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v3.25.0.1

Borrowings - Long-term Borrowings (Detail) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Instrument [Line Items] |  |
Long-term borrowings | $ 12,605 | $ 8,201
M&T |  |
Debt Instrument [Line Items] |  |
Subordinated notes (fixed rate) | 0 | 76
Long-term borrowings | 5,143 | 3,098
M&T Bank |  |
Debt Instrument [Line Items] |  |
Other Long-Term Debt | 10 | 10
Long-term borrowings | 7,462 | 5,103
Senior Notes | M&T |  |
Debt Instrument [Line Items] |  |
Senior notes | $ 4,710 | 2,482
Senior Notes | M&T | Minimum |  |
Debt Instrument [Line Items] |  |
Interest rate of debt instrument | 4.55% |
Senior Notes | M&T | Maximum |  |
Debt Instrument [Line Items] |  |
Interest rate of debt instrument | 7.41% |
Senior Notes | M&T Bank |  |
Debt Instrument [Line Items] |  |
Senior notes | $ 3,745 | 3,741
Senior Notes | M&T Bank | Minimum |  |
Debt Instrument [Line Items] |  |
Interest rate of debt instrument | 2.90% |
Senior Notes | M&T Bank | Maximum |  |
Debt Instrument [Line Items] |  |
Interest rate of debt instrument | 5.40% |
Fixed Junior Subordinated Debentures | M&T |  |
Debt Instrument [Line Items] |  |
Interest rate of debt instrument | 10.60% |
Junior subordinated debentures | $ 7 | 55
Variable Rate Junior Subordinated Debentures | M&T |  |
Debt Instrument [Line Items] |  |
Junior subordinated debentures | $ 426 | 485
Variable Rate Junior Subordinated Debentures | M&T | Minimum |  |
Debt Instrument [Line Items] |  |
Interest rate of debt instrument | 5.70% |
Variable Rate Junior Subordinated Debentures | M&T | Maximum |  |
Debt Instrument [Line Items] |  |
Interest rate of debt instrument | 8.20% |
Subordinated Debt | M&T Bank |  |
Debt Instrument [Line Items] |  |
Interest rate of debt instrument | 3.40% |
Subordinated notes (fixed rate) | $ 474 | 873
FHLB Advances, Variable | M&T Bank |  |
Debt Instrument [Line Items] |  |
Interest rate of debt instrument | 4.74% |
Federal Home Loan Bank advances | $ 2,000 | 0
FHLB Advances, Fixed | M&T Bank |  |
Debt Instrument [Line Items] |  |
Federal Home Loan Bank advances | $ 4 | 5
FHLB Advances, Fixed | M&T Bank | Minimum |  |
Debt Instrument [Line Items] |  |
Interest rate of debt instrument | 0.00% |
FHLB Advances, Fixed | M&T Bank | Maximum |  |
Debt Instrument [Line Items] |  |
Interest rate of debt instrument | 5.98% |
Asset Backed Notes | M&T Bank |  |
Debt Instrument [Line Items] |  |
Asset-backed notes | $ 1,229 | $ 474
Asset Backed Notes | M&T Bank | Minimum |  |
Debt Instrument [Line Items] |  |
Interest rate of debt instrument | 4.86% |
Asset Backed Notes | M&T Bank | Maximum |  |
Debt Instrument [Line Items] |  |
Interest rate of debt instrument | 5.76% |
Other Debt | M&T Bank |  |
Debt Instrument [Line Items] |  |
Interest rate of debt instrument | 4.38% |

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