v3.26.1
Companies and businesses acquired and divested - Additional Information (Detail)
€ in Millions
Jul. 21, 2023
Jun. 01, 2023
EUR (€)
Feb. 29, 2024
EUR (€)
Jul. 04, 2023
EUR (€)
Apr. 04, 2023
Royal London [Member]          
Disclosure of detailed information about business combination [Line Items]          
Number of sale of high-net worth individual customers         400,000
Poland and romania [member] | Vienna Insurance Group AG Wiener Versicherung Gruppe [Member]          
Disclosure of detailed information about business combination [Line Items]          
Business sold, business combination   € 125      
INDIA | Bandhan Financial Holdings Limited [Member] | Aegon Life Insurance Co. ltd [member]          
Disclosure of detailed information about business combination [Line Items]          
Percentage of sale of stake in associate 56.00%        
Netherlands [member] | ASR [Member] | Strategic Sale [Member] | Discontinued operations [member]          
Disclosure of detailed information about business combination [Line Items]          
Gross cash receivable       € 2,200  
Netherlands [member] | Vereniging Aegon [member] | ASR [Member] | Strategic Sale [Member]          
Disclosure of detailed information about business combination [Line Items]          
Percentage of voting equity interests acquired       30.00%  
Vienna Insurance Group AG Wiener Versicherung Gruppe [Member]          
Disclosure of detailed information about business combination [Line Items]          
Gain (loss) on disposal of Investment   € (78)      
Nationwide Building Society [Member]          
Disclosure of detailed information about business combination [Line Items]          
Total consideration transferred     € 41    
Goodwill recognised as of acquisition date     23    
Identifiable intangible assets recognised as of acquisition date     40    
DeferredConsiderationAtAcquisitionDate     € 11