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Note 8 Transfer between levels (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Level 1 Of Fair Value Hierarchy [Member] | Financial liabilities held for trading [Member]      
Level transfers [Line Items]      
Transfers out of Level 1 into Level 2 of fair value hierarchy, liabilities held at end of reporting period € 562 € 8 € 1
Transfers into Level 3 of fair value hierarchy, liabilities 0 3 0
Level 1 Of Fair Value Hierarchy [Member] | Financial liabilities at fair value through profit or loss that meet definition of held for trading, category [member]      
Level transfers [Line Items]      
Transfers out of Level 1 into Level 2 of fair value hierarchy, liabilities held at end of reporting period 0 0 0
Transfers into Level 3 of fair value hierarchy, liabilities 0 0 0
Level 1 Of Fair Value Hierarchy [Member] | Derivatives [member]      
Level transfers [Line Items]      
Transfers out of Level 1 into Level 2 of fair value hierarchy, liabilities held at end of reporting period 0 0 0
Transfers into Level 3 of fair value hierarchy, liabilities 0 0 0
Level 1 Of Fair Value Hierarchy [Member] | Total transferred financial liabilities [Member]      
Level transfers [Line Items]      
Transfers out of Level 1 into Level 2 of fair value hierarchy, liabilities held at end of reporting period 562 8 1
Transfers into Level 3 of fair value hierarchy, liabilities 0 3 0
Level 1 Of Fair Value Hierarchy [Member] | Financial assets held for trading [Member]      
Level transfers [Line Items]      
Transfers out of Level 1 into Level 2 of fair value hierarchy, assets held at end of reporting period 924 1,460 74
Transfers into Level 3 of fair value hierarchy, assets 2 11 0
Level 1 Of Fair Value Hierarchy [Member] | Non trading financial assets mandatorily at fair value through profit or loss [Member]      
Level transfers [Line Items]      
Transfers out of Level 1 into Level 2 of fair value hierarchy, assets held at end of reporting period 8 9 0
Transfers into Level 3 of fair value hierarchy, assets 0 11 0
Level 1 Of Fair Value Hierarchy [Member] | Financial assets at fair value through profit or loss, category [member]      
Level transfers [Line Items]      
Transfers out of Level 1 into Level 2 of fair value hierarchy, assets held at end of reporting period 0 143 0
Transfers into Level 3 of fair value hierarchy, assets 0 0 0
Level 1 Of Fair Value Hierarchy [Member] | Financial assets at fair value through other comprehensive income, category [member]      
Level transfers [Line Items]      
Transfers out of Level 1 into Level 2 of fair value hierarchy, assets held at end of reporting period 596 484 6
Transfers into Level 3 of fair value hierarchy, assets 17 0 6
Level 1 Of Fair Value Hierarchy [Member] | Derivatives [member]      
Level transfers [Line Items]      
Transfers out of Level 1 into Level 2 of fair value hierarchy, assets held at end of reporting period 0 0 0
Transfers into Level 3 of fair value hierarchy, assets 0 0 0
Level 1 Of Fair Value Hierarchy [Member] | Total transferred financial assets [Member]      
Level transfers [Line Items]      
Transfers out of Level 1 into Level 2 of fair value hierarchy, assets held at end of reporting period 1,528 2,096 79
Transfers into Level 3 of fair value hierarchy, assets 19 22 6
Level 2 Of Fair Value Hierarchy [Member] | Financial liabilities held for trading [Member]      
Level transfers [Line Items]      
Transfers out of Level 2 into Level 1 of fair value hierarchy, liabilities held at end of reporting period 24 0 0
Transfers out of level 2 into level 3 57 180 0
Level 2 Of Fair Value Hierarchy [Member] | Financial liabilities at fair value through profit or loss that meet definition of held for trading, category [member]      
Level transfers [Line Items]      
Transfers out of Level 2 into Level 1 of fair value hierarchy, liabilities held at end of reporting period 0 0 0
Transfers out of level 2 into level 3 38 56 27
Level 2 Of Fair Value Hierarchy [Member] | Derivatives [member]      
Level transfers [Line Items]      
Transfers out of Level 2 into Level 1 of fair value hierarchy, liabilities held at end of reporting period 0 0 0
Transfers out of level 2 into level 3 0 0 27
Level 2 Of Fair Value Hierarchy [Member] | Total transferred financial liabilities [Member]      
Level transfers [Line Items]      
Transfers out of Level 2 into Level 1 of fair value hierarchy, liabilities held at end of reporting period 24 0 0
Transfers out of level 2 into level 3 95 236 54
Level 2 Of Fair Value Hierarchy [Member] | Financial assets held for trading [Member]      
