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Financial Risks - Summary of Realized Gains and (Losses) on Debt Securities (Detail) - EUR (€) € in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure Of Credit Quality Of Debt Securities [abstract] |  |
Gross realized gains | € 405 | € 156
Gross realized losses | € (66) | € (378)

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