XML 95 R76.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Loans and leases and allowance for credit losses - Loan and Leases Considered Nonaccrual and Interest Income Recognized on Loans (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Certain Loans Acquired in Transfer Accounted for as Debt Securities Accretable Yield Movement Schedule [Line Items] |  |  |  |
Amortized Cost with Allowance | $ 1,163 | $ 986 | $ 997 |
Amortized Cost without Allowance | 527 | 1,180 | 1,442 |
Nonaccrual | 1,690 | 2,166 | 2,439 | $ 2,060
Amortized Cost | 1,690 | 2,166 | 2,439 | 2,060
Interest Income Recognized | 92 | 78 | 77 |
Commercial Portfolio Segment |  |  |  |
Certain Loans Acquired in Transfer Accounted for as Debt Securities Accretable Yield Movement Schedule [Line Items] |  |  |  |
Amortized Cost with Allowance | 516 | 397 | 212 |
Amortized Cost without Allowance | 180 | 273 | 292 |
Nonaccrual | 696 | 670 | 504 | 371
Amortized Cost | 696 | 670 | 504 | 371
Interest Income Recognized | 23 | 22 | 26 |
Commercial Real Estate | Commercial |  |  |  |
Certain Loans Acquired in Transfer Accounted for as Debt Securities Accretable Yield Movement Schedule [Line Items] |  |  |  |
Amortized Cost with Allowance | 328 | 288 | 366 |
Amortized Cost without Allowance | 140 | 581 | 874 |
Nonaccrual | 468 | 869 | 1,240 | 919
Amortized Cost | 468 | 869 | 1,240 | 919
Interest Income Recognized | 43 | 29 | 14 |
Commercial Real Estate | Residential builder and developer |  |  |  |
Certain Loans Acquired in Transfer Accounted for as Debt Securities Accretable Yield Movement Schedule [Line Items] |  |  |  |
Amortized Cost with Allowance | 2 | 3 | 1 |
Amortized Cost without Allowance | 0 | 0 | 0 |
Nonaccrual | 2 | 3 | 1 | 3
Amortized Cost | 2 | 3 | 1 | 3
Interest Income Recognized | 1 | 0 | 2 |
Commercial Real Estate | Other commercial construction |  |  |  |
Certain Loans Acquired in Transfer Accounted for as Debt Securities Accretable Yield Movement Schedule [Line Items] |  |  |  |
Amortized Cost with Allowance | 60 | 71 | 59 |
Amortized Cost without Allowance | 6 | 100 | 66 |
Nonaccrual | 66 | 171 | 125 | 111
Amortized Cost | 66 | 171 | 125 | 111
Interest Income Recognized | 4 | 2 | 4 |
Residential Real Estate | Residential |  |  |  |
Certain Loans Acquired in Transfer Accounted for as Debt Securities Accretable Yield Movement Schedule [Line Items] |  |  |  |
Amortized Cost with Allowance | 137 | 100 | 195 |
Amortized Cost without Allowance | 142 | 170 | 155 |
Nonaccrual | 279 | 270 | 350 | 479
Amortized Cost | 279 | 270 | 350 | 479
Interest Income Recognized | 15 | 17 | 26 |
Consumer: | Home equity lines and loans |  |  |  |
Certain Loans Acquired in Transfer Accounted for as Debt Securities Accretable Yield Movement Schedule [Line Items] |  |  |  |
Amortized Cost with Allowance | 36 | 42 | 43 |
Amortized Cost without Allowance | 45 | 39 | 42 |
Nonaccrual | 81 | 81 | 85 | 70
Amortized Cost | 81 | 81 | 85 | 70
Interest Income Recognized | 6 | 7 | 4 |
Consumer: | Recreational finance |  |  |  |
Certain Loans Acquired in Transfer Accounted for as Debt Securities Accretable Yield Movement Schedule [Line Items] |  |  |  |
Amortized Cost with Allowance | 21 | 24 | 37 |
Amortized Cost without Allowance | 10 | 12 | 8 |
Nonaccrual | 31 | 36 | 45 | 28
Amortized Cost | 31 | 36 | 45 | 28
Interest Income Recognized | 0 | 1 | 1 |
Consumer: | Automobile |  |  |  |
Certain Loans Acquired in Transfer Accounted for as Debt Securities Accretable Yield Movement Schedule [Line Items] |  |  |  |
Amortized Cost with Allowance | 9 | 9 | 35 |
Amortized Cost without Allowance | 3 | 5 | 5 |
Nonaccrual | 12 | 14 | 40 | 34
Amortized Cost | 12 | 14 | 40 | 34
Interest Income Recognized | 0 | 0 | 0 |
Consumer: | Other |  |  |  |
Certain Loans Acquired in Transfer Accounted for as Debt Securities Accretable Yield Movement Schedule [Line Items] |  |  |  |
Amortized Cost with Allowance | 54 | 52 | 49 |
Amortized Cost without Allowance | 1 | 0 | 0 |
Nonaccrual | 55 | 52 | 49 | 45
Amortized Cost | 55 | 52 | 49 | $ 45
Interest Income Recognized | $ 0 | $ 0 | $ 0 |

X
- Definition Financing Receivable, Excluding Accrued Interest, Nonaccrual, With Allowance + References No definition available. + Details
Name: | mtb_FinancingReceivableExcludingAccruedInterestNonaccrualWithAllowance
Namespace Prefix: | mtb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Impaired Financing Receivable Nonaccrual Interest Income + References No definition available. + Details
Name: | mtb_ImpairedFinancingReceivableNonaccrualInterestIncome
Namespace Prefix: | mtb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAccretableYieldMovementScheduleLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest, of financing receivable on nonaccrual status. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 16 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-16 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrual
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest, of financing receivable on nonaccrual status with no allowance for credit loss. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 16 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-16 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrualNoAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mtb_CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mtb_ResidentialBuilderAndDeveloperMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mtb_OtherCommercialConstructionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mtb_ResidentialRealEstateExcludingAltAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mtb_HomeEquityLinesAndLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mtb_RecreationalFinanceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_AutomobileLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConsumerOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |