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Segment information
 3 Months Ended
Mar. 31, 2026
Segment Reporting [Abstract]  
Segment information
14. Segment information
Reportable segments have been determined based upon the Company’s organizational structure which is primarily arranged around the delivery of products and services to similar customer types. The Company's internal profitability reporting system produces financial information, inclusive of net interest income and income before taxes, for each segment. Such information is reviewed by the Company's Chief Executive Officer, who has been identified as the chief operating decision maker, in evaluating operating decisions, business performance and the allocation of resources. The Company's reportable segments are Commercial Bank, Retail Bank and Institutional Services and Wealth Management.
The financial information of the Company's segments was compiled utilizing the accounting policies described in note 21 of Notes to Financial Statements in M&T's 2025 Annual Report. The management accounting policies and processes utilized in compiling segment financial information are highly subjective and, unlike financial accounting, are not based on authoritative guidance similar to GAAP. As a result, reported segment results are not necessarily comparable with similar information reported by other financial institutions. Furthermore, changes in management structure or allocation methodologies and procedures may result in changes in reported segment financial data.
Information about the Company's segments is presented in the accompanying table.
Three Months Ended March 31,
Commercial Bank Retail Bank Institutional Services and Wealth ManagementAll Other Total
(Dollars in millions)2026202520262025202620252026202520262025
Net interest income (a)$535 $529 $950 $972 $156 $171 $111 $23 $1,752 $1,695 
Noninterest income193 173 217 208 221 209 58 21 689 611 
Total revenue728 702 1,167 1,180 377 380 169 44 2,441 2,306 
Provision for credit losses29 36 82 79 — 3 29 12 140 130 
Salaries and employee benefits145 151 197 196 109 106 463 434 914 887 
Depreciation and amortization10 10 36 62 2 2 49 56 97 130 
Other direct expenses78 67 103 99 35 26 211 206 427 398 
Indirect expense (b)127 123 289 279 80 81 (496)(483)— — 
Income (loss) before taxes339 315 460 465 151 162 (87)(181)863 761 
Income tax expense (benefit)89 84 116 118 39 41 (45)(66)199 177 
Net income (loss)$250 $231 $344 $347 $112 $121 $(42)$(115)$664 $584 
Average total assets$78,804 $79,362 $58,821 $54,381 $4,744 $4,102 $71,459 $70,476 $213,828 $208,321 
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(a)Net interest income is the difference between actual taxable-equivalent interest earned on assets and interest paid on liabilities by a segment and a funding charge (credit) based on the Company's internal funds transfer pricing methodology. Segments are charged a cost to fund any assets (e.g. loans) and are paid a funding credit for any funds provided (e.g. deposits). The taxable-equivalent adjustment aggregated to $11 million and $12 million for the three-month periods ended March 31, 2026 and 2025, respectively, and is eliminated in "All Other" total revenues.
(b)Indirect expense represents centrally-allocated costs associated with certain technology, operations, risk management, finance and human resources expenses provided by the "All Other" category to the Commercial Bank, Retail Bank and Institutional Services and Wealth Management segments.