M&T Bank (MTB) 10-Q 3 May 24 2024 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2024	May 01, 2024
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2024
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1
Entity Registrant Name	M&T BANK CORPORATION
Entity Central Index Key	0000036270
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		166,854,421
Entity File Number	1-9861
Entity Tax Identification Number	16-0968385
Entity Incorporation, State or Country Code	NY
Entity Address, Address Line One	One M&T Plaza
Entity Address, Postal Zip Code	14203
Entity Address, City or Town	Buffalo
Entity Address, State or Province	NY
City Area Code	716
Local Phone Number	635-4000
Document Quarterly Report	true
Document Transition Report	false
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Shell Company	false
Common Stock [Member]
Document Information [Line Items]
Trading Symbol	MTB
Title of 12(b) Security	Common Stock, $0.50 par value
Security Exchange Name	NYSE
Series H Preferred Stock [Member]
Document Information [Line Items]
Trading Symbol	MTBPrH
Title of 12(b) Security	Perpetual Fixed-to-Floating RateNon-Cumulative Preferred Stock, Series H
Security Exchange Name	NYSE

Consolidated Balance Sheet (Una

Consolidated Balance Sheet (Unaudited) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Assets
Cash and due from banks	$ 1,695	$ 1,731
Interest-bearing deposits at banks	32,144	28,069
Trading account	99	106
Investment securities
Available for sale (cost: $12,396 at March 31, 2024; $10,691 at December 31, 2023)	12,134	10,440
Held to maturity (fair value: $13,865 at March 31, 2024; $14,308 at December 31, 2023)	15,078	15,330
Equity and other securities (cost: $1,279 at March 31, 2024; $1,125 at December 31, 2023)	1,284	1,127
Total investment securities	28,496	26,897
Loans and leases, net of unearned discount of $928 at March 31, 2024 and $868 at December 31, 2023	134,973	134,068
Allowance for credit losses	(2,191)	(2,129)
Loans and leases, net	132,782	131,939
Premises and equipment	1,707	1,739
Goodwill	8,465	8,465
Core deposit and other intangible assets	132	147
Accrued interest and other assets	9,617	9,171
Total assets	215,137	208,264
Liabilities
Noninterest-bearing deposits	50,578	49,294
Savings and interest-checking deposits	96,339	93,221
Time deposits	20,279	20,759
Total deposits	167,196	163,274
Short-term borrowings	4,795	5,316
Accrued interest and other liabilities	4,527	4,516
Long-term borrowings	11,450	8,201
Total liabilities	187,968	181,307
Shareholders' equity
Preferred stock, $1.00 par, 20,000,000 shares authorized; Issued and outstanding: Liquidation preference of $1,000 per share: 350,000 shares at March 31, 2024 and December 31, 2023; Liquidation preference of $10,000 per share: 140,000 shares at March 31, 2024 and December 31, 2023; Liquidation preference of $25 per share: 10,000,000 shares at March 31, 2024 and December 31, 2023	2,011	2,011
Common stock, $0.50 par, 250,000,000 shares authorized, 179,436,779 shares issued at March 31, 2024 and December 31, 2023	90	90
Common stock issuable, [11,458] shares at March 31, 2024; 12,217 shares at December 31, 2023	1	1
Additional paid-in capital	9,976	10,020
Retained earnings	17,812	17,524
Accumulated other comprehensive income (loss), net	(589)	(459)
Treasury stock - common, at cost - [12,724,121] shares at March 31, 2024; 13,300,298 shares at December 31, 2023	(2,132)	(2,230)
Total shareholders’ equity	27,169	26,957
Total liabilities and shareholders’ equity	$ 215,137	$ 208,264

Consolidated Balance Sheet (U_2

Consolidated Balance Sheet (Unaudited) (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Investment securities, available for sale, amortized cost	$ 12,397	$ 10,691
Investment securities, held to maturity, fair value	13,865	14,308
Equity and other securities, cost	1,279	1,125
Loans and leases, unearned discount	$ 928	$ 868
Preferred stock, par value	$ 1	$ 1
Preferred stock, shares authorized	20,000,000	20,000,000
Preferred stock, shares issued	10,000,000	10,000,000
Preferred stock, liquidation preference per share	$ 25	$ 25
Common stock, par value	$ 0.50	$ 0.50
Common stock, shares authorized	250,000,000	250,000,000
Common stock, shares issued	179,436,779	179,436,779
Common stock issuable, shares	11,458	12,217
Treasury stock, common shares	12,724,121	13,300,298
Series A Series C Series And E Preferred Stock [Member]
Preferred stock, shares issued	350,000	350,000
Preferred stock, shares outstanding	350,000	350,000
Preferred stock, liquidation preference per share	$ 1,000	$ 1,000
Series F And Series G Preferred Stock [Member]
Preferred stock, shares issued	140,000	140,000
Preferred stock, shares outstanding	140,000	140,000
Preferred stock, liquidation preference per share	$ 10,000	$ 10,000

Consolidated Statement of Incom

Consolidated Statement of Income (Unaudited) - USD ($) shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Interest income
Loans and leases, including fees	$ 2,097	$ 1,850
Investment securities
Fully taxable	212	181
Exempt from federal taxes	16	17
Deposits at banks	419	278
Other	1	1
Total interest income	2,745	2,327
Interest expense
Savings and interest-checking deposits	615	277
Time deposits	225	89
Short-term borrowings	84	58
Long-term borrowings	141	85
Total interest expense	1,065	509
Net interest income	1,680	1,818
Provision for credit losses	200	120
Net interest income after provision for credit losses	1,480	1,698
Other income
Brokerage services income	29	24
Trading account and other non-hedging derivative gains	9	12
Gain (loss) on bank investment securities	2
Other revenues from operations	152	159
Total other income	580	587
Other expense
Salaries and employee benefits	833	808
Equipment and net occupancy	129	127
Outside data processing and software	120	106
Professional and other services	85	125
FDIC assessments	60	30
Advertising and marketing	20	31
Amortization of core deposit and other intangible assets	15	17
Other costs of operations	134	115
Total other expense	1,396	1,359
Income before taxes	664	926
Income taxes	133	224
Net income	531	702
Net income available to common shareholders
Basic	505	676
Diluted	$ 505	$ 676
Net income per common share
Basic	$ 3.04	$ 4.03
Diluted	$ 3.02	$ 4.01
Average common shares outstanding
Basic	166,460	167,732
Diluted	167,084	168,410
Mortgage Banking Revenues [Member]
Other income
Revenue from contract with customer	$ 104	$ 85
Service Charges on Deposit Accounts [Member]
Other income
Revenue from contract with customer	124	113
Trust Income [Member]
Other income
Revenue from contract with customer	$ 160	$ 194

Consolidated Statement of Compr

Consolidated Statement of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Partners' Capital [Abstract]
Net Income (Loss)	$ 531	$ 702
Other comprehensive income (loss), net of tax and reclassification adjustments:
Net unrealized gains (losses) on investment securities	(10)	65
Cash flow hedges adjustments	(117)	81
Defined benefit plans liability adjustments	(1)	(2)
Foreign currency translation adjustments	(2)	1
Total other comprehensive income (loss)	(130)	145
Total comprehensive income	$ 401	$ 847

Consolidated Statement of Cash

Consolidated Statement of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities
Net Income (Loss)	$ 531	$ 702
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	200	120
Depreciation and amortization of premises and equipment	80	76
Amortization of capitalized servicing rights	35	20
Amortization of core deposit and other intangible assets	15	17
Provision for deferred income taxes	2	11
Asset write-downs	6	1
Net gain on sales of assets	(1)	(12)
Net change in accrued interest receivable, payable	27	55
Net change in other accrued income and expense	(74)	(43)
Net change in loans originated for sale	(352)	(274)
Net change in trading account and other non-hedging derivative assets and liabilities	139	(245)
Net cash provided by operating activities	608	428
Cash flows from investing activities
Proceeds from sales of investment securities available for sale	4
Proceeds from sales of investment securities equity and other	110	521
Proceeds from maturities of investment securities Available for sale	1,989	141
Proceeds from maturities of investment securities Held to maturity	257	281
Purchases of investment securities Available for sale	(4,145)	(337)
Purchases of investment securities Held to maturity		(2,948)
Purchases of investment securities equity and other	(264)	(792)
Net increase in loans and leases	(724)	(1,166)
Net (increase) decrease in interest-bearing deposits at banks	(4,075)	2,652
Capital expenditures, net	(35)	(55)
Net decrease in loan servicing advances	81	207
Other, net	(280)	(251)
Net cash used by investing activities	(7,082)	(1,747)
Cash flows from financing activities
Net increase (decrease) in deposits	3,921	(4,441)
Net increase (decrease) in short-term borrowings	(521)	3,440
Proceeds from long-term borrowings	3,357	3,486
Payments on long-term borrowings	(49)
Purchases of treasury stock		(594)
Dividends paid — common	(221)	(221)
Dividends paid — preferred	(34)	(34)
Other, net	(15)	(19)
Net cash provided by financing activities	6,438	1,617
Net increase (decrease) in cash, cash equivalents and restricted cash	(36)	298
Cash, cash equivalents and restricted cash at beginning of period	1,731	1,520
Cash, cash equivalents and restricted cash at end of period	1,695	1,818
Supplemental disclosure of cash flow information
Interest received during the period	2,716	2,289
Interest paid during the period	999	410
Income taxes paid during the period	41	22
Supplemental schedule of noncash investing and financing activities
Real estate acquired in settlement of loans	19	7
Additions to right-of-use assets under operating leases	$ 19	$ 31

Consolidated Statement of Chang

Consolidated Statement of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Millions		Total	Preferred Stock [Member]	Common Stock [Member]	Common Stock Issuable [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss), Net [Member]	Treasury Stock [Member]
Beginning balance at Dec. 31, 2022		$ 25,318	$ 2,011	$ 90	$ 1	$ 10,002	$ 15,754	$ (790)	$ (1,750)
Total comprehensive income		847					702	145
Preferred stock cash dividends	[1]	(25)					(25)
Purchases of treasury stock		(600)							(600)
Stock-based compensation transactions, net		55				(16)	(1)		72
Common stock cash dividends		(218)					(218)
Ending balance at Mar. 31, 2023		25,377	2,011	90	1	9,986	16,212	(645)	(2,278)
Beginning balance at Dec. 31, 2023		26,957	2,011	90	1	10,020	17,524	(459)	(2,230)
Total comprehensive income		401					531	(130)
Preferred stock cash dividends	[1]	(25)					(25)
Stock-based compensation transactions, net		54				(44)			98
Common stock cash dividends		(218)					(218)
Ending balance at Mar. 31, 2024		$ 27,169	$ 2,011	$ 90	$ 1	$ 9,976	$ 17,812	$ (589)	$ (2,132)
[1] For the three-month periods ended March 31, 2024 and 2023 , dividends per preferred share were: Preferred Series E - $ 16.125 ; Preferred Series F - $ 128.125 ; Preferred Series G - $ 125.00 ; Preferred Series H - $ 0.3516 ; and Preferred Series I - $ 87.50 .

Consolidated Statement of Cha_2

Consolidated Statement of Changes in Shareholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Preferred Series E [Member]
Preferred stock per share dividend amount	$ 16.125	$ 16.125
Preferred Series F [Member]
Preferred stock per share dividend amount	128.125	128.125
Preferred Series G [Member]
Preferred stock per share dividend amount	125	125
Preferred Series H [Member]
Preferred stock per share dividend amount	0.3516	0.3516
Preferred Series I [Member]
Preferred stock per share dividend amount	87.5	87.5
Retained Earnings [Member]
Common stock per share dividend amount	$ 1.3	$ 1.3

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Pay vs Performance Disclosure
Net Income (Loss)	$ 531	$ 702

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Mar. 31, 2024
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Significant accounting policies

Significant accounting policies	3 Months Ended
	Mar. 31, 2024
Accounting Policies [Abstract]
Significant accounting policies	1. Significant accounting policies The consolidated interim financial statements of the Company were compiled in accordance with GAAP using the accounting policies set forth in note 1 of Notes to Financial Statements included in the 2023 Annual Report, except as described in the following table. The financial statements contain all adjustments which are, in the opinion of management, necessary for a fair statement of the Company's financial position, results of operations and cash flows for the interim periods presented. Recent accounting developments Standard Description Required date of adoption Effect on consolidated financial statements Standards Adopted in 2024 Accounting for Investments in Tax Credit Structures Using the Proportional Amortization Method The amendments permit an election to account for tax equity investments, regardless of the tax credit program from which the income tax credits are received, using the proportional amortization method if certain conditions are met. Under the proportional amortization method, the initial cost of the investment is amortized in proportion to the income tax credits and other income tax benefits received and the net amortization and income tax credits and other income tax benefits are recognized in the income statement as a component of income tax expense (benefit). January 1, 2024 As described in note 11, the Company adopted the amended guidance effective January 1, 2024 using a modified retrospective transition. The guidance did not have a material impact on the Company’s consolidated financial statements.

Divestiture

Divestiture	3 Months Ended
	Mar. 31, 2024
Business Combinations [Abstract]
Divestiture	2. Divestiture On April 29, 2023, the Company sold its CIT business to a private equity firm. The transaction resulted in a pre-tax gain of $ 225 million ($ 157 million after-tax effect) that has been included in “other revenues from operations” in the Consolidated Statement of Income in the second quarter of 2023. Prior to the sale, the CIT business contributed $ 45 million to trust income in the three months ended March 31, 2023. After considering expenses, the results of operations from the CIT business were not material to the Company's consolidated results of operations in that period.

Investment securities

Investment securities	3 Months Ended
	Mar. 31, 2024
Investments, Debt and Equity Securities [Abstract]
Investment securities	3. Investment securities The amortized cost and estimated fair value of investment securities were as follows: (Dollars in millions) Amortized Gross Gross Estimated March 31, 2024 Investment securities available for sale: U.S. Treasury and federal agencies $ 7,818 $ — $ 99 $ 7,719 Mortgage-backed securities: Government issued or guaranteed: Commercial 1,355 1 13 1,343 Residential 3,053 — 143 2,910 Other debt securities 171 — 9 162 12,397 1 264 12,134 Investment securities held to maturity: U.S. Treasury and federal agencies 1,007 — 33 974 Obligations of states and political subdivisions 2,466 — 94 2,372 Mortgage-backed securities: Government issued or guaranteed: Commercial 2,035 — 154 1,881 Residential 9,527 — 935 8,592 Privately issued 41 9 6 44 Other debt securities 2 — — 2 15,078 9 1,222 13,865 Total debt securities $ 27,475 $ 10 $ 1,486 $ 25,999 Equity and other securities: Readily marketable equity — at fair value $ 351 $ 8 $ 3 $ 356 Other — at cost 928 — — 928 Total equity and other securities $ 1,279 $ 8 $ 3 $ 1,284 December 31, 2023 Investment securities available for sale: U.S. Treasury and federal agencies $ 7,818 $ — $ 113 $ 7,705 Mortgage-backed securities: Government issued or guaranteed: Commercial 425 — 9 416 Residential 2,272 — 118 2,154 Other debt securities 176 — 11 165 10,691 — 251 10,440 Investment securities held to maturity: U.S. Treasury and federal agencies 1,005 — 31 974 Obligations of states and political subdivisions 2,501 — 67 2,434 Mortgage-backed securities: Government issued or guaranteed: Commercial 2,033 — 130 1,903 Residential 9,747 4 802 8,949 Privately issued 42 9 5 46 Other debt securities 2 — — 2 15,330 13 1,035 14,308 Total debt securities $ 26,021 $ 13 $ 1,286 $ 24,748 Equity and other securities: Readily marketable equity — at fair value $ 266 $ 5 $ 3 $ 268 Other — at cost 859 — — 859 Total equity and other securities $ 1,125 $ 5 $ 3 $ 1,127 3. Investment securities, continued There were no significant gross realized gains or losses from sales of investment securities for the three-month periods ended March 31, 2024 and 2023. Unrealized losses on equity securities are included in "gain (loss) on bank investment securities" in the Consolidated Statement of Income. At March 31, 2024, the amortized cost and estimated fair value of debt securities by contractual maturity were as follows: (Dollars in millions) Amortized Estimated Debt securities available for sale: Due in one year or less $ 3,248 $ 3,209 Due after one year through five years 4,691 4,628 Due after five years through ten years 50 44 Due after ten years — — 7,989 7,881 Mortgage-backed securities 4,408 4,253 $ 12,397 $ 12,134 Debt securities held to maturity: Due in one year or less $ 588 $ 575 Due after one year through five years 635 611 Due after five years through ten years 1,369 1,333 Due after ten years 883 829 3,475 3,348 Mortgage-backed securities 11,603 10,517 $ 15,078 $ 13,865 3. Investment securities, continued A summary of investment securities that as of March 31, 2024 and December 31, 2023 had been in a continuous unrealized loss position for less than twelve months and those that had been in a continuous unrealized loss position for twelve months or longer follows: Less Than 12 Months 12 Months or More (Dollars in millions) Fair Unrealized Fair Unrealized March 31, 2024 Investment securities available for sale: U.S. Treasury and federal agencies $ 2,242 $ 10 $ 5,177 $ 89 Mortgage-backed securities: Government issued or guaranteed: Commercial 765 6 393 7 Residential 813 6 1,964 137 Other debt securities — — 156 9 3,820 22 7,690 242 Investment securities held to maturity: U.S. Treasury and federal agencies 49 1 925 32 Obligations of states and political subdivisions 43 — 2,284 94 Mortgage-backed securities: Government issued or guaranteed: Commercial 172 9 1,709 145 Residential 1,133 12 7,459 923 Privately issued — — 33 6 1,397 22 12,410 1,200 Total $ 5,217 $ 44 $ 20,100 $ 1,442 December 31, 2023 Investment securities available for sale: U.S. Treasury and federal agencies $ 229 $ 1 $ 7,474 $ 112 Mortgage-backed securities: Government issued or guaranteed: Commercial 74 1 330 8 Residential 151 2 1,959 116 Other debt securities 6 — 154 11 460 4 9,917 247 Investment securities held to maturity: U.S. Treasury and federal agencies 50 — 924 31 Obligations of states and political subdivisions 218 3 2,172 64 Mortgage-backed securities: Government issued or guaranteed: Commercial 328 9 1,575 121 Residential 955 11 7,139 791 Privately issued — — 34 5 1,551 23 11,844 1,012 Total $ 2,011 $ 27 $ 21,761 $ 1,259 3. Investment securities, continued The Company owned 4,088 individual debt securities with aggregate gross unrealized losses of $ 1.5 billion at March 31, 2024. Based on a review of each of the securities in the investment securities portfolio at March 31, 2024, the Company concluded that it expected to recover the amortized cost basis of its investment. As of March 31, 2024, the Company does not intend to sell, nor is it anticipated that it would be required to sell, any of its impaired investment securities at a loss. At March 31, 2024 , the Company has not identified events or changes in circumstances which may have a significant adverse effect on the fair value of the $ 928 million of cost method equity securities. The Company estimated no material allowance for credit losses for its investment securities classified as held-to-maturity at March 31, 2024 or December 31, 2023. At March 31, 2024 and December 31, 2023 , investment securities with carrying values of $ 9.6 billion (including $ 357 million related to repurchase transactions) and $ 8.2 billion (including $ 393 million related to repurchase transactions), respectively, were pledged to secure borrowings, lines of credit and governmental deposits.

