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Companies and businesses acquired and divested - Additional Information (Detail)
€ in Millions, ¥ in Millions, £ in Millions
1 Months Ended
Feb. 28, 2021
EUR (€)
Feb. 28, 2021
GBP (£)
Nov. 29, 2020
EUR (€)
Jan. 29, 2020
EUR (€)
Jan. 29, 2020
JPY (¥)
Jan. 08, 2019
EUR (€)
Jul. 30, 2018
EUR (€)
Jul. 30, 2020
EUR (€)
Disposal of major subsidiary [member]                
Disclosure of detailed information about business combination [Line Items]                
Business sold, business combination | £   £ 10            
Disposal of major subsidiary [member] | Stone Bridge [Member]                
Disclosure of detailed information about business combination [Line Items]                
Business sold, business combination € 65 £ 60            
CZ [member]                
Disclosure of detailed information about business combination [Line Items]                
Business disposal gain (loss)           € 70    
Business sold, business combination           155    
Underlying earnings before tax from cobined operations           € 17    
Japan [member] | Disposal of major subsidiary [member]                
Disclosure of detailed information about business combination [Line Items]                
Business disposal gain (loss)       € 53        
Business sold, business combination       € 153 ¥ 18,750      
Sale of interest percentage       50.00% 50.00%      
Hungary Poland Romania And Turkey [Member] | Vienna Insurance Group AG Winer Versicherung Gruppe [Member]                
Disclosure of detailed information about business combination [Line Items]                
Business sold, business combination     € 830          
Banco Santander [member]                
Disclosure of detailed information about business combination [Line Items]                
Upfront consideration paid             € 215 € 187
Additional upfront consideration payable             € 75  
Percentage acquired               51.00%
Additional upfront consideration payment due year             2024  
Vienna Insurance Group AG Wiener Versicherung Gruppe [Member]                
Disclosure of detailed information about business combination [Line Items]                
Gain loss on disposal of Investment     € 266          
Increase In Group Solvency Ratio Percentage     8.00%          
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, recognised in other comprehensive income, after tax, entity's own equity instruments     € 470          
Gains (losses) on exchange differences on translation, net of tax     € 204