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Note 6 Maximum Exposure to Credit Risk (Details) - EUR (€)
Jun. 30, 2021
Dec. 31, 2020
Total stage [Member]    
Credit Exposure Classes of Financial Instruments [Line Items]    
Maximum exposure to credit risk € 739,890,000,000 € 749,524,000,000
Total stage [Member] | Financial assets held for trading [Member]    
Credit Exposure Classes of Financial Instruments [Line Items]    
Maximum exposure to credit risk 76,852,000,000 68,075,000,000
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 25,116,000,000 23,970,000,000
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 14,315,000,000 11,458,000,000
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 37,421,000,000 32,647,000,000
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 5,742,000,000 5,198,000,000
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 194,000,000 356,000,000
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 4,827,000,000 4,133,000,000
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 722,000,000 709,000,000
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 1,107,000,000 1,117,000,000
Total stage [Member] | Derivatives [member]    
Credit Exposure Classes of Financial Instruments [Line Items]    
Maximum exposure to credit risk 43,528,000,000 46,302,000,000
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 73,252,000,000 69,537,000,000
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 71,877,000,000 68,404,000,000
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 1,347,000,000 1,100,000,000
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
Total stage [Member] | Financial assets at amortised cost, category [member]    
Credit Exposure Classes of Financial Instruments [Line Items]    
Maximum exposure to credit risk 379,722,000,000 379,857,000,000
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 35,375,000,000 35,785,000,000
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 5,098,000,000 6,229,000,000
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 11,877,000,000 14,591,000,000
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 327,372,000,000 323,252,000,000
Total stage [Member] | Total financial assets risk [Member]    
Credit Exposure Classes of Financial Instruments [Line Items]    
Maximum exposure to credit risk 580,202,000,000 570,084,000,000
Total stage [Member] | Total loan commitments and financial guarantees [Member]    
Credit Exposure Classes of Financial Instruments [Line Items]    
Maximum exposure to credit risk 159,688,000,000 179,440,000,000
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 112,127,000,000 132,584,000,000
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 10,937,000,000 10,665,000,000
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 36,624,000,000 36,190,000,000
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 71,531,000,000 67,995,000,000
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
Stage 1 [Member] | Financial assets at amortised cost, category [member]    
Credit Exposure Classes of Financial Instruments [Line Items]    
Maximum exposure to credit risk 332,953,000,000 334,552,000,000
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 35,199,000,000 35,759,000,000
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 5,098,000,000 6,229,000,000
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 11,858,000,000 14,565,000,000
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 280,797,000,000 277,998,000,000
Stage 1 [Member] | Total financial assets risk [Member]    
Credit Exposure Classes of Financial Instruments [Line Items]    
Maximum exposure to credit risk 0 0
Stage 1 [Member] | Total loan commitments and financial guarantees [Member]    
Credit Exposure Classes of Financial Instruments [Line Items]    
Maximum exposure to credit risk 148,865,000,000 165,726,000,000
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 106,241,000,000 124,104,000,000
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 9,620,000,000 9,208,000,000
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 33,004,000,000 32,414,000,000
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 345,000,000 410,000,000
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
Stage 2 [Member] | Financial assets at amortised cost, category [member]    
Credit Exposure Classes of Financial Instruments [Line Items]    
Maximum exposure to credit risk 31,734,000,000 30,607,000,000
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 157,000,000 6,000,000
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
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 15,000,000 20,000,000
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 31,562,000,000 30,581,000,000
Stage 2 [Member] | Total financial assets risk [Member]    
Credit Exposure Classes of Financial Instruments [Line Items]    
Maximum exposure to credit risk 0 0
Stage 2 [Member] | Total loan commitments and financial guarantees [Member]    
Credit Exposure Classes of Financial Instruments [Line Items]    
Maximum exposure to credit risk 10,019,000,000 12,682,000,000
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 5,745,000,000 8,214,000,000
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 1,044,000,000 1,168,000,000
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 3,231,000,000 3,300,000,000
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
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
Stage 3 [Member] | Financial assets at amortised cost, category [member]    
Credit Exposure Classes of Financial Instruments [Line Items]    
Maximum exposure to credit risk 15,036,000,000 14,698,000,000
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 19,000,000 20,000,000
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
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 4,000,000 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 15,013,000,000 14,672,000,000
Stage 3 [Member] | Total financial assets risk [Member]    
Credit Exposure Classes of Financial Instruments [Line Items]    
Maximum exposure to credit risk 0 0
Stage 3 [Member] | Total loan commitments and financial guarantees [Member]    
Credit Exposure Classes of Financial Instruments [Line Items]    
Maximum exposure to credit risk 804,000,000 1,032,000,000
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 141,000,000 265,000,000
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 273,000,000 290,000,000
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 € 389,000,000 € 477,000,000