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Business segments - Narrative (Details)	9 Months Ended
	Sep. 30, 2025 business
Segment Reporting [Abstract]
Number of principal businesses (business)	3

X

- Definition

Number of Principal Businesses

+ References

No definition available.

+ Details

Name:	bk_NumberOfPrincipalBusinesses
Namespace Prefix:	bk_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_SegmentReportingAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration