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Note 13 Financial assets at fair value through other comprehensive income debt securities (Details) - EUR (€)
€ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Amortized cost of debt securities € 58,176 € 66,356 € 57,395
Unrealized gains of debt securities 1,511 2,089 1,617
Unrealized losses of debt securities (614) (137) (280)
Fair value of debt securities 59,074 68,308 58,731
Issued in euros [Member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Amortized cost of debt securities 17,625 30,811 22,607
Unrealized gains of debt securities 731 917 935
Unrealized losses of debt securities (2) (17) (21)
Fair value of debt securities 18,355 31,712 23,521
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 15,889 28,582 20,740
Unrealized gains of debt securities 656 801 830
Unrealized losses of debt securities 0 (16) (20)
Fair value of debt securities 16,544 29,367 21,550
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 0 0
Unrealized gains of debt securities 0 0 0
Unrealized losses of debt securities 0 0 0
Fair value of debt securities 0 0 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 1,125 1,363 959
Unrealized gains of debt securities 51 76 65
Unrealized losses of debt securities 0 0 0
Fair value of debt securities 1,176 1,439 1,024
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 612 867 907
Unrealized gains of debt securities 24 40 40
Unrealized losses of debt securities (1) (1) 0
Fair value of debt securities 635 906 947
MEXICO      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Amortized cost of debt securities 11,097 9,107 7,790
Unrealized gains of debt securities 32 291 22
Unrealized losses of debt securities (359) (3) (26)
Fair value of debt securities 10,769 9,395 7,786
MEXICO | Government agency debt securities [Member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Amortized cost of debt securities 10,467 8,309 6,869
Unrealized gains of debt securities 21 271 18
Unrealized losses of debt securities (348) (1) (19)
Fair value of debt securities 10,141 8,579 6,868
MEXICO | Central banks [Member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Amortized cost of debt securities 0 0 0
Unrealized gains of debt securities 0 0 0
Unrealized losses of debt securities 0 0 0
Fair value of debt securities 0 0 0
MEXICO | credit institutions [Member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Amortized cost of debt securities 120 113 77
Unrealized gains of debt securities 3 5 2
Unrealized losses of debt securities (6) 0 0
Fair value of debt securities 118 118 78
MEXICO | Other issuers [Member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Amortized cost of debt securities 509 685 843
Unrealized gains of debt securities 7 15 2
Unrealized losses of debt securities (6) (2) (6)
Fair value of debt securities 510 698 840
ITALY      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Amortized cost of debt securities 7,407 3,897 2,325
Unrealized gains of debt securities 213 367 244
Unrealized losses of debt securities (12) 0 (2)
Fair value of debt securities 7,608 4,263 2,567
ITALY | Government agency debt securities [Member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Amortized cost of debt securities 7,274 3,789 2,193
Unrealized gains of debt securities 212 366 244
Unrealized losses of debt securities (12) 0 (2)
Fair value of debt securities 7,474 4,154 2,435
ITALY | Central banks [Member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Amortized cost of debt securities 0 0 0
Unrealized gains of debt securities 0 0 0
Unrealized losses of debt securities 0 0 0
Fair value of debt securities 0 0 0
ITALY | credit institutions [Member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Amortized cost of debt securities 47 48 52
Unrealized gains of debt securities 0 0 0
Unrealized losses of debt securities 0 0 0
Fair value of debt securities 47 48 52
ITALY | Other issuers [Member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Amortized cost of debt securities 86 60 80
Unrealized gains of debt securities 1 1 1
Unrealized losses of debt securities 0 0 0
Fair value of debt securities 87 61 81
JAPAN      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Amortized cost of debt securities 4,961 4,551 2,735
Unrealized gains of debt securities 7 1 3
Unrealized losses of debt securities 0 (3) 0
Fair value of debt securities 4,968 4,549 2,738
JAPAN | Government agency debt securities [Member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Amortized cost of debt securities 4,906 4,492 2,691
Unrealized gains of debt securities 7 0 3
Unrealized losses of debt securities 0 (3) 0
Fair value of debt securities 4,913 4,489 2,694
