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Commitments and Contingencies - Commitments and Contingent Liabilities Outstanding (Detail) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Commitments to extend credit |  |
Commercial and industrial | $ 33,065 | $ 31,521
Commercial real estate loans to be sold | 784 | 479
Other commercial real estate | 2,345 | 2,697
Residential real estate loans to be sold | 224 | 190
Other residential real estate | 648 | 517
Home equity lines of credit | 7,933 | 7,933
Credit cards | 6,243 | 6,087
Other | 287 | 244
Standby letters of credit | 2,254 | 2,260
Commercial letters of credit | 53 | 58
Financial guarantees and indemnification contracts | 4,429 | 4,335
Commitments to sell real estate loans | $ 1,313 | $ 1,142

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- Definition Commitments regarding commercial letters of credit. + References No definition available. + Details
Name: | mtb_CommitmentsRegardingCommercialLettersOfCredit
Namespace Prefix: | mtb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Commitments regarding financial guarantees and indemnification contracts. + References No definition available. + Details
Name: | mtb_CommitmentsRegardingFinancialGuaranteesAndIndemnificationContracts
Namespace Prefix: | mtb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Commitments to extend credit. + References No definition available. + Details
Name: | mtb_CommitmentsToExtendCreditAbstract
Namespace Prefix: | mtb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Commitments To Extend Credit For Commercial And Industrial + References No definition available. + Details
Name: | mtb_CommitmentsToExtendCreditForCommercialAndIndustrial
Namespace Prefix: | mtb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Commitments to extend credit for commercial and other. + References No definition available. + Details
Name: | mtb_CommitmentsToExtendCreditForCommercialAndOther
Namespace Prefix: | mtb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Commitments to extend credit for commercial real estate loans to be sold. + References No definition available. + Details
Name: | mtb_CommitmentsToExtendCreditForCommercialRealEstateLoansToBeSold
Namespace Prefix: | mtb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Commitments To Extend Credit For Credit Cards + References No definition available. + Details
Name: | mtb_CommitmentsToExtendCreditForCreditCards
Namespace Prefix: | mtb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Commitments to extend credit for home equity lines of credit. + References No definition available. + Details
Name: | mtb_CommitmentsToExtendCreditForHomeEquityLinesOfCredit
Namespace Prefix: | mtb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Commitments to extend credit for other commercial real estate. + References No definition available. + Details
Name: | mtb_CommitmentsToExtendCreditForOtherCommercialRealEstate
Namespace Prefix: | mtb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Commitments to extend credit for other residential real estate. + References No definition available. + Details
Name: | mtb_CommitmentsToExtendCreditForOtherResidentialRealEstate
Namespace Prefix: | mtb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Commitments to extend credit for residential real estate loans to be sold. + References No definition available. + Details
Name: | mtb_CommitmentsToExtendCreditForResidentialRealEstateLoansToBeSold
Namespace Prefix: | mtb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Commitments to sell real estate loans notional amount. + References No definition available. + Details
Name: | mtb_CommitmentsToSellRealEstateLoansNotionalAmount
Namespace Prefix: | mtb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant