XML 43 R35.htm IDEA: XBRL DOCUMENT
v3.24.1.u1

Variable interest entities and asset securitizations (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2024
Variable Interest Entity Disclosure [Abstract] |
Schedule of Carrying Amount of Investments In Tax Equity Partnerships and Related Future Funding Commitments | Information on the Company’s carrying amount of its investments in tax equity partnerships and its related future funding commitments are presented in the following table:
(Dollars in millions) |  | March 31, 2024 |  |  | December 31, 2023 |
Affordable housing projects: |  |  |  |  |  |
Carrying amount (a) |  | $ | 1,323 |  |  | $ | 1,340 |
Amount of future funding commitments included in carrying amount (b) |  |  | 379 |  |  |  | 410 |
Contingent commitments |  |  | 55 |  |  |  | 55 |
Renewable energy: |  |  |  |  |  |
Carrying amount (a) |  |  | 79 |  |  |  | 80 |
Amount of future funding commitments included in carrying amount (b) |  |  | 49 |  |  |  | 31 |
Other: |  |  |  |  |  |
Carrying amount (a) |  |  | 40 |  |  |  | 41 |
Amount of future funding commitments included in carrying amount (b) |  |  | — |  |  |  | — |
(a) Included in "accrued interest and other assets" in the Consolidated Balance Sheet. (b) Included in "accrued interest and other liabilities" in the Consolidated Balance Sheet.

X
- Definition Schedule of carrying amount of investments in tax equity partnerships. + References No definition available. + Details
Name: | mtb_ScheduleOfCarryingAmountOfInvestmentsInTaxEquityPartnershipsTableTextBlock
Namespace Prefix: | mtb_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Variable interest entity disclosure. + References No definition available. + Details
Name: | mtb_VariableInterestEntityDisclosureAbstract
Namespace Prefix: | mtb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration