Gains and Losses on derecognition of Financial Assets measured at Amortized Cost (Detail) - EUR (€) € in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Gain and Losses on derecognition of Financial Assets at Amortized Cost [Abstract]
Gains	€ 174	€ 0	€ 235	€ 0
Losses	(3)	0	(3)	0
Net gains (losses) from derecognition of securities measured at amortized cost	€ 171	€ 0	€ 232	€ 0

No definition available.

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- Definition

The gain (loss) arising from the derecognition of financial assets measured at amortised cost. [Refer: Financial assets at amortised cost]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The gain, recognised in the statement of comprehensive income, that arises from the derecognition of financial assets measured at amortised cost. [Refer: Financial assets at amortised cost]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The loss recognised in the statement of comprehensive income arising from the derecognition of financial assets measured at amortised cost. [Refer: Financial assets at amortised cost]

+ References

+ Details

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