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Investment Income - Additional Information (Detail) - EUR (€) € in Millions | 12 Months Ended
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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

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