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Note 14 Debt securities at amortized cost (Details) - EUR (€)
€ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Debt securities at amortized cost [Line Items]      
Amortized cost of debt securities at amortized cost € 43,606 € 34,781 € 35,737
Unrealized gains of debt securities at amortized cost 56 1,950 2,405
Unrealized losses of debt securities at amortized cost (1,701) (284) (75)
Fair value of debt securities at amortized cost 41,961 36,447 38,067
Domestic debt securities [Member]      
Debt securities at amortized cost [Line Items]      
Amortized cost of debt securities at amortized cost 18,541 18,031 18,492
Unrealized gains of debt securities at amortized cost 11 1,336 1,271
Unrealized losses of debt securities at amortized cost (1,348) (13) (7)
Fair value of debt securities at amortized cost 17,204 19,353 19,756
Domestic debt securities [Member] | Government [member]      
Debt securities at amortized cost [Line Items]      
Amortized cost of debt securities at amortized cost 18,397 17,693 13,656
Unrealized gains of debt securities at amortized cost 10 1,326 1,212
Unrealized losses of debt securities at amortized cost (1,330) (7) 0
Fair value of debt securities at amortized cost 17,077 19,013 14,868
Domestic debt securities [Member] | Central banks [Member]      
Debt securities at amortized cost [Line Items]      
Amortized cost of debt securities at amortized cost 0 0 0
Unrealized gains of debt securities at amortized cost 0 0 0
Unrealized losses of debt securities at amortized cost 0 0 0
Fair value of debt securities at amortized cost 0 0 0
Domestic debt securities [Member] | credit institutions [Member]      
Debt securities at amortized cost [Line Items]      
Amortized cost of debt securities at amortized cost 0 0 0
Unrealized gains of debt securities at amortized cost 0 0 0
Unrealized losses of debt securities at amortized cost 0 0 0
Fair value of debt securities at amortized cost 0 0 0
Domestic debt securities [Member] | Other issuers [Member]      
Debt securities at amortized cost [Line Items]      
Amortized cost of debt securities at amortized cost 144 337 4,835
Unrealized gains of debt securities at amortized cost 1 10 59
Unrealized losses of debt securities at amortized cost (18) (6) (7)
Fair value of debt securities at amortized cost 127 341 4,887
MEXICO      
Debt securities at amortized cost [Line Items]      
Amortized cost of debt securities at amortized cost 10,743 8,464 7,771
Unrealized gains of debt securities at amortized cost 0 182 534
Unrealized losses of debt securities at amortized cost 0 (138) (16)
Fair value of debt securities at amortized cost 10,743 8,508 8,289
MEXICO | Government [member]      
Debt securities at amortized cost [Line Items]      
Amortized cost of debt securities at amortized cost 9,806 7,669 6,963
Unrealized gains of debt securities at amortized cost 0 170 479
Unrealized losses of debt securities at amortized cost 0 (131) 0
Fair value of debt securities at amortized cost 9,806 7,708 7,442
MEXICO | Central banks [Member]      
Debt securities at amortized cost [Line Items]      
Amortized cost of debt securities at amortized cost 0 0 0
Unrealized gains of debt securities at amortized cost 0 0 0
Unrealized losses of debt securities at amortized cost 0 0 0
Fair value of debt securities at amortized cost 0 0 0
MEXICO | credit institutions [Member]      
Debt securities at amortized cost [Line Items]      
Amortized cost of debt securities at amortized cost 745 614 632
Unrealized gains of debt securities at amortized cost 0 11 55
Unrealized losses of debt securities at amortized cost 0 0 0
Fair value of debt securities at amortized cost 745 625 687
MEXICO | Other issuers [Member]      
Debt securities at amortized cost [Line Items]      
Amortized cost of debt securities at amortized cost 192 181 176
Unrealized gains of debt securities at amortized cost 0 1 0
Unrealized losses of debt securities at amortized cost 0 (7) (16)
Fair value of debt securities at amortized cost 192 175 160
UNITED STATES      
Debt securities at amortized cost [Line Items]      
Amortized cost of debt securities at amortized cost 2,412 93 52
Unrealized gains of debt securities at amortized cost 0 0 0
Unrealized losses of debt securities at amortized cost (10) 0 (26)
Fair value of debt securities at amortized cost 2,402 93 26
UNITED STATES | Government [member]      
Debt securities at amortized cost [Line Items]      
Amortized cost of debt securities at amortized cost 2,159 10 14
Unrealized gains of debt securities at amortized cost 0 0 0
Unrealized losses of debt securities at amortized cost (5) 0 0
Fair value of debt securities at amortized cost 2,154 10 14
UNITED STATES | Central banks [Member]      
Debt securities at amortized cost [Line Items]      
