securities 534 635
MEXICO    
Financial assets at fair value through other comprehensive income debt securities [Line Items]    
Amortized cost of debt securities 11,710 11,097
Fair value of debt securities 10,881 10,769
MEXICO | Government agency debt securities [Member]    
Financial assets at fair value through other comprehensive income debt securities [Line Items]    
Amortized cost of debt securities 11,099 10,467
Fair value of debt securities 10,297 10,141
MEXICO | Central banks [Member]    
Financial assets at fair value through other comprehensive income debt securities [Line Items]    
Amortized cost of debt securities 0 0
Fair value of debt securities 0 0
MEXICO | credit institutions [Member]    
Financial assets at fair value through other comprehensive income debt securities [Line Items]    
Amortized cost of debt securities 131 120
Fair value of debt securities 121 118
MEXICO | Other issuers [Member]    
Financial assets at fair value through other comprehensive income debt securities [Line Items]    
Amortized cost of debt securities 480 509
Fair value of debt securities 464 510
ITALY    
Financial assets at fair value through other comprehensive income debt securities [Line Items]    
Amortized cost of debt securities 5,917 7,407
Fair value of debt securities 5,914 7,608
ITALY | Government agency debt securities [Member]    
Financial assets at fair value through other comprehensive income debt securities [Line Items]    
Amortized cost of debt securities 5,757 7,274
Fair value of debt securities 5,756 7,474
ITALY | Central banks [Member]    
Financial assets at fair value through other comprehensive income debt securities [Line Items]    
Amortized cost of debt securities 0 0
Fair value of debt securities 0 0
ITALY | credit institutions [Member]    
Financial assets at fair value through other comprehensive income debt securities [Line Items]    
Amortized cost of debt securities 55 47
Fair value of debt securities 55 47
ITALY | Other issuers [Member]    
Financial assets at fair value through other comprehensive income debt securities [Line Items]    
Amortized cost of debt securities 104 86
Fair value of debt securities 103 87
JAPAN    
Financial assets at fair value through other comprehensive income debt securities [Line Items]    
Amortized cost of debt securities 4,604 4,961
Fair value of debt securities 4,606 4,968
JAPAN | Government agency debt securities [Member]    
Financial assets at fair value through other comprehensive income debt securities [Line Items]    
Amortized cost of debt securities 4,512 4,906
Fair value of debt securities 4,515 4,913
JAPAN | Central banks [Member]    
Financial assets at fair value through other comprehensive income debt securities [Line Items]    
Amortized cost of debt securities 0 0
Fair value of debt securities 0 0
JAPAN | credit institutions [Member]    
Financial assets at fair value through other comprehensive income debt securities [Line Items]    
Amortized cost of debt securities 14 18
Fair value of debt securities 14 18
JAPAN | Other issuers [Member]    
Financial assets at fair value through other comprehensive income debt securities [Line Items]    
Amortized cost of debt securities 78 36
Fair value of debt securities 78 37
UNITED STATES    
Financial assets at fair value through other comprehensive income debt securities [Line Items]    
Amortized cost of debt securities 5,332 3,900
Fair value of debt securities 5,159 3,926
UNITED STATES | Government agency debt securities [Member]    
Financial assets at fair value through other comprehensive income debt securities [Line Items]    
Amortized cost of debt securities 3,148 1,754
Fair value of debt securities 2,976 1,744
UNITED STATES | Central banks [Member]    
Financial assets at fair value through other comprehensive income debt securities [Line Items]    
Amortized cost of debt securities 0 0
Fair value of debt securities 0 0
UNITED STATES | credit institutions [Member]    
Financial assets at fair value through other comprehensive income debt securities [Line Items]    
Amortized cost of debt securities 120 114
Fair value of debt securities 120 116
UNITED STATES | Other issuers [Member]    
Financial assets at fair value through other comprehensive income debt securities [Line Items]    
Amortized cost of debt securities 2,065 2,032
Fair value of debt securities 2,063 2,065
TURKEY    
Financial assets at fair value through other comprehensive income debt securities [Line Items]    
Amortized cost of debt securities 3,195 2,888
Fair value of debt securities 3,928 2,920
TURKEY | Government agency debt securities [Member]    
Financial assets at fair value through other comprehensive income debt securities [Line Items]    
Amortized cost of debt securities 3,195 2,888
Fair value of debt securities 3,928 2,920
TURKEY | Central banks [Member]    
Financial assets at fair value through other comprehensive income debt securities [Line Items]    
Amortized cost of debt securities 0 0
Fair value of debt securities 0 0
TURKEY | credit institutions [Member]    
Financial assets at fair value through other comprehensive income debt securities [Line Items]    
Amortized cost of debt securities 0 0
Fair value of debt securities 0 0
TURKEY | Other issuers [Member]    
Financial assets at fair value through other comprehensive income debt securities [Line Items]    
Amortized cost of debt securities 0 0
Fair value of debt securities 0 0
Other Countries [Member]    
Financial assets at fair value through other comprehensive income debt securities [Line Items]    
Amortized cost of debt securities 12,245 10,298
Fair value of debt securities 12,152 10,529
Other Countries [Member] | Government agency debt securities [Member]    
Financial assets at fair value through other comprehensive income debt securities [Line Items]    
Amortized cost of debt securities 3,076 2,488
Fair value of debt securities 2,999 2,574
Other Countries [Member] | Central banks [Member]    
Financial assets at fair value through other comprehensive income debt securities [Line Items]    
Amortized cost of debt securities 3,338 1,698
Fair value of debt securities 3,339 1,696
Other Countries [Member] | credit institutions [Member]    
Financial assets at fair value through other comprehensive income debt securities [Line Items]    
Amortized cost of debt securities 2,196 2,306
Fair value of debt securities 2,192 2,382
Other Countries [Member] | Other issuers [Member]    
Financial assets at fair value through other comprehensive income debt securities [Line Items]    
Amortized cost of debt securities 3,635 3,807
Fair value of debt securities 3,622 3,877
Total foreign [Member]    
Financial assets at fair value through other comprehensive income debt securities [Line Items]    
Amortized cost of debt securities 43,003 40,551
Fair value of debt securities € 42,639 € 40,719