XML 62 R51.htm IDEA: XBRL DOCUMENT
v3.25.2

Loans and allowance for loan losses - Loan and Leases Considered Nonaccrual and Interest Income Recognized on Loans (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Mar. 31, 2025 | Jan. 01, 2025 | Dec. 31, 2024 | Mar. 31, 2024 | Jan. 01, 2024
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |  |  |
Amortized Cost with Allowance | $ 1,152 | $ 1,056 | $ 1,152 | $ 1,056 |  |  |  |  |
Amortized Cost without Allowance | 421 | 968 | 421 | 968 |  |  |  |  |
Total | 1,573 | 2,024 | 1,573 | 2,024 | $ 1,540 | $ 1,690 | $ 1,690 | $ 2,302 | $ 2,166
Amortized Cost | 1,573 | 2,024 | 1,573 | 2,024 | 1,540 | 1,690 | 1,690 | 2,302 | 2,166
Interest Income Recognized | 22 | 34 | 40 | 47 |  |  |  |  |
Commercial and industrial |  |  |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |  |  |
Amortized Cost with Allowance | 663 | 494 | 663 | 494 |  |  |  |  |
Amortized Cost without Allowance | 124 | 311 | 124 | 311 |  |  |  |  |
Total | 787 | 805 | 787 | 805 | 662 | 696 | 696 | 864 | 670
Amortized Cost | 787 | 805 | 787 | 805 | 662 | 696 | 696 | 864 | 670
Interest Income Recognized | 6 | 7 | 12 | 9 |  |  |  |  |
Commercial Real Estate | Commercial |  |  |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |  |  |
Amortized Cost with Allowance | 289 | 315 | 289 | 315 |  |  |  |  |
Amortized Cost without Allowance | 87 | 392 | 87 | 392 |  |  |  |  |
Total | 376 | 707 | 376 | 707 | 394 | 468 | 468 | 855 | 869
Amortized Cost | 376 | 707 | 376 | 707 | 394 | 468 | 468 | 855 | 869
Interest Income Recognized | 10 | 20 | 17 | 26 |  |  |  |  |
Commercial Real Estate | Residential builder and developer |  |  |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |  |  |
Amortized Cost with Allowance | 1 | 2 | 1 | 2 |  |  |  |  |
Amortized Cost without Allowance | 0 | 0 | 0 | 0 |  |  |  |  |
Total | 1 | 2 | 1 | 2 | 1 | 2 | 2 | 3 | 3
Amortized Cost | 1 | 2 | 1 | 2 | 1 | 2 | 2 | 3 | 3
Interest Income Recognized | 0 | 0 | 0 | 0 |  |  |  |  |
Commercial Real Estate | Other commercial construction |  |  |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |  |  |
Amortized Cost with Allowance | 23 | 13 | 23 | 13 |  |  |  |  |
Amortized Cost without Allowance | 0 | 64 | 0 | 64 |  |  |  |  |
Total | 23 | 77 | 23 | 77 | 28 | 66 | 66 | 141 | 171
Amortized Cost | 23 | 77 | 23 | 77 | 28 | 66 | 66 | 141 | 171
Interest Income Recognized | 0 | 3 | 0 | 3 |  |  |  |  |
Residential Real Estate | Residential |  |  |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |  |  |
Amortized Cost with Allowance | 115 | 115 | 115 | 115 |  |  |  |  |
Amortized Cost without Allowance | 150 | 145 | 150 | 145 |  |  |  |  |
Total | 265 | 260 | 265 | 260 | 284 | 279 | 279 | 255 | 270
Amortized Cost | 265 | 260 | 265 | 260 | 284 | 279 | 279 | 255 | 270
Interest Income Recognized | 4 | 3 | 7 | 7 |  |  |  |  |
Consumer | Home equity lines and loans |  |  |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |  |  |
Amortized Cost with Allowance | 34 | 37 | 34 | 37 |  |  |  |  |
Amortized Cost without Allowance | 41 | 42 | 41 | 42 |  |  |  |  |
Total | 75 | 79 | 75 | 79 | 78 | 81 | 81 | 87 | 81
Amortized Cost | 75 | 79 | 75 | 79 | 78 | 81 | 81 | 87 | 81
Interest Income Recognized | 2 | 1 | 4 | 2 |  |  |  |  |
Consumer | Recreational finance |  |  |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |  |  |
Amortized Cost with Allowance | 15 | 15 | 15 | 15 |  |  |  |  |
Amortized Cost without Allowance | 10 | 10 | 10 | 10 |  |  |  |  |
Total | 25 | 25 | 25 | 25 | 26 | 31 | 31 | 30 | 36
Amortized Cost | 25 | 25 | 25 | 25 | 26 | 31 | 31 | 30 | 36
Interest Income Recognized | 0 | 0 | 0 | 0 |  |  |  |  |
Consumer | Automobile |  |  |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |  |  |
Amortized Cost with Allowance | 7 | 7 | 7 | 7 |  |  |  |  |
Amortized Cost without Allowance | 2 | 4 | 2 | 4 |  |  |  |  |
Total | 9 | 11 | 9 | 11 | 11 | 12 | 12 | 13 | 14
Amortized Cost | 9 | 11 | 9 | 11 | 11 | 12 | 12 | 13 | 14
Interest Income Recognized | 0 | 0 | 0 | 0 |  |  |  |  |
Consumer | Other |  |  |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |  |  |
Amortized Cost with Allowance | 5 | 58 | 5 | 58 |  |  |  |  |
Amortized Cost without Allowance | 7 | 0 | 7 | 0 |  |  |  |  |
Total | 12 | 58 | 12 | 58 | 56 | 55 | 55 | 54 | 52
Amortized Cost | 12 | 58 | 12 | 58 | $ 56 | $ 55 | $ 55 | $ 54 | $ 52
Interest Income Recognized | $ 0 | $ 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 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
- 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_FinancingReceivableImpairedLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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: |