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Investment Income - Summary of Investment Income (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
Dividend income | 1,571 | 1,124 | 1,164
Rental income | 125 | 129 | 121
Investment income | 7,531 | 7,035 | 7,338
Aegon N.V [member] |  |  |
Disclosure of investment income [line items] |  |  |
Interest income from intercompany loans | 51 | 66 |
Interest income from derivatives | (4) | 11 |
Investment income | 47 | 77 |
Investment income related to general account [member] |  |  |
Disclosure of investment income [line items] |  |  |
Investment income | 5,291 | 5,268 | 5,394
Investment contracts for account of policyholders [member] |  |  |
Disclosure of investment income [line items] |  |  |
Investment income | € 2,240 | € 1,767 | € 1,944

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- Definition The amount of investment income, such as interest and dividends. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 26 -IssueDate 2019-01-01 -Paragraph 35 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=26&code=ifrs-tx-2019-en-r&anchor=para_35_b_iii&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_85&doctype=Standard -URIDate 2019-03-27 + Details
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