JAPAN | Central banks [Member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Amortized cost of debt securities 0 0 0
Unrealized gains of debt securities 0 0 0
Unrealized losses of debt securities 0 0 0
Fair value of debt securities 0 0 0
JAPAN | credit institutions [Member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Amortized cost of debt securities 18 0 0
Unrealized gains of debt securities 0 0 0
Unrealized losses of debt securities 0 0 0
Fair value of debt securities 18 0 0
JAPAN | Other issuers [Member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Amortized cost of debt securities 36 59 43
Unrealized gains of debt securities 1 1 0
Unrealized losses of debt securities 0 0 0
Fair value of debt securities 37 60 44
UNITED STATES      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Amortized cost of debt securities 3,900 4,642 11,376
Unrealized gains of debt securities 44 52 68
Unrealized losses of debt securities (18) (3) (51)
Fair value of debt securities 3,926 4,691 11,393
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 1,754 2,307 8,570
Unrealized gains of debt securities 7 9 42
Unrealized losses of debt securities (17) (1) (12)
Fair value of debt securities 1,744 2,315 8,599
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 0
Unrealized gains of debt securities 0 0 0
Unrealized losses of debt securities 0 0 0
Fair value of debt securities 0 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 114 186 122
Unrealized gains of debt securities 2 3 2
Unrealized losses of debt securities 0 0 0
Fair value of debt securities 116 188 124
UNITED STATES | Other issuers [Member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Amortized cost of debt securities 2,032 2,149 2,684
Unrealized gains of debt securities 35 40 24
Unrealized losses of debt securities (1) (2) (39)
Fair value of debt securities 2,065 2,187 2,670
TURKEY      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Amortized cost of debt securities 2,888 3,456 3,752
Unrealized gains of debt securities 199 90 38
Unrealized losses of debt securities (168) (73) (76)
Fair value of debt securities 2,920 3,473 3,713
TURKEY | Government agency debt securities [Member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Amortized cost of debt securities 2,888 3,456 3,752
Unrealized gains of debt securities 199 90 38
Unrealized losses of debt securities (168) (73) (76)
Fair value of debt securities 2,920 3,473 3,713
TURKEY | Central banks [Member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Amortized cost of debt securities 0 0 0
Unrealized gains of debt securities 0 0 0
Unrealized losses of debt securities 0 0 0
Fair value of debt securities 0 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 0
Unrealized gains of debt securities 0 0 0
Unrealized losses of debt securities 0 0 0
Fair value of debt securities 0 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 0
Unrealized gains of debt securities 0 0 0
Unrealized losses of debt securities 0 0 0
Fair value of debt securities 0 0 0
Other Countries [Member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Amortized cost of debt securities 10,298 9,892 6,810
Unrealized gains of debt securities 286 372 307
Unrealized losses of debt securities (55) (39) (104)
Fair value of debt securities 10,529 10,225 7,013
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 2,488 2,177 2,079
Unrealized gains of debt securities 115 136 137
Unrealized losses of debt securities (29) (14) (76)
Fair value of debt securities 2,574 2,300 2,140
Other Countries [Member] | Central banks [Member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Amortized cost of debt securities 1,698 1,599 1,005
Unrealized gains of debt securities 3 21 9
Unrealized losses of debt securities (5) (8) (4)
Fair value of debt securities 1,696 1,611 1,010
Other Countries [Member] | credit institutions [Member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Amortized cost of debt securities 2,306 2,468 1,743
Unrealized gains of debt securities 92 116 109
Unrealized losses of debt securities (16) (8) (12)
Fair value of debt securities 2,382 2,576 1,840
Other Countries [Member] | Other issuers [Member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Amortized cost of debt securities 3,807 3,648 1,983
Unrealized gains of debt securities 76 99 52
Unrealized losses of debt securities (6) (8) (12)
Fair value of debt securities 3,877 3,738 2,023
Total foreign [Member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Amortized cost of debt securities 40,551 35,545 34,788
Unrealized gains of debt securities 780 1,172 681
Unrealized losses of debt securities (612) (120) (259)
Fair value of debt securities € 40,719 € 36,596 € 35,210