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Commitments and Contingencies - Summary of Commitments through Purchase and Sale Transactions of Investments (Detail) - EUR (€) € in Millions	12 Months Ended
	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

Disclosure Of Purchase And Sale Transactions Of Investments [line items]

+ References

No definition available.

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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
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-Number 7
-IssueDate 2019-01-01
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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

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