Gains and losses on derecognition of financial assets measured at amortized cost (Detail) - EUR (€) € in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Gain and Losses on derecognition of Financial Assets at Amortized Cost [Abstract]
Gains	€ 7	€ 2	€ 9	€ 5
Losses	(4)	(1)	(6)	(2)
Net gains (losses) from derecognition of assets measured at amortized cost	€ 3	€ 1	€ 4	€ 4

Gain and Losses on derecognition of Financial Assets at Amortized Cost

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
-Note Expiry date 2027-01-01
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-IssueDate 2025-01-01
-Paragraph 82
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-URIDate 2025-03-27

+ Details

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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
-Name IFRS
-Number 7
-IssueDate 2025-01-01
-Paragraph 20A
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-URIDate 2025-03-27

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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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