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Note 7 Maximum credit risk exposure (Details) - EUR (€)
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Total stage [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk € 753,730,000,000 € 747,145,000,000 € 807,520,000,000
Total stage [Member] | Financial assets held for trading [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 92,560,000,000 65,696,000,000 67,238,000,000
Total stage [Member] | Financial assets held for trading [Member] | equity instruments [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 15,963,000,000 11,458,000,000 8,892,000,000
Total stage [Member] | Financial assets held for trading [Member] | Debt securities [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 25,790,000,000 23,970,000,000 26,309,000,000
Total stage [Member] | Financial assets held for trading [Member] | loans and advances [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 50,807,000,000 30,268,000,000 32,037,000,000
Total stage [Member] | Non trading financial assets mandatorily at fair value through profit or loss [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 6,086,000,000 5,198,000,000 5,557,000,000
Total stage [Member] | Non trading financial assets mandatorily at fair value through profit or loss [Member] | equity instruments [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 5,303,000,000 4,133,000,000 1,120,000,000
Total stage [Member] | Non trading financial assets mandatorily at fair value through profit or loss [Member] | Debt securities [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 128,000,000 356,000,000 110,000,000
Total stage [Member] | Non trading financial assets mandatorily at fair value through profit or loss [Member] | loans and advances [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 655,000,000 709,000,000 4,327,000,000
Total stage [Member] | Financial assets designated at fair value through profit or loss [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 1,092,000,000 1,117,000,000 1,214,000,000
Total stage [Member] | Derivatives [member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 43,687,000,000 46,302,000,000 39,462,000,000
Total stage [Member] | Financial assets at fair value through other comprehensive income, category [member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 60,495,000,000 69,537,000,000 61,293,000,000
Total stage [Member] | Financial assets at fair value through other comprehensive income, category [member] | equity instruments [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 1,320,000,000 1,100,000,000 2,420,000,000
Total stage [Member] | Financial assets at fair value through other comprehensive income, category [member] | Debt securities [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 59,148,000,000 68,404,000,000 58,841,000,000
Total stage [Member] | Financial assets at fair value through other comprehensive income, category [member] | Loans and advances to credit institutions [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 27,000,000 33,000,000 33,000,000
Total stage [Member] | Financial assets at amortised cost, category [member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 383,870,000,000 379,857,000,000 451,640,000,000
Total stage [Member] | Financial assets at amortised cost, category [member] | Debt securities [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 34,833,000,000 35,785,000,000 38,930,000,000
Total stage [Member] | Financial assets at amortised cost, category [member] | Loans and advances to central banks [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 5,687,000,000 6,229,000,000 4,285,000,000
Total stage [Member] | Financial assets at amortised cost, category [member] | Loans and advances to credit institutions [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 13,295,000,000 14,591,000,000 13,664,000,000
Total stage [Member] | Financial assets at amortised cost, category [member] | Loans and advances to customers [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 330,055,000,000 323,252,000,000 394,763,000,000
Total stage [Member] | Total financial assets risk [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 587,789,000,000 567,705,000,000 626,404,000,000
Total stage [Member] | Total loan commitments and financial guarantees [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 165,941,000,000 179,440,000,000 181,116,000,000
Total stage [Member] | Total loan commitments and financial guarantees [Member] | Loan commitments given [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 119,618,000,000 132,584,000,000 130,923,000,000
Total stage [Member] | Total loan commitments and financial guarantees [Member] | Financial guarantees given [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 11,720,000,000 10,665,000,000 10,984,000,000
Total stage [Member] | Total loan commitments and financial guarantees [Member] | Other commitments given [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 34,604,000,000 36,190,000,000 39,209,000,000
Stage 1 [Member] | Financial assets at fair value through other comprehensive income, category [member] | Debt securities [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 58,587,000,000 67,995,000,000 58,590,000,000
Stage 1 [Member] | Financial assets at fair value through other comprehensive income, category [member] | Loans and advances to credit institutions [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 27,000,000 33,000,000 33,000,000
Stage 1 [Member] | Financial assets at amortised cost, category [member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 334,772,000,000 334,552,000,000 402,024,000,000
