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Note 8 Transfer between levels (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
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 € 107 € 596 € 524
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 107 596 524
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 115 887 683
Transfers into Level 3 of fair value hierarchy, assets 0 34 1
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 68 1 0
Transfers into Level 3 of fair value hierarchy, assets 14 135 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 0 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 1,425 1,191 1,723
Transfers into Level 3 of fair value hierarchy, assets 17 21 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 1,608 2,079 2,407
Transfers into Level 3 of fair value hierarchy, assets 31 190 1
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 461 36 239
Transfers out of level 2 into level 3 45 177 141
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 3 301 660 221
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 25
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 461 36 239
Transfers out of level 2 into level 3 346 837 387
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 1,238 89 1,909
Transfers out of level 2 into level 3 78 666 340
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 1 0 243
Transfers out of level 2 into level 3 0 70 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 1 0 123
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 1,348 1,296 715
Transfers out of level 2 into level 3 12 205 0
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 0
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 2,586 1,385 2,990
Transfers out of level 2 into level 3 90 941 340
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 11 1 0
Transfers out of level 3 into level 2 of fair value hierarchy liabilities 380 372 258
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 121 262 55
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 11 1 0
Transfers out of level 3 into level 2 of fair value hierarchy liabilities 501 635 313
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 16 0 24
Transfers out of level 3 into level 2 of fair value hierarchy assets 199 497 911
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 35 0 53
Transfers out of level 3 into level 2 of fair value hierarchy assets 18 0 2
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 13 103 18
Transfers out of level 3 into level 2 of fair value hierarchy assets 170 243 83
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 64 103 95
Transfers out of level 3 into level 2 of fair value hierarchy assets € 387 € 740 € 996