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Transfers of Financial Assets - Summary of Reverse Repurchase Agreements (Detail) - Reverse repurchase agreements [member] - EUR (€) € in Millions	Dec. 31, 2019	Dec. 31, 2018
Disclosure of financial assets [line items]
Cash paid for reverse repurchase agreements	€ 4,980	€ 2,195
Fair value of non-cashcollateral received	5,003	2,224
Net exposure	(23)	(29)
Non-cash collateral that can be sold or repledged in the absence of default	4,640	1,740
Non-cash collateral that has been sold or transferred

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- Definition

Cash paid for reverse repurchase agreements.

+ References

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- Definition

Net exposure at fair value.

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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

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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

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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.

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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
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