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Segment Information - Additional Information (Details)	3 Months Ended
	Mar. 31, 2024 USD ($)
Segment Reporting [Abstract]
Taxable-equivalent adjustment	$ 12,000,000

X

- Definition

Taxable equivalent adjustment.

+ References

No definition available.

+ Details

Name:	mtb_TaxableEquivalentAdjustment
Namespace Prefix:	mtb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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