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Commissions and Expenses - Additional Information (Detail) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure Of Commissions And Expenses [abstract] |  |  |
Depreciation expense included in administration expenses | € 87 | € 80 | € 105
Minimum lease payments recognized as expense | 0 |  |
Amount included in employee expenses relating to defined contributions | € 43 | € 44 | € 46
Vesting period | 2 years |  |

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- Definition Defined contributions included in employee expenses. + References No definition available. + Details
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- Definition Disclosure of commissions and expenses. + References No definition available. + Details
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- Definition Long term incentive plan vesting period. + References No definition available. + Details
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Balance Type: | na
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- Definition Minimum lease payments recognized as expense. + References No definition available. + Details
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- Definition The amount of depreciation expense. Depreciation is the systematic allocation of depreciable amounts of tangible assets over their useful lives. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard -URIDate 2019-03-27 + Details
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