Transfers of Financial Assets - Summary of Reverse Repurchase Agreements (Detail) - Reverse repurchase agreements [member] - EUR (€) € in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure of financial assets [line items]
Cash paid for reverse repurchase agreements	€ 2,195	€ 4,859
Fair value of non-cashcollateral received	2,224	4,885
Net exposure	(29)	(25)
Non-cash collateral that can be sold or repledged in the absence of default	1,740	4,166
Non-cash collateral that has been sold or transferred	€ 0	€ 0

Cash paid for reverse repurchase agreements.

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- Definition

Net exposure at fair value.

+ References

No definition available.

+ Details

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- Definition

The fair value of collateral held that is permitted to be sold or repledged in the absence of default by the owner of the collateral. [Refer: At fair value [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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-IssueDate 2018-01-01
-Paragraph 15
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_15_a&doctype=Standard
-URIDate 2018-03-16

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- Definition

The fair value of collateral sold or repledged that was permitted to be sold or repledged in the absence of default by the owner of the collateral. [Refer: At fair value [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2018-01-01
-Paragraph 15
-Subparagraph b
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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The amount of non-cash collateral assets (such as debt or equity instruments) provided to a transferee, for which the transferee has the right by contract or custom to sell or repledge the collateral.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 9
-IssueDate 2018-01-01
-Paragraph 3.2.23
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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