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Basis of preparation and significant accounting policies - Additional information (Details)
€ in Millions
 12 Months Ended
Dec. 31, 2023
EUR (€)
country
segment
Dec. 31, 2022
EUR (€)
Dec. 31, 2021
EUR (€)
Dec. 31, 2020
EUR (€)
Disclosure of significant accounting policies [line items]        
Reconciliation net result effect of adjustment after tax EU IAS 39 carve-out € (3,147) € 8,451 € 1,174  
Total equity € 55,628 € 57,004 52,802 € 52,640
Number of reportable segments | segment 5      
Level of price index 1,859.38 1,128.45    
Price index movements 0.6477 0.6427    
Minimum        
Disclosure of significant accounting policies [line items]        
Number of countries in which entity operates | country 40      
Maximum | Software        
Disclosure of significant accounting policies [line items]        
Useful life, intangible assets 5 years      
Property | Minimum        
Disclosure of significant accounting policies [line items]        
Useful life, property and equipment 20 years      
Property | Maximum        
Disclosure of significant accounting policies [line items]        
Useful life, property and equipment 50 years      
- Data processing equipment | Minimum        
Disclosure of significant accounting policies [line items]        
Useful life, property and equipment 2 years      
- Data processing equipment | Maximum        
Disclosure of significant accounting policies [line items]        
Useful life, property and equipment 5 years      
Fixtures and fittings | Minimum        
Disclosure of significant accounting policies [line items]        
Useful life, property and equipment 4 years      
Fixtures and fittings | Maximum        
Disclosure of significant accounting policies [line items]        
Useful life, property and equipment 10 years      
Financial assets at amortised cost | Financial assets outside scope of IFRS 7, class        
Disclosure of significant accounting policies [line items]        
Financial assets € 538 € 743    
Adjustment        
Disclosure of significant accounting policies [line items]        
Total equity   (46) [1] € 64  
Adjustment | Financial assets at amortised cost | Financial assets outside scope of IFRS 7, class        
Disclosure of significant accounting policies [line items]        
Total equity   (13)    
Adjustment | Increase (decrease) due to changes in accounting policy        
Disclosure of significant accounting policies [line items]        
Total equity   € (33)    
[1] Changes in policy following the adoption of IFRS 17 and change in policy for non-financial guarantees.