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Segment information
 9 Months Ended
Sep. 30, 2025
Segment Reporting [Abstract]  
Segment information
15. 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 2024 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 reportable segments follows:
Three Months Ended September 30,
Commercial Bank Retail Bank Institutional Services and Wealth ManagementAll Other Total (c)
(Dollars in millions)2025202420252024202520242025202420252024
Net interest income (a)$539 $551 $999 $1,087 $163 $185 $60 $(97)$1,761 $1,726 
Noninterest income209 172 249 205 244 204 50 25 752 606 
Total revenue748 723 1,248 1,292 407 389 110 (72)2,513 2,332 
Provision for credit losses72 39 70 74 — 3 (17)4 125 120 
Salaries and employee benefits160 152 204 196 112 103 357 324 833 775 
Depreciation and amortization11 10 59 61 2 1 50 50 122 122 
Other direct expenses68 69 116 105 25 24 199 208 408 406 
Indirect expense (b)127 127 297 255 78 74 (502)(456)— — 
Income (loss) before taxes310 326 502 601 190 184 23 (202)1,025 909 
Income tax expense (benefit)82 87 126 155 48 47 (23)(101)233 188 
Net income (loss)$228 $239 $376 $446 $142 $137 $46 $(101)$792 $721 
Average total assets$78,227 $80,434 $57,653 $53,128 $4,355 $3,898 $70,818 $72,121 $211,053 $209,581 
Nine Months Ended September 30,
Commercial Bank Retail Bank Institutional Services and Wealth ManagementAll Other Total (c)
(Dollars in millions)2025202420252024202520242025202420252024
Net interest income (a)$1,599 $1,652 $2,959 $3,248 $500 $565 $111 $(341)$5,169 $5,124 
Noninterest income587 487 691 606 678 602 90 75 2,046 1,770 
Total revenue2,186 2,139 3,650 3,854 1,178 1,167 201 (266)7,215 6,894 
Provision for credit losses168 193 220 202 5 6 (13)69 380 470 
Salaries and employee benefits461 452 601 577 325 306 1,146 1,037 2,533 2,372 
Depreciation and amortization32 29 181 189 6 6 157 155 376 379 
Other direct expenses208 203 310 298 77 75 610 669 1,205 1,245 
Indirect expense (b)379 378 868 751 241 223 (1,488)(1,352)— — 
Income (loss) before taxes938 884 1,470 1,837 524 551 (211)(844)2,721 2,428 
Income tax expense (benefit)248 239 372 473 133 142 (124)(333)629 521 
Net income (loss)$690 $645 $1,098 $1,364 $391 $409 $(87)$(511)$2,092 $1,907 
Average total assets$78,691 $80,903 $56,022 $52,771 $4,244 $3,735 $70,932 $73,599 $209,889 $211,008 
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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 and 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 $12 million and $13 million for the three-month periods ended September 30, 2025 and 2024, respectively, and $33 million and $38 million for the nine-month periods ended September 30, 2025 and 2024, respectively, and is eliminated in "All Other" total revenues.
(b)Indirect expense represents centrally-allocated costs associated with data processing, risk management and other support services provided by the "All Other" category to the Commercial Bank, Retail Bank and Institutional Services and Wealth Management segments.
(c)Intersegment revenues and expenses were not material for the three-month and nine-month periods ended September 30, 2025 and 2024.