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Impairment Charges / (Reversals) - Summary of Impairment Reversals on Financial Assets, Excluding Receivables (Detail) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Impairment reversals on financial assets, excludes receivables | € (73) | € (39) | € (32)
Debt securities and money market instruments [member] |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Impairment reversals on financial assets, excludes receivables | (67) | (34) | (17)
Loans [member] |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Impairment reversals on financial assets, excludes receivables | (5) | (3) | (13)
Other [member] |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Impairment reversals on financial assets, excludes receivables | € (1) | € (2) | € (2)

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- Definition Impairment reversals on financial assets excludes receivables. + References No definition available. + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Details
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