Transfers of Financial Assets - Summary of Securities Lending (Detail) - Securities lending [member] - EUR (€) € in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure of financial assets [line items]
Carrying amount of transferred financial assets	€ 3,718	€ 4,987
Fair value of cash collateral received	2,480	3,277
Fair value of non-cash collateral received	1,356	1,847
Net exposure	(117)	(138)
Non-cash collateral that can be sold or repledged in the absence of default	1,171	1,550
Non-cash collateral that has been sold or transferred	€ 0	€ 0

Carrying amount of transferred assets.

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- Definition

Financial instruments sold or re pledged as collateral at fair value.

+ References

No definition available.

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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
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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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- 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
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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