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Condensed financial information of the parent company - Five-year schedule of maturities of debt (Details) - Parent company - EUR (€)
€ in Millions
Dec. 31, 2024
Dec. 31, 2023
Subordinated Loans    
Condensed Financial Statements, Captions [Line Items]    
Borrowings € 18,522 € 16,330
Subordinated Loans | Within 1 year    
Condensed Financial Statements, Captions [Line Items]    
Borrowings
Subordinated Loans | More than 1 year but less than 2 years    
Condensed Financial Statements, Captions [Line Items]    
Borrowings
Subordinated Loans | More than 2 years but less than 3 years    
Condensed Financial Statements, Captions [Line Items]    
Borrowings
Subordinated Loans | More than 3 years but less than 4 years    
Condensed Financial Statements, Captions [Line Items]    
Borrowings
Subordinated Loans | More than 4 years but less than 5 years    
Condensed Financial Statements, Captions [Line Items]    
Borrowings
Subordinated Loans | More than 5 years    
Condensed Financial Statements, Captions [Line Items]    
Borrowings 10,035 9,317
Subordinated Loans | Maturity not applicable    
Condensed Financial Statements, Captions [Line Items]    
Borrowings 8,487 7,014
Debenture loans    
Condensed Financial Statements, Captions [Line Items]    
Borrowings 49,751 42,569
Debenture loans | Within 1 year    
Condensed Financial Statements, Captions [Line Items]    
Borrowings 1,010 1,474
Debenture loans | More than 1 year but less than 2 years    
Condensed Financial Statements, Captions [Line Items]    
Borrowings 8,053 3,250
Debenture loans | More than 2 years but less than 3 years    
Condensed Financial Statements, Captions [Line Items]    
Borrowings 7,401 7,616
Debenture loans | More than 3 years but less than 4 years    
Condensed Financial Statements, Captions [Line Items]    
Borrowings 7,523 7,049
Debenture loans | More than 4 years but less than 5 years    
Condensed Financial Statements, Captions [Line Items]    
Borrowings 6,220 7,306
Debenture loans | More than 5 years    
Condensed Financial Statements, Captions [Line Items]    
Borrowings 19,544 15,875
Debenture loans | Maturity not applicable    
Condensed Financial Statements, Captions [Line Items]    
Borrowings