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Note 8 Transfer between levels (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
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 € 524 € 562 € 8
Transfers into Level 3 of fair value hierarchy, liabilities 0 0 3
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 524 562 8
Transfers into Level 3 of fair value hierarchy, liabilities 0 0 3
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 683 924 1,460
Transfers into Level 3 of fair value hierarchy, assets 1 2 11
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 0 8 9
Transfers into Level 3 of fair value hierarchy, assets 0 0 11
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 0 143
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 1,723 596 484
Transfers into Level 3 of fair value hierarchy, assets 0 17 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, 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 2,407 1,528 2,096
Transfers into Level 3 of fair value hierarchy, assets 1 19 22
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 239 24 0
Transfers out of level 2 into level 3 141 57 180
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 3 221 38 56
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 25 0 0
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 239 24 0
Transfers out of level 2 into level 3 387 95 236
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 1,909 35 203
Transfers out of level 2 into level 3 340 184 548
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 243 0 4
Transfers out of level 2 into level 3 0 0 0
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 123 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 715 506 135
Transfers out of level 2 into level 3 0 50 96
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 0 8
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 2,990 542 342
Transfers out of level 2 into level 3 340 234 652
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 0 15 0
Transfers out of level 3 into level 2 of fair value hierarchy liabilities 258 95 13
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 55 65 27
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 0
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 0 15 0
Transfers out of level 3 into level 2 of fair value hierarchy liabilities 313 160 40
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 24 10 4
Transfers out of level 3 into level 2 of fair value hierarchy assets 911 637 98
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 53 14 0
Transfers out of level 3 into level 2 of fair value hierarchy assets 2 23 17
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 0
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 18 0 0
Transfers out of level 3 into level 2 of fair value hierarchy assets 83 6 6
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 0
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 95 24 4
Transfers out of level 3 into level 2 of fair value hierarchy assets € 996 € 665 € 121