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v3.25.3

Business segments - Narrative (Details) | 9 Months Ended
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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