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Note 13 Financial assets at fair value through other comprehensive income debt securities (Details) - EUR (€)
€ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Amortized cost of debt securities € 58,605 € 58,176 € 66,356
Unrealized gains of debt securities 1,165 1,511 2,089
Unrealized losses of debt securities (2,014) (614) (137)
Fair value of debt securities 57,755 59,074 68,308
Issued in euros [Member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Amortized cost of debt securities 19,164 17,625 30,811
Unrealized gains of debt securities 169 731 917
Unrealized losses of debt securities (555) (2) (17)
Fair value of debt securities 18,779 18,355 31,712
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 17,799 15,889 28,582
Unrealized gains of debt securities 154 656 801
Unrealized losses of debt securities (524) 0 (16)
Fair value of debt securities 17,429 16,544 29,367
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 865 1,125 1,363
Unrealized gains of debt securities 10 51 76
Unrealized losses of debt securities (20) 0 0
Fair value of debt securities 854 1,176 1,439
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 500 612 867
Unrealized gains of debt securities 5 24 40
Unrealized losses of debt securities (10) (1) (1)
Fair value of debt securities 495 635 906
MEXICO      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Amortized cost of debt securities 11,566 11,097 9,107
Unrealized gains of debt securities 3 32 291
Unrealized losses of debt securities (759) (359) (3)
Fair value of debt securities 10,810 10,769 9,395
MEXICO | Government agency debt securities [Member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Amortized cost of debt securities 11,013 10,467 8,309
Unrealized gains of debt securities 2 21 271
Unrealized losses of debt securities (736) (348) (1)
Fair value of debt securities 10,278 10,141 8,579
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 130 120 113
Unrealized gains of debt securities 0 3 5
Unrealized losses of debt securities (10) (6) 0
Fair value of debt securities 119 118 118
MEXICO | Other issuers [Member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Amortized cost of debt securities 423 509 685
Unrealized gains of debt securities 2 7 15
Unrealized losses of debt securities (12) (6) (2)
Fair value of debt securities 413 510 698
ITALY      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Amortized cost of debt securities 4,568 7,407 3,897
Unrealized gains of debt securities 53 213 367
Unrealized losses of debt securities (106) (12) 0
Fair value of debt securities 4,515 7,608 4,263
ITALY | Government agency debt securities [Member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Amortized cost of debt securities 4,402 7,274 3,789
Unrealized gains of debt securities 52 212 366
Unrealized losses of debt securities (104) (12) 0
Fair value of debt securities 4,349 7,474 4,154
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 39 47 48
Unrealized gains of debt securities 0 0 0
Unrealized losses of debt securities 0 0 0
Fair value of debt securities 39 47 48
ITALY | Other issuers [Member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Amortized cost of debt securities 127 86 60
Unrealized gains of debt securities 1 1 1
Unrealized losses of debt securities (1) 0 0
Fair value of debt securities 126 87 61
JAPAN      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Amortized cost of debt securities 2,920 4,961 4,551
Unrealized gains of debt securities 7 7 1
Unrealized losses of debt securities (1) 0 (3)
Fair value of debt securities 2,926 4,968 4,549
JAPAN | Government agency debt securities [Member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Amortized cost of debt securities 2,824 4,906 4,492
Unrealized gains of debt securities 6 7 0
Unrealized losses of debt securities 0 0 (3)
Fair value of debt securities 2,830 4,913 4,489
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 14 18 0
Unrealized gains of debt securities 0 0 0
Unrealized losses of debt securities (1) 0 0
Fair value of debt securities 13 18 0
JAPAN | Other issuers [Member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Amortized cost of debt securities 82 36 59
Unrealized gains of debt securities 1 1 1
Unrealized losses of debt securities 0 0 0
Fair value of debt securities 83 37 60
UNITED STATES      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Amortized cost of debt securities 5,245 3,900 4,642
Unrealized gains of debt securities 39 44 52
Unrealized losses of debt securities (263) (18) (3)
Fair value of debt securities 5,020 3,926 4,691
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 2,956 1,754 2,307
Unrealized gains of debt securities 17 7 9
Unrealized losses of debt securities (257) (17) (1)
Fair value of debt securities 2,716 1,744 2,315
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 89 114 186
Unrealized gains of debt securities 1 2 3
Unrealized losses of debt securities 0 0 0
Fair value of debt securities 89 116 188
UNITED STATES | Other issuers [Member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Amortized cost of debt securities 2,200 2,032 2,149
Unrealized gains of debt securities 21 35 40
Unrealized losses of debt securities (6) (1) (2)
Fair value of debt securities 2,215 2,065 2,187
TURKEY      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Amortized cost of debt securities 3,213 2,888 3,456
Unrealized gains of debt securities 700 199 90
Unrealized losses of debt securities (56) (168) (73)
Fair value of debt securities 3,858 2,920 3,473
TURKEY | Government agency debt securities [Member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Amortized cost of debt securities 3,213 2,888 3,456
Unrealized gains of debt securities 700 199 90
Unrealized losses of debt securities (56) (168) (73)
Fair value of debt securities 3,858 2,920 3,473
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 11,928 10,298 9,892
Unrealized gains of debt securities 194 286 372
Unrealized losses of debt securities (274) (55) (39)
Fair value of debt securities 11,848 10,529 10,225
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 3,093 2,488 2,177
Unrealized gains of debt securities 120 115 136
Unrealized losses of debt securities (154) (29) (14)
Fair value of debt securities 3,059 2,574 2,300
Other Countries [Member] | Central banks [Member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Amortized cost of debt securities 3,098 1,698 1,599
Unrealized gains of debt securities 8 3 21
Unrealized losses of debt securities (12) (5) (8)
Fair value of debt securities 3,094 1,696 1,611
Other Countries [Member] | credit institutions [Member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Amortized cost of debt securities 2,087 2,306 2,468
Unrealized gains of debt securities 40 92 116
Unrealized losses of debt securities (59) (16) (8)
Fair value of debt securities 2,068 2,382 2,576
Other Countries [Member] | Other issuers [Member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Amortized cost of debt securities 3,649 3,807 3,648
Unrealized gains of debt securities 27 76 99
Unrealized losses of debt securities (49) (6) (8)
Fair value of debt securities 3,627 3,877 3,738
Total foreign [Member]      
Financial assets at fair value through other comprehensive income debt securities [Line Items]      
Amortized cost of debt securities 39,440 40,551 35,545
Unrealized gains of debt securities 996 780 1,172
Unrealized losses of debt securities (1,459) (612) (120)
Fair value of debt securities € 38,977 € 40,719 € 36,596