Loans and leases and the allowa

Loans and leases and the allowance for credit losses	3 Months Ended
	Mar. 31, 2024
Receivables [Abstract]
Loans and leases and the allowance for credit losses	4. Loans and leases and the allowance for credit losses A summary of current, past due and nonaccrual loans as of March 31, 2024 and December 31, 2023 follows: (Dollars in millions) Current 30-89 Days Accruing Past Nonaccrual Total March 31, 2024 Commercial and industrial $ 56,803 $ 219 $ 11 $ 864 $ 57,897 Real estate: Commercial (a) 24,119 163 31 855 25,168 Residential builder and developer 984 48 — 3 1,035 Other commercial construction 5,915 155 2 141 6,213 Residential (b) 21,118 627 245 202 22,192 Residential — limited documentation 801 30 — 53 884 Consumer: Home equity lines and loans 4,437 34 — 87 4,558 Recreational finance 10,553 71 — 30 10,654 Automobile 4,252 43 — 13 4,308 Other 1,982 20 8 54 2,064 Total $ 130,964 $ 1,410 $ 297 $ 2,302 $ 134,973 December 31, 2023 Commercial and industrial $ 56,091 $ 238 $ 11 $ 670 $ 57,010 Real estate: Commercial (a) 24,072 311 25 869 25,277 Residential builder and developer 1,065 5 — 3 1,073 Other commercial construction 6,322 159 1 171 6,653 Residential (b) 21,080 763 295 215 22,353 Residential — limited documentation 825 31 — 55 911 Consumer: Home equity lines and loans 4,528 40 — 81 4,649 Recreational finance 9,935 87 — 36 10,058 Automobile 3,918 60 — 14 3,992 Other 2,003 30 7 52 2,092 Total $ 129,839 $ 1,724 $ 339 $ 2,166 $ 134,068 (a) Commercial real estate loans held for sale were $ 563 million at March 31, 2024 and $ 189 million at December 31, 2023. (b) One-to-four family residential mortgage loans held for sale were $ 165 million at March 31, 2024 and $ 190 million at December 31, 2023 . 4. Loans and leases and the allowance for credit losses, continued Credit quality indicators The Company utilizes a loan grading system to differentiate risk amongst its commercial and industrial loans and commercial real estate loans. Loans with a lower expectation of default are assigned one of ten possible “pass” loan grades and are generally ascribed lower loss factors when determining the allowance for credit losses. Loans with an elevated level of credit risk are classified as “criticized” and are ascribed a higher loss factor when determining the allowance for credit losses. Criticized loans may be classified as “nonaccrual” if the Company no longer expects to collect all amounts according to the contractual terms of the loan agreement or the loan is delinquent 90 days or more. Line of business personnel in different geographic locations with support from and review by the Company’s credit risk personnel review and reassign loan grades based on their detailed knowledge of individual borrowers and their judgment of the impact on such borrowers resulting from changing conditions in their respective regions. Factors considered in assigning loan grades include borrower-specific information related to expected future cash flows and operating results, collateral values, geographic location, financial condition and performance, payment status, and other information. The Company’s policy is that at least annually, updated financial information be obtained from commercial borrowers associated with pass grade loans and additional analysis performed. On a quarterly basis, the Company’s credit personnel review all criticized commercial and industrial loans and commercial real estate loans greater than $ 5 million to determine the appropriateness of the assigned loan grade, including whether the loan should be reported as accruing or nonaccruing. The following table summarizes the loan grades applied at March 31, 2024 to the various classes of the Company’s commercial and industrial loans and commercial real estate loans and gross charge-offs for those types of loans for the three-month period ended March 31, 2024 by origination year. Term Loans by Origination Year Revolving Revolving Loans Converted to Term (Dollars in millions) 2024 2023 2022 2021 2020 Prior Loans Loans Total Commercial and industrial: Pass $ 2,012 $ 8,129 $ 7,567 $ 4,441 $ 2,099 $ 6,456 $ 22,719 $ 74 $ 53,497 Criticized accrual 32 306 422 277 117 602 1,745 35 3,536 Criticized nonaccrual 2 54 89 62 71 206 364 16 864 Total commercial and industrial $ 2,046 $ 8,489 $ 8,078 $ 4,780 $ 2,287 $ 7,264 $ 24,828 $ 125 $ 57,897 Gross charge-offs $ — $ 7 $ 9 $ 4 $ 3 $ 5 $ 50 $ — $ 78 Real estate: Commercial: Pass $ 696 $ 1,783 $ 1,652 $ 1,331 $ 2,013 $ 11,278 $ 435 $ — $ 19,188 Criticized accrual — 273 815 464 558 3,008 7 — 5,125 Criticized nonaccrual — — 46 11 101 695 2 — 855 Total commercial real estate $ 696 $ 2,056 $ 2,513 $ 1,806 $ 2,672 $ 14,981 $ 444 $ — $ 25,168 Gross charge-offs $ — $ — $ — $ — $ — $ 13 $ — $ — $ 13 Residential builder and Pass $ 89 $ 509 $ 187 $ 34 $ 5 $ 14 $ 102 $ — $ 940 Criticized accrual — 2 21 21 — 46 2 — 92 Criticized nonaccrual — — — 2 — 1 — — 3 Total residential builder $ 89 $ 511 $ 208 $ 57 $ 5 $ 61 $ 104 $ — $ 1,035 Gross charge-offs $ — $ — $ — $ — $ — $ 1 $ — $ — $ 1 Other commercial construction: Pass $ 27 $ 990 $ 1,231 $ 590 $ 273 $ 589 $ 45 $ — $ 3,745 Criticized accrual — 75 538 460 567 687 — — 2,327 Criticized nonaccrual — — 11 10 45 75 — — 141 Total other commercial $ 27 $ 1,065 $ 1,780 $ 1,060 $ 885 $ 1,351 $ 45 $ — $ 6,213 Gross charge-offs $ — $ — $ 2 $ — $ — $ 7 $ 2 $ — $ 11 4. Loans and leases and the allowance for credit losses, continued The Company considers repayment performance a significant indicator of credit quality for its residential real estate loan and consumer loan portfolios. A summary of loans in accrual and nonaccrual status at March 31, 2024 for the various classes of the Company’s residential real estate loans and consumer loans and gross charge-offs for those types of loans for the three-month period ended March 31, 2024 by origination year follows: Term Loans by Origination Year Revolving Revolving Loans Converted to Term (Dollars in millions) 2024 2023 2022 2021 2020 Prior Loans Loans Total Residential: Current $ 478 $ 1,499 $ 4,667 $ 3,717 $ 2,533 $ 8,131 $ 93 $ — $ 21,118 30-89 days past due — 6 107 62 30 422 — — 627 Accruing loans past due — 2 21 19 15 188 — — 245 Nonaccrual — 1 15 10 2 173 1 — 202 Total residential $ 478 $ 1,508 $ 4,810 $ 3,808 $ 2,580 $ 8,914 $ 94 $ — $ 22,192 Gross charge-offs $ — $ — $ — $ — $ — $ 1 $ — $ — $ 1 Residential - limited documentation: Current $ — $ — $ — $ — $ — $ 801 $ — $ — $ 801 30-89 days past due — — — — — 30 — — 30 Accruing loans past due — — — — — — — — — Nonaccrual — — — — — 53 — — 53 Total residential - limited $ — $ — $ — $ — $ — $ 884 $ — $ — $ 884 Gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — $ — Consumer: Home equity lines and loans: Current $ — $ — $ — $ 2 $ 2 $ 105 $ 2,972 $ 1,356 $ 4,437 30-89 days past due — — — — — 3 — 31 34 Accruing loans past due — — — — — — — — — Nonaccrual — — — — — 5 1 81 87 Total home equity lines and loans $ — $ — $ — $ 2 $ 2 $ 113 $ 2,973 $ 1,468 $ 4,558 Gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ 1 $ 1 Recreational finance: Current $ 1,028 $ 2,531 $ 2,252 $ 1,790 $ 1,233 $ 1,719 $ — $ — $ 10,553 30-89 days past due 1 11 12 14 13 20 — — 71 Accruing loans past due — — — — — — — — — Nonaccrual — 4 6 6 4 10 — — 30 Total recreational finance $ 1,029 $ 2,546 $ 2,270 $ 1,810 $ 1,250 $ 1,749 $ — $ — $ 10,654 Gross charge-offs $ — $ 3 $ 5 $ 6 $ 4 $ 7 $ — $ — $ 25 Automobile: Current $ 684 $ 1,026 $ 1,004 $ 942 $ 371 $ 225 $ — $ — $ 4,252 30-89 days past due 1 7 11 11 6 7 — — 43 Accruing loans past due — — — — — — — — — Nonaccrual — 2 2 3 2 4 — — 13 Total automobile $ 685 $ 1,035 $ 1,017 $ 956 $ 379 $ 236 $ — $ — $ 4,308 Gross charge-offs $ — $ 2 $ 2 $ 2 $ 1 $ 1 $ — $ — $ 8 Other: Current $ 69 $ 219 $ 155 $ 105 $ 28 $ 27 $ 1,378 $ 1 $ 1,982 30-89 days past due 1 1 3 1 — 1 12 1 20 Accruing loans past due — — — — — — 8 — 8 Nonaccrual 1 1 1 — — — 51 — 54 Total other $ 71 $ 221 $ 159 $ 106 $ 28 $ 28 $ 1,449 $ 2 $ 2,064 Gross charge-offs $ 1 $ 3 $ 3 $ 1 $ 1 $ — $ 16 $ — $ 25 Total loans and leases at $ 5,121 $ 17,431 $ 20,835 $ 14,385 $ 10,088 $ 35,581 $ 29,937 $ 1,595 $ 134,973 Total gross charge-offs for $ 1 $ 15 $ 21 $ 13 $ 9 $ 35 $ 68 $ 1 $ 163 4. Loans and leases and the allowance for credit losses, continued The following table summarizes the loan grades applied at December 31, 2023 to the various classes of the Company’s commercial and industrial loans and commercial real estate loans by origination year. Term Loans by Origination Year Revolving Revolving Loans Converted to Term (Dollars in millions) 2023 2022 2021 2020 2019 Prior Loans Loans Total Commercial and industrial: Pass $ 8,689 $ 8,087 $ 4,800 $ 2,248 $ 2,169 $ 4,843 $ 22,345 $ 70 $ 53,251 Criticized accrual 292 279 277 142 127 481 1,460 31 3,089 Criticized nonaccrual 29 68 56 75 36 150 243 13 670 Total commercial and industrial $ 9,010 $ 8,434 $ 5,133 $ 2,465 $ 2,332 $ 5,474 $ 24,048 $ 114 $ 57,010 Real estate: Commercial: Pass $ 2,048 $ 1,742 $ 1,367 $ 2,011 $ 3,059 $ 8,491 $ 440 $ — $ 19,158 Criticized accrual 227 891 465 456 966 2,238 7 — 5,250 Criticized nonaccrual — 46 3 113 93 611 3 — 869 Total commercial real estate $ 2,275 $ 2,679 $ 1,835 $ 2,580 $ 4,118 $ 11,340 $ 450 $ — $ 25,277 Residential builder and Pass $ 530 $ 252 $ 41 $ 6 $ 2 $ 12 $ 116 $ — $ 959 Criticized accrual 1 18 30 — 59 — 3 — 111 Criticized nonaccrual — — 3 — — — — — 3 Total residential builder $ 531 $ 270 $ 74 $ 6 $ 61 $ 12 $ 119 $ — $ 1,073 Other commercial construction: Pass $ 813 $ 1,366 $ 651 $ 373 $ 646 $ 187 $ 30 $ — $ 4,066 Criticized accrual 53 391 390 691 565 326 — — 2,416 Criticized nonaccrual — 14 10 46 50 49 2 — 171 Total other commercial $ 866 $ 1,771 $ 1,051 $ 1,110 $ 1,261 $ 562 $ 32 $ — $ 6,653 4. Loans and leases and the allowance for credit losses, continued A summary of loans in accrual and nonaccrual status at December 31, 2023 for the various classes of the Company’s residential real estate loans and consumer loans by origination year follows: Term Loans by Origination Year Revolving Revolving Loans Converted to Term (Dollars in millions) 2023 2022 2021 2020 2019 Prior Loans Loans Total Residential: Current $ 1,726 $ 4,709 $ 3,732 $ 2,543 $ 1,215 $ 7,060 $ 95 $ — $ 21,080 30-89 days past due 18 120 88 52 28 457 — — 763 Accruing loans past due 1 30 28 17 14 205 — — 295 Nonaccrual 1 17 10 3 4 179 1 — 215 Total residential $ 1,746 $ 4,876 $ 3,858 $ 2,615 $ 1,261 $ 7,901 $ 96 $ — $ 22,353 Residential - limited Current $ — $ — $ — $ — $ — $ 825 $ — $ — $ 825 30-89 days past due — — — — — 31 — — 31 Accruing loans past due — — — — — — — — — Nonaccrual — — — — — 55 — — 55 Total residential - limited $ — $ — $ — $ — $ — $ 911 $ — $ — $ 911 Consumer: Home equity lines and loans: Current $ — $ — $ 2 $ 2 $ 13 $ 98 $ 3,022 $ 1,391 $ 4,528 30-89 days past due — — — — — 3 — 37 40 Accruing loans past due — — — — — — — — — Nonaccrual — — — — — 5 3 73 81 Total home equity lines and $ — $ — $ 2 $ 2 $ 13 $ 106 $ 3,025 $ 1,501 $ 4,649 Recreational finance: Current $ 2,653 $ 2,338 $ 1,857 $ 1,286 $ 781 $ 1,020 $ — $ — $ 9,935 30-89 days past due 11 16 19 14 11 16 — — 87 Accruing loans past due — — — — — — — — — Nonaccrual 3 5 8 6 5 9 — — 36 Total recreational finance $ 2,667 $ 2,359 $ 1,884 $ 1,306 $ 797 $ 1,045 $ — $ — $ 10,058 Automobile: Current $ 1,063 $ 1,096 $ 1,047 $ 427 $ 198 $ 87 $ — $ — $ 3,918 30-89 days past due 8 15 17 9 6 5 — — 60 Accruing loans past due — — — — — — — — — Nonaccrual 2 3 3 2 2 2 — — 14 Total automobile $ 1,073 $ 1,114 $ 1,067 $ 438 $ 206 $ 94 $ — $ — $ 3,992 Other: Current $ 250 $ 176 $ 118 $ 33 $ 13 $ 18 $ 1,392 $ 3 $ 2,003 30-89 days past due 3 3 2 — — 1 20 1 30 Accruing loans past due — — — — — — 7 — 7 Nonaccrual 2 1 1 — — — 48 — 52 Total other $ 255 $ 180 $ 121 $ 33 $ 13 $ 19 $ 1,467 $ 4 $ 2,092 Total loans and leases at $ 18,423 $ 21,683 $ 15,025 $ 10,555 $ 10,062 $ 27,464 $ 29,237 $ 1,619 $ 134,068 4. Loans and leases and the allowance for credit losses, continued Allowance for credit losses For purposes of determining the level of the allowance for credit losses, the Company evaluates its loan and lease portfolio by type. Changes in the allowance for credit losses for the three months ended March 31, 2024 and 2023 were as follows: Commercial and Real Estate (Dollars in millions) industrial Commercial Residential Consumer Total Three Months Ended March 31, 2024 Beginning balance $ 620 $ 764 $ 116 $ 629 $ 2,129 Provision for credit losses 137 9 2 52 200 Net charge-offs: Charge-offs ( 78 ) ( 25 ) ( 1 ) ( 59 ) ( 163 ) Recoveries 5 6 1 13 25 Net charge-offs ( 73 ) ( 19 ) — ( 46 ) ( 138 ) Ending balance $ 684 $ 754 $ 118 $ 635 $ 2,191 Three Months Ended March 31, 2023 Beginning balance $ 568 $ 611 $ 115 $ 631 $ 1,925 Provision for credit losses 21 86 ( 1 ) 14 120 Net charge-offs: Charge-offs ( 20 ) ( 29 ) ( 2 ) ( 44 ) ( 95 ) Recoveries 10 1 1 13 25 Net charge-offs ( 10 ) ( 28 ) ( 1 ) ( 31 ) ( 70 ) Ending balance $ 579 $ 669 $ 113 $ 614 $ 1,975 Despite the allocation in the preceding tables, the allowance for credit losses is general in nature and is available to absorb losses from any loan or lease type. In determining the allowance for credit losses, accruing loans with similar risk characteristics are generally evaluated collectively. The Company utilizes statistically developed models to project principal balances over the remaining contractual lives of the loan portfolios and to determine estimated credit losses through a reasonable and supportable forecast period. Individual loan credit quality indicators, including loan grade and borrower repayment performance, can inform the models, which have been statistically developed based on historical correlations of credit losses with prevailing economic metrics, including unemployment, GDP and real estate prices. Model forecasts may be adjusted for inherent limitations or biases that have been identified through independent validation and back-testing of model performance to actual realized results. At each of March 31, 2024 and December 31, 2023, the Company utilized a reasonable and supportable forecast period of two years. Subsequent to this forecast period the Company reverted, ratably over a one-year period, to historical loss experience to inform its estimate of losses for the remaining contractual life of each portfolio. 4. Loans and leases and the allowance for credit losses, continued The Company also estimates losses attributable to specific troubled credits identified through both normal and targeted credit review processes. The amounts of specific loss components in the Company’s loan and lease portfolios are determined through a loan-by-loan analysis of larger balance commercial and industrial loans and commercial real estate loans that are in nonaccrual status. Such loss estimates are typically based on expected future cash flows, collateral values and other factors that may impact the borrower’s ability to pay. To the extent that those loans are collateral-dependent, they are evaluated based on the fair value of the loan’s collateral as estimated at or near the financial statement date. As the quality of a loan deteriorates to the point of classifying the loan as “criticized,” the process of obtaining updated collateral valuation information is usually initiated, unless it is not considered warranted given factors such as the relative size of the loan, the characteristics of the collateral or the age of the last valuation. In those cases where current appraisals may not yet be available, prior appraisals are utilized with adjustments, as deemed necessary, for estimates of subsequent declines in values as determined by line of business and/or loan workout personnel. Those adjustments are reviewed and assessed for reasonableness by the Company’s credit risk personnel. Accordingly, for real estate collateral securing larger nonaccrual commercial and industrial loans and commercial real estate loans, estimated collateral values are based on current appraisals and estimates of value. For non-real estate loans, collateral is assigned a discounted estimated liquidation value and, depending on the nature of the collateral, is verified through field exams or other procedures. In assessing collateral, real estate and non-real estate values are reduced by an estimate of selling costs. For residential real estate loans, including home equity loans and lines of credit, the excess of the loan balance over the net realizable value of the property collateralizing the loan is charged-off when the loan becomes 150 days delinquent. That charge-off is based on recent indications of value from external parties that are generally obtained shortly after a loan becomes nonaccrual. Loans to consumers that file for bankruptcy are generally charged-off to estimated net collateral value shortly after the Company is notified of such filings. When evaluating individual home equity loans and lines of credit for charge-off and for purposes of estimating losses in determining the allowance for credit losses, the Company gives consideration to the required repayment of any first lien positions related to collateral property. Changes in the amount of the allowance for credit losses reflect the outcome of the procedures described herein, including the impact of changes in macroeconomic forecasts as compared with previous forecasts, as well as the impact of portfolio concentrations, imprecision in economic forecasts, geopolitical conditions and other risk factors that might influence the loss estimation process. The Company’s reserve for off-balance sheet credit exposures was not material at March 31, 2024 and December 31, 2023. 4. Loans and leases and the allowance for credit losses, continued Information with respect to loans and leases that were considered nonaccrual at the beginning and end of the reporting period and the interest income recognized on such loans for the three-month periods ended March 31, 2024 and 2023 follows: Amortized Cost with Allowance Amortized Cost without Allowance Total Amortized Cost Interest Income Recognized (Dollars in millions) March 31, 2024 January 1, 2024 Three Months Ended March 31, Commercial and industrial $ 590 $ 274 $ 864 $ 670 $ 2 Real estate: Commercial 379 476 855 869 6 Residential builder and developer 3 — 3 3 — Other commercial construction 33 108 141 171 — Residential 82 120 202 215 3 Residential — limited documentation 18 35 53 55 1 Consumer: Home equity lines and loans 48 39 87 81 1 Recreational finance 18 12 30 36 — Automobile 7 6 13 14 — Other 54 — 54 52 — Total $ 1,232 $ 1,070 $ 2,302 $ 2,166 $ 13 (Dollars in millions) March 31, 2023 January 1, 2023 Three Months Ended March 31, Commercial and industrial $ 227 $ 342 $ 569 $ 504 $ 3 Real estate: Commercial 364 966 1,330 1,240 5 Residential builder and developer 3 — 3 1 — Other commercial construction 94 49 143 125 2 Residential 125 129 254 272 5 Residential — limited documentation 40 29 69 78 — Consumer: Home equity lines and loans 39 42 81 85 2 Recreational finance 24 10 34 45 — Automobile 23 4 27 40 — Other 47 — 47 49 — Total $ 986 $ 1,571 $ 2,557 $ 2,439 $ 17 4. Loans and leases and the allowance for credit losses, continued Loan modifications During the normal course of business, the Company modifies loans to maximize recovery efforts from borrowers experiencing financial difficulty. Such loan modifications typically include payment deferrals and interest rate reductions but may also include other modified terms. Those modified loans may be considered nonaccrual if the Company does not expect to collect the contractual cash flows owed under the loan agreement. The table that follows summarizes the Company’s loan modification activities to borrowers experiencing financial difficulty for the three-month periods ended March 31, 2024 and 2023: Amortized cost at March 31, 2024 (Dollars in millions) Payment Deferral Interest Rate Reduction Other Combination of Modification Types (a) Total (b) (c) Percent of Total Loan Class Three Months Ended March 31, 2024 Commercial and industrial $ 184 $ — $ — $ — $ 184 .32 % Real estate: Commercial 267 — — 3 270 1.07 Residential builder and developer 2 — — — 2 .18 Other commercial construction 131 — — — 131 2.11 Residential 48 — — 1 49 .22 Residential — limited documentation 2 — — — 2 .17 Consumer: Home equity lines and loans — — — — — — Recreational finance — — — — — — Automobile — — — — — — Other — — — — — — Total $ 634 $ — $ — $ 4 $ 638 .47 % Amortized cost at March 31, 2023 (Dollars in millions) Payment Deferral Interest Rate Reduction Other Combination of Modification Types (a) Total (b) (c) Percent of Total Loan Class Three Months Ended March 31, 2023 Commercial and industrial $ 70 $ — $ — $ — $ 70 .13 % Real estate: Commercial 94 — — — 94 .35 Residential builder and developer 8 — — — 8 .64 Other commercial construction 92 — — — 92 1.39 Residential 33 — — 2 35 .15 Residential — limited documentation 5 — — — 5 .51 Consumer: Home equity lines and loans — — — — — — Recreational finance — — — — — — Automobile — — — — — — Other — — — — — — Total $ 302 $ — $ — $ 2 $ 304 .23 % (a) Predominantly payment deferrals combined with interest rate reductions. (b) Includes approximately $ 44 million and $ 23 million of loans guaranteed by government-related entities (predominantly first lien residential mortgage loans) for the three-month periods ended March 31, 2024 and 2023, respectively. (c) Excludes unfunded commitments to extend credit totaling $ 29 million and $ 11 million for the three-month periods ended March 31, 2024 and 2023, respectively. 4. Loans and leases and the allowance for credit losses, continued The financial effects of the modifications for the three-month periods ended March 31, 2024 and 2023 include an increase in the weighted-average remaining term for commercial and industrial loans of 0.7 years and 1.2 years, respectively, for commercial real estate loans, inclusive of residential builder and development loans and other commercial construction loans of 0.8 years and 1.2 years, respectively, and for residential real estate loans of 11.4 years and 9.1 years, respectively. Modified loans to borrowers experiencing financial difficulty are subject to the allowance for credit losses methodology described herein, including the use of models to inform credit loss estimates and, to the extent larger balance commercial and industrial loans and commercial real estate loans are in nonaccrual status, a loan-by-loan analysis of expected credit losses on those individual loans. Loans to borrowers experiencing financial difficulty that were modified during the three months ended March 31, 2023 and for which there was a subsequent payment default during that period were not material. The following table summarizes the payment status, at March 31, 2024, of loans that were modified during the twelve-month period ended March 31, 2024. Payment status at March 31, 2024 (amortized cost) (Dollars in millions) Current 30-89 Days Past Due Past Due 90 Days or More (a) Total Twelve Months Ended March 31, 2024 Commercial and industrial $ 310 $ 7 $ 10 $ 327 Real estate: Commercial 715 33 24 772 Residential builder and developer 14 39 — 53 Other commercial construction 534 5 — 539 Residential (b) 112 35 30 177 Residential — limited documentation 6 2 — 8 Consumer: Home equity lines and loans 2 — — 2 Recreational finance — — — — Automobile — — — — Other — — — — Total $ 1,693 $ 121 $ 64 $ 1,878 (a) Predominantly loan modifications with payment deferrals. (b) Includes loans guaranteed by government-related entities classified as 30 to 89 days past due of $ 30 million and as past due 90 days or more of $ 27 million. The amount of foreclosed property held by the Company, predominantly consisting of residential real estate, was $ 38 million and $ 39 million at March 31, 2024 and December 31, 2023 , respectively. There were $ 165 million and $ 170 million at March 31, 2024 and December 31, 2023, respectively, of loans secured by residential real estate that were in the process of foreclosure. Of all loans in the process of foreclosure at March 31, 2024 , approximately 35 % were government guaranteed. At March 31, 2024 , approximately $ 14.9 billion of commercial and industrial loans, including leases, $ 16.2 billion of commercial real estate loans, $ 18.6 billion of one-to-four family residential real estate loans, $ 2.6 billion of home equity loans and lines of credit and $ 10.9 billion of other consumer loans were pledged to secure outstanding borrowings and available lines of credit from FHLB and the FRB of New York. At December 31, 2023 , approximately $ 13.4 billion of commercial and industrial loans, including leases, $ 16.4 billion of commercial real estate loans, $ 18.8 billion of one-to-four family residential real estate loans, $ 2.6 billion of home equity loans and lines of credit and $ 11.0 billion of other consumer loans were pledged to secure outstanding borrowings and available lines of credit from the FHLB and the FRB of New York as described in note 5.

Borrowings

Borrowings	3 Months Ended
	Mar. 31, 2024
Debt Disclosure [Abstract]
Borrowings	5. Borrowings (Dollars in millions) March 31, 2024 December 31, 2023 Short-term borrowings Federal funds purchased and repurchase agreements $ 295 $ 316 FHLB advances 4,500 5,000 Total short-term borrowings $ 4,795 $ 5,316 Long-term borrowings Senior notes - M&T $ 3,276 $ 2,482 Senior notes - M&T Bank 3,743 3,741 FHLB advances 2,005 5 Subordinated notes - M&T 75 76 Subordinated notes - M&T Bank 866 873 Junior subordinated debentures - M&T 541 540 Asset-backed notes 934 474 Other 10 10 Total long-term borrowings $ 11,450 $ 8,201 In February 2024, M&T Bank advanced $ 2.0 billion from the FHLB of New York which matures in February 2025 at a variable rate of SOFR plus 25 basis points payable quarterly until maturity. In March 2024, M&T issued $ 850 million of senior notes that mature in March 2032 and pay a 6.082 % fixed rate semi-annually until March 2031 after which SOFR plus 2.26 % will be paid quarterly until maturity. Also in March 2024, M&T Bank issued asset-backed notes secured by automobile loans. A total of $ 511 million of such notes were purchased by third parties. Those asset-backed notes had a weighted-average estimated life of approximately two years and a weighted-average interest rate of 5.29 % at the time of securitization. Further information about this financing transaction is provided in note 11. M&T Bank had secured borrowing facilities available with the FHLB of New York and the FRB of New York totaling approximately $ 14.6 billion and $ 18.4 billion, respectively, at March 31, 2024 . M&T Bank is required to pledge loans and investment securities as collateral for these borrowing facilities and could increase the availability under such facilities by pledging additional assets.

Revenue from contracts with cus

Revenue from contracts with customers	3 Months Ended
	Mar. 31, 2024
Revenue from Contract with Customer [Abstract]
Revenue from contracts with customers	6. Revenue from contracts with customers The Company generally charges customer accounts or otherwise bills customers upon completion of its services. Typically, the Company’s contracts with customers have a duration of one year or less and payment for services is received at least annually, but oftentimes more frequently as services are provided. At March 31, 2024 and December 31, 2023 , the Company had $ 63 million and $ 68 million, respectively, of amounts receivable related to recognized revenue from the sources in the accompanying tables. Such amounts are classified in "accrued interest and other assets" in the Company’s Consolidated Balance Sheet. In certain situations, the Company is paid in advance of providing services and defers the recognition of revenue until its service obligation is satisfied. At March 31, 2024 and December 31, 2023 , the Company had deferred revenue of $ 52 million and $ 54 million, respectively, related to the sources in the accompanying tables recorded in "accrued interest and other liabilities" in the Consolidated Balance Sheet. The following tables summarize sources of the Company’s noninterest income during the three-month periods ended March 31, 2024 and 2023 that are subject to the revenue recognition accounting guidance. (Dollars in millions) Commercial Bank Retail Bank Institutional Services and Wealth Management Total Three Months Ended March 31, 2024 Classification in Consolidated Service charges on deposit accounts $ 40 $ 84 $ — $ 124 Trust income 1 — 159 160 Brokerage services income 2 — 27 29 Other revenues from operations: Merchant discount and credit card interchange fees 17 20 — 37 Other 8 7 2 17 $ 68 $ 111 $ 188 $ 367 Three Months Ended March 31, 2023 Classification in Consolidated Service charges on deposit accounts $ 34 $ 79 $ — $ 113 Trust income — — 194 194 Brokerage services income 2 — 22 24 Other revenues from operations: Merchant discount and credit card interchange fees 17 20 — 37 Other 6 8 1 15 $ 59 $ 107 $ 217 $ 383

Pension plans and other postret

Pension plans and other postretirement benefits	3 Months Ended
	Mar. 31, 2024
Retirement Benefits [Abstract]
Pension plans and other postretirement benefits	7. Pension plans and other postretirement benefits The Company provides defined pension and other postretirement benefits (including health care and life insurance benefits) to qualified retired employees. Net periodic benefit for defined benefit plans consisted of the following: Pension Other Three Months Ended March 31, (Dollars in millions) 2024 2023 2024 2023 Service cost $ 2 $ 3 $ — $ — Interest cost on projected benefit obligation 29 29 1 1 Expected return on plan assets ( 51 ) ( 51 ) — — Amortization of net actuarial gain — ( 1 ) ( 1 ) ( 1 ) Net periodic benefit $ ( 20 ) $ ( 20 ) $ — $ — Service cost is reflected in "salaries and employee benefits" and the other components of net periodic benefit cost are reflected in "other costs of operations" in the Consolidated Statement of Income. Expenses incurred in connection with the Company's defined contribution pension and retirement savings plans totaled $ 45 million and $ 44 million for the three months ended March 31, 2024 and 2023 , respectively.

