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Commitments and Contingencies - Summary of Commitments through Purchase and Sale Transactions of Investments (Detail) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Real estate [member] |  |
Disclosure of purchase and sale transactions of investments [line items] |  |
Purchase | € 168 | € 156
Sale | 3 | 66
Mortgage loans [member] |  |
Disclosure of purchase and sale transactions of investments [line items] |  |
Purchase | 859 | 3,187
Sale | 79 | 67
Private loans [member] |  |
Disclosure of purchase and sale transactions of investments [line items] |  |
Purchase | 394 | 1,224
Other [member] |  |
Disclosure of purchase and sale transactions of investments [line items] |  |
Purchase | € 1,824 | € 2,222

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- Definition The cash inflow from sales of investments accounted for using the equity method. [Refer: Investments accounted for using equity method] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2019-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_16&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The cash outflow for the purchase of interests in investments accounted for using the equity method. [Refer: Investments accounted for using equity method] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2019-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_16&doctype=Standard -URIDate 2019-03-27 + Details
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