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Impairment Charges / (Reversals) - Summary of Impairment Charges on Financial Assets, Excluding Receivables (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 on financial assets, excludes receivables € 133 € 71 € 70
Debt securities and money market instruments [member]      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Impairment charges on financial assets, excludes receivables 50 30 17
Loans [member]      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Impairment charges on financial assets, excludes receivables 76 35 50
Shares [member]      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Impairment charges on financial assets, excludes receivables € 7 € 5 € 2