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Commitments and Contingencies - Commitments and Contingent Liabilities Outstanding (Detail) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
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Commitments to extend credit |  |
Commercial and industrial | $ 28,439 | $ 28,566
Commercial real estate loans to be sold | 451 | 916
Other commercial real estate | 4,413 | 5,019
Residential real estate loans to be sold | 211 | 163
Other residential real estate | 393 | 331
Home equity lines of credit | 8,080 | 8,109
Credit cards | 5,651 | 5,578
Other | 389 | 413
Standby letters of credit | 2,230 | 2,289
Commercial letters of credit | 56 | 62
Financial guarantees and indemnification contracts | 4,129 | 4,036
Commitments to sell real estate loans | $ 1,329 | $ 1,400

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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 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

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

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- 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