Level transfers [Line Items]      
Transfers out of Level 2 into Level 1 of fair value hierarchy, assets held at end of reporting period 35 203 1,119
Transfers out of level 2 into level 3 184 548 502
Level 2 Of Fair Value Hierarchy [Member] | Non trading financial assets mandatorily at fair value through profit or loss [Member]      
Level transfers [Line Items]      
Transfers out of Level 2 into Level 1 of fair value hierarchy, assets held at end of reporting period 0 4 23
Transfers out of level 2 into level 3 0 0 2
Level 2 Of Fair Value Hierarchy [Member] | Financial assets at fair value through profit or loss, category [member]      
Level transfers [Line Items]      
Transfers out of Level 2 into Level 1 of fair value hierarchy, assets held at end of reporting period 0 0 0
Transfers out of level 2 into level 3 0 0 0
Level 2 Of Fair Value Hierarchy [Member] | Financial assets at fair value through other comprehensive income, category [member]      
Level transfers [Line Items]      
Transfers out of Level 2 into Level 1 of fair value hierarchy, assets held at end of reporting period 506 135 4
Transfers out of level 2 into level 3 50 96 209
Level 2 Of Fair Value Hierarchy [Member] | Derivatives [member]      
Level transfers [Line Items]      
Transfers out of Level 2 into Level 1 of fair value hierarchy, assets held at end of reporting period 0 0 0
Transfers out of level 2 into level 3 0 8 26
Level 2 Of Fair Value Hierarchy [Member] | Total transferred financial assets [Member]      
Level transfers [Line Items]      
Transfers out of Level 2 into Level 1 of fair value hierarchy, assets held at end of reporting period 542 342 1,145
Transfers out of level 2 into level 3 234 652 739
Level 3 Of Fair Value Hierarchy [Member] | Financial liabilities held for trading [Member]      
Level transfers [Line Items]      
Transfers out of Level 3 of fair value hierarchy, liabilities 15 0 0
Transfers out of level 3 into level 2 of fair value hierarchy liabilities 95 13 0
Level 3 Of Fair Value Hierarchy [Member] | Financial liabilities at fair value through profit or loss that meet definition of held for trading, category [member]      
Level transfers [Line Items]      
Transfers out of Level 3 of fair value hierarchy, liabilities 0 0 0
Transfers out of level 3 into level 2 of fair value hierarchy liabilities 65 27 2,679
Level 3 Of Fair Value Hierarchy [Member] | Derivatives [member]      
Level transfers [Line Items]      
Transfers out of Level 3 of fair value hierarchy, liabilities 0 0 0
Transfers out of level 3 into level 2 of fair value hierarchy liabilities 0 0 125
Level 3 Of Fair Value Hierarchy [Member] | Total transferred financial liabilities [Member]      
Level transfers [Line Items]      
Transfers out of Level 3 of fair value hierarchy, liabilities 15 0 0
Transfers out of level 3 into level 2 of fair value hierarchy liabilities 160 40 2,804
Level 3 Of Fair Value Hierarchy [Member] | Financial assets held for trading [Member]      
Level transfers [Line Items]      
Transfers out of Level 3 of fair value hierarchy, assets 10 4 1
Transfers out of level 3 into level 2 of fair value hierarchy assets 637 98 160
Level 3 Of Fair Value Hierarchy [Member] | Non trading financial assets mandatorily at fair value through profit or loss [Member]      
Level transfers [Line Items]      
Transfers out of Level 3 of fair value hierarchy, assets 14 0 0
Transfers out of level 3 into level 2 of fair value hierarchy assets 23 17 44
Level 3 Of Fair Value Hierarchy [Member] | Financial assets at fair value through profit or loss, category [member]      
Level transfers [Line Items]      
Transfers out of Level 3 of fair value hierarchy, assets 0 0 1
Transfers out of level 3 into level 2 of fair value hierarchy assets 0 0 0
Level 3 Of Fair Value Hierarchy [Member] | Financial assets at fair value through other comprehensive income, category [member]      
Level transfers [Line Items]      
Transfers out of Level 3 of fair value hierarchy, assets 0 0 0
Transfers out of level 3 into level 2 of fair value hierarchy assets 6 6 454
Level 3 Of Fair Value Hierarchy [Member] | Derivatives [member]      
Level transfers [Line Items]      
Transfers out of Level 3 of fair value hierarchy, assets 0 0 0
Transfers out of level 3 into level 2 of fair value hierarchy assets 0 0 10
Level 3 Of Fair Value Hierarchy [Member] | Total transferred financial assets [Member]      
Level transfers [Line Items]      
Transfers out of Level 3 of fair value hierarchy, assets 24 4 2
Transfers out of level 3 into level 2 of fair value hierarchy assets € 665 € 121 € 667