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Note 14 Debt securities at amortized cost (Details) - EUR (€)
€ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Debt securities at amortized cost [Line Items]      
Amortized cost of debt securities at amortized cost € 34,781 € 35,737 € 38,877
Unrealized gains of debt securities at amortized cost 1,950 2,405 1,077
Unrealized losses of debt securities at amortized cost (284) (75) (160)
Fair value of debt securities at amortized cost 36,447 38,067 39,796
Domestic debt securities [Member]      
Debt securities at amortized cost [Line Items]      
Amortized cost of debt securities at amortized cost 18,031 18,492 17,684
Unrealized gains of debt securities at amortized cost 1,336 1,271 668
Unrealized losses of debt securities at amortized cost (13) (7) (31)
Fair value of debt securities at amortized cost 19,353 19,756 18,320
Domestic debt securities [Member] | Government [member]      
Debt securities at amortized cost [Line Items]      
Amortized cost of debt securities at amortized cost 17,693 13,656 12,755
Unrealized gains of debt securities at amortized cost 1,326 1,212 630
Unrealized losses of debt securities at amortized cost (7) 0 (21)
Fair value of debt securities at amortized cost 19,013 14,868 13,363
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 26
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 26
Domestic debt securities [Member] | Other issuers [Member]      
Debt securities at amortized cost [Line Items]      
Amortized cost of debt securities at amortized cost 337 4,835 4,903
Unrealized gains of debt securities at amortized cost 10 59 38
Unrealized losses of debt securities at amortized cost (6) (7) (10)
Fair value of debt securities at amortized cost 341 4,887 4,931
MEXICO      
Debt securities at amortized cost [Line Items]      
Amortized cost of debt securities at amortized cost 8,464 7,771 6,374
Unrealized gains of debt securities at amortized cost 182 534 168
Unrealized losses of debt securities at amortized cost (138) (16) (18)
Fair value of debt securities at amortized cost 8,508 8,289 6,525
MEXICO | Government [member]      
Debt securities at amortized cost [Line Items]      
Amortized cost of debt securities at amortized cost 7,669 6,963 5,576
Unrealized gains of debt securities at amortized cost 170 479 166
Unrealized losses of debt securities at amortized cost (131) 0 0
Fair value of debt securities at amortized cost 7,708 7,442 5,742
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 614 632 526
Unrealized gains of debt securities at amortized cost 11 55 2
Unrealized losses of debt securities at amortized cost 0 0 0
Fair value of debt securities at amortized cost 625 687 529
MEXICO | Other issuers [Member]      
Debt securities at amortized cost [Line Items]      
Amortized cost of debt securities at amortized cost 181 176 272
Unrealized gains of debt securities at amortized cost 1 0 0
Unrealized losses of debt securities at amortized cost (7) (16) (18)
Fair value of debt securities at amortized cost 175 160 254
UNITED STATES      
Debt securities at amortized cost [Line Items]      
Amortized cost of debt securities at amortized cost 93 52 6,125
Unrealized gains of debt securities at amortized cost 0 0 111
Unrealized losses of debt securities at amortized cost 0 (26) (20)
Fair value of debt securities at amortized cost 93 26 6,217
UNITED STATES | Government [member]      
Debt securities at amortized cost [Line Items]      
Amortized cost of debt securities at amortized cost 10 14 5,690
Unrealized gains of debt securities at amortized cost 0 0 111
Unrealized losses of debt securities at amortized cost 0 0 (18)
Fair value of debt securities at amortized cost 10 14 5,783
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 26 23 25
Unrealized gains of debt securities at amortized cost 0 0 0
Unrealized losses of debt securities at amortized cost 0 (16) (1)
Fair value of debt securities at amortized cost 26 7 25
UNITED STATES | Other issuers [Member]      
Debt securities at amortized cost [Line Items]      
Amortized cost of debt securities at amortized cost 57 15 410
Unrealized gains of debt securities at amortized cost 0 0 0
Unrealized losses of debt securities at amortized cost 0 (10) (1)
Fair value of debt securities at amortized cost 57 5 409
TURKEY      
Debt securities at amortized cost [Line Items]      
Amortized cost of debt securities at amortized cost 2,634 3,628 4,113
Unrealized gains of debt securities at amortized cost 143 95 48
Unrealized losses of debt securities at amortized cost (95) (25) (65)
Fair value of debt securities at amortized cost 2,682 3,698 4,097
TURKEY | Government [member]      
Debt securities at amortized cost [Line Items]      
Amortized cost of debt securities at amortized cost 2,628 3,621 4,105
Unrealized gains of debt securities at amortized cost 143 95 47
Unrealized losses of debt securities at amortized cost (95) (25) (65)
Fair value of debt securities at amortized cost 2,676 3,691 4,088
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 5 6 7
Unrealized gains of debt securities at amortized cost 0 0 1
Unrealized losses of debt securities at amortized cost 0 0 0
Fair value of debt securities at amortized cost 5 6 8
TURKEY | Other issuers [Member]      
Debt securities at amortized cost [Line Items]      
Amortized cost of debt securities at amortized cost 0 1 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 1 1
Other Countries [Member]      
Debt securities at amortized cost [Line Items]      
Amortized cost of debt securities at amortized cost 5,559 5,795 4,581
Unrealized gains of debt securities at amortized cost 289 505 82
Unrealized losses of debt securities at amortized cost (37) (1) (26)
Fair value of debt securities at amortized cost 5,812 6,299 4,637
Other Countries [Member] | Government [member]      
Debt securities at amortized cost [Line Items]      
Amortized cost of debt securities at amortized cost 4,144 4,473 3,400
Unrealized gains of debt securities at amortized cost 257 467 82
Unrealized losses of debt securities at amortized cost (28) (1) (22)
Fair value of debt securities at amortized cost 4,374 4,939 3,459
Other Countries [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
Other Countries [Member] | credit institutions [Member]      
Debt securities at amortized cost [Line Items]      
Amortized cost of debt securities at amortized cost 171 122 135
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 171 122 135
Other Countries [Member] | Other issuers [Member]      
Debt securities at amortized cost [Line Items]      
Amortized cost of debt securities at amortized cost 1,243 1,200 1,047
Unrealized gains of debt securities at amortized cost 32 38 0
Unrealized losses of debt securities at amortized cost (9) 0 (4)
Fair value of debt securities at amortized cost 1,267 1,238 1,043
Foreign debt securities [Member]      
Debt securities at amortized cost [Line Items]      
Amortized cost of debt securities at amortized cost 16,750 17,245 21,194
Unrealized gains of debt securities at amortized cost 614 1,134 409
Unrealized losses of debt securities at amortized cost (270) (68) (129)
Fair value of debt securities at amortized cost € 17,094 € 18,311 € 21,476