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Investment Income - Additional Information (Detail) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of investment income [line items]      
Interest income € 5,835 € 5,783 € 6,052
Fair value interest income 4,943 4,811 5,056
Financial assets impaired [member]      
Disclosure of investment income [line items]      
Interest income € 146 € 160 € 190