Amortized cost of debt securities at amortized cost 0 0 0
Unrealized gains of debt securities at amortized cost 0 0 0
Unrealized losses of debt securities at amortized cost 0 0 0
Fair value of debt securities at amortized cost 0 0 0
UNITED STATES | credit institutions [Member]      
Debt securities at amortized cost [Line Items]      
Amortized cost of debt securities at amortized cost 28 26 23
Unrealized gains of debt securities at amortized cost 0 0 0
Unrealized losses of debt securities at amortized cost (2) 0 (16)
Fair value of debt securities at amortized cost 27 26 7
UNITED STATES | Other issuers [Member]      
Debt securities at amortized cost [Line Items]      
Amortized cost of debt securities at amortized cost 224 57 15
Unrealized gains of debt securities at amortized cost 0 0 0
Unrealized losses of debt securities at amortized cost (3) 0 (10)
Fair value of debt securities at amortized cost 221 57 5
TURKEY      
Debt securities at amortized cost [Line Items]      
Amortized cost of debt securities at amortized cost 5,332 2,634 3,628
Unrealized gains of debt securities at amortized cost 0 143 95
Unrealized losses of debt securities at amortized cost 0 (95) (25)
Fair value of debt securities at amortized cost 5,332 2,682 3,698
TURKEY | Government [member]      
Debt securities at amortized cost [Line Items]      
Amortized cost of debt securities at amortized cost 5,325 2,628 3,621
Unrealized gains of debt securities at amortized cost 0 143 95
Unrealized losses of debt securities at amortized cost 0 (95) (25)
Fair value of debt securities at amortized cost 5,325 2,676 3,691
TURKEY | Central banks [Member]      
Debt securities at amortized cost [Line Items]      
Amortized cost of debt securities at amortized cost 0 0 0
Unrealized gains of debt securities at amortized cost 0 0 0
Unrealized losses of debt securities at amortized cost 0 0 0
Fair value of debt securities at amortized cost 0 0 0
TURKEY | credit institutions [Member]      
Debt securities at amortized cost [Line Items]      
Amortized cost of debt securities at amortized cost 6 5 6
Unrealized gains of debt securities at amortized cost 0 0 0
Unrealized losses of debt securities at amortized cost 0 0 0
Fair value of debt securities at amortized cost 6 5 6
TURKEY | Other issuers [Member]      
Debt securities at amortized cost [Line Items]      
Amortized cost of debt securities at amortized cost 0 0 1
Unrealized gains of debt securities at amortized cost 0 0 0
Unrealized losses of debt securities at amortized cost 0 0 0
Fair value of debt securities at amortized cost 0 0 1
Other Countries [Member]      
Debt securities at amortized cost [Line Items]      
Amortized cost of debt securities at amortized cost 6,578 5,559 5,795
Unrealized gains of debt securities at amortized cost 44 289 505
Unrealized losses of debt securities at amortized cost (343) (37) (1)
Fair value of debt securities at amortized cost 6,280 5,812 6,299
Other Countries [Member] | Government [member]      
Debt securities at amortized cost [Line Items]      
Amortized cost of debt securities at amortized cost 4,701 4,144 4,473
Unrealized gains of debt securities at amortized cost 32 257 467
Unrealized losses of debt securities at amortized cost (311) (28) (1)
Fair value of debt securities at amortized cost 4,423 4,374 4,939
Other Countries [Member] | Central banks [Member]      
Debt securities at amortized cost [Line Items]      
Amortized cost of debt securities at amortized cost 21 0 0
Unrealized gains of debt securities at amortized cost 0 0 0
Unrealized losses of debt securities at amortized cost (1) 0 0
Fair value of debt securities at amortized cost 21 0 0
Other Countries [Member] | credit institutions [Member]      
Debt securities at amortized cost [Line Items]      
Amortized cost of debt securities at amortized cost 397 171 122
Unrealized gains of debt securities at amortized cost 2 0 0
Unrealized losses of debt securities at amortized cost (11) 0 0
Fair value of debt securities at amortized cost 389 171 122
Other Countries [Member] | Other issuers [Member]      
Debt securities at amortized cost [Line Items]      
Amortized cost of debt securities at amortized cost 1,458 1,243 1,200
Unrealized gains of debt securities at amortized cost 10 32 38
Unrealized losses of debt securities at amortized cost (21) (9) 0
Fair value of debt securities at amortized cost 1,448 1,267 1,238
Foreign debt securities [Member]      
Debt securities at amortized cost [Line Items]      
Amortized cost of debt securities at amortized cost 25,065 16,750 17,245
Unrealized gains of debt securities at amortized cost 45 614 1,134
Unrealized losses of debt securities at amortized cost (353) (270) (68)
Fair value of debt securities at amortized cost € 24,757 € 17,094 € 18,311