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Wholesale financing transactions carried out by group operations (Details)
€ in Millions
Dec. 31, 2024
EUR (€)
Jan-24 [Member] | 3.875% [Member] | Jan-34 [Member] | Euro Member Countries, Euro  
Type of Issue [Line Items]  
Senior preferred € 1,250
Feb-24 [Member] | 4.875% [Member] | Nov-30 to Feb-31 [Member] | Feb-36 [Member] | Euro Member Countries, Euro  
Type of Issue [Line Items]  
Tier 2 1,250
Mar-24 [Member] | 5.831% [Member] | Mar-29 [Member] | United States of America, Dollars  
Type of Issue [Line Items]  
Senior preferred 1,000
Mar-24 [Member] | 6.033% [Member] | Mar-34 [Member] | Mar-35 [Member] | United States of America, Dollars  
Type of Issue [Line Items]  
Senior non-preferred 1,000
Mar-24 [Member] | 3.500% [Member] | Mar-31 [Member] | Euro Member Countries, Euro  
Type of Issue [Line Items]  
Senior (Tranche 1)- Green bond 1,000
Jun-24 [Member] | 3 month Euribor rate + 45 basis points [Member] | Jun-27 [Member] | Euro Member Countries, Euro  
Type of Issue [Line Items]  
Senior preferred 1,000
Jun-24 [Member] | 3.625% [Member] | Jun-30 [Member] | Euro Member Countries, Euro  
Type of Issue [Line Items]  
Senior preferred 750
Jun-24 [Member] | 6.875% [Member] | Dec-30 to Jun-31 [Member] | Perpetual [Member] | Euro Member Countries, Euro  
Type of Issue [Line Items]  
AT 1 (CoCo) 750
Aug-24 [Member] | 4.375% [Member] | May-31 to Aug-31 [Member] | Aug-36 [Member] | Euro Member Countries, Euro  
Type of Issue [Line Items]  
Tier 2 € 1,000