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Impairment Charges / (Reversals) - Additional Information (Detail) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of impairment loss and reversal of impairment loss [line items]      
Impairment charges and reversals on non-financial assets and receivables € 109 € 46 € 4
Impairment charges non financial assets value of business acquired and deferred policy acquisition costs 76    
Impairment loss (reversal of impairment loss) recognised in profit or loss   € 46  
Capital Injections [Member]      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Impairment loss on financial assets 10    
Software [member]      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Impairment of intangible assets other than goodwill € 9