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Note 7 Maximum credit risk exposure, accumulated allowances and carrying amount by counterparty (Details) - Customers [member] - EUR (€)
€ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Public administration [Member]      
Maximum credit risk exposure to customers [Line Items]      
Maximum exposure to credit risk € (19,719) € (19,439) € (28,281)
Allowance account for credit losses of financial assets 37 48 59
Net amount 19,682 19,391 28,222
Other financial corporations [Member]      
Maximum credit risk exposure to customers [Line Items]      
Maximum exposure to credit risk (9,826) (9,856) (11,239)
Allowance account for credit losses of financial assets 23 39 31
Net amount 9,804 9,817 11,207
Non financial corporations [Member]      
Maximum credit risk exposure to customers [Line Items]      
Maximum exposure to credit risk (146,797) (142,547) (173,254)
Allowance account for credit losses of financial assets 5,804 6,123 6,465
Net amount 140,993 136,424 166,789
Households [Member]      
Maximum credit risk exposure to customers [Line Items]      
Maximum exposure to credit risk (153,714) (151,410) (181,989)
Allowance account for credit losses of financial assets 5,253 5,895 5,847
Net amount 148,461 145,515 176,142
Loans and advances to customers [Member]      
Maximum credit risk exposure to customers [Line Items]      
Maximum exposure to credit risk (330,055) (323,252) (394,763)
Allowance account for credit losses of financial assets 11,116 12,105 12,402
Net amount 318,939 311,147 382,360
Stage 1 [Member] | Public administration [Member]      
Maximum credit risk exposure to customers [Line Items]      
Maximum exposure to credit risk (19,287) (19,163) (27,511)
Allowance account for credit losses of financial assets 13 14 15
Net amount 19,274 19,149 27,496
Stage 1 [Member] | Other financial corporations [Member]      
Maximum credit risk exposure to customers [Line Items]      
Maximum exposure to credit risk (9,672) (9,747) (11,085)
Allowance account for credit losses of financial assets 8 25 19
Net amount 9,664 9,722 11,066
Stage 1 [Member] | Non financial corporations [Member]      
Maximum credit risk exposure to customers [Line Items]      
Maximum exposure to credit risk (120,140) (119,891) (148,768)
Allowance account for credit losses of financial assets 759 774 811
Net amount 119,381 119,117 147,957
Stage 1 [Member] | Households [Member]      
Maximum credit risk exposure to customers [Line Items]      
Maximum exposure to credit risk (132,096) (129,196) (158,085)
Allowance account for credit losses of financial assets 1,184 1,192 1,283
Net amount 130,912 128,005 156,801
Stage 1 [Member] | Loans and advances to customers [Member]      
Maximum credit risk exposure to customers [Line Items]      
Maximum exposure to credit risk (281,195) (277,998) (345,449)
Allowance account for credit losses of financial assets 1,964 2,005 2,129
Net amount 279,231 275,993 343,320
Stage 2 [Member] | Public administration [Member]      
Maximum credit risk exposure to customers [Line Items]      
Maximum exposure to credit risk (369) (200) (682)
Allowance account for credit losses of financial assets 5 9 22
Net amount 364 191 660
Stage 2 [Member] | Other financial corporations [Member]      
Maximum credit risk exposure to customers [Line Items]      
Maximum exposure to credit risk (131) (95) (136)
Allowance account for credit losses of financial assets 6 6 2
Net amount 125 88 134
Stage 2 [Member] | Non financial corporations [Member]      
Maximum credit risk exposure to customers [Line Items]      
Maximum exposure to credit risk (19,366) (15,179) (16,018)
Allowance account for credit losses of financial assets 1,306 1,110 904
Net amount 18,060 14,069 15,114
Stage 2 [Member] | Households [Member]      
Maximum credit risk exposure to customers [Line Items]      
Maximum exposure to credit risk (14,336) (15,108) (16,523)
Allowance account for credit losses of financial assets 773 1,161 1,252
Net amount 13,563 13,946 15,272
Stage 2 [Member] | Loans and advances to customers [Member]      
Maximum credit risk exposure to customers [Line Items]      
Maximum exposure to credit risk (34,203) (30,581) (33,360)
Allowance account for credit losses of financial assets 2,091 2,287 2,181
Net amount 32,112 28,294 31,179
Stage 3 [Member] | Public administration [Member]      
Maximum credit risk exposure to customers [Line Items]      
Maximum exposure to credit risk (62) (76) (88)
Allowance account for credit losses of financial assets 19 25 21
Net amount 43 51 66
Stage 3 [Member] | Other financial corporations [Member]      
Maximum credit risk exposure to customers [Line Items]      
Maximum exposure to credit risk (24) (14) (17)
Allowance account for credit losses of financial assets 9 7 10
Net amount 15 7 8
Stage 3 [Member] | Non financial corporations [Member]      
Maximum credit risk exposure to customers [Line Items]      
Maximum exposure to credit risk (7,290) (7,477) (8,468)
Allowance account for credit losses of financial assets 3,738 4,239 4,750
Net amount 3,552 3,238 3,718
Stage 3 [Member] | Households [Member]      
Maximum credit risk exposure to customers [Line Items]      
Maximum exposure to credit risk (7,281) (7,106) (7,381)
Allowance account for credit losses of financial assets 3,295 3,542 3,312
Net amount 3,986 3,564 4,069
Stage 3 [Member] | Loans and advances to customers [Member]      
Maximum credit risk exposure to customers [Line Items]      
Maximum exposure to credit risk (14,657) (14,672) (15,954)
Allowance account for credit losses of financial assets 7,061 7,813 8,093
Net amount € 7,596 € 6,860 € 7,861