Earnings per common share

Earnings per common share	3 Months Ended
	Mar. 31, 2024
Earnings Per Share [Abstract]
Earnings per common share	8. Earnings per common share The computations of basic earnings per common share follow: Three Months Ended March 31, (Dollars in millions, except per share, shares in thousands) 2024 2023 Income available to common shareholders: Net income $ 531 $ 702 Less: Preferred stock dividends ( 25 ) ( 25 ) Net income available to common equity 506 677 Less: Income attributable to unvested stock-based ( 1 ) ( 1 ) Net income available to common shareholders $ 505 $ 676 Weighted-average shares outstanding: Common shares outstanding (including common stock 166,738 168,010 Less: Unvested stock-based compensation awards ( 278 ) ( 278 ) Weighted-average shares outstanding 166,460 167,732 Basic earnings per common share $ 3.04 $ 4.03 The computations of diluted earnings per common share follow: Three Months Ended March 31, (Dollars in millions, except per share, shares in thousands) 2024 2023 Net income available to common equity $ 506 $ 677 Less: Income attributable to unvested stock-based ( 1 ) ( 1 ) Net income available to common shareholders $ 505 $ 676 Adjusted weighted-average shares outstanding: Common shares outstanding (including common stock 166,738 168,010 Less: Unvested stock-based compensation awards ( 278 ) ( 278 ) Plus: Incremental shares from assumed conversion 624 678 Adjusted weighted-average shares outstanding 167,084 168,410 Diluted earnings per common share $ 3.02 $ 4.01 GAAP defines unvested share-based awards that contain nonforfeitable rights to dividends or dividend equivalents (whether paid or unpaid) as participating securities that shall be included in the computation of earnings per common share pursuant to the two-class method. The Company has issued stock-based compensation awards in the form of restricted stock and restricted stock units which, in accordance with GAAP, are considered participating securities. Stock-based compensation awards to purchase common stock of M&T representing 1,328,190 common shares and 1,367,054 common shares during the three months ended March 31, 2024 and 2023 , respectively, were not included in the computations of diluted earnings per common share because the effect on those periods would have been antidilutive.

Comprehensive income

Comprehensive income	3 Months Ended
	Mar. 31, 2024
Equity [Abstract]
Comprehensive income	9. Comprehensive income The following tables display the components of other comprehensive income (loss) and amounts reclassified from accumulated other comprehensive income (loss) to net income: Investment Cash Flow Defined Benefit Total Income (Dollars in millions) Securities Hedges Plans Other Before Tax Tax Net Balance — January 1, 2024 $ ( 251 ) $ ( 203 ) $ ( 155 ) $ ( 7 ) $ ( 616 ) $ 157 $ ( 459 ) Other comprehensive income (loss) before reclassifications: Unrealized holding losses, net ( 13 ) — — — ( 13 ) 2 ( 11 ) Foreign currency translation adjustment — — — ( 2 ) ( 2 ) — ( 2 ) Unrealized losses on cash flow hedges — ( 243 ) — — ( 243 ) 60 ( 183 ) Total other comprehensive income (loss) before ( 13 ) ( 243 ) — ( 2 ) ( 258 ) 62 ( 196 ) Amounts reclassified from accumulated other comprehensive Losses realized in net income 1 — — — 1 — 1 Net yield adjustment from cash flow hedges — 87 — — 87 (a) ( 21 ) 66 Amortization of actuarial losses — — ( 1 ) — ( 1 ) (b) — ( 1 ) Total other comprehensive income (loss) ( 12 ) ( 156 ) ( 1 ) ( 2 ) ( 171 ) 41 ( 130 ) Balance — March 31, 2024 $ ( 263 ) $ ( 359 ) $ ( 156 ) $ ( 9 ) $ ( 787 ) $ 198 $ ( 589 ) Balance — January 1, 2023 $ ( 444 ) $ ( 336 ) $ ( 273 ) $ ( 13 ) $ ( 1,066 ) $ 276 $ ( 790 ) Other comprehensive income (loss) before reclassifications: Unrealized holding gains, net 89 — — — 89 ( 24 ) 65 Foreign currency translation adjustment — — — 2 2 ( 1 ) 1 Unrealized losses on cash flow hedges — 51 — — 51 ( 13 ) 38 Total other comprehensive income (loss) before 89 51 — 2 142 ( 38 ) 104 Amounts reclassified from accumulated other comprehensive Net yield adjustment from cash flow hedges — 59 — — 59 (a) ( 16 ) 43 Amortization of actuarial losses — — ( 2 ) — ( 2 ) (b) — ( 2 ) Total other comprehensive income (loss) 89 110 ( 2 ) 2 199 ( 54 ) 145 Balance — March 31, 2023 $ ( 355 ) $ ( 226 ) $ ( 275 ) $ ( 11 ) $ ( 867 ) $ 222 $ ( 645 ) (a) Included in "interest income" in the Consolidated Statement of Income. (b) Included in "other costs of operations" in the Consolidated Statement of Income. Accumulated other comprehensive income (loss), net consisted of the following: Defined Investment Cash Flow Benefit (Dollars in millions) Securities Hedges Plans Other Total Balance — December 31, 2023 $ ( 187 ) $ ( 151 ) $ ( 115 ) $ ( 6 ) $ ( 459 ) Net loss during period ( 10 ) ( 117 ) ( 1 ) ( 2 ) ( 130 ) Balance — March 31, 2024 $ ( 197 ) $ ( 268 ) $ ( 116 ) $ ( 8 ) $ ( 589 )

Derivative financial instrument

Derivative financial instruments	3 Months Ended
	Mar. 31, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative financial instruments	10. Derivative financial instruments As part of managing interest rate risk, the Company enters into interest rate swap agreements to modify the repricing characteristics of certain portions of the Company’s portfolios of earning assets and interest-bearing liabilities. The Company designates interest rate swap agreements utilized in the management of interest rate risk as either fair value hedges or cash flow hedges. Interest rate swap agreements are generally entered into with counterparties that meet established credit standards and most contain master netting, collateral and/or settlement provisions protecting the at-risk party. Based on adherence to the Company’s credit standards and the presence of the netting, collateral or settlement provisions, the Company believes that the credit risk inherent in these contracts was not material as of March 31, 2024. The net effect of interest rate swap agreements was to decrease net interest income by $ 100 million and $ 69 million during the three-month periods ended March 31, 2024 and 2023, respectively. Information about interest rate swap agreements entered into for interest rate risk management purposes summarized by type of financial instrument the swap agreements were intended to hedge follows: Average Weighted- Estimated Notional Maturity Average Rate Fair Value (Dollars in millions) Amount (In years) Fixed Variable Gain (Loss) (a) March 31, 2024 Fair value hedges: Fixed rate long-term borrowings (b) (c) $ 3,850 5.9 3.48 % 5.51 % $ — Cash flow hedges: Interest payments on variable rate commercial real estate 23,427 1.7 3.38 5.33 2 Total $ 27,277 2.3 $ 2 December 31, 2023 Fair value hedges: Fixed rate long-term borrowings (b) (e) $ 3,000 5.8 3.45 % 5.62 % $ ( 1 ) Cash flow hedges: Interest payments on variable rate commercial real estate 23,977 1.7 3.45 5.36 11 Total $ 26,977 2.2 $ 10 (a) Certain clearinghouse exchanges consider payments by counterparties for variation margin on derivative instruments to be settlements of those positions. The impact of such payments for interest rate swap agreements designated as fair value hedges was a net settlement of losses of $ 104 million at March 31, 2024 and $ 43 million at December 31, 2023. The impact of such payments on interest rate swap agreements designated as cash flow hedges was a net settlement of losses of $ 361 million at March 31, 2024 and $ 214 million at December 31, 2023. (b) Under the terms of these agreements, the Company receives settlement amounts at a fixed rate and pays at a variable rate. (c) Includes notional amount and terms of $ 1.8 billion of forward-starting interest rate swap agreements that become effective in 2025. (d) Includes notional amount and terms of $ 6.0 billion of forward-starting interest rate swap agreements that become effective in 2024 and 2025. (e) Includes notional amount and terms of $ 1.0 billion of forward-starting interest rate swap agreements that become effective in 2025. (f) Includes notional amount and terms of $ 9.0 billion of forward-starting interest rate swap agreements that become effective in 2024. The Company utilizes commitments to sell residential and commercial real estate loans to hedge the exposure to changes in the fair value of real estate loans held for sale. Such commitments have generally been designated as fair value hedges. The Company also utilizes commitments to sell real estate loans to offset the exposure to changes in the fair value of certain commitments to originate real estate loans for sale. Other derivative financial instruments not designated as hedging instruments included interest rate contracts, foreign exchange and other option and futures contracts. Interest rate contracts not designated as hedging instruments had notional values of $ 43.4 billion and $ 44.4 billion at March 31, 2024 and December 31, 2023 , respectively. The notional amounts of foreign exchange and other option and futures contracts not designated as hedging instruments aggregated $ 1.7 billion and $ 1.5 billion at March 31, 2024 and December 31, 2023, respectively. 10. Derivative financial instruments, continued Information about the fair values of derivative instruments in the Company’s Consolidated Balance Sheet and Consolidated Statement of Income follows: Asset Derivatives Liability Derivatives Fair Value Fair Value March 31, December 31, March 31, December 31, (Dollars in millions) 2024 2023 2024 2023 Derivatives designated and qualifying as hedging Interest rate swap agreements $ 3 $ 12 $ 1 $ 2 Commitments to sell real estate loans 11 6 1 8 14 18 2 10 Derivatives not designated and qualifying as hedging Mortgage banking: Commitments to originate real estate loans for sale 6 15 36 32 Commitments to sell real estate loans 40 35 2 3 46 50 38 35 Other: Interest rate contracts (b) 243 237 1,019 879 Foreign exchange and other option and futures contracts 15 19 13 19 258 256 1,032 898 Total derivatives $ 318 $ 324 $ 1,072 $ 943 (a) Asset derivatives are reported in "accrued interest and other assets" and liability derivatives are reported in "accrued interest and other liabilities" in the Consolidated Balance Sheet. (b) The impact of variation margin payments at March 31, 2024 and December 31, 2023 was a reduction of the estimated fair value of interest rate contracts not designated as hedging instruments in an asset position of $ 893 million and $ 783 million , respectively, as of each period end, and in a liability position of $ 16 million and $ 32 million , respectively. Amount of Gain (Loss) Recognized Three Months Ended March 31, 2024 2023 (Dollars in millions) Derivative Hedged Item Derivative Hedged Item Derivatives in fair value hedging relationships Interest rate swap agreements: Fixed rate long-term borrowings (a) $ ( 60 ) $ 60 $ 12 $ ( 12 ) Derivatives not designated as hedging instruments Interest rate contracts (b) $ 3 $ 8 Foreign exchange and other option and futures contracts (b) 4 4 Total $ 7 $ 12 (a) Reported as an adjustment to "interest expense" in the Consolidated Statement of Income. (b) Reported as "trading account and other non-hedging derivative gains" in the Consolidated Statement of Income. Carrying Amount of the Hedged Item Cumulative Amount of Fair Value Hedging Adjustment Increasing (Decreasing) the Carrying Amount of the Hedged Item (Dollars in millions) March 31, 2024 December 31, 2023 March 31, 2024 December 31, 2023 Location in the Consolidated Balance Sheet Hedges Long-term borrowings $ 3,742 $ 2,954 $ ( 104 ) $ ( 44 ) The amount of interest income recognized in the Consolidated Statement of Income associated with derivatives designated as cash flow hedges was a decrease of $ 87 million and $ 59 million for the three months ended March 31, 2024 and 2023, respectively. As of March 31, 2024, the unrealized net loss recognized in other comprehensive income related to cash flow hedges was $ 359 million , of which losses of $ 1 million, $ 227 million, $ 129 million and $ 2 million relate to interest rate swap agreements maturing in 2024, 2025, 2026 and 2027, respectively. 10. Derivative financial instruments, continued The Company does not offset derivative asset and liability positions in its consolidated financial statements. The Company’s exposure to credit risk by entering into derivative contracts is mitigated through master netting agreements and collateral posting or settlement requirements. Master netting agreements covering interest rate and foreign exchange contracts with the same party include a right to set-off that becomes enforceable in the event of default, early termination or under other specific conditions. The aggregate fair value of derivative financial instruments in a liability position, which are subject to enforceable master netting arrangements and the related collateral posted, was not material at each of March 31, 2024 and December 31, 2023. Certain of the Company’s derivative financial instruments contain provisions that require the Company to maintain specific credit ratings from credit rating agencies to avoid higher collateral posting requirements. If the Company’s debt ratings were to fall below specified ratings, the counterparties of the derivative financial instruments could demand immediate incremental collateralization on those instruments in a net liability position. The aggregate fair value of all derivative financial instruments with such credit risk-related contingent features in a net liability position on March 31, 2024 was not material. The aggregate fair value of derivative financial instruments in an asset position with counterparties, which are subject to enforceable master netting arrangements, was $ 232 million at March 31, 2024 and $ 179 million at December 31, 2023 . Counterparties posted collateral relating to those positions of $ 231 million at March 31, 2024 and $ 179 million at December 31, 2023, respectively. Interest rate swap agreements entered into with customers are subject to the Company’s credit risk standards and often contain collateral provisions. In addition to the derivative contracts noted above, the Company clears certain derivative transactions through a clearinghouse, rather than directly with counterparties. Those transactions cleared through a clearinghouse require initial margin collateral and variation margin payments depending on the contracts being in a net asset or liability position. The amount of initial margin collateral posted by the Company was $ 146 million and $ 129 million at March 31, 2024 and December 31, 2023 , respectively. The fair value asset and liability amounts of derivative contracts have been reduced by variation margin payments treated as settlements as described herein. Variation margin on derivative contracts not treated as settlements continues to represent collateral posted or received by the Company.

Variable interest entities and

Variable interest entities and asset securitizations	3 Months Ended
	Mar. 31, 2024
Text Block [Abstract]
Variable interest entities and asset securitizations	11. Variable interest entities and asset securitizations The Company’s securitization activity includes securitizing loans originated for sale into government issued or guaranteed mortgage-backed securities. The Company has no t recognized any material losses as a result of having securitized assets. In March 2024, M&T Bank issued asset-backed notes secured by automobile loans. Approximately $ 526 million of such loans were sold into a special purpose trust which in turn issued asset-backed notes to investors. The loans continue to be serviced by the Company. A total of $ 511 million of such notes, representing the senior-most notes in the securitization, were purchased by third parties. Those asset-backed notes had a weighted-average estimated life of approximately two years and a weighted-average interest rate of 5.29 % at the time of securitization. Additionally, $ 15 million of certificates representing the residual interests of the trust were retained by the Company. As a result of the retention of the residual interests and its continued role as servicer of the loans, the Company is considered to be the primary beneficiary of the securitization trust and, accordingly, the trust has been included in the Company's consolidated financial statements. 11. Variable interest entities and asset securitizations, continued M&T has issued junior subordinated debentures payable to various trusts that have issued preferred capital securities. M&T owns the common securities of those trust entities. The Company is not considered to be the primary beneficiary of those entities and, accordingly, the trusts are not included in the Company’s consolidated financial statements. At each of March 31, 2024 and December 31, 2023, the Company included the junior subordinated debentures as “long-term borrowings” in its Consolidated Balance Sheet and recognized $ 22 million in other assets for its “investment” in the common securities of the trusts that will be concomitantly repaid to M&T by the respective trust from the proceeds of M&T’s repayment of the junior subordinated debentures associated with preferred capital securities. The Company has invested as a limited partner in various partnerships that collectively had total assets of approximately $ 9.8 billion at each of March 31, 2024 and December 31, 2023 . Those partnerships generally construct or acquire properties, including properties and facilities that produce renewable energy, for which the investing partners are eligible to receive certain federal income tax credits in accordance with government guidelines. Such investments may also provide tax deductible losses to the partners. The partnership investments also assist the Company in achieving its community reinvestment initiatives. The Company, in its position as limited partner, does not direct the activities that most significantly impact the economic performance of the partnerships and, therefore, the partnership entities are not included in the Company's consolidated financial statements. The Company's investments in qualified affordable housing projects are accounted for using the proportional amortization method whereby those investments are amortized to "income taxes" in the Consolidated Statement of Income as tax credits and other tax benefits resulting from deductible losses associated with the projects are received. Effective January 1, 2024, the Company adopted amended guidance which permits an election to account for other tax equity investments using the proportional amortization method if certain conditions are met. The Company has elected to apply the proportional amortization method to eligible renewable energy and certain other tax credit investments in addition to the low income housing tax credit investments for which the proportional amortization method had previously been applied. Information on the Company’s carrying amount of its investments in tax equity partnerships and its related future funding commitments are presented in the following table: (Dollars in millions) March 31, 2024 December 31, 2023 Affordable housing projects: Carrying amount (a) $ 1,323 $ 1,340 Amount of future funding commitments included in carrying amount (b) 379 410 Contingent commitments 55 55 Renewable energy: Carrying amount (a) 79 80 Amount of future funding commitments included in carrying amount (b) 49 31 Other: Carrying amount (a) 40 41 Amount of future funding commitments included in carrying amount (b) — — (a) Included in "accrued interest and other assets" in the Consolidated Balance Sheet . (b) Included in "accrued interest and other liabilities" in the Consolidated Balance Sheet. 11. Variable interest entities and asset securitizations, continued The reduction to income tax expense recognized from the Company's investments in partnerships accounted for using the proportional amortization method was $ 7 million (net of $ 43 million of investment amortization) and $ 6 million (net of $ 41 million of investment amortization) for the three months ended March 31, 2024 and 2023, respectively. The net reduction to income tax expense has been reported in "net change in other accrued income and expense" in the Consolidated Statement of Cash Flows. While the Company has elected to apply the proportional amortization method for renewable energy credit investments, at March 31, 2024 no such investments met the eligibility criteria for application of that method. The reduction to income tax expense recognized from renewable energy credit investments was $ 11 million and $ 8 million for the three months ended March 31, 2024 and 2023, respectively. As a limited partner, there is no recourse to the Company by creditors of the partnerships. However, the tax credits that result from the Company’s investments in such partnerships are generally subject to recapture should a partnership fail to comply with the respective government regulations. The Company has not provided financial or other support to the partnerships that was not contractually required. Although the Company currently estimates that no material losses are probable, its maximum exposure to loss from its investments in such partnerships as of March 31, 2024 was $ 2.2 billion, including possible recapture of certain tax credits. The Company serves as investment advisor for certain registered money-market funds. The Company has no explicit arrangement to provide support to those funds, but may waive portions of its allowable management fees as a result of market conditions.

Fair value measurements

Fair value measurements	3 Months Ended
	Mar. 31, 2024
Fair Value Disclosures [Abstract]
Fair value measurements	12. Fair value measurements GAAP permits an entity to choose to measure eligible financial instruments and other items at fair value. The Company has not made any fair value elections at March 31, 2024. Pursuant to GAAP, fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. A three-level hierarchy exists in GAAP for fair value measurements based upon the inputs to the valuation of an asset or liability. • Level 1 — Valuation is based on quoted prices in active markets for identical assets and liabilities. • Level 2 — Valuation is determined from quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar instruments in markets that are not active or by model-based techniques in which all significant inputs are observable in the market. • Level 3 — Valuation is derived from model-based and other techniques in which at least one significant input is unobservable and which may be based on the Company's own estimates about the assumptions that market participants would use to value the asset or liability. When available, the Company attempts to use quoted market prices in active markets to determine fair value and classifies such items as Level 1 or Level 2. If quoted market prices in active markets are not available, fair value is often determined using model-based techniques incorporating various assumptions including interest rates, prepayment speeds and credit losses. Assets and liabilities valued using model-based techniques are classified as either Level 2 or Level 3, depending on the lowest level classification of an input that is considered significant to the overall valuation. The following is a description of the valuation methodologies used for the Company's assets and liabilities that are measured on a recurring basis at estimated fair value. 12. Fair value measurements, continued Trading account Mutual funds held in connection with deferred compensation and other arrangements have been classified as Level 1 valuations. Valuations of investments in debt securities can generally be obtained through reference to quoted prices in less active markets for the same or similar securities or through model-based techniques in which all significant inputs are observable and, therefore, such valuations have been classified as Level 2. Available-for-sale investment securities and equity securities The majority of the Company's available-for-sale investment securities have been valued by reference to prices for similar securities or through model-based techniques in which all significant inputs are observable and, therefore, such valuations have been classified as Level 2. Certain investments in mutual funds and equity securities are actively traded and, therefore, have been classified as Level 1 valuations. Real estate loans held for sale The Company utilizes commitments to sell real estate loans to hedge the exposure to changes in fair value of real estate loans held for sale. The carrying value of hedged real estate loans held for sale includes changes in estimated fair value during the hedge period. Typically, the Company attempts to hedge real estate loans held for sale from the date of close through the sale date. The fair value of hedged real estate loans held for sale is generally calculated by reference to quoted prices in secondary markets for commitments to sell real estate loans with similar characteristics and, accordingly, such loans have been classified as a Level 2 valuation. Commitments to originate real estate loans for sale and commitments to sell real estate loans The Company enters into various commitments to originate real estate loans for sale and commitments to sell real estate loans. Such commitments are accounted for as derivative financial instruments and, therefore, are carried at estimated fair value on the Consolidated Balance Sheet. The estimated fair values of such commitments were generally calculated by reference to quoted prices in secondary markets for commitments to sell real estate loans to certain government-sponsored entities and other parties. The fair valuations of commitments to sell real estate loans generally result in a Level 2 classification. The estimated fair value of commitments to originate real estate loans for sale are adjusted to reflect the Company's anticipated commitment expirations. The estimated commitment expirations are considered significant unobservable inputs contributing to the Level 3 classification of commitments to originate real estate loans for sale. Significant unobservable inputs used in the determination of estimated fair value of commitments to originate real estate loans for sale are included in the accompanying table of significant unobservable inputs to Level 3 measurements. Interest rate swap agreements used for interest rate risk management The Company utilizes interest rate swap agreements as part of the management of interest rate risk to modify the repricing characteristics of certain portions of its portfolios of earning assets and interest-bearing liabilities. The Company generally determines the fair value of its interest rate swap agreements using externally developed pricing models based on market observable inputs and, therefore, classifies such valuations as Level 2. The Company has considered counterparty credit risk in the valuation of its interest rate swap agreement assets and has considered its own credit risk in the valuation of its interest rate swap agreement liabilities. Other non-hedging derivatives Other non-hedging derivatives consist primarily of interest rate contracts and foreign exchange contracts with customers who require such services with offsetting positions with third parties to minimize the Company's risk with respect to such transactions. The Company generally determines the fair value of its other non-hedging derivative assets and liabilities using externally developed pricing models based on market observable inputs and, therefore, classifies such valuations as Level 2. 12. Fair value measurements, continued The following tables present assets and liabilities at March 31, 2024 and December 31, 2023 measured at estimated fair value on a recurring basis: (Dollars in millions) Fair Value Measurements Level 1 Level 2 Level 3 (a) March 31, 2024 Trading account $ 99 $ 99 $ — $ — Investment securities available for sale: U.S. Treasury and federal agencies 7,719 — 7,719 — Mortgage-backed securities: Government issued or guaranteed Commercial 1,343 — 1,343 — Residential 2,910 — 2,910 — Other debt securities 162 — 162 — 12,134 — 12,134 — Equity securities 356 343 13 — Real estate loans held for sale 728 — 728 — Other assets (b) 318 — 312 6 Total assets $ 13,635 $ 442 $ 13,187 $ 6 Other liabilities (b) $ 1,072 $ — $ 1,036 $ 36 Total liabilities $ 1,072 $ — $ 1,036 $ 36 December 31, 2023 Trading account $ 106 $ 101 $ 5 $ — Investment securities available for sale: U.S. Treasury and federal agencies 7,705 — 7,705 — Mortgage-backed securities: Government issued or guaranteed Commercial 416 — 416 — Residential 2,154 — 2,154 — Other debt securities 165 — 165 — 10,440 — 10,440 — Equity securities 268 258 10 — Real estate loans held for sale 379 — 379 — Other assets (b) 324 — 309 15 Total assets $ 11,517 $ 359 $ 11,143 $ 15 Other liabilities (b) $ 943 $ — $ 911 $ 32 Total liabilities $ 943 $ — $ 911 $ 32 (a) Significant unobservable inputs used in the fair value measurement of commitments to originate real estate loans held for sale included weighted-average commitment expirations of 8 % at March 31, 2024 and 5 % at December 31, 2023. An increase (decrease) in the estimate of expirations for commitments to originate real estate loans would generally result in a lower (higher) fair value measurement. Estimated commitment expirations are derived considering loan type, changes in interest rates and remaining length of time until closing. (b) Comprised predominantly of interest rate swap agreements used for interest rate risk management (Level 2), interest rate and foreign exchange contracts not designated as hedging instruments (Level 2), commitments to sell real estate loans (Level 2) and commitments to originate real estate loans to be held for sale (Level 3). 12. Fair value measurements, continued The Company is required, on a nonrecurring basis, to adjust the carrying value of certain assets or provide valuation allowances related to certain assets using fair value measurements. The more significant of those assets follow. Loans Loans are generally not recorded at fair value on a recurring basis. Periodically, the Company records nonrecurring adjustments to the carrying value of loans based on fair value measurements for partial charge-offs of the uncollectable portions of those loans. Nonrecurring adjustments also include certain impairment amounts for collateral-dependent loans when establishing the allowance for credit losses. Such amounts are generally based on the fair value of the underlying collateral supporting the loan and, as a result, the carrying value of the loan less the calculated valuation amount does not necessarily represent the fair value of the loan. Real estate collateral is typically valued using appraisals or other indications of value based on recent comparable sales of similar properties or assumptions generally observable in the marketplace and the related nonrecurring fair value measurement adjustments have been classified as Level 2, unless significant adjustments have been made to the valuation that are not readily observable by market participants. Non-real estate collateral supporting commercial and industrial loans generally consists of business assets such as receivables, inventory and equipment. Fair value estimations are typically determined by discounting recorded values of those assets to reflect estimated net realizable value considering specific borrower facts and circumstances and the experience of credit personnel in their dealings with similar borrower collateral liquidations. Such discounts were in the range of 10 % to 90 % with a weighted-average of 38 % at March 31, 2024. As these discounts are not readily observable and are considered significant, the valuations have been classified as Level 3. Automobile collateral is typically valued by reference to independent pricing sources based on recent sales transactions of similar vehicles and, accordingly, the related nonrecurring fair value measurement adjustments have been classified as Level 2. Collateral values for other consumer installment loans are generally estimated based on historical recovery rates for similar types of loans which at March 31, 2024 was 46 %. As these recovery rates are not readily observable by market participants, such valuation adjustments have been classified as Level 3. Loans subject to nonrecurring fair value measurement were $ 1.0 billion at March 31, 2024 ($ 312 million and $ 707 million of which were classified as Level 2 and Level 3, respectively), $ 923 million at December 31, 2023 ($ 234 million and $ 689 million of which were classified as Level 2 and Level 3, respectively) and $ 670 million at March 31, 2023 ($ 374 million and $ 296 million of which were classified as Level 2 and Level 3, respectively). Changes in the fair value recognized for partial charge-offs of loans and loan impairment reserves on loans held by the Company on March 31, 2024 and 2023 were decreases of $ 175 million and $ 69 million for the three-month periods ended March 31, 2024 and 2023, respectively. Assets taken in foreclosure of defaulted loans Assets taken in foreclosure of defaulted loans are primarily comprised of commercial and residential real property and are generally measured at the lower of cost or fair value less costs to sell. The fair value of the real property is generally determined using appraisals or other indications of value based on recent comparable sales of similar properties or assumptions generally observable in the marketplace and the related nonrecurring fair value measurement adjustments have generally been classified as Level 2. Assets taken into foreclosure of defaulted loans subject to nonrecurring fair value measurement were not material at each of March 31, 2024 and 2023. Changes in fair value recognized for those foreclosed assets held by the Company were not material during the three-month periods ended March 31, 2024 and 2023. 12. Fair value measurements, continued Capitalized servicing rights Capitalized servicing rights are initially measured at fair value in the Company’s Consolidated Balance Sheet. The Company utilizes the amortization method to subsequently measure its capitalized servicing assets. In accordance with GAAP, the Company must record impairment charges, on a nonrecurring basis, when the carrying value of certain strata exceed their estimated fair value. To estimate the fair value of servicing rights, the Company considers market prices for similar assets, if available, and the present value of expected future cash flows associated with the servicing rights calculated using assumptions that market participants would use in estimating future servicing income and expense. Such assumptions include estimates of the cost of servicing loans, loan default rates, an appropriate discount rate and prepayment speeds. For purposes of evaluating and measuring impairment of capitalized servicing rights, the Company stratifies such assets based on the predominant risk characteristics of the underlying financial instruments that are expected to have the most impact on projected prepayments, cost of servicing and other factors affecting future cash flows associated with the servicing rights. Such factors may include financial asset or loan type, note rate and term. The amount of impairment recognized is the amount by which the carrying value of the capitalized servicing rights for a stratum exceed estimated fair value. Impairment is recognized through a valuation allowance. The determination of fair value of capitalized servicing rights is considered a Level 3 valuation. Capitalized servicing rights related to residential mortgage loans required no valuation allowance at each of March 31, 2024, December 31, 2023 and March 31, 2023. Disclosures of fair value of financial instruments The carrying amounts and estimated fair value for certain financial instruments that are not recorded at fair value in the Consolidated Balance Sheet are presented in the following tables: (Dollars in millions) Carrying Estimated Level 1 Level 2 Level 3 March 31, 2024 Financial assets: Cash and cash equivalents $ 1,695 $ 1,695 $ 1,396 $ 299 $ — Interest-bearing deposits at banks 32,144 32,144 — 32,144 — Investment securities held to maturity 15,078 13,865 — 13,821 44 Loans and leases, net 132,782 129,771 — 7,354 122,417 Financial liabilities: Time deposits 20,279 20,236 — 20,236 — Short-term borrowings 4,795 4,795 — 4,795 — Long-term borrowings 11,450 11,370 — 11,370 — December 31, 2023 Financial assets: Cash and cash equivalents 1,731 1,731 1,668 63 — Interest-bearing deposits at banks 28,069 28,069 — 28,069 — Investment securities held to maturity 15,330 14,308 — 14,262 46 Loans and leases, net 131,939 129,138 — 7,240 121,898 Financial liabilities: Time deposits 20,759 20,715 — 20,715 — Short-term borrowings 5,316 5,316 — 5,316 — Long-term borrowings 8,201 8,107 — 8,107 — 12. Fair value measurements, continued With the exception of marketable securities and mortgage loans originated for sale, the Company's financial instruments presented in the preceding tables are not readily marketable and market prices do not exist. The Company, in attempting to comply with the provisions of GAAP that require disclosures of fair value of financial instruments, has not attempted to market its financial instruments to potential buyers, if any exist. Since negotiated prices in illiquid markets depend greatly upon the then present motivations of the buyer and seller, it is reasonable to assume that actual sales prices could vary widely from any estimate of fair value made without the benefit of negotiations. Additionally, changes in market interest rates can dramatically impact the value of financial instruments in a short period of time. The Company does not believe that the estimated information presented herein is representative of the earnings power or value of the Company. The preceding analysis, which is inherently limited in depicting fair value, also does not consider any value associated with existing customer relationships nor the ability of the Company to create value through loan origination, deposit gathering or fee generating activities. Many of the estimates presented herein are based upon the use of highly subjective information and assumptions and, accordingly, the results may not be precise. Management believes that fair value estimates may not be comparable between financial institutions due to the wide range of permitted valuation techniques and numerous estimates which must be made. Furthermore, because the disclosed fair value amounts were estimated as of the balance sheet date, the amounts actually realized or paid upon maturity or settlement of the various financial instruments could be significantly different.