Stage 1 [Member] | Financial assets at amortised cost, category [member] | Debt securities [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 34,605,000,000 35,759,000,000 38,790,000,000
Stage 1 [Member] | Financial assets at amortised cost, category [member] | Loans and advances to central banks [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 5,687,000,000 6,229,000,000 4,285,000,000
Stage 1 [Member] | Financial assets at amortised cost, category [member] | Loans and advances to credit institutions [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 13,285,000,000 14,565,000,000 13,500,000,000
Stage 1 [Member] | Financial assets at amortised cost, category [member] | Loans and advances to customers [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 281,195,000,000 277,998,000,000 345,449,000,000
Stage 1 [Member] | Total loan commitments and financial guarantees [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 152,914,000,000 165,726,000,000 169,663,000,000
Stage 1 [Member] | Total loan commitments and financial guarantees [Member] | Loan commitments given [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 112,494,000,000 124,104,000,000 123,707,000,000
Stage 1 [Member] | Total loan commitments and financial guarantees [Member] | Financial guarantees given [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 10,146,000,000 9,208,000,000 9,804,000,000
Stage 1 [Member] | Total loan commitments and financial guarantees [Member] | Other commitments given [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 30,274,000,000 32,414,000,000 36,151,000,000
Stage 2 [Member] | Financial assets at fair value through other comprehensive income, category [member] | Debt securities [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 561,000,000 410,000,000 250,000,000
Stage 2 [Member] | Financial assets at fair value through other comprehensive income, category [member] | Loans and advances to credit institutions [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 0 0 0
Stage 2 [Member] | Financial assets at amortised cost, category [member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 34,418,000,000 30,607,000,000 33,624,000,000
Stage 2 [Member] | Financial assets at amortised cost, category [member] | Debt securities [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 205,000,000 6,000,000 106,000,000
Stage 2 [Member] | Financial assets at amortised cost, category [member] | Loans and advances to central banks [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 0 0 0
Stage 2 [Member] | Financial assets at amortised cost, category [member] | Loans and advances to credit institutions [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 10,000,000 20,000,000 158,000,000
Stage 2 [Member] | Financial assets at amortised cost, category [member] | Loans and advances to customers [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 34,203,000,000 30,581,000,000 33,360,000,000
Stage 2 [Member] | Total loan commitments and financial guarantees [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 12,070,000,000 12,682,000,000 10,452,000,000
Stage 2 [Member] | Total loan commitments and financial guarantees [Member] | Loan commitments given [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 6,953,000,000 8,214,000,000 6,945,000,000
Stage 2 [Member] | Total loan commitments and financial guarantees [Member] | Financial guarantees given [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 1,329,000,000 1,168,000,000 955,000,000
Stage 2 [Member] | Total loan commitments and financial guarantees [Member] | Other commitments given [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 3,789,000,000 3,300,000,000 2,552,000,000
Stage 3 [Member] | Financial assets at fair value through other comprehensive income, category [member] | Debt securities [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 0 0 0
Stage 3 [Member] | Financial assets at fair value through other comprehensive income, category [member] | Loans and advances to credit institutions [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 0 0 0
Stage 3 [Member] | Financial assets at amortised cost, category [member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 14,680,000,000 14,698,000,000 15,993,000,000
Stage 3 [Member] | Financial assets at amortised cost, category [member] | Debt securities [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 22,000,000 20,000,000 33,000,000
Stage 3 [Member] | Financial assets at amortised cost, category [member] | Loans and advances to central banks [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 0 0 0
Stage 3 [Member] | Financial assets at amortised cost, category [member] | Loans and advances to credit institutions [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 0 6,000,000 6,000,000
Stage 3 [Member] | Financial assets at amortised cost, category [member] | Loans and advances to customers [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 14,657,000,000 14,672,000,000 15,954,000,000
Stage 3 [Member] | Total loan commitments and financial guarantees [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 957,000,000 1,032,000,000 1,001,000,000
Stage 3 [Member] | Total loan commitments and financial guarantees [Member] | Loan commitments given [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 171,000,000 265,000,000 270,000,000
Stage 3 [Member] | Total loan commitments and financial guarantees [Member] | Financial guarantees given [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk 245,000,000 290,000,000 224,000,000
Stage 3 [Member] | Total loan commitments and financial guarantees [Member] | Other commitments given [Member]      
Credit Exposure Classes of Financial Instruments [Line Items]      
Maximum exposure to credit risk € 541,000,000 € 477,000,000 € 506,000,000