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Investment Income - Summary of Investment Income From Financial Assets (Detail) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of detailed information about investment income [line items] |  |  |
Investment income | € 7,531 | € 7,035 | € 7,338
Investment income related to general account [member] |  |  |
Disclosure of detailed information about investment income [line items] |  |  |
Investment income | 5,291 | 5,268 | 5,394
Investment income related to general account [member] | Derivatives [member] |  |  |
Disclosure of detailed information about investment income [line items] |  |  |
Investment income | 39 | 72 | 31
Investment income related to general account [member] | Available-for-sale financial assets [member] |  |  |
Disclosure of detailed information about investment income [line items] |  |  |
Investment income | 3,267 | 3,180 | 3,467
Investment income related to general account [member] | Loans [member] |  |  |
Disclosure of detailed information about investment income [line items] |  |  |
Investment income | 1,779 | 1,704 | 1,686
Investment income related to general account [member] | Financial assets at fair value through profit or loss [member] |  |  |
Disclosure of detailed information about investment income [line items] |  |  |
Investment income | 125 | 212 | 148
Shares [member] |  |  |
Disclosure of detailed information about investment income [line items] |  |  |
Investment income | 1,571 | 1,124 | 1,164
Debt securities [member] |  |  |
Disclosure of detailed information about investment income [line items] |  |  |
Investment income | 3,959 | 3,899 | 4,248
Loans [member] |  |  |
Disclosure of detailed information about investment income [line items] |  |  |
Investment income | 1,779 | 1,704 | 1,686
Real estate [member] |  |  |
Disclosure of detailed information about investment income [line items] |  |  |
Investment income | 125 | 129 | 121
Real estate [member] | Investment income related to general account [member] |  |  |
Disclosure of detailed information about investment income [line items] |  |  |
Investment income | 83 | 82 | 71
Other [member] |  |  |
Disclosure of detailed information about investment income [line items] |  |  |
Investment income | 97 | 181 | 119
Other [member] | Investment income related to general account [member] |  |  |
Disclosure of detailed information about investment income [line items] |  |  |
Investment income | € (2) | € 18 | € (10)

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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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