Commitments and contingencies

Commitments and contingencies	3 Months Ended
	Mar. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Commitments and contingencies	13. Commitments and contingencies In the normal course of business, various commitments and contingent liabilities are outstanding. The following table presents the Company's significant commitments. Certain of these commitments are not included in the Company's Consolidated Balance Sheet. March 31, December 31, (Dollars in millions) 2024 2023 Commitments to extend credit: Commercial and industrial $ 28,439 $ 28,566 Commercial real estate loans to be sold 451 916 Other commercial real estate 4,413 5,019 Residential real estate loans to be sold 211 163 Other residential real estate 393 331 Home equity lines of credit 8,080 8,109 Credit cards 5,651 5,578 Other 389 413 Standby letters of credit 2,230 2,289 Commercial letters of credit 56 62 Financial guarantees and indemnification contracts 4,129 4,036 Commitments to sell real estate loans 1,329 1,400 Commitments to extend credit are agreements to lend to customers, generally having fixed expiration dates or other termination clauses that may require payment of a fee. In addition to the amounts in the preceding table, the Company had discretionary funding commitments to commercial customers of $ 12.4 billion and $ 12.3 billion at March 31, 2024 and December 31, 2023, respectively, that the Company had the unconditional right to cancel prior to funding. Standby and commercial letters of credit are conditional commitments issued to guarantee the performance of a customer to a third party. Standby letters of credit generally are contingent upon the failure of the customer to perform according to the terms of the underlying contract with the third party, whereas commercial letters of credit are issued to facilitate commerce and typically result in the commitment being funded when the underlying transaction is consummated between the customer and a third party. The credit risk associated with commitments to extend credit and standby and commercial letters of credit is essentially the same as that involved with extending loans to customers and is subject to normal credit policies. Collateral may be obtained based on management's assessment of the customer's creditworthiness. 13. Commitments and contingencies, continued Financial guarantees and indemnification contracts are predominantly comprised of recourse obligations associated with sold loans and other guarantees and commitments. Included in financial guarantees and indemnification contracts are loan principal amounts sold with recourse in conjunction with the Company's involvement in the Fannie Mae DUS program. The Company's maximum credit risk for recourse associated with loans sold under this program totaled approximately $ 4.0 billion and $ 3.9 billion at March 31, 2024 and December 31, 2023, respectively. At March 31, 2024, the Company estimated that the recourse obligations described above were not material to the Company's consolidated financial position. There have been no material losses incurred as a result of those credit recourse arrangements. Since many loan commitments, standby letters of credit, and guarantees and indemnification contracts expire without being funded in whole or in part, the contract amounts are not necessarily indicative of future cash flows. The Company utilizes commitments to sell real estate loans to hedge exposure to changes in the fair value of real estate loans held for sale. Such commitments are accounted for as derivatives and along with commitments to originate real estate loans to be held for sale are recorded in the Consolidated Balance Sheet at estimated fair market value. The Company is contractually obligated to repurchase previously sold residential real estate loans that do not ultimately meet investor sale criteria related to underwriting procedures or loan documentation. When required to do so, the Company may reimburse loan purchasers for losses incurred or may repurchase certain loans. The Company reduces residential mortgage banking revenues by an estimate for losses related to its obligations to loan purchasers. The amount of those charges is based on the volume of loans sold, the level of reimbursement requests received from loan purchasers and estimates of losses that may be associated with previously sold loans. At March 31, 2024, the Company's estimated obligation to loan purchasers was not material to the Company’s consolidated financial position. M&T and its subsidiaries are subject in the normal course of business to various pending and threatened legal proceedings and other matters in which claims for monetary damages are asserted. On an on-going basis management, after consultation with legal counsel, assesses the Company’s liabilities and contingencies in connection with such proceedings. For those matters where it is probable that the Company will incur losses and the amounts of the losses can be reasonably estimated, the Company records an expense and corresponding liability in its consolidated financial statements. To the extent pending or threatened litigation could result in exposure in excess of that liability, the amount of such excess is not currently estimable. Although not considered probable, the range of reasonably possible losses for such matters in the aggregate, beyond the existing recorded liability, was between $ 0 and $ 25 million as of March 31, 2024. Although the Company does not believe that the outcome of pending legal matters will be material to the Company’s consolidated financial position, it cannot rule out the possibility that such outcomes will be material to the consolidated results of operations for a particular reporting period in the future. In February 2024, the FDIC notified member banks that the loss estimate attributable to certain failed banks in 2023 was approximately $ 20.4 billion, an increase of approximately $ 4.1 billion from the estimate of $ 16.3 billion described in the final rule. The FDIC also indicated that through the receivership of one of the failed banks, it had estimated residual interests in securities that were sold into trusts that could potentially reduce that loss estimate in the amount of $ 1.7 billion. The FDIC is expected to provide an updated estimate of the Company's special assessment amount with its first quarter 2024 invoice, which is anticipated to be received in June 2024. Reflecting the update to the loss estimate and related residual interest, the Company recorded an expense of $ 29 million i n the Consolidated Statement of Income in the first quarter of 2024 in addition to the $ 197 million recorded in the fourth quarter of 2023, resulting in an accrued liability recorded in "accrued interest and other liabilities" in the Company's Consolidated Balance Sheet of $ 226 million at March 31, 2024 and $ 197 million at December 31, 2023. The FDIC has indicated that the amount of the special assessment will be adjusted as its loss estimates change.

Segment information

Segment information	3 Months Ended
	Mar. 31, 2024
Segment Reporting [Abstract]
Segment information	14. Segment information Reportable segments have been determined based upon the Company's organizational structure and its internal profitability reporting system, which is organized by strategic business unit. The 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 23 of Notes to Financial Statements in the 2023 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, the financial information of the reported segments is 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 follows: Three Months Ended March 31, 2024 2023 (Dollars in millions) Total Revenues(a) Inter- Net Total Average Assets Total Revenues(a) Inter- Net Total Average Assets Commercial Bank $ 699 $ 2 $ 201 $ 81,083 $ 811 $ 2 $ 333 $ 79,034 Retail Bank 1,268 — 446 52,232 1,234 — 452 51,293 Institutional Services and Wealth 377 3 128 3,636 390 3 110 3,655 All Other ( 84 ) ( 5 ) ( 244 ) 74,527 ( 30 ) ( 5 ) ( 193 ) 68,617 Total $ 2,260 $ — $ 531 $ 211,478 $ 2,405 $ — $ 702 $ 202,599 (a) Total revenues are comprised of net interest income and other income. Net interest income is the difference between taxable-equivalent interest earned on assets and interest paid on liabilities owed by a segment and a funding charge (credit) based on the Company's internal funds transfer and allocation 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 $ 12 million and $ 14 million for the three-month periods ended March 31, 2024 and 2023 and is eliminated in "All Other" total revenues.

Relationship with BLG and Bayvi

Relationship with BLG and Bayview Financial	3 Months Ended
	Mar. 31, 2024
Text Block [Abstract]
Relationship with BLG and Bayview Financial	15. Relationship with BLG and Bayview Financial M&T holds a 20 % minority interest in BLG, a privately-held commercial mortgage company. That investment had no remaining carrying value at March 31, 2024 as a result of cumulative losses recognized and cash distributions received in prior years. Cash distributions now received from BLG are recognized as income by M&T and included in "other revenues from operations" in the Consolidated Statement of Income. That income totaled $ 25 million and $ 20 million for the three-month periods ended March 31, 2024 and 2023, respectively. Bayview Financial, a privately-held specialty finance company, is BLG's majority investor. In addition to their common investment in BLG, the Company and Bayview Financial conduct other business activities with each other. The Company has obtained loan servicing rights for mortgage loans from BLG and Bayview Financial having outstanding principal balances of $ 1.1 billion and $ 1.2 billion at March 31, 2024 and December 31, 2023 , respectively. Revenues from those servicing rights were $ 1 million and $ 2 million in the three-month periods ended March 31, 2024 and 2023 , respectively. The Company sub-services residential mortgage loans for Bayview Financial having outstanding principal balances of $ 112.0 billion and $ 115.3 billion at March 31, 2024 and December 31, 2023 , respectively. Revenues earned for sub-servicing loans for Bayview Financial were $ 32 million in each of the three-month periods ended March 31, 2024 and 2023 . In addition, the Company held $ 41 million and $ 42 million of mortgage-backed securities in its held-to-maturity portfolio at March 31, 2024 and December 31, 2023, respectively, that were securitized by Bayview Financial. At March 31, 2024 , the Company held $ 674 million of Bayview Financial's $ 3.7 billion syndicated loan facility.

Significant accounting polici_2

Significant accounting policies (Policies)	3 Months Ended
	Mar. 31, 2024
Accounting Policies [Abstract]
Basis of Accounting	The consolidated interim financial statements of the Company were compiled in accordance with GAAP using the accounting policies set forth in note 1 of Notes to Financial Statements included in the 2023 Annual Report, except as described in the following table. The financial statements contain all adjustments which are, in the opinion of management, necessary for a fair statement of the Company's financial position, results of operations and cash flows for the interim periods presented.
Recent accounting developments	Recent accounting developments Standard Description Required date of adoption Effect on consolidated financial statements Standards Adopted in 2024 Accounting for Investments in Tax Credit Structures Using the Proportional Amortization Method The amendments permit an election to account for tax equity investments, regardless of the tax credit program from which the income tax credits are received, using the proportional amortization method if certain conditions are met. Under the proportional amortization method, the initial cost of the investment is amortized in proportion to the income tax credits and other income tax benefits received and the net amortization and income tax credits and other income tax benefits are recognized in the income statement as a component of income tax expense (benefit). January 1, 2024 As described in note 11, the Company adopted the amended guidance effective January 1, 2024 using a modified retrospective transition. The guidance did not have a material impact on the Company’s consolidated financial statements.

Investment securities (Tables)

Investment securities (Tables)	3 Months Ended
	Mar. 31, 2024
Investments, Debt and Equity Securities [Abstract]
Amortized Cost and Estimated Fair Value of Investment Securities	The amortized cost and estimated fair value of investment securities were as follows: (Dollars in millions) Amortized Gross Gross Estimated March 31, 2024 Investment securities available for sale: U.S. Treasury and federal agencies $ 7,818 $ — $ 99 $ 7,719 Mortgage-backed securities: Government issued or guaranteed: Commercial 1,355 1 13 1,343 Residential 3,053 — 143 2,910 Other debt securities 171 — 9 162 12,397 1 264 12,134 Investment securities held to maturity: U.S. Treasury and federal agencies 1,007 — 33 974 Obligations of states and political subdivisions 2,466 — 94 2,372 Mortgage-backed securities: Government issued or guaranteed: Commercial 2,035 — 154 1,881 Residential 9,527 — 935 8,592 Privately issued 41 9 6 44 Other debt securities 2 — — 2 15,078 9 1,222 13,865 Total debt securities $ 27,475 $ 10 $ 1,486 $ 25,999 Equity and other securities: Readily marketable equity — at fair value $ 351 $ 8 $ 3 $ 356 Other — at cost 928 — — 928 Total equity and other securities $ 1,279 $ 8 $ 3 $ 1,284 December 31, 2023 Investment securities available for sale: U.S. Treasury and federal agencies $ 7,818 $ — $ 113 $ 7,705 Mortgage-backed securities: Government issued or guaranteed: Commercial 425 — 9 416 Residential 2,272 — 118 2,154 Other debt securities 176 — 11 165 10,691 — 251 10,440 Investment securities held to maturity: U.S. Treasury and federal agencies 1,005 — 31 974 Obligations of states and political subdivisions 2,501 — 67 2,434 Mortgage-backed securities: Government issued or guaranteed: Commercial 2,033 — 130 1,903 Residential 9,747 4 802 8,949 Privately issued 42 9 5 46 Other debt securities 2 — — 2 15,330 13 1,035 14,308 Total debt securities $ 26,021 $ 13 $ 1,286 $ 24,748 Equity and other securities: Readily marketable equity — at fair value $ 266 $ 5 $ 3 $ 268 Other — at cost 859 — — 859 Total equity and other securities $ 1,125 $ 5 $ 3 $ 1,127
Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity	At March 31, 2024, the amortized cost and estimated fair value of debt securities by contractual maturity were as follows: (Dollars in millions) Amortized Estimated Debt securities available for sale: Due in one year or less $ 3,248 $ 3,209 Due after one year through five years 4,691 4,628 Due after five years through ten years 50 44 Due after ten years — — 7,989 7,881 Mortgage-backed securities 4,408 4,253 $ 12,397 $ 12,134 Debt securities held to maturity: Due in one year or less $ 588 $ 575 Due after one year through five years 635 611 Due after five years through ten years 1,369 1,333 Due after ten years 883 829 3,475 3,348 Mortgage-backed securities 11,603 10,517 $ 15,078 $ 13,865
Investment Securities in Continuous Unrealized Loss Position	A summary of investment securities that as of March 31, 2024 and December 31, 2023 had been in a continuous unrealized loss position for less than twelve months and those that had been in a continuous unrealized loss position for twelve months or longer follows: Less Than 12 Months 12 Months or More (Dollars in millions) Fair Unrealized Fair Unrealized March 31, 2024 Investment securities available for sale: U.S. Treasury and federal agencies $ 2,242 $ 10 $ 5,177 $ 89 Mortgage-backed securities: Government issued or guaranteed: Commercial 765 6 393 7 Residential 813 6 1,964 137 Other debt securities — — 156 9 3,820 22 7,690 242 Investment securities held to maturity: U.S. Treasury and federal agencies 49 1 925 32 Obligations of states and political subdivisions 43 — 2,284 94 Mortgage-backed securities: Government issued or guaranteed: Commercial 172 9 1,709 145 Residential 1,133 12 7,459 923 Privately issued — — 33 6 1,397 22 12,410 1,200 Total $ 5,217 $ 44 $ 20,100 $ 1,442 December 31, 2023 Investment securities available for sale: U.S. Treasury and federal agencies $ 229 $ 1 $ 7,474 $ 112 Mortgage-backed securities: Government issued or guaranteed: Commercial 74 1 330 8 Residential 151 2 1,959 116 Other debt securities 6 — 154 11 460 4 9,917 247 Investment securities held to maturity: U.S. Treasury and federal agencies 50 — 924 31 Obligations of states and political subdivisions 218 3 2,172 64 Mortgage-backed securities: Government issued or guaranteed: Commercial 328 9 1,575 121 Residential 955 11 7,139 791 Privately issued — — 34 5 1,551 23 11,844 1,012 Total $ 2,011 $ 27 $ 21,761 $ 1,259

Loans and leases and the allo_2

Loans and leases and the allowance for credit losses (Tables)	3 Months Ended
	Mar. 31, 2024
Receivables [Abstract]
Summary of Current, Past Due and Nonaccrual Loans	A summary of current, past due and nonaccrual loans as of March 31, 2024 and December 31, 2023 follows: (Dollars in millions) Current 30-89 Days Accruing Past Nonaccrual Total March 31, 2024 Commercial and industrial $ 56,803 $ 219 $ 11 $ 864 $ 57,897 Real estate: Commercial (a) 24,119 163 31 855 25,168 Residential builder and developer 984 48 — 3 1,035 Other commercial construction 5,915 155 2 141 6,213 Residential (b) 21,118 627 245 202 22,192 Residential — limited documentation 801 30 — 53 884 Consumer: Home equity lines and loans 4,437 34 — 87 4,558 Recreational finance 10,553 71 — 30 10,654 Automobile 4,252 43 — 13 4,308 Other 1,982 20 8 54 2,064 Total $ 130,964 $ 1,410 $ 297 $ 2,302 $ 134,973 December 31, 2023 Commercial and industrial $ 56,091 $ 238 $ 11 $ 670 $ 57,010 Real estate: Commercial (a) 24,072 311 25 869 25,277 Residential builder and developer 1,065 5 — 3 1,073 Other commercial construction 6,322 159 1 171 6,653 Residential (b) 21,080 763 295 215 22,353 Residential — limited documentation 825 31 — 55 911 Consumer: Home equity lines and loans 4,528 40 — 81 4,649 Recreational finance 9,935 87 — 36 10,058 Automobile 3,918 60 — 14 3,992 Other 2,003 30 7 52 2,092 Total $ 129,839 $ 1,724 $ 339 $ 2,166 $ 134,068 (a) Commercial real estate loans held for sale were $ 563 million at March 31, 2024 and $ 189 million at December 31, 2023. (b) One-to-four family residential mortgage loans held for sale were $ 165 million at March 31, 2024 and $ 190 million at December 31, 2023 .
Summary of Loan grades applied various classes of Commercial and Industrial Loans and Commercial Real Estate Loans	The following table summarizes the loan grades applied at March 31, 2024 to the various classes of the Company’s commercial and industrial loans and commercial real estate loans and gross charge-offs for those types of loans for the three-month period ended March 31, 2024 by origination year. Term Loans by Origination Year Revolving Revolving Loans Converted to Term (Dollars in millions) 2024 2023 2022 2021 2020 Prior Loans Loans Total Commercial and industrial: Pass $ 2,012 $ 8,129 $ 7,567 $ 4,441 $ 2,099 $ 6,456 $ 22,719 $ 74 $ 53,497 Criticized accrual 32 306 422 277 117 602 1,745 35 3,536 Criticized nonaccrual 2 54 89 62 71 206 364 16 864 Total commercial and industrial $ 2,046 $ 8,489 $ 8,078 $ 4,780 $ 2,287 $ 7,264 $ 24,828 $ 125 $ 57,897 Gross charge-offs $ — $ 7 $ 9 $ 4 $ 3 $ 5 $ 50 $ — $ 78 Real estate: Commercial: Pass $ 696 $ 1,783 $ 1,652 $ 1,331 $ 2,013 $ 11,278 $ 435 $ — $ 19,188 Criticized accrual — 273 815 464 558 3,008 7 — 5,125 Criticized nonaccrual — — 46 11 101 695 2 — 855 Total commercial real estate $ 696 $ 2,056 $ 2,513 $ 1,806 $ 2,672 $ 14,981 $ 444 $ — $ 25,168 Gross charge-offs $ — $ — $ — $ — $ — $ 13 $ — $ — $ 13 Residential builder and Pass $ 89 $ 509 $ 187 $ 34 $ 5 $ 14 $ 102 $ — $ 940 Criticized accrual — 2 21 21 — 46 2 — 92 Criticized nonaccrual — — — 2 — 1 — — 3 Total residential builder $ 89 $ 511 $ 208 $ 57 $ 5 $ 61 $ 104 $ — $ 1,035 Gross charge-offs $ — $ — $ — $ — $ — $ 1 $ — $ — $ 1 Other commercial construction: Pass $ 27 $ 990 $ 1,231 $ 590 $ 273 $ 589 $ 45 $ — $ 3,745 Criticized accrual — 75 538 460 567 687 — — 2,327 Criticized nonaccrual — — 11 10 45 75 — — 141 Total other commercial $ 27 $ 1,065 $ 1,780 $ 1,060 $ 885 $ 1,351 $ 45 $ — $ 6,213 Gross charge-offs $ — $ — $ 2 $ — $ — $ 7 $ 2 $ — $ 11 The following table summarizes the loan grades applied at December 31, 2023 to the various classes of the Company’s commercial and industrial loans and commercial real estate loans by origination year. Term Loans by Origination Year Revolving Revolving Loans Converted to Term (Dollars in millions) 2023 2022 2021 2020 2019 Prior Loans Loans Total Commercial and industrial: Pass $ 8,689 $ 8,087 $ 4,800 $ 2,248 $ 2,169 $ 4,843 $ 22,345 $ 70 $ 53,251 Criticized accrual 292 279 277 142 127 481 1,460 31 3,089 Criticized nonaccrual 29 68 56 75 36 150 243 13 670 Total commercial and industrial $ 9,010 $ 8,434 $ 5,133 $ 2,465 $ 2,332 $ 5,474 $ 24,048 $ 114 $ 57,010 Real estate: Commercial: Pass $ 2,048 $ 1,742 $ 1,367 $ 2,011 $ 3,059 $ 8,491 $ 440 $ — $ 19,158 Criticized accrual 227 891 465 456 966 2,238 7 — 5,250 Criticized nonaccrual — 46 3 113 93 611 3 — 869 Total commercial real estate $ 2,275 $ 2,679 $ 1,835 $ 2,580 $ 4,118 $ 11,340 $ 450 $ — $ 25,277 Residential builder and Pass $ 530 $ 252 $ 41 $ 6 $ 2 $ 12 $ 116 $ — $ 959 Criticized accrual 1 18 30 — 59 — 3 — 111 Criticized nonaccrual — — 3 — — — — — 3 Total residential builder $ 531 $ 270 $ 74 $ 6 $ 61 $ 12 $ 119 $ — $ 1,073 Other commercial construction: Pass $ 813 $ 1,366 $ 651 $ 373 $ 646 $ 187 $ 30 $ — $ 4,066 Criticized accrual 53 391 390 691 565 326 — — 2,416 Criticized nonaccrual — 14 10 46 50 49 2 — 171 Total other commercial $ 866 $ 1,771 $ 1,051 $ 1,110 $ 1,261 $ 562 $ 32 $ — $ 6,653
Summary of loans in Accrual and Nonaccrual Status	A summary of loans in accrual and nonaccrual status at March 31, 2024 for the various classes of the Company’s residential real estate loans and consumer loans and gross charge-offs for those types of loans for the three-month period ended March 31, 2024 by origination year follows: Term Loans by Origination Year Revolving Revolving Loans Converted to Term (Dollars in millions) 2024 2023 2022 2021 2020 Prior Loans Loans Total Residential: Current $ 478 $ 1,499 $ 4,667 $ 3,717 $ 2,533 $ 8,131 $ 93 $ — $ 21,118 30-89 days past due — 6 107 62 30 422 — — 627 Accruing loans past due — 2 21 19 15 188 — — 245 Nonaccrual — 1 15 10 2 173 1 — 202 Total residential $ 478 $ 1,508 $ 4,810 $ 3,808 $ 2,580 $ 8,914 $ 94 $ — $ 22,192 Gross charge-offs $ — $ — $ — $ — $ — $ 1 $ — $ — $ 1 Residential - limited documentation: Current $ — $ — $ — $ — $ — $ 801 $ — $ — $ 801 30-89 days past due — — — — — 30 — — 30 Accruing loans past due — — — — — — — — — Nonaccrual — — — — — 53 — — 53 Total residential - limited $ — $ — $ — $ — $ — $ 884 $ — $ — $ 884 Gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — $ — Consumer: Home equity lines and loans: Current $ — $ — $ — $ 2 $ 2 $ 105 $ 2,972 $ 1,356 $ 4,437 30-89 days past due — — — — — 3 — 31 34 Accruing loans past due — — — — — — — — — Nonaccrual — — — — — 5 1 81 87 Total home equity lines and loans $ — $ — $ — $ 2 $ 2 $ 113 $ 2,973 $ 1,468 $ 4,558 Gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ 1 $ 1 Recreational finance: Current $ 1,028 $ 2,531 $ 2,252 $ 1,790 $ 1,233 $ 1,719 $ — $ — $ 10,553 30-89 days past due 1 11 12 14 13 20 — — 71 Accruing loans past due — — — — — — — — — Nonaccrual — 4 6 6 4 10 — — 30 Total recreational finance $ 1,029 $ 2,546 $ 2,270 $ 1,810 $ 1,250 $ 1,749 $ — $ — $ 10,654 Gross charge-offs $ — $ 3 $ 5 $ 6 $ 4 $ 7 $ — $ — $ 25 Automobile: Current $ 684 $ 1,026 $ 1,004 $ 942 $ 371 $ 225 $ — $ — $ 4,252 30-89 days past due 1 7 11 11 6 7 — — 43 Accruing loans past due — — — — — — — — — Nonaccrual — 2 2 3 2 4 — — 13 Total automobile $ 685 $ 1,035 $ 1,017 $ 956 $ 379 $ 236 $ — $ — $ 4,308 Gross charge-offs $ — $ 2 $ 2 $ 2 $ 1 $ 1 $ — $ — $ 8 Other: Current $ 69 $ 219 $ 155 $ 105 $ 28 $ 27 $ 1,378 $ 1 $ 1,982 30-89 days past due 1 1 3 1 — 1 12 1 20 Accruing loans past due — — — — — — 8 — 8 Nonaccrual 1 1 1 — — — 51 — 54 Total other $ 71 $ 221 $ 159 $ 106 $ 28 $ 28 $ 1,449 $ 2 $ 2,064 Gross charge-offs $ 1 $ 3 $ 3 $ 1 $ 1 $ — $ 16 $ — $ 25 Total loans and leases at $ 5,121 $ 17,431 $ 20,835 $ 14,385 $ 10,088 $ 35,581 $ 29,937 $ 1,595 $ 134,973 Total gross charge-offs for $ 1 $ 15 $ 21 $ 13 $ 9 $ 35 $ 68 $ 1 $ 163 A summary of loans in accrual and nonaccrual status at December 31, 2023 for the various classes of the Company’s residential real estate loans and consumer loans by origination year follows: Term Loans by Origination Year Revolving Revolving Loans Converted to Term (Dollars in millions) 2023 2022 2021 2020 2019 Prior Loans Loans Total Residential: Current $ 1,726 $ 4,709 $ 3,732 $ 2,543 $ 1,215 $ 7,060 $ 95 $ — $ 21,080 30-89 days past due 18 120 88 52 28 457 — — 763 Accruing loans past due 1 30 28 17 14 205 — — 295 Nonaccrual 1 17 10 3 4 179 1 — 215 Total residential $ 1,746 $ 4,876 $ 3,858 $ 2,615 $ 1,261 $ 7,901 $ 96 $ — $ 22,353 Residential - limited Current $ — $ — $ — $ — $ — $ 825 $ — $ — $ 825 30-89 days past due — — — — — 31 — — 31 Accruing loans past due — — — — — — — — — Nonaccrual — — — — — 55 — — 55 Total residential - limited $ — $ — $ — $ — $ — $ 911 $ — $ — $ 911 Consumer: Home equity lines and loans: Current $ — $ — $ 2 $ 2 $ 13 $ 98 $ 3,022 $ 1,391 $ 4,528 30-89 days past due — — — — — 3 — 37 40 Accruing loans past due — — — — — — — — — Nonaccrual — — — — — 5 3 73 81 Total home equity lines and $ — $ — $ 2 $ 2 $ 13 $ 106 $ 3,025 $ 1,501 $ 4,649 Recreational finance: Current $ 2,653 $ 2,338 $ 1,857 $ 1,286 $ 781 $ 1,020 $ — $ — $ 9,935 30-89 days past due 11 16 19 14 11 16 — — 87 Accruing loans past due — — — — — — — — — Nonaccrual 3 5 8 6 5 9 — — 36 Total recreational finance $ 2,667 $ 2,359 $ 1,884 $ 1,306 $ 797 $ 1,045 $ — $ — $ 10,058 Automobile: Current $ 1,063 $ 1,096 $ 1,047 $ 427 $ 198 $ 87 $ — $ — $ 3,918 30-89 days past due 8 15 17 9 6 5 — — 60 Accruing loans past due — — — — — — — — — Nonaccrual 2 3 3 2 2 2 — — 14 Total automobile $ 1,073 $ 1,114 $ 1,067 $ 438 $ 206 $ 94 $ — $ — $ 3,992 Other: Current $ 250 $ 176 $ 118 $ 33 $ 13 $ 18 $ 1,392 $ 3 $ 2,003 30-89 days past due 3 3 2 — — 1 20 1 30 Accruing loans past due — — — — — — 7 — 7 Nonaccrual 2 1 1 — — — 48 — 52 Total other $ 255 $ 180 $ 121 $ 33 $ 13 $ 19 $ 1,467 $ 4 $ 2,092 Total loans and leases at $ 18,423 $ 21,683 $ 15,025 $ 10,555 $ 10,062 $ 27,464 $ 29,237 $ 1,619 $ 134,068
Changes in Allowance for Credit Losses	Changes in the allowance for credit losses for the three months ended March 31, 2024 and 2023 were as follows: Commercial and Real Estate (Dollars in millions) industrial Commercial Residential Consumer Total Three Months Ended March 31, 2024 Beginning balance $ 620 $ 764 $ 116 $ 629 $ 2,129 Provision for credit losses 137 9 2 52 200 Net charge-offs: Charge-offs ( 78 ) ( 25 ) ( 1 ) ( 59 ) ( 163 ) Recoveries 5 6 1 13 25 Net charge-offs ( 73 ) ( 19 ) — ( 46 ) ( 138 ) Ending balance $ 684 $ 754 $ 118 $ 635 $ 2,191 Three Months Ended March 31, 2023 Beginning balance $ 568 $ 611 $ 115 $ 631 $ 1,925 Provision for credit losses 21 86 ( 1 ) 14 120 Net charge-offs: Charge-offs ( 20 ) ( 29 ) ( 2 ) ( 44 ) ( 95 ) Recoveries 10 1 1 13 25 Net charge-offs ( 10 ) ( 28 ) ( 1 ) ( 31 ) ( 70 ) Ending balance $ 579 $ 669 $ 113 $ 614 $ 1,975
Loan and Leases Considered Nonaccrual and Interest Income Recognized on Loans	Information with respect to loans and leases that were considered nonaccrual at the beginning and end of the reporting period and the interest income recognized on such loans for the three-month periods ended March 31, 2024 and 2023 follows: Amortized Cost with Allowance Amortized Cost without Allowance Total Amortized Cost Interest Income Recognized (Dollars in millions) March 31, 2024 January 1, 2024 Three Months Ended March 31, Commercial and industrial $ 590 $ 274 $ 864 $ 670 $ 2 Real estate: Commercial 379 476 855 869 6 Residential builder and developer 3 — 3 3 — Other commercial construction 33 108 141 171 — Residential 82 120 202 215 3 Residential — limited documentation 18 35 53 55 1 Consumer: Home equity lines and loans 48 39 87 81 1 Recreational finance 18 12 30 36 — Automobile 7 6 13 14 — Other 54 — 54 52 — Total $ 1,232 $ 1,070 $ 2,302 $ 2,166 $ 13 (Dollars in millions) March 31, 2023 January 1, 2023 Three Months Ended March 31, Commercial and industrial $ 227 $ 342 $ 569 $ 504 $ 3 Real estate: Commercial 364 966 1,330 1,240 5 Residential builder and developer 3 — 3 1 — Other commercial construction 94 49 143 125 2 Residential 125 129 254 272 5 Residential — limited documentation 40 29 69 78 — Consumer: Home equity lines and loans 39 42 81 85 2 Recreational finance 24 10 34 45 — Automobile 23 4 27 40 — Other 47 — 47 49 — Total $ 986 $ 1,571 $ 2,557 $ 2,439 $ 17
Loan Modification Activities to Borrowers Experiencing Financial Difficulty on Financing Receivables	The table that follows summarizes the Company’s loan modification activities to borrowers experiencing financial difficulty for the three-month periods ended March 31, 2024 and 2023: Amortized cost at March 31, 2024 (Dollars in millions) Payment Deferral Interest Rate Reduction Other Combination of Modification Types (a) Total (b) (c) Percent of Total Loan Class Three Months Ended March 31, 2024 Commercial and industrial $ 184 $ — $ — $ — $ 184 .32 % Real estate: Commercial 267 — — 3 270 1.07 Residential builder and developer 2 — — — 2 .18 Other commercial construction 131 — — — 131 2.11 Residential 48 — — 1 49 .22 Residential — limited documentation 2 — — — 2 .17 Consumer: Home equity lines and loans — — — — — — Recreational finance — — — — — — Automobile — — — — — — Other — — — — — — Total $ 634 $ — $ — $ 4 $ 638 .47 % Amortized cost at March 31, 2023 (Dollars in millions) Payment Deferral Interest Rate Reduction Other Combination of Modification Types (a) Total (b) (c) Percent of Total Loan Class Three Months Ended March 31, 2023 Commercial and industrial $ 70 $ — $ — $ — $ 70 .13 % Real estate: Commercial 94 — — — 94 .35 Residential builder and developer 8 — — — 8 .64 Other commercial construction 92 — — — 92 1.39 Residential 33 — — 2 35 .15 Residential — limited documentation 5 — — — 5 .51 Consumer: Home equity lines and loans — — — — — — Recreational finance — — — — — — Automobile — — — — — — Other — — — — — — Total $ 302 $ — $ — $ 2 $ 304 .23 % (a) Predominantly payment deferrals combined with interest rate reductions. (b) Includes approximately $ 44 million and $ 23 million of loans guaranteed by government-related entities (predominantly first lien residential mortgage loans) for the three-month periods ended March 31, 2024 and 2023, respectively. (c) Excludes unfunded commitments to extend credit totaling $ 29 million and $ 11 million for the three-month periods ended March 31, 2024 and 2023, respectively.
Summary of Payment Status of Loans Modified	The following table summarizes the payment status, at March 31, 2024, of loans that were modified during the twelve-month period ended March 31, 2024. Payment status at March 31, 2024 (amortized cost) (Dollars in millions) Current 30-89 Days Past Due Past Due 90 Days or More (a) Total Twelve Months Ended March 31, 2024 Commercial and industrial $ 310 $ 7 $ 10 $ 327 Real estate: Commercial 715 33 24 772 Residential builder and developer 14 39 — 53 Other commercial construction 534 5 — 539 Residential (b) 112 35 30 177 Residential — limited documentation 6 2 — 8 Consumer: Home equity lines and loans 2 — — 2 Recreational finance — — — — Automobile — — — — Other — — — — Total $ 1,693 $ 121 $ 64 $ 1,878 (a) Predominantly loan modifications with payment deferrals. (b) Includes loans guaranteed by government-related entities classified as 30 to 89 days past due of $ 30 million and as past due 90 days or more of $ 27 million.

Borrowings (Tables)

Borrowings (Tables)	3 Months Ended
	Mar. 31, 2024
Debt Disclosure [Abstract]
Schedule of Borrowings	(Dollars in millions) March 31, 2024 December 31, 2023 Short-term borrowings Federal funds purchased and repurchase agreements $ 295 $ 316 FHLB advances 4,500 5,000 Total short-term borrowings $ 4,795 $ 5,316 Long-term borrowings Senior notes - M&T $ 3,276 $ 2,482 Senior notes - M&T Bank 3,743 3,741 FHLB advances 2,005 5 Subordinated notes - M&T 75 76 Subordinated notes - M&T Bank 866 873 Junior subordinated debentures - M&T 541 540 Asset-backed notes 934 474 Other 10 10 Total long-term borrowings $ 11,450 $ 8,201

Revenue from contracts with c_2

Revenue from contracts with customers (Tables)	3 Months Ended
	Mar. 31, 2024
ASU 2014-09 [Member]
Summary of Sources of Noninterest Income that are Subject to Revenue Recognition Accounting Guidance	The following tables summarize sources of the Company’s noninterest income during the three-month periods ended March 31, 2024 and 2023 that are subject to the revenue recognition accounting guidance. (Dollars in millions) Commercial Bank Retail Bank Institutional Services and Wealth Management Total Three Months Ended March 31, 2024 Classification in Consolidated Service charges on deposit accounts $ 40 $ 84 $ — $ 124 Trust income 1 — 159 160 Brokerage services income 2 — 27 29 Other revenues from operations: Merchant discount and credit card interchange fees 17 20 — 37 Other 8 7 2 17 $ 68 $ 111 $ 188 $ 367 Three Months Ended March 31, 2023 Classification in Consolidated Service charges on deposit accounts $ 34 $ 79 $ — $ 113 Trust income — — 194 194 Brokerage services income 2 — 22 24 Other revenues from operations: Merchant discount and credit card interchange fees 17 20 — 37 Other 6 8 1 15 $ 59 $ 107 $ 217 $ 383

Pension plans and other postr_2

Pension plans and other postretirement benefits (Tables)	3 Months Ended
	Mar. 31, 2024
Retirement Benefits [Abstract]
Net Periodic Defined Benefit Cost for Defined Benefit Plans	The Company provides defined pension and other postretirement benefits (including health care and life insurance benefits) to qualified retired employees. Net periodic benefit for defined benefit plans consisted of the following: Pension Other Three Months Ended March 31, (Dollars in millions) 2024 2023 2024 2023 Service cost $ 2 $ 3 $ — $ — Interest cost on projected benefit obligation 29 29 1 1 Expected return on plan assets ( 51 ) ( 51 ) — — Amortization of net actuarial gain — ( 1 ) ( 1 ) ( 1 ) Net periodic benefit $ ( 20 ) $ ( 20 ) $ — $ —

Earnings per common share (Tabl

Earnings per common share (Tables)	3 Months Ended
	Mar. 31, 2024
Earnings Per Share [Abstract]
Computations of Basic Earnings Per Common Share	The computations of basic earnings per common share follow: Three Months Ended March 31, (Dollars in millions, except per share, shares in thousands) 2024 2023 Income available to common shareholders: Net income $ 531 $ 702 Less: Preferred stock dividends ( 25 ) ( 25 ) Net income available to common equity 506 677 Less: Income attributable to unvested stock-based ( 1 ) ( 1 ) Net income available to common shareholders $ 505 $ 676 Weighted-average shares outstanding: Common shares outstanding (including common stock 166,738 168,010 Less: Unvested stock-based compensation awards ( 278 ) ( 278 ) Weighted-average shares outstanding 166,460 167,732 Basic earnings per common share $ 3.04 $ 4.03
Computations of Diluted Earnings Per Common Share	The computations of diluted earnings per common share follow: Three Months Ended March 31, (Dollars in millions, except per share, shares in thousands) 2024 2023 Net income available to common equity $ 506 $ 677 Less: Income attributable to unvested stock-based ( 1 ) ( 1 ) Net income available to common shareholders $ 505 $ 676 Adjusted weighted-average shares outstanding: Common shares outstanding (including common stock 166,738 168,010 Less: Unvested stock-based compensation awards ( 278 ) ( 278 ) Plus: Incremental shares from assumed conversion 624 678 Adjusted weighted-average shares outstanding 167,084 168,410 Diluted earnings per common share $ 3.02 $ 4.01

Comprehensive income (Tables)

Comprehensive income (Tables)	3 Months Ended
	Mar. 31, 2024
Equity [Abstract]
Components of Other Comprehensive Income (Loss) and Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Net Income	The following tables display the components of other comprehensive income (loss) and amounts reclassified from accumulated other comprehensive income (loss) to net income: Investment Cash Flow Defined Benefit Total Income (Dollars in millions) Securities Hedges Plans Other Before Tax Tax Net Balance — January 1, 2024 $ ( 251 ) $ ( 203 ) $ ( 155 ) $ ( 7 ) $ ( 616 ) $ 157 $ ( 459 ) Other comprehensive income (loss) before reclassifications: Unrealized holding losses, net ( 13 ) — — — ( 13 ) 2 ( 11 ) Foreign currency translation adjustment — — — ( 2 ) ( 2 ) — ( 2 ) Unrealized losses on cash flow hedges — ( 243 ) — — ( 243 ) 60 ( 183 ) Total other comprehensive income (loss) before ( 13 ) ( 243 ) — ( 2 ) ( 258 ) 62 ( 196 ) Amounts reclassified from accumulated other comprehensive Losses realized in net income 1 — — — 1 — 1 Net yield adjustment from cash flow hedges — 87 — — 87 (a) ( 21 ) 66 Amortization of actuarial losses — — ( 1 ) — ( 1 ) (b) — ( 1 ) Total other comprehensive income (loss) ( 12 ) ( 156 ) ( 1 ) ( 2 ) ( 171 ) 41 ( 130 ) Balance — March 31, 2024 $ ( 263 ) $ ( 359 ) $ ( 156 ) $ ( 9 ) $ ( 787 ) $ 198 $ ( 589 ) Balance — January 1, 2023 $ ( 444 ) $ ( 336 ) $ ( 273 ) $ ( 13 ) $ ( 1,066 ) $ 276 $ ( 790 ) Other comprehensive income (loss) before reclassifications: Unrealized holding gains, net 89 — — — 89 ( 24 ) 65 Foreign currency translation adjustment — — — 2 2 ( 1 ) 1 Unrealized losses on cash flow hedges — 51 — — 51 ( 13 ) 38 Total other comprehensive income (loss) before 89 51 — 2 142 ( 38 ) 104 Amounts reclassified from accumulated other comprehensive Net yield adjustment from cash flow hedges — 59 — — 59 (a) ( 16 ) 43 Amortization of actuarial losses — — ( 2 ) — ( 2 ) (b) — ( 2 ) Total other comprehensive income (loss) 89 110 ( 2 ) 2 199 ( 54 ) 145 Balance — March 31, 2023 $ ( 355 ) $ ( 226 ) $ ( 275 ) $ ( 11 ) $ ( 867 ) $ 222 $ ( 645 ) (a) Included in "interest income" in the Consolidated Statement of Income. (b) Included in "other costs of operations" in the Consolidated Statement of Income.
Accumulated Other Comprehensive Income (Loss), Net	Accumulated other comprehensive income (loss), net consisted of the following: Defined Investment Cash Flow Benefit (Dollars in millions) Securities Hedges Plans Other Total Balance — December 31, 2023 $ ( 187 ) $ ( 151 ) $ ( 115 ) $ ( 6 ) $ ( 459 ) Net loss during period ( 10 ) ( 117 ) ( 1 ) ( 2 ) ( 130 ) Balance — March 31, 2024 $ ( 197 ) $ ( 268 ) $ ( 116 ) $ ( 8 ) $ ( 589 )

Derivative financial instrume_2

Derivative financial instruments (Tables)	3 Months Ended
	Mar. 31, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Information about Interest Rate Swap Agreements	Information about interest rate swap agreements entered into for interest rate risk management purposes summarized by type of financial instrument the swap agreements were intended to hedge follows: Average Weighted- Estimated Notional Maturity Average Rate Fair Value (Dollars in millions) Amount (In years) Fixed Variable Gain (Loss) (a) March 31, 2024 Fair value hedges: Fixed rate long-term borrowings (b) (c) $ 3,850 5.9 3.48 % 5.51 % $ — Cash flow hedges: Interest payments on variable rate commercial real estate 23,427 1.7 3.38 5.33 2 Total $ 27,277 2.3 $ 2 December 31, 2023 Fair value hedges: Fixed rate long-term borrowings (b) (e) $ 3,000 5.8 3.45 % 5.62 % $ ( 1 ) Cash flow hedges: Interest payments on variable rate commercial real estate 23,977 1.7 3.45 5.36 11 Total $ 26,977 2.2 $ 10 (a) Certain clearinghouse exchanges consider payments by counterparties for variation margin on derivative instruments to be settlements of those positions. The impact of such payments for interest rate swap agreements designated as fair value hedges was a net settlement of losses of $ 104 million at March 31, 2024 and $ 43 million at December 31, 2023. The impact of such payments on interest rate swap agreements designated as cash flow hedges was a net settlement of losses of $ 361 million at March 31, 2024 and $ 214 million at December 31, 2023. (b) Under the terms of these agreements, the Company receives settlement amounts at a fixed rate and pays at a variable rate. (c) Includes notional amount and terms of $ 1.8 billion of forward-starting interest rate swap agreements that become effective in 2025. (d) Includes notional amount and terms of $ 6.0 billion of forward-starting interest rate swap agreements that become effective in 2024 and 2025. (e) Includes notional amount and terms of $ 1.0 billion of forward-starting interest rate swap agreements that become effective in 2025. (f) Includes notional amount and terms of $ 9.0 billion of forward-starting interest rate swap agreements that become effective in 2024.
Information about Fair Values of Derivative Instruments in Consolidated Balance Sheet	Information about the fair values of derivative instruments in the Company’s Consolidated Balance Sheet and Consolidated Statement of Income follows: Asset Derivatives Liability Derivatives Fair Value Fair Value March 31, December 31, March 31, December 31, (Dollars in millions) 2024 2023 2024 2023 Derivatives designated and qualifying as hedging Interest rate swap agreements $ 3 $ 12 $ 1 $ 2 Commitments to sell real estate loans 11 6 1 8 14 18 2 10 Derivatives not designated and qualifying as hedging Mortgage banking: Commitments to originate real estate loans for sale 6 15 36 32 Commitments to sell real estate loans 40 35 2 3 46 50 38 35 Other: Interest rate contracts (b) 243 237 1,019 879 Foreign exchange and other option and futures contracts 15 19 13 19 258 256 1,032 898 Total derivatives $ 318 $ 324 $ 1,072 $ 943 (a) Asset derivatives are reported in "accrued interest and other assets" and liability derivatives are reported in "accrued interest and other liabilities" in the Consolidated Balance Sheet. (b) The impact of variation margin payments at March 31, 2024 and December 31, 2023 was a reduction of the estimated fair value of interest rate contracts not designated as hedging instruments in an asset position of $ 893 million and $ 783 million , respectively, as of each period end, and in a liability position of $ 16 million and $ 32 million , respectively. Carrying Amount of the Hedged Item Cumulative Amount of Fair Value Hedging Adjustment Increasing (Decreasing) the Carrying Amount of the Hedged Item (Dollars in millions) March 31, 2024 December 31, 2023 March 31, 2024 December 31, 2023 Location in the Consolidated Balance Sheet Hedges Long-term borrowings $ 3,742 $ 2,954 $ ( 104 ) $ ( 44 )
Information about Fair Values of Derivative Instruments in Consolidated Statement of Income	Amount of Gain (Loss) Recognized Three Months Ended March 31, 2024 2023 (Dollars in millions) Derivative Hedged Item Derivative Hedged Item Derivatives in fair value hedging relationships Interest rate swap agreements: Fixed rate long-term borrowings (a) $ ( 60 ) $ 60 $ 12 $ ( 12 ) Derivatives not designated as hedging instruments Interest rate contracts (b) $ 3 $ 8 Foreign exchange and other option and futures contracts (b) 4 4 Total $ 7 $ 12 (a) Reported as an adjustment to "interest expense" in the Consolidated Statement of Income. (b) Reported as "trading account and other non-hedging derivative gains" in the Consolidated Statement of Income.

Variable interest entities an_2

Variable interest entities and asset securitizations (Tables)	3 Months Ended
	Mar. 31, 2024
Variable Interest Entity Disclosure [Abstract]
Schedule of Carrying Amount of Investments In Tax Equity Partnerships and Related Future Funding Commitments	Information on the Company’s carrying amount of its investments in tax equity partnerships and its related future funding commitments are presented in the following table: (Dollars in millions) March 31, 2024 December 31, 2023 Affordable housing projects: Carrying amount (a) $ 1,323 $ 1,340 Amount of future funding commitments included in carrying amount (b) 379 410 Contingent commitments 55 55 Renewable energy: Carrying amount (a) 79 80 Amount of future funding commitments included in carrying amount (b) 49 31 Other: Carrying amount (a) 40 41 Amount of future funding commitments included in carrying amount (b) — — (a) Included in "accrued interest and other assets" in the Consolidated Balance Sheet . (b) Included in "accrued interest and other liabilities" in the Consolidated Balance Sheet.

Fair value measurements (Tables

Fair value measurements (Tables)	3 Months Ended
	Mar. 31, 2024
Fair Value Disclosures [Abstract]
Assets and Liabilities Measured at Estimated Fair Value on Recurring Basis	The following tables present assets and liabilities at March 31, 2024 and December 31, 2023 measured at estimated fair value on a recurring basis: (Dollars in millions) Fair Value Measurements Level 1 Level 2 Level 3 (a) March 31, 2024 Trading account $ 99 $ 99 $ — $ — Investment securities available for sale: U.S. Treasury and federal agencies 7,719 — 7,719 — Mortgage-backed securities: Government issued or guaranteed Commercial 1,343 — 1,343 — Residential 2,910 — 2,910 — Other debt securities 162 — 162 — 12,134 — 12,134 — Equity securities 356 343 13 — Real estate loans held for sale 728 — 728 — Other assets (b) 318 — 312 6 Total assets $ 13,635 $ 442 $ 13,187 $ 6 Other liabilities (b) $ 1,072 $ — $ 1,036 $ 36 Total liabilities $ 1,072 $ — $ 1,036 $ 36 December 31, 2023 Trading account $ 106 $ 101 $ 5 $ — Investment securities available for sale: U.S. Treasury and federal agencies 7,705 — 7,705 — Mortgage-backed securities: Government issued or guaranteed Commercial 416 — 416 — Residential 2,154 — 2,154 — Other debt securities 165 — 165 — 10,440 — 10,440 — Equity securities 268 258 10 — Real estate loans held for sale 379 — 379 — Other assets (b) 324 — 309 15 Total assets $ 11,517 $ 359 $ 11,143 $ 15 Other liabilities (b) $ 943 $ — $ 911 $ 32 Total liabilities $ 943 $ — $ 911 $ 32 (a) Significant unobservable inputs used in the fair value measurement of commitments to originate real estate loans held for sale included weighted-average commitment expirations of 8 % at March 31, 2024 and 5 % at December 31, 2023. An increase (decrease) in the estimate of expirations for commitments to originate real estate loans would generally result in a lower (higher) fair value measurement. Estimated commitment expirations are derived considering loan type, changes in interest rates and remaining length of time until closing. (b) Comprised predominantly of interest rate swap agreements used for interest rate risk management (Level 2), interest rate and foreign exchange contracts not designated as hedging instruments (Level 2), commitments to sell real estate loans (Level 2) and commitments to originate real estate loans to be held for sale (Level 3).
Carrying Amounts and Estimated Fair Value for Certain Financial Instruments	The carrying amounts and estimated fair value for certain financial instruments that are not recorded at fair value in the Consolidated Balance Sheet are presented in the following tables: (Dollars in millions) Carrying Estimated Level 1 Level 2 Level 3 March 31, 2024 Financial assets: Cash and cash equivalents $ 1,695 $ 1,695 $ 1,396 $ 299 $ — Interest-bearing deposits at banks 32,144 32,144 — 32,144 — Investment securities held to maturity 15,078 13,865 — 13,821 44 Loans and leases, net 132,782 129,771 — 7,354 122,417 Financial liabilities: Time deposits 20,279 20,236 — 20,236 — Short-term borrowings 4,795 4,795 — 4,795 — Long-term borrowings 11,450 11,370 — 11,370 — December 31, 2023 Financial assets: Cash and cash equivalents 1,731 1,731 1,668 63 — Interest-bearing deposits at banks 28,069 28,069 — 28,069 — Investment securities held to maturity 15,330 14,308 — 14,262 46 Loans and leases, net 131,939 129,138 — 7,240 121,898 Financial liabilities: Time deposits 20,759 20,715 — 20,715 — Short-term borrowings 5,316 5,316 — 5,316 — Long-term borrowings 8,201 8,107 — 8,107 —

Commitments and contingencies (

Commitments and contingencies (Tables)	3 Months Ended
	Mar. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingent Liabilities Outstanding	The following table presents the Company's significant commitments. Certain of these commitments are not included in the Company's Consolidated Balance Sheet. March 31, December 31, (Dollars in millions) 2024 2023 Commitments to extend credit: Commercial and industrial $ 28,439 $ 28,566 Commercial real estate loans to be sold 451 916 Other commercial real estate 4,413 5,019 Residential real estate loans to be sold 211 163 Other residential real estate 393 331 Home equity lines of credit 8,080 8,109 Credit cards 5,651 5,578 Other 389 413 Standby letters of credit 2,230 2,289 Commercial letters of credit 56 62 Financial guarantees and indemnification contracts 4,129 4,036 Commitments to sell real estate loans 1,329 1,400

Segment information (Tables)

Segment information (Tables)	3 Months Ended
	Mar. 31, 2024
Segment Reporting [Abstract]
Information about Company's Segments	Information about the Company's segments follows: Three Months Ended March 31, 2024 2023 (Dollars in millions) Total Revenues(a) Inter- Net Total Average Assets Total Revenues(a) Inter- Net Total Average Assets Commercial Bank $ 699 $ 2 $ 201 $ 81,083 $ 811 $ 2 $ 333 $ 79,034 Retail Bank 1,268 — 446 52,232 1,234 — 452 51,293 Institutional Services and Wealth 377 3 128 3,636 390 3 110 3,655 All Other ( 84 ) ( 5 ) ( 244 ) 74,527 ( 30 ) ( 5 ) ( 193 ) 68,617 Total $ 2,260 $ — $ 531 $ 211,478 $ 2,405 $ — $ 702 $ 202,599 (a) Total revenues are comprised of net interest income and other income. Net interest income is the difference between taxable-equivalent interest earned on assets and interest paid on liabilities owed by a segment and a funding charge (credit) based on the Company's internal funds transfer and allocation 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 $ 12 million and $ 14 million for the three-month periods ended March 31, 2024 and 2023 and is eliminated in "All Other" total revenues.

Divestiture - Additional Inform

Divestiture - Additional Information (Details) - Trust Income [Member] - USD ($) $ in Millions		3 Months Ended
	Apr. 29, 2023	Mar. 31, 2024	Mar. 31, 2023
Business Acquisition [Line Items]
Revenue from contract with customer		$ 160	$ 194
Collective Investment Trust [Member]
Business Acquisition [Line Items]
Gain (loss) on sale of subsidiary, pre-tax	$ 225
Gain (loss) on sale of subsidiary after-tax effect	$ 157
Revenue from contract with customer			$ 45

Investment Securities - Amortiz

Investment Securities - Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Schedule Of Amortized Cost And Estimated Fair Value Of Investment Securities [Line Items]
Investment securities available for sale, amortized cost	$ 12,397	$ 10,691
Investment securities available for sale, gross unrealized gains	1
Investment securities available for sale, gross unrealized losses	264	251
Investment securities available for sale, estimated fair value	12,134	10,440
Amortized cost for held to maturity	15,078	15,330
Gross unrealized gains for held to maturity	9	13
Gross unrealized losses for held to maturity	1,222	1,035
Estimated fair value for held to maturity	13,865	14,308
Equity and other securities, Amortized Cost	1,279	1,125
Equity securities, Gross Unrealized Gains	8	5
Equity securities, Gross Unrealized Losses	3	3
Equity and other securities, Estimated Fair Value	1,284	1,127
Other securities, Amortized cost	928	859
Other securities, Estimated fair value	928	859
Total debt securities Amortized cost	27,475	26,021
Total debt securities Gross unrealized gains	10	13
Total debt securities Gross unrealized losses	1,486	1,286
Total debt securities Estimated fair value	25,999	24,748
Readily marketable securities Amortized cost	351	266
Readily marketable securities Gross unrealized gains	8	5
Readily marketable securities Gross unrealized losses	3	3
Readily marketable securities Estimated fair value	356	268
U.S. Treasury and Federal Agencies [Member]
Schedule Of Amortized Cost And Estimated Fair Value Of Investment Securities [Line Items]
Investment securities available for sale, amortized cost	7,818	7,818
Investment securities available for sale, gross unrealized losses	99	113
Investment securities available for sale, estimated fair value	7,719	7,705
Amortized cost for held to maturity	1,007	1,005
Gross unrealized losses for held to maturity	33	31
Estimated fair value for held to maturity	974	974
Obligations of States and Political Subdivisions [Member]
Schedule Of Amortized Cost And Estimated Fair Value Of Investment Securities [Line Items]
Amortized cost for held to maturity	2,466	2,501
Gross unrealized losses for held to maturity	94	67
Estimated fair value for held to maturity	2,372	2,434
Commercial [Member]
Schedule Of Amortized Cost And Estimated Fair Value Of Investment Securities [Line Items]
Investment securities available for sale, amortized cost	1,355	425
Investment securities available for sale, gross unrealized gains	1
Investment securities available for sale, gross unrealized losses	13	9
Investment securities available for sale, estimated fair value	1,343	416
Amortized cost for held to maturity	2,035	2,033
Gross unrealized losses for held to maturity	154	130
Estimated fair value for held to maturity	1,881	1,903
Residential [Member]
Schedule Of Amortized Cost And Estimated Fair Value Of Investment Securities [Line Items]
Investment securities available for sale, amortized cost	3,053	2,272
Investment securities available for sale, gross unrealized losses	143	118
Investment securities available for sale, estimated fair value	2,910	2,154
Amortized cost for held to maturity	9,527	9,747
Gross unrealized gains for held to maturity		4
Gross unrealized losses for held to maturity	935	802
Estimated fair value for held to maturity	8,592	8,949
Other Debt Securities [Member]
Schedule Of Amortized Cost And Estimated Fair Value Of Investment Securities [Line Items]
Investment securities available for sale, amortized cost	171	176
Investment securities available for sale, gross unrealized losses	9	11
Investment securities available for sale, estimated fair value	162	165
Amortized cost for held to maturity	2	2
Estimated fair value for held to maturity	2	2
Privately Issued [Member]
Schedule Of Amortized Cost And Estimated Fair Value Of Investment Securities [Line Items]
Amortized cost for held to maturity	41	42
Gross unrealized gains for held to maturity	9	9
Gross unrealized losses for held to maturity	6	5
Estimated fair value for held to maturity	$ 44	$ 46

Investment Securities - Additio

Investment Securities - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2024 USD ($) Security	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)
Summary of Investment Holdings [Line Items]
Gross realized gains(loss) on sale of investment securities	$ 0	$ 0
Gains (losses) on equity securities	$ 2,000,000
Number of debt securities with aggregate gross unrealized losses | Security	4,088
Unrealized losses on individual debt securities	$ (1,500,000,000)
Cost method equity securities	928,000,000
Investment securities pledged to secure debt carrying value	9,600,000,000		$ 8,200,000,000
Carrying value of investment securities pledged related to repurchase transactions	357,000,000		393,000,000
Available-for-Sale Securities [Member]
Summary of Investment Holdings [Line Items]
Allowance for credit losses	$ 0		$ 0

Investment Securities - Amort_2

Investment Securities - Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Debt securities available for sale:
Due in one year or less	$ 3,248
Due after one year through five years	4,691
Due after five years through ten years	50
Total available for sale (amortized cost)	7,989
Mortgage-backed securities	4,408
Investment securities available for sale, amortized cost	12,397	$ 10,691
Debt securities held to maturity:
Due in one year or less	588
Due after one year through five years	635
Due after five years through ten years	1,369
Due after ten years	883
Total available for held to maturity (amortized cost)	3,475
Mortgage-backed securities	11,603
Amortized cost for held to maturity	15,078	15,330
Debt securities available for sale:
Due in one year or less	3,209
Due after one year through five years	4,628
Due after five years through ten years	44
Total available for sale (fair value)	7,881
Mortgage-backed securities	4,253
Total	12,134	10,440
Debt securities held to maturity:
Due in one year or less	575
Due after one year through five years	611
Due after five years through ten years	1,333
Due after ten years	829
Total available for held to maturity (fair value)	3,348
Mortgage-backed securities	10,517
Total	$ 13,865	$ 14,308

Investment Securities - Investm

Investment Securities - Investment Securities in Continuous Unrealized Loss Position (Detail) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Estimated fair value, Less than 12 months	$ 3,820	$ 460
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses	22	4
Estimated fair value, 12 months or more	7,690	9,917
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses	242	247
Held to maturity, Estimated fair value, Less than 12 months	1,397	1,551
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses	22	23
Held to maturity, Estimated fair value, 12 months or more	12,410	11,844
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses	1,200	1,012
Total investment securities, fair value less than 12 months	5,217	2,011
Investment Securities Continuous Unrealized Loss Position Less Than Twelve Months Aggregate Losses	44	27
Total of investment securities, fair value, 12 Months or More	20,100	21,761
Investment Securities Continuous Unrealized Loss Position Twelve Months or Longer Aggregate Losses	1,442	1,259
U.S. Treasury and Federal Agencies [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Estimated fair value, Less than 12 months	2,242	229
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses	10	1
Estimated fair value, 12 months or more	5,177	7,474
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses	89	112
Held to maturity, Estimated fair value, Less than 12 months	49	50
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses	1
Held to maturity, Estimated fair value, 12 months or more	925	924
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses	32	31
Commercial [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Estimated fair value, Less than 12 months	765	74
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses	6	1
Estimated fair value, 12 months or more	393	330
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses	7	8
Held to maturity, Estimated fair value, Less than 12 months	172	328
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses	9	9
Held to maturity, Estimated fair value, 12 months or more	1,709	1,575
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses	145	121
Residential [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Estimated fair value, Less than 12 months	813	151
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses	6	2
Estimated fair value, 12 months or more	1,964	1,959
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses	137	116
Held to maturity, Estimated fair value, Less than 12 months	1,133	955
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses	12	11
Held to maturity, Estimated fair value, 12 months or more	7,459	7,139
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses	923	791
Obligations of States and Political Subdivisions [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Held to maturity, Estimated fair value, Less than 12 months	43	218
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses		3
Held to maturity, Estimated fair value, 12 months or more	2,284	2,172
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses	94	64
Other Debt Securities [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Estimated fair value, Less than 12 months		6
Estimated fair value, 12 months or more	156	154
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses	9	11
Privately Issued [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Held to maturity, Estimated fair value, 12 months or more	33	34
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses	$ 6	$ 5

Loans and Leases and the Allo_3

Loans and Leases and the Allowance for Credit Losses - Summary of Current, Past Due and Nonaccrual Loans (Detail) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	$ 1,410	$ 1,724
Accruing Loans Past Due 90 Days or More	297	339
Nonaccrual	2,302	2,166
Loans and leases, net of unearned discount	134,973	134,068
Current [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	130,964	129,839
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	219	238
Accruing Loans Past Due 90 Days or More	11	11
Nonaccrual	864	670
Loans and leases, net of unearned discount	57,897	57,010
Commercial and Industrial [Member] | Current [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	56,803	56,091
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	163	311
Accruing Loans Past Due 90 Days or More	31	25
Nonaccrual	855	869
Loans and leases, net of unearned discount	25,168	25,277
Commercial [Member] | Current [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	24,119	24,072
Residential Builder and Developer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	48	5
Nonaccrual	3	3
Loans and leases, net of unearned discount	1,035	1,073
Residential Builder and Developer [Member] | Current [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	984	1,065
Other Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	155	159
Accruing Loans Past Due 90 Days or More	2	1
Nonaccrual	141	171
Loans and leases, net of unearned discount	6,213	6,653
Other Commercial Construction [Member] | Current [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	5,915	6,322
Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	627	763
Accruing Loans Past Due 90 Days or More	245	295
Nonaccrual	202	215
Loans and leases, net of unearned discount	22,192	22,353
Residential [Member] | Current [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	21,118	21,080
Residential Limited Documentation [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	30	31
Nonaccrual	53	55
Loans and leases, net of unearned discount	884	911
Residential Limited Documentation [Member] | Current [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	801	825
Home Equity Lines and Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	34	40
Nonaccrual	87	81
Loans and leases, net of unearned discount	4,558	4,649
Home Equity Lines and Loans [Member] | Current [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	4,437	4,528
Recreational Finance [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	71	87
Nonaccrual	30	36
Loans and leases, net of unearned discount	10,654	10,058
Recreational Finance [Member] | Current [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	10,553	9,935
Automobile [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	43	60
Nonaccrual	13	14
Loans and leases, net of unearned discount	4,308	3,992
Automobile [Member] | Current [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	4,252	3,918
Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	20	30
Accruing Loans Past Due 90 Days or More	8	7
Nonaccrual	54	52
Loans and leases, net of unearned discount	2,064	2,092
Other [Member] | Current [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 1,982	$ 2,003

Loans and Leases and the Allo_4

Loans and Leases and the Allowance for Credit Losses - Summary of Current, Past Due and Nonaccrual Loans (Parenthetical) (Detail) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Commercial [Member] | Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans held for sale	$ 563	$ 189
One-to-Four Family Residential [Member] | Residential [Member] | Residential Mortgage Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans held for sale	$ 165	$ 190

Loans and Leases and the Allo_5

Loans and Leases and the Allowance for Credit Losses - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Loans And Leases Receivable [Line Items]
Amount of foreclosed residential real estate property held	$ 38		$ 39
Loans secured by residential real estate that were in the process of foreclosure	$ 165		170
Percentage loans in the process of foreclosure, serviced by other entities, classified as government guaranteed	35%
Minimum [Member]
Loans And Leases Receivable [Line Items]
Loan delinquent period	90 days
Maximum [Member]
Loans And Leases Receivable [Line Items]
Loan delinquent period	150 days
Commercial and Industrial [Member]
Loans And Leases Receivable [Line Items]
Weighted-average remaining term	8 months 12 days	1 year 2 months 12 days
Commercial Real Estate Loans [Member]
Loans And Leases Receivable [Line Items]
Weighted-average remaining term	9 months 18 days	1 year 2 months 12 days
Commercial Loans and Commercial Real Estate [Member] | Minimum [Member]
Loans And Leases Receivable [Line Items]
Amount of real estate loan as reported as accruing or nonaccruing	$ 5
Residential Real Estate Loans [Member]
Loans And Leases Receivable [Line Items]
Weighted-average remaining term	11 years 4 months 24 days	9 years 1 month 6 days
Commercial and Industrial Loans [Member] | Asset Pledged as Collateral without Right [Member] | FHLBs Facility [Member]
Loans And Leases Receivable [Line Items]
Pledged financial instruments	$ 14,900		13,400
Residential Mortgage Loans [Member] | Asset Pledged as Collateral without Right [Member] | FHLBs Facility [Member]
Loans And Leases Receivable [Line Items]
Pledged financial instruments	18,600		18,800
Commercial Real Estate Loans [Member] | Asset Pledged as Collateral without Right [Member] | FHLBs Facility [Member]
Loans And Leases Receivable [Line Items]
Pledged financial instruments	16,200		16,400
Home Equity Loans and Lines of Credit [Member] | Asset Pledged as Collateral without Right [Member] | FHLBs Facility [Member]
Loans And Leases Receivable [Line Items]
Pledged financial instruments	2,600		2,600
Other Consumer Loans [Member] | Asset Pledged as Collateral without Right [Member] | FHLBs Facility [Member]
Loans And Leases Receivable [Line Items]
Pledged financial instruments	$ 10,900		$ 11,000

Loans and Leases and the Allo_6

Loans and Leases and the Allowance for Credit Losses - Summary of Loan grades applied various classes of Commercial and Industrial Loans and Commercial Real Estate Loans (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	$ 134,973	$ 134,068
Gross charge-offs	163
Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	29,937	29,237
Gross charge-offs	68
Revolving Loans Converted to Term Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,595	1,619
Gross charge-offs	1
Term Loans 2024 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	5,121
Gross charge-offs	1
Term Loans 2023 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	17,431	18,423
Gross charge-offs	15
Term Loans 2022 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	20,835	21,683
Gross charge-offs	21
Term Loans 2021 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	14,385	15,025
Gross charge-offs	13
Term Loans 2020 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	10,088	10,555
Gross charge-offs	9
Term Loans 2019 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount		10,062
Term Loans Prior Period [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	35,581	27,464
Gross charge-offs	35
Commercial and Industrial [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	57,897	57,010
Gross charge-offs	78
Commercial and Industrial [Member] | Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	24,828	24,048
Gross charge-offs	50
Commercial and Industrial [Member] | Revolving Loans Converted to Term Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	125	114
Commercial and Industrial [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	53,497	53,251
Commercial and Industrial [Member] | Pass [Member] | Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	22,719	22,345
Commercial and Industrial [Member] | Pass [Member] | Revolving Loans Converted to Term Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	74	70
Commercial and Industrial [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	3,536	3,089
Commercial and Industrial [Member] | Criticized Accrual [Member] | Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,745	1,460
Commercial and Industrial [Member] | Criticized Accrual [Member] | Revolving Loans Converted to Term Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	35	31
Commercial and Industrial [Member] | Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	864	670
Commercial and Industrial [Member] | Criticized Nonaccrual [Member] | Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	364	243
Commercial and Industrial [Member] | Criticized Nonaccrual [Member] | Revolving Loans Converted to Term Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	16	13
Commercial and Industrial [Member] | Term Loans 2024 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	2,046
Commercial and Industrial [Member] | Term Loans 2024 [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	2,012
Commercial and Industrial [Member] | Term Loans 2024 [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	32
Commercial and Industrial [Member] | Term Loans 2024 [Member] | Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	2
Commercial and Industrial [Member] | Term Loans 2023 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	8,489	9,010
Gross charge-offs	7
Commercial and Industrial [Member] | Term Loans 2023 [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	8,129	8,689
Commercial and Industrial [Member] | Term Loans 2023 [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	306	292
Commercial and Industrial [Member] | Term Loans 2023 [Member] | Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	54	29
Commercial and Industrial [Member] | Term Loans 2022 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	8,078	8,434
Gross charge-offs	9
Commercial and Industrial [Member] | Term Loans 2022 [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	7,567	8,087
Commercial and Industrial [Member] | Term Loans 2022 [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	422	279
Commercial and Industrial [Member] | Term Loans 2022 [Member] | Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	89	68
Commercial and Industrial [Member] | Term Loans 2021 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	4,780	5,133
Gross charge-offs	4
Commercial and Industrial [Member] | Term Loans 2021 [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	4,441	4,800
Commercial and Industrial [Member] | Term Loans 2021 [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	277	277
Commercial and Industrial [Member] | Term Loans 2021 [Member] | Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	62	56
Commercial and Industrial [Member] | Term Loans 2020 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	2,287	2,465
Gross charge-offs	3
Commercial and Industrial [Member] | Term Loans 2020 [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	2,099	2,248
Commercial and Industrial [Member] | Term Loans 2020 [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	117	142
Commercial and Industrial [Member] | Term Loans 2020 [Member] | Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	71	75
Commercial and Industrial [Member] | Term Loans 2019 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount		2,332
Commercial and Industrial [Member] | Term Loans 2019 [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount		2,169
Commercial and Industrial [Member] | Term Loans 2019 [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount		127
Commercial and Industrial [Member] | Term Loans 2019 [Member] | Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount		36
Commercial and Industrial [Member] | Term Loans Prior Period [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	7,264	5,474
Gross charge-offs	5
Commercial and Industrial [Member] | Term Loans Prior Period [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	6,456	4,843
Commercial and Industrial [Member] | Term Loans Prior Period [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	602	481
Commercial and Industrial [Member] | Term Loans Prior Period [Member] | Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	206	150
Commercial [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	25,168	25,277
Gross charge-offs	13
Commercial [Member] | Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	444	450
Commercial [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	19,188	19,158
Commercial [Member] | Pass [Member] | Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	435	440
Commercial [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	5,125	5,250
Commercial [Member] | Criticized Accrual [Member] | Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	7	7
Commercial [Member] | Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	855	869
Commercial [Member] | Criticized Nonaccrual [Member] | Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	2	3
Commercial [Member] | Term Loans 2024 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	696
Commercial [Member] | Term Loans 2024 [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	696
Commercial [Member] | Term Loans 2023 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	2,056	2,275
Commercial [Member] | Term Loans 2023 [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,783	2,048
Commercial [Member] | Term Loans 2023 [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	273	227
Commercial [Member] | Term Loans 2022 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	2,513	2,679
Commercial [Member] | Term Loans 2022 [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,652	1,742
Commercial [Member] | Term Loans 2022 [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	815	891
Commercial [Member] | Term Loans 2022 [Member] | Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	46	46
Commercial [Member] | Term Loans 2021 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,806	1,835
Commercial [Member] | Term Loans 2021 [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,331	1,367
Commercial [Member] | Term Loans 2021 [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	464	465
Commercial [Member] | Term Loans 2021 [Member] | Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	11	3
Commercial [Member] | Term Loans 2020 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	2,672	2,580
Commercial [Member] | Term Loans 2020 [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	2,013	2,011
Commercial [Member] | Term Loans 2020 [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	558	456
Commercial [Member] | Term Loans 2020 [Member] | Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	101	113
Commercial [Member] | Term Loans 2019 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount		4,118
Commercial [Member] | Term Loans 2019 [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount		3,059
Commercial [Member] | Term Loans 2019 [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount		966
Commercial [Member] | Term Loans 2019 [Member] | Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount		93
Commercial [Member] | Term Loans Prior Period [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	14,981	11,340
Gross charge-offs	13
Commercial [Member] | Term Loans Prior Period [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	11,278	8,491
Commercial [Member] | Term Loans Prior Period [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	3,008	2,238
Commercial [Member] | Term Loans Prior Period [Member] | Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	695	611
Residential Builder and Developer [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,035	1,073
Gross charge-offs	1
Residential Builder and Developer [Member] | Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	104	119
Residential Builder and Developer [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	940	959
Residential Builder and Developer [Member] | Pass [Member] | Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	102	116
Residential Builder and Developer [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	92	111
Residential Builder and Developer [Member] | Criticized Accrual [Member] | Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	2	3
Residential Builder and Developer [Member] | Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	3	3
Residential Builder and Developer [Member] | Term Loans 2024 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	89
Residential Builder and Developer [Member] | Term Loans 2024 [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	89
Residential Builder and Developer [Member] | Term Loans 2023 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	511	531
Residential Builder and Developer [Member] | Term Loans 2023 [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	509	530
Residential Builder and Developer [Member] | Term Loans 2023 [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	2	1
Residential Builder and Developer [Member] | Term Loans 2022 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	208	270
Residential Builder and Developer [Member] | Term Loans 2022 [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	187	252
Residential Builder and Developer [Member] | Term Loans 2022 [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	21	18
Residential Builder and Developer [Member] | Term Loans 2021 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	57	74
Residential Builder and Developer [Member] | Term Loans 2021 [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	34	41
Residential Builder and Developer [Member] | Term Loans 2021 [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	21	30
Residential Builder and Developer [Member] | Term Loans 2021 [Member] | Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	2	3
Residential Builder and Developer [Member] | Term Loans 2020 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	5	6
Residential Builder and Developer [Member] | Term Loans 2020 [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	5	6
Residential Builder and Developer [Member] | Term Loans 2019 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount		61
Residential Builder and Developer [Member] | Term Loans 2019 [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount		2
Residential Builder and Developer [Member] | Term Loans 2019 [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount		59
Residential Builder and Developer [Member] | Term Loans Prior Period [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	61	12
Gross charge-offs	1
Residential Builder and Developer [Member] | Term Loans Prior Period [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	14	12
Residential Builder and Developer [Member] | Term Loans Prior Period [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	46
Residential Builder and Developer [Member] | Term Loans Prior Period [Member] | Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1
Other Commercial Construction [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	6,213	6,653
Gross charge-offs	11
Other Commercial Construction [Member] | Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	45	32
Gross charge-offs	2
Other Commercial Construction [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	3,745	4,066
Other Commercial Construction [Member] | Pass [Member] | Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	45	30
Other Commercial Construction [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	2,327	2,416
Other Commercial Construction [Member] | Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	141	171
Other Commercial Construction [Member] | Criticized Nonaccrual [Member] | Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount		2
Other Commercial Construction [Member] | Term Loans 2024 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	27
Other Commercial Construction [Member] | Term Loans 2024 [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	27
Other Commercial Construction [Member] | Term Loans 2023 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,065	866
Other Commercial Construction [Member] | Term Loans 2023 [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	990	813
Other Commercial Construction [Member] | Term Loans 2023 [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	75	53
Other Commercial Construction [Member] | Term Loans 2022 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,780	1,771
Gross charge-offs	2
Other Commercial Construction [Member] | Term Loans 2022 [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,231	1,366
Other Commercial Construction [Member] | Term Loans 2022 [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	538	391
Other Commercial Construction [Member] | Term Loans 2022 [Member] | Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	11	14
Other Commercial Construction [Member] | Term Loans 2021 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,060	1,051
Other Commercial Construction [Member] | Term Loans 2021 [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	590	651
Other Commercial Construction [Member] | Term Loans 2021 [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	460	390
Other Commercial Construction [Member] | Term Loans 2021 [Member] | Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	10	10
Other Commercial Construction [Member] | Term Loans 2020 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	885	1,110
Other Commercial Construction [Member] | Term Loans 2020 [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	273	373
Other Commercial Construction [Member] | Term Loans 2020 [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	567	691
Other Commercial Construction [Member] | Term Loans 2020 [Member] | Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	45	46
Other Commercial Construction [Member] | Term Loans 2019 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount		1,261
Other Commercial Construction [Member] | Term Loans 2019 [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount		646
Other Commercial Construction [Member] | Term Loans 2019 [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount		565
Other Commercial Construction [Member] | Term Loans 2019 [Member] | Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount		50
Other Commercial Construction [Member] | Term Loans Prior Period [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,351	562
Gross charge-offs	7
Other Commercial Construction [Member] | Term Loans Prior Period [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	589	187
Other Commercial Construction [Member] | Term Loans Prior Period [Member] | Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	687	326
Other Commercial Construction [Member] | Term Loans Prior Period [Member] | Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	$ 75	$ 49

Loans and Leases and the Allo_7

Loans and Leases and the Allowance for Credit Losses - Summary of loans in Accrual and Nonaccrual Status (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	$ 1,410	$ 1,724
Accruing Loans Past Due 90 Days or More	297	339
Nonaccrual	2,302	2,166
Loans and leases, net of unearned discount	134,973	134,068
Gross charge-offs	163
Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	29,937	29,237
Gross charge-offs	68
Revolving Loans Converted to Term Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,595	1,619
Gross charge-offs	1
Residential [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	627	763
Accruing Loans Past Due 90 Days or More	245	295
Nonaccrual	202	215
Loans and leases, net of unearned discount	22,192	22,353
Gross charge-offs	1
Residential [Member] | Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Nonaccrual	1	1
Loans and leases, net of unearned discount	94	96
Residential Limited Documentation [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	30	31
Nonaccrual	53	55
Loans and leases, net of unearned discount	884	911
Home Equity Lines and Loans [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	34	40
Nonaccrual	87	81
Loans and leases, net of unearned discount	4,558	4,649
Gross charge-offs	1
Home Equity Lines and Loans [Member] | Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Nonaccrual	1	3
Loans and leases, net of unearned discount	2,973	3,025
Home Equity Lines and Loans [Member] | Revolving Loans Converted to Term Loans [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	31	37
Nonaccrual	81	73
Loans and leases, net of unearned discount	1,468	1,501
Gross charge-offs	1
Recreational Finance [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	71	87
Nonaccrual	30	36
Loans and leases, net of unearned discount	10,654	10,058
Gross charge-offs	25
Automobile [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	43	60
Nonaccrual	13	14
Loans and leases, net of unearned discount	4,308	3,992
Gross charge-offs	8
Other [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	20	30
Accruing Loans Past Due 90 Days or More	8	7
Nonaccrual	54	52
Loans and leases, net of unearned discount	2,064	2,092
Gross charge-offs	25
Other [Member] | Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	12	20
Accruing Loans Past Due 90 Days or More	8	7
Nonaccrual	51	48
Loans and leases, net of unearned discount	1,449	1,467
Gross charge-offs	16
Other [Member] | Revolving Loans Converted to Term Loans [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	1	1
Loans and leases, net of unearned discount	2	4
Current [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	130,964	129,839
Current [Member] | Residential [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	21,118	21,080
Current [Member] | Residential [Member] | Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	93	95
Current [Member] | Residential Limited Documentation [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	801	825
Current [Member] | Home Equity Lines and Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	4,437	4,528
Current [Member] | Home Equity Lines and Loans [Member] | Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	2,972	3,022
Current [Member] | Home Equity Lines and Loans [Member] | Revolving Loans Converted to Term Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	1,356	1,391
Current [Member] | Recreational Finance [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	10,553	9,935
Current [Member] | Automobile [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	4,252	3,918
Current [Member] | Other [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	1,982	2,003
Current [Member] | Other [Member] | Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	1,378	1,392
Current [Member] | Other [Member] | Revolving Loans Converted to Term Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	1	3
Term Loans 2024 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	5,121
Gross charge-offs	1
Term Loans 2024 [Member] | Residential [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	478
Term Loans 2024 [Member] | Recreational Finance [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	1
Loans and leases, net of unearned discount	1,029
Term Loans 2024 [Member] | Automobile [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	1
Loans and leases, net of unearned discount	685
Term Loans 2024 [Member] | Other [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	1
Nonaccrual	1
Loans and leases, net of unearned discount	71
Gross charge-offs	1
Term Loans 2024 [Member] | Current [Member] | Residential [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	478
Term Loans 2024 [Member] | Current [Member] | Recreational Finance [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	1,028
Term Loans 2024 [Member] | Current [Member] | Automobile [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	684
Term Loans 2024 [Member] | Current [Member] | Other [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	69
Term Loans 2023 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	17,431	18,423
Gross charge-offs	15
Term Loans 2023 [Member] | Residential [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	6	18
Accruing Loans Past Due 90 Days or More	2	1
Nonaccrual	1	1
Loans and leases, net of unearned discount	1,508	1,746
Term Loans 2023 [Member] | Recreational Finance [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	11	11
Nonaccrual	4	3
Loans and leases, net of unearned discount	2,546	2,667
Gross charge-offs	3
Term Loans 2023 [Member] | Automobile [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	7	8
Nonaccrual	2	2
Loans and leases, net of unearned discount	1,035	1,073
Gross charge-offs	2
Term Loans 2023 [Member] | Other [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	1	3
Nonaccrual	1	2
Loans and leases, net of unearned discount	221	255
Gross charge-offs	3
Term Loans 2023 [Member] | Current [Member] | Residential [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	1,499	1,726
Term Loans 2023 [Member] | Current [Member] | Recreational Finance [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	2,531	2,653
Term Loans 2023 [Member] | Current [Member] | Automobile [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	1,026	1,063
Term Loans 2023 [Member] | Current [Member] | Other [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	219	250
Term Loans 2022 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	20,835	21,683
Gross charge-offs	21
Term Loans 2022 [Member] | Residential [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	107	120
Accruing Loans Past Due 90 Days or More	21	30
Nonaccrual	15	17
Loans and leases, net of unearned discount	4,810	4,876
Term Loans 2022 [Member] | Recreational Finance [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	12	16
Nonaccrual	6	5
Loans and leases, net of unearned discount	2,270	2,359
Gross charge-offs	5
Term Loans 2022 [Member] | Automobile [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	11	15
Nonaccrual	2	3
Loans and leases, net of unearned discount	1,017	1,114
Gross charge-offs	2
Term Loans 2022 [Member] | Other [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	3	3
Nonaccrual	1	1
Loans and leases, net of unearned discount	159	180
Gross charge-offs	3
Term Loans 2022 [Member] | Current [Member] | Residential [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	4,667	4,709
Term Loans 2022 [Member] | Current [Member] | Recreational Finance [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	2,252	2,338
Term Loans 2022 [Member] | Current [Member] | Automobile [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	1,004	1,096
Term Loans 2022 [Member] | Current [Member] | Other [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	155	176
Term Loans 2021 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	14,385	15,025
Gross charge-offs	13
Term Loans 2021 [Member] | Residential [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	62	88
Accruing Loans Past Due 90 Days or More	19	28
Nonaccrual	10	10
Loans and leases, net of unearned discount	3,808	3,858
Term Loans 2021 [Member] | Home Equity Lines and Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	2	2
Term Loans 2021 [Member] | Recreational Finance [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	14	19
Nonaccrual	6	8
Loans and leases, net of unearned discount	1,810	1,884
Gross charge-offs	6
Term Loans 2021 [Member] | Automobile [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	11	17
Nonaccrual	3	3
Loans and leases, net of unearned discount	956	1,067
Gross charge-offs	2
Term Loans 2021 [Member] | Other [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	1	2
Nonaccrual		1
Loans and leases, net of unearned discount	106	121
Gross charge-offs	1
Term Loans 2021 [Member] | Current [Member] | Residential [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	3,717	3,732
Term Loans 2021 [Member] | Current [Member] | Home Equity Lines and Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	2	2
Term Loans 2021 [Member] | Current [Member] | Recreational Finance [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	1,790	1,857
Term Loans 2021 [Member] | Current [Member] | Automobile [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	942	1,047
Term Loans 2021 [Member] | Current [Member] | Other [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	105	118
Term Loans 2020 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	10,088	10,555
Gross charge-offs	9
Term Loans 2020 [Member] | Residential [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	30	52
Accruing Loans Past Due 90 Days or More	15	17
Nonaccrual	2	3
Loans and leases, net of unearned discount	2,580	2,615
Term Loans 2020 [Member] | Home Equity Lines and Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	2	2
Term Loans 2020 [Member] | Recreational Finance [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	13	14
Nonaccrual	4	6
Loans and leases, net of unearned discount	1,250	1,306
Gross charge-offs	4
Term Loans 2020 [Member] | Automobile [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	6	9
Nonaccrual	2	2
Loans and leases, net of unearned discount	379	438
Gross charge-offs	1
Term Loans 2020 [Member] | Other [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	28	33
Gross charge-offs	1
Term Loans 2020 [Member] | Current [Member] | Residential [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	2,533	2,543
Term Loans 2020 [Member] | Current [Member] | Home Equity Lines and Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	2	2
Term Loans 2020 [Member] | Current [Member] | Recreational Finance [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	1,233	1,286
Term Loans 2020 [Member] | Current [Member] | Automobile [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	371	427
Term Loans 2020 [Member] | Current [Member] | Other [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	28	33
Term Loans 2019 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount		10,062
Term Loans 2019 [Member] | Residential [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due		28
Accruing Loans Past Due 90 Days or More		14
Nonaccrual		4
Loans and leases, net of unearned discount		1,261
Term Loans 2019 [Member] | Home Equity Lines and Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount		13
Term Loans 2019 [Member] | Recreational Finance [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due		11
Nonaccrual		5
Loans and leases, net of unearned discount		797
Term Loans 2019 [Member] | Automobile [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due		6
Nonaccrual		2
Loans and leases, net of unearned discount		206
Term Loans 2019 [Member] | Other [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount		13
Term Loans 2019 [Member] | Current [Member] | Residential [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans		1,215
Term Loans 2019 [Member] | Current [Member] | Home Equity Lines and Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans		13
Term Loans 2019 [Member] | Current [Member] | Recreational Finance [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans		781
Term Loans 2019 [Member] | Current [Member] | Automobile [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans		198
Term Loans 2019 [Member] | Current [Member] | Other [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans		13
Term Loans Prior Period [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	35,581	27,464
Gross charge-offs	35
Term Loans Prior Period [Member] | Residential [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	422	457
Accruing Loans Past Due 90 Days or More	188	205
Nonaccrual	173	179
Loans and leases, net of unearned discount	8,914	7,901
Gross charge-offs	1
Term Loans Prior Period [Member] | Residential Limited Documentation [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	30	31
Nonaccrual	53	55
Loans and leases, net of unearned discount	884	911
Term Loans Prior Period [Member] | Home Equity Lines and Loans [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	3	3
Nonaccrual	5	5
Loans and leases, net of unearned discount	113	106
Term Loans Prior Period [Member] | Recreational Finance [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	20	16
Nonaccrual	10	9
Loans and leases, net of unearned discount	1,749	1,045
Gross charge-offs	7
Term Loans Prior Period [Member] | Automobile [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	7	5
Nonaccrual	4	2
Loans and leases, net of unearned discount	236	94
Gross charge-offs	1
Term Loans Prior Period [Member] | Other [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	1	1
Loans and leases, net of unearned discount	28	19
Term Loans Prior Period [Member] | Current [Member] | Residential [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	8,131	7,060
Term Loans Prior Period [Member] | Current [Member] | Residential Limited Documentation [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	801	825
Term Loans Prior Period [Member] | Current [Member] | Home Equity Lines and Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	105	98
Term Loans Prior Period [Member] | Current [Member] | Recreational Finance [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	1,719	1,020
Term Loans Prior Period [Member] | Current [Member] | Automobile [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	225	87
Term Loans Prior Period [Member] | Current [Member] | Other [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 27	$ 18

Loans and Leases and the Allo_8

Loans and Leases and the Allowance for Credit Losses - Changes in Allowance for Credit Losses (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	$ 2,129	$ 1,925
Provision for credit losses	200	120
Net charge-offs
Charge-offs	(163)	(95)
Recoveries	25	25
Net charge-offs	(138)	(70)
Ending balance	2,191	1,975
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	620	568
Provision for credit losses	137	21
Net charge-offs
Charge-offs	(78)	(20)
Recoveries	5	10
Net charge-offs	(73)	(10)
Ending balance	684	579
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	764	611
Provision for credit losses	9	86
Net charge-offs
Charge-offs	(25)	(29)
Recoveries	6	1
Net charge-offs	(19)	(28)
Ending balance	754	669
Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	116	115
Provision for credit losses	2	(1)
Net charge-offs
Charge-offs	(1)	(2)
Recoveries	1	1
Net charge-offs		(1)
Ending balance	118	113
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	629	631
Provision for credit losses	52	14
Net charge-offs
Charge-offs	(59)	(44)
Recoveries	13	13
Net charge-offs	(46)	(31)
Ending balance	$ 635	$ 614

Loans and Leases and the Allo_9

Loans and Leases and the Allowance for Credit Losses - Loan and Leases Considered Nonaccrual and Interest Income Recognized on Loans (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Jan. 01, 2024	Jan. 01, 2023
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	$ 1,232	$ 986
Amortized Cost without Allowance	1,070	1,571
Total	2,302	2,557
Amortized Cost			$ 2,166	$ 2,439
Interest Income Recognized	13	17
Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	590	227
Amortized Cost without Allowance	274	342
Total	864	569
Amortized Cost			670	504
Interest Income Recognized	2	3
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	379	364
Amortized Cost without Allowance	476	966
Total	855	1,330
Amortized Cost			869	1,240
Interest Income Recognized	6	5
Residential Builder and Developer [Member]
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	3	3
Total	3	3
Amortized Cost			3	1
Other Commercial Construction [Member]
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	33	94
Amortized Cost without Allowance	108	49
Total	141	143
Amortized Cost			171	125
Interest Income Recognized		2
Residential [Member]
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	82	125
Amortized Cost without Allowance	120	129
Total	202	254
Amortized Cost			215	272
Interest Income Recognized	3	5
Residential Limited Documentation [Member]
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	18	40
Amortized Cost without Allowance	35	29
Total	53	69
Amortized Cost			55	78
Interest Income Recognized	1
Home Equity Lines and Loans [Member]
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	48	39
Amortized Cost without Allowance	39	42
Total	87	81
Amortized Cost			81	85
Interest Income Recognized	1	2
Recreational Finance [Member]
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	18	24
Amortized Cost without Allowance	12	10
Total	30	34
Amortized Cost			36	45
Automobile [Member]
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	7	23
Amortized Cost without Allowance	6	4
Total	13	27
Amortized Cost			14	40
Other [Member]
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	54	47
Total	$ 54	$ 47
Amortized Cost			$ 52	$ 49

Loans and Leases and the All_10

Loans and Leases and the Allowance for Credit Losses - Loan Modification Activities to Borrowers Experiencing Financial Difficulty on Financing Receivables (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring	$ 638	$ 304
Percent of total loan class	0.47%	0.23%
Payment Deferral [Member]
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring	$ 634	$ 302
Combination of Modification Types [Member]
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring	4	2
Commercial and Industrial [Member]
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring	$ 184	$ 70
Percent of total loan class	0.32%	0.13%
Commercial and Industrial [Member] | Payment Deferral [Member]
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring	$ 184	$ 70
Commercial Real Estate [Member]
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring	$ 270	$ 94
Percent of total loan class	1.07%	0.35%
Commercial Real Estate [Member] | Payment Deferral [Member]
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring	$ 267	$ 94
Commercial Real Estate [Member] | Combination of Modification Types [Member]
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring	3
Residential Builder and Developer [Member]
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring	$ 2	$ 8
Percent of total loan class	0.18%	0.64%
Residential Builder and Developer [Member] | Payment Deferral [Member]
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring	$ 2	$ 8
Other Commercial Construction [Member]
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring	$ 131	$ 92
Percent of total loan class	2.11%	1.39%
Other Commercial Construction [Member] | Payment Deferral [Member]
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring	$ 131	$ 92
Residential [Member]
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring	$ 49	$ 35
Percent of total loan class	0.22%	0.15%
Residential [Member] | Payment Deferral [Member]
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring	$ 48	$ 33
Residential [Member] | Combination of Modification Types [Member]
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring	1	2
Residential Limited Documentation [Member]
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring	$ 2	$ 5
Percent of total loan class	0.17%	0.51%
Residential Limited Documentation [Member] | Payment Deferral [Member]
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring	$ 2	$ 5

Loans and Leases and the All_11

Loans and Leases and the Allowance for Credit Losses - Loan Modification Activities to Borrowers Experiencing Financial Difficulty on Financing Receivables (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring	$ 638	$ 304
Guaranteed by Government-Related Entities [Member]
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring	44	23
Unfunded Commitments to Extend Credit [Member]
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring	$ 29	$ 11

Loans and Leases and the All_12

Loans and Leases and the Allowance for Credit Losses - Summary of Payment Status of Loans Modified (Detail) $ in Millions	Mar. 31, 2024 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	$ 1,693
30-89 Days Past Due	121
Past Due 90 Days or More	64
Total	1,878
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	310
30-89 Days Past Due	7
Past Due 90 Days or More	10
Total	327
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	715
30-89 Days Past Due	33
Past Due 90 Days or More	24
Total	772
Residential Builder and Developer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	14
30-89 Days Past Due	39
Total	53
Other Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	534
30-89 Days Past Due	5
Total	539
Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	112
30-89 Days Past Due	35
Past Due 90 Days or More	30
Total	177
Residential Limited Documentation [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	6
30-89 Days Past Due	2
Total	8
Home Equity Lines and Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	2
Total	$ 2

Loans and Leases and the All_13

Loans and Leases and the Allowance for Credit Losses - Summary of Payment Status of Loans Modified (Parenthetical) (Detail) $ in Millions	Mar. 31, 2024 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	$ 121
Past Due 90 Days or More	64
Guaranteed by Government-Related Entities [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	30
Past Due 90 Days or More	$ 27

Borrowings - Schedule of Borrow

Borrowings - Schedule of Borrowings (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Short-term borrowings
Federal funds purchased and repurchased agreements	$ 295	$ 316
FHLB advances	4,500	5,000
Total short-term borrowings	4,795	5,316
Long-term borrowings
Senior notes	3,743	3,741
FHLB Advances	2,005	5
Subordinated notes	866	873
Asset-backed notes	934	474
Other	10	10
Total long-term borrowings	11,450	8,201
M&T [Member]
Long-term borrowings
Senior notes	3,276	2,482
Subordinated notes	75	76
Junior subordinated debentures	$ 541	$ 540

Borrowings - Additional Informa

Borrowings - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended
	Mar. 31, 2024	Feb. 29, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Senior notes	$ 3,743		$ 3,741
Description of variable rate basis	SOFR	SOFR
Advances from FHLB	$ 4,500		5,000
Asset-backed notes	934		474
Short-term borrowings	4,795		5,316
Long-term borrowings	11,450		8,201
FHLB Advances	2,005		$ 5
Equipment Finance Loan [Member]
Debt Instrument [Line Items]
Asset-backed notes	$ 511
Weighted average interest rate	5.29%
6.082% Fixed Rate Senior Notes Due To Mature In March 2032 [Member]
Debt Instrument [Line Items]
Senior notes	$ 850
Senior notes maturity date	Mar. 31, 2032
Interest rate of debt instrument	6.082%
Variable interest rate of debt instrument	2.26%
FHLB of New York [Member]
Debt Instrument [Line Items]
Senior notes maturity date		Feb. 28, 2025
Variable interest rate of debt instrument		25%
Advances from FHLB		$ 2,000
Available line of credit	$ 14,600
FRB of New York [Member]
Debt Instrument [Line Items]
Available line of credit	$ 18,400

Shareholders' Equity - Addition

Shareholders' Equity - Additional Information (Detail) - $ / shares	Mar. 31, 2024	Dec. 31, 2023
Equity [Abstract]
Preferred stock, shares authorized	20,000,000	20,000,000
Preferred stock, par value	$ 1	$ 1

Shareholders' Equity - Issued a

Shareholders' Equity - Issued and Outstanding Preferred Stock (Detail) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Class of Stock [Line Items]
Preferred stock, shares issued	10,000,000	10,000,000
Carrying Value	$ 2,011	$ 2,011

Shareholders' Equity - Issued_2

Shareholders' Equity - Issued and Outstanding Preferred Stock (Parenthetical) (Detail) - $ / shares	Mar. 31, 2024	Dec. 31, 2023
Class of Stock [Line Items]
Preferred stock, liquidation preference per share	$ 25	$ 25

Revenue from Contracts with C_3

Revenue from Contracts with Customers - Additional Information (Detail1)	Mar. 31, 2024
Maximum [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2024-04-01
Disaggregation Of Revenue [Line Items]
Period of satisfaction of contract with customer	1 year

Revenue from Contracts with C_4

Revenue from Contracts with Customers - Additional Information (Detail) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Disaggregation Of Revenue [Line Items]
Uncollected amounts receivable	$ 63	$ 68
Accrued interest and other liabilities [Member]
Disaggregation Of Revenue [Line Items]
Deferred revenue	$ 52	$ 54

Revenue from Contracts with C_5

Revenue from Contracts with Customers - Summary of Sources of Noninterest Income that are Subject to Revenue Recognition Accounting Guidance (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Disaggregation Of Revenue [Line Items]
Brokerage services income	$ 29	$ 24
Other revenues from operations:
Total other income	580	587
Service Charges on Deposit Accounts [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	124	113
Trust Income [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	160	194
ASU 2014-09 [Member]
Disaggregation Of Revenue [Line Items]
Brokerage services income	29	24
Other revenues from operations:
Merchant discount and credit card interchange fees	37	37
Other	17	15
Total other income	367	383
ASU 2014-09 [Member] | Service Charges on Deposit Accounts [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	124	113
ASU 2014-09 [Member] | Trust Income [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	160	194
ASU 2014-09 [Member] | Commercial Bank [Member]
Disaggregation Of Revenue [Line Items]
Brokerage services income	2	2
Other revenues from operations:
Merchant discount and credit card interchange fees	17	17
Other	8	6
Total other income	68	59
ASU 2014-09 [Member] | Commercial Bank [Member] | Service Charges on Deposit Accounts [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	40	34
ASU 2014-09 [Member] | Commercial Bank [Member] | Trust Income [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	1
ASU 2014-09 [Member] | Retail Bank [Member]
Other revenues from operations:
Merchant discount and credit card interchange fees	20	20
Other	7	8
Total other income	111	107
ASU 2014-09 [Member] | Retail Bank [Member] | Service Charges on Deposit Accounts [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	84	79
ASU 2014-09 [Member] | Institutional Services and Wealth Management [ Member]
Disaggregation Of Revenue [Line Items]
Brokerage services income	27	22
Other revenues from operations:
Other	2	1
Total other income	188	217
ASU 2014-09 [Member] | Institutional Services and Wealth Management [ Member] | Trust Income [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	$ 159	$ 194

Pension Plans and Other Postr_3

Pension Plans and Other Postretirement Benefits - Net Periodic Defined Benefit Cost for Defined Benefit Plans (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2	$ 3
Interest cost on projected benefit obligation	29	29
Expected return on plan assets	(51)	(51)
Amortization of net actuarial gain		(1)
Net periodic benefit	$ (20)	$ (20)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Noninterest Expense	Other Noninterest Expense
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost on projected benefit obligation	$ 1	$ 1
Amortization of net actuarial gain	$ (1)	$ (1)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Noninterest Expense	Other Noninterest Expense

Pension Plans and Other Postr_4

Pension Plans and Other Postretirement Benefits - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Retirement Benefits [Abstract]
Defined contribution pension and retirement savings plans total expense	$ 45	$ 44

Earnings Per Common Share - Com

Earnings Per Common Share - Computations of Basic Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Income available to common shareholders:
Net Income (Loss)	$ 531	$ 702
Less: Preferred stock dividends	(25)	(25)
Net income available to common equity	506	677
Less: Income attributable to unvested stock-based compensation awards	(1)	(1)
Net income available to common shareholders	$ 505	$ 676
Weighted-average shares outstanding:
Common shares outstanding (including common stock issuable) and unvested stock-based compensation awards	166,738	168,010
Less: Unvested stock-based compensation awards	(278)	(278)
Weighted-average shares outstanding	166,460	167,732
Basic earnings per common share	$ 3.04	$ 4.03

Earnings Per Common Share - C_2

Earnings Per Common Share - Computations of Diluted Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Earnings Per Share [Abstract]
Net income available to common equity	$ 506	$ 677
Less: Income attributable to unvested stock-based compensation awards	(1)	(1)
Net income available to common shareholders	$ 505	$ 676
Adjusted weighted-average shares outstanding:
Common shares outstanding (including common stock issuable) and unvested stock-based compensation awards	166,738	168,010
Less: Unvested stock-based compensation awards	(278)	(278)
Plus: Incremental shares from assumed conversion of stock-based compensation awards	624	678
Adjusted weighted-average shares outstanding	167,084	168,410
Diluted earnings per common share	$ 3.02	$ 4.01

Earnings Per Common Share - Add

Earnings Per Common Share - Additional Information (Detail) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earnings per share	1,328,190	1,367,054

Comprehensive Income - Componen

Comprehensive Income - Components of Other Comprehensive Income (Loss) and Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Net Income (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, before tax	$ (616)	$ (1,066)
Unrealized holding gains (losses), net, before tax	(13)	89
Foreign currency translation adjustment, before tax	(2)	2
Unrealized losses on cash flow hedges	(243)	51
Total other comprehensive income (loss) before reclassifications, before tax	(258)	142
Losses realized in net income	1
Net yield adjustment from cash flow hedges currently in effect, before tax	87	59
Amortization of actuarial losses, before tax	(1)	(2)
Total other comprehensive income (loss), before tax	(171)	199
Ending balance, before tax	(787)	(867)
Beginning balance, tax	157	276
Unrealized holding gains (losses), net, tax	2	(24)
Foreign currency translation adjustment, tax		(1)
Unrealized losses on cash flow hedges, tax	60	(13)
Total other comprehensive income (loss) before reclassifications, tax	62	(38)
Net yield adjustment from cash flow hedges currently in effect, tax	(21)	(16)
Total other comprehensive income (loss), tax	41	(54)
Ending balance, tax	198	222
Beginning balance, net of tax	(459)	(790)
Unrealized holding gains (losses), net of tax	(11)	65
Foreign currency translation adjustments, net of tax	(2)	1
Unrealized losses on cash flow hedges, net of tax	(183)	38
Total other comprehensive income (loss) before reclassifications, net of tax	(196)	104
Losses realized in net income, net of tax	1
Net yield adjustment from cash flow hedges currently in effect, net of tax	66	43
Amortization of actuarial losses, net of tax	(1)	(2)
Total other comprehensive income (loss)	(130)	145
Ending balance, net of tax	(589)	(645)
Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, before tax	(203)	(336)
Unrealized losses on cash flow hedges	(243)	51
Total other comprehensive income (loss) before reclassifications, before tax	(243)	51
Net yield adjustment from cash flow hedges currently in effect, before tax	87	59
Total other comprehensive income (loss), before tax	(156)	110
Ending balance, before tax	(359)	(226)
Total other comprehensive income (loss)	(117)
Defined Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, before tax	(155)	(273)
Amortization of actuarial losses, before tax	(1)	(2)
Total other comprehensive income (loss), before tax	(1)	(2)
Ending balance, before tax	(156)	(275)
Total other comprehensive income (loss)	(1)
Other [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, before tax	(7)	(13)
Foreign currency translation adjustment, before tax	(2)	2
Total other comprehensive income (loss) before reclassifications, before tax	(2)	2
Total other comprehensive income (loss), before tax	(2)	2
Ending balance, before tax	(9)	(11)
Investment Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, before tax	(251)	(444)
Unrealized holding gains (losses), net, before tax	(13)	89
Total other comprehensive income (loss) before reclassifications, before tax	(13)	89
Losses realized in net income	1
Total other comprehensive income (loss), before tax	(12)	89
Ending balance, before tax	(263)	$ (355)
Total other comprehensive income (loss)	$ (10)

Comprehensive Income - Accumula

Comprehensive Income - Accumulated Other Comprehensive Income (Loss), Net (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 26,957	$ 25,318
Net loss during period	(130)	145
Ending balance	27,169	25,377
Investment Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(187)
Net loss during period	(10)
Ending balance	(197)
Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(151)
Net loss during period	(117)
Ending balance	(268)
Defined Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(115)
Net loss during period	(1)
Ending balance	(116)
Accumulated Other Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(6)
Net loss during period	(2)
Ending balance	(8)
Accumulated Other Comprehensive Income (Loss), Net [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(459)	(790)
Net loss during period	(130)
Ending balance	$ (589)	$ (645)

Derivative Financial Instrume_3

Derivative Financial Instruments - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Derivative [Line Items]
Notional amounts of derivative contracts entered into for trading account purposes	$ 27,277		$ 26,977
Unrealized net loss recognized in other comprehensive income related to cash flow hedges	359
Aggregate fair value of derivative financial instruments in asset position	232		179
Collateral relating to net asset positions	231		179
Clearinghouse Credit Facilities [Member]
Derivative [Line Items]
Amount of initial margin posted	146		129
Interest Income [Member]
Derivative [Line Items]
Changes in Cash Flow Hedges Derivative Instruments At Fair Value Net	87	$ 59
Interest Rate Swap Agreements [Member]
Derivative [Line Items]
Increase decrease in net interest income due to interest rate swap agreements	$ 100	$ 69
Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration]	Interest and Dividend Income, Operating	Interest and Dividend Income, Operating
Interest Rate Swap Agreements [Member] | Maturity Period 2024 [Member]
Derivative [Line Items]
Unrealized net loss recognized in other comprehensive income related to cash flow hedges	$ 1
Interest Rate Swap Agreements [Member] | Maturity Period 2025 [Member]
Derivative [Line Items]
Unrealized net loss recognized in other comprehensive income related to cash flow hedges	227
Interest Rate Swap Agreements [Member] | Maturity Period 2026 [Member]
Derivative [Line Items]
Unrealized net loss recognized in other comprehensive income related to cash flow hedges	129
Interest Rate Swap Agreements [Member] | Maturity Period 2027 [Member]
Derivative [Line Items]
Unrealized net loss recognized in other comprehensive income related to cash flow hedges	2
Interest Rate Contracts [Member]
Derivative [Line Items]
Notional amounts of derivative contracts entered into for trading account purposes	43,400		44,400
Foreign Exchange and Other Option and Futures Contracts [Member]
Derivative [Line Items]
Notional amounts of derivative contracts entered into for trading account purposes	$ 1,700		$ 1,500

Derivative Financial Instrume_4

Derivative Financial Instruments - Information about Interest Rate Swap Agreements (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Derivative [Line Items]
Notional Amount	$ 27,277	$ 26,977
Average Maturity (in years)	2 years 3 months 18 days	2 years 2 months 12 days
Estimated Fair Value Gain (Loss)	$ 2	$ 10
Interest Payments On Variable Rate Commercial Real Estate Loans [Member] | Cash Flow Hedges [Member]
Derivative [Line Items]
Notional Amount	$ 23,427	$ 23,977
Average Maturity (in years)	1 year 8 months 12 days	1 year 8 months 12 days
Weighted-Average Rate, Fixed	3.38%	3.45%
Weighted-Average Rate, Variable	5.33%	5.36%
Estimated Fair Value Gain (Loss)	$ 2	$ 11
Fixed Rate Long-Term Borrowings [Member] | Fair Value Hedges [Member]
Derivative [Line Items]
Notional Amount	$ 3,850	$ 3,000
Average Maturity (in years)	5 years 10 months 24 days	5 years 9 months 18 days
Weighted-Average Rate, Fixed	3.48%	3.45%
Weighted-Average Rate, Variable	5.51%	5.62%
Estimated Fair Value Gain (Loss)	$ 0	$ (1)

Derivative Financial Instrume_5

Derivative Financial Instruments - Information about Interest Rate Swap Agreements (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Derivative [Line Items]
Notional Amount	$ 27,277	$ 26,977
Fair Value Hedges [Member]
Derivative [Line Items]
Impact of estimated fair value gain (losses) on hedging instruments	104	43
Fair Value Hedges [Member] | Forward-Starting Interest Rate Swap Agreements [Member]
Derivative [Line Items]
Notional Amount	1,800	1,000
Cash Flow Hedges [Member]
Derivative [Line Items]
Impact of estimated fair value gain (losses) on hedging instruments	361	214
Cash Flow Hedges [Member] | Forward-Starting Interest Rate Swap Agreements [Member]
Derivative [Line Items]
Notional Amount	$ 6,000	$ 9,000

Derivative Financial Instrume_6

Derivative Financial Instruments - Information about Fair Values of Derivative Instruments in Consolidated Balance Sheet (Detail) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	$ 318	$ 324
Liability Derivatives, Fair Value	1,072	943
Derivatives Designated and Qualifying as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	14	18
Liability Derivatives, Fair Value	2	10
Fair Value Hedges [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	258	256
Liability Derivatives, Fair Value	1,032	898
Fair Value Hedges [Member] | Derivatives Not Designated and Qualifying as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	46	50
Liability Derivatives, Fair Value	38	35
Interest Rate Swap Agreements [Member] | Fair Value Hedges [Member] | Derivatives Designated and Qualifying as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	3	12
Liability Derivatives, Fair Value	1	2
Commitments to Sell Real Estate Loans [Member] | Fair Value Hedges [Member] | Derivatives Designated and Qualifying as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	11	6
Liability Derivatives, Fair Value	1	8
Commitments to Sell Real Estate Loans [Member] | Fair Value Hedges [Member] | Derivatives Not Designated and Qualifying as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	40	35
Liability Derivatives, Fair Value	2	3
Commitments to Originate Real Estate Loans for Sale [Member] | Fair Value Hedges [Member] | Derivatives Not Designated and Qualifying as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	6	15
Liability Derivatives, Fair Value	36	32
Interest Rate Contracts [Member] | Fair Value Hedges [Member] | Derivatives Not Designated and Qualifying as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	243	237
Liability Derivatives, Fair Value	1,019	879
Foreign Exchange and Other Option and Futures Contracts [Member] | Fair Value Hedges [Member] | Derivatives Not Designated and Qualifying as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	15	19
Liability Derivatives, Fair Value	$ 13	$ 19

Derivative Financial Instrume_7

Derivative Financial Instruments - Information about Fair Values of Derivative Instruments in Consolidated Balance Sheet (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Offsetting [Abstract]
Reduction in estimated fair value of interest rate contracts in asset position	$ 893	$ 783
Reduction in estimated fair value of interest rate contracts in liability position	$ 16	$ 32

Derivative Financial Instrume_8

Derivative Financial Instruments - Information about Fair Values of Derivative Instruments in Consolidated Statement of Income (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives not designated as hedging instruments, Derivatives	$ 7	$ 12
Interest Rate Swap Agreements [Member] | Fixed Rate Long-Term Borrowings [Member] | Derivatives Designated and Qualifying as Hedging Instruments [Member] | Fair Value Hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives in fair value hedging relationships, Derivative	$ (60)	$ 12
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Noninterest Expense	Other Noninterest Expense
Derivatives in fair value hedging relationships, Hedged item	$ 60	$ (12)
Interest Rate Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives not designated as hedging instruments, Derivatives	3	8
Foreign Exchange and Other Option and Futures Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives not designated as hedging instruments, Derivatives	$ 4	$ 4

Derivative Financial Instrume_9

Derivative Financial Instruments - Information about Hedged Items Included in Consolidated Balance Sheet (Detail) - Long-term Borrowings [Member] - Derivatives Designated and Qualifying as Hedging Instruments [Member] - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Carrying Amount [Member]
Derivatives, Fair Value [Line Items]
Hedged Item	$ 3,742	$ 2,954
Cumulative Amount of Fair Value Hedging Adjustment Increasing (Decreasing) the Carrying Amount [Member]
Derivatives, Fair Value [Line Items]
Hedged Item	$ (104)	$ (44)

Variable Interest Entities an_3

Variable Interest Entities and Asset Securitizations - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Loss on securitization of assets	$ 0
Other assets for its "investment" in the common securities recognized by the company of various trusts	22,000,000		$ 22,000,000
Total assets of partnerships in which the company invested	215,137,000,000		208,264,000,000
Investments which met the eligibility criteria	0
Maximum exposure to loss of investments in real estate partnerships	2,200,000,000
Loans	132,782,000,000		131,939,000,000
Asset-backed notes	934,000,000		474,000,000
Senior notes	3,743,000,000		3,741,000,000
Certificates issued	15,000,000
Tax benefit	133,000,000	$ 224,000,000
Renewable Energy Investments [Member]
Reduction to income tax expense	11,000,000	8,000,000
Asset-Backed Notes [Member]
Loans	$ 526,000,000
Loans and leases average rate	5.29%
Senior notes	$ 511,000,000
Asset-backed notes weighed average estimated life	2 years
Variable Interest Entity Primary Beneficiary [Member]
Total assets of partnerships in which the company invested	$ 9,800,000,000		$ 9,800,000,000
Variable Interest Entity Primary Beneficiary [Member] | Investments In Partnerships [Member]
Reduction to income tax expense	7,000,000	6,000,000
Investments amortized to income tax expense	$ 43,000,000	$ 41,000,000

Variable Interest Entities an_4

Variable Interest Entities and Asset Securitizations - Schedule of Carrying Amount of Investments In Tax Equity Partnerships and Related Future Funding Commitments (Details) - USD ($) $ in Millions		Mar. 31, 2024	Dec. 31, 2023
Accrued Interest and Other Assets [Member] | Affordable Housing Projects [member]
Investments in affordable housing projects:
Carrying amount	[1]	$ 1,323	$ 1,340
Accrued Interest and Other Assets [Member] | Renewable Energy [Member]
Investments in affordable housing projects:
Carrying amount	[1]	79	80
Accrued Interest and Other Assets [Member] | Other [Member]
Investments in affordable housing projects:
Carrying amount	[1]	40	41
Accrued Interest and Other Liabilities [Member] | Affordable Housing Projects [member]
Investments in affordable housing projects:
Amount of future funding commitments included in carrying amount	[2]	379	410
Contingent commitments		55	55
Accrued Interest and Other Liabilities [Member] | Renewable Energy [Member]
Investments in affordable housing projects:
Amount of future funding commitments included in carrying amount	[2]	$ 49	$ 31
[1] Included in "accrued interest and other assets" in the Consolidated Balance Sheet Included in "accrued interest and other liabilities" in the Consolidated Balance Sheet.

Variable Interest Entities an_5

Variable Interest Entities and Asset Securitizations - Schedule of Investments in Partnerships Qualifying for Proportional Amortization Method (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Schedule of Equity Method Investments [Line Items]
Tax benefit	$ 133	$ 224

Fair Value Measurements - Asset

Fair Value Measurements - Assets and Liabilities Measured at Estimated Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale	$ 12,134	$ 10,440
U.S. Treasury and Federal Agencies [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale	7,719	7,705
Commercial Mortgage-Backed Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale	1,343	416
Residential Mortgage-Backed Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale	2,910	2,154
Other Debt Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale	162	165
Fair Value Measurements, Recurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Trading account	99	106
Debt Securities, Available-for-Sale	12,134	10,440
Equity Securities, FV-NI, Current	356	268
Real estate loans held for sale	728	379
Other assets	318	324
Total assets	13,635	11,517
Other liabilities	1,072	943
Total liabilities	1,072	943
Fair Value Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Trading account	99	101
Equity Securities, FV-NI, Current	343	258
Total assets	442	359
Fair Value Measurements, Recurring [Member] | Significant Observable Inputs (Level 2) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Trading account		5
Debt Securities, Available-for-Sale	12,134	10,440
Equity Securities, FV-NI, Current	13	10
Real estate loans held for sale	728	379
Other assets	312	309
Total assets	13,187	11,143
Other liabilities	1,036	911
Total liabilities	1,036	911
Fair Value Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other assets	6	15
Total assets	6	15
Other liabilities	36	32
Total liabilities	36	32
Fair Value Measurements, Recurring [Member] | U.S. Treasury and Federal Agencies [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale	7,719	7,705
Fair Value Measurements, Recurring [Member] | U.S. Treasury and Federal Agencies [Member] | Significant Observable Inputs (Level 2) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale	7,719	7,705
Fair Value Measurements, Recurring [Member] | Commercial Mortgage-Backed Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale	1,343	416
Fair Value Measurements, Recurring [Member] | Commercial Mortgage-Backed Securities [Member] | Significant Observable Inputs (Level 2) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale	1,343	416
Fair Value Measurements, Recurring [Member] | Residential Mortgage-Backed Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale	2,910	2,154
Fair Value Measurements, Recurring [Member] | Residential Mortgage-Backed Securities [Member] | Significant Observable Inputs (Level 2) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale	2,910	2,154
Fair Value Measurements, Recurring [Member] | Other Debt Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale	162	165
Fair Value Measurements, Recurring [Member] | Other Debt Securities [Member] | Significant Observable Inputs (Level 2) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale	$ 162	$ 165

Fair Value Measurements - Ass_2

Fair Value Measurements - Assets and Liabilities Measured at Estimated Fair Value on Recurring Basis (Parenthetical) (Detail)	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Fair Value Disclosures [Abstract]
Weighted average commitment expirations, percentage	8%	5%

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Detail) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Weighted-average discount rates for fair value estimations	38%
Historical recovery rate of collateral values of consumer installment loans	46%
Minimum [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Discount rates for fair value estimations	10%
Maximum [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Discount rates for fair value estimations	90%
Significant Unobservable Inputs (Level 3) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Change in fair value of nonrecurring fair value measured loans for charge-offs and impairment reserves	$ 175,000,000	$ 69,000,000
Significant Unobservable Inputs (Level 3) [Member] | Residential Mortgage Loans [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Capitalized servicing rights, valuation allowance	0	0	$ 0
Fair Value, Measurements, Nonrecurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Loans measured at fair value on nonrecurring basis	1,000,000,000	670,000,000	923,000,000
Fair Value, Measurements, Nonrecurring [Member] | Significant Observable Inputs (Level 2) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Loans measured at fair value on nonrecurring basis	312,000,000	374,000,000	234,000,000
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Loans measured at fair value on nonrecurring basis	$ 707,000,000	$ 296,000,000	$ 689,000,000

Fair Value Measurements - Carry

Fair Value Measurements - Carrying Amounts and Estimated Fair Value for Certain Financial Instruments (Detail) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Financial assets:
Interest-bearing deposits at banks	$ 32,144	$ 28,069
Investment securities held to maturity	15,078	15,330
Equity and other securities	928	859
Loans and leases, net	132,782	131,939
Financial liabilities:
Noninterest-bearing deposits	50,578	49,294
Savings and interest-checking deposits	96,339	93,221
Time deposits	20,279	20,759
Short-term borrowings	295	316
Long-term borrowings	11,450	8,201
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets:
Cash and cash equivalents	1,396	1,668
Significant Observable Inputs (Level 2) [Member]
Financial assets:
Cash and cash equivalents	299	63
Interest-bearing deposits at banks	32,144	28,069
Investment securities held to maturity	13,821	14,262
Loans and leases, net	7,354	7,240
Financial liabilities:
Time deposits	20,236	20,715
Short-term borrowings	4,795	5,316
Long-term borrowings	11,370	8,107
Significant Unobservable Inputs (Level 3) [Member]
Financial assets:
Investment securities held to maturity	44	46
Loans and leases, net	122,417	121,898
Carrying Amount [Member]
Financial assets:
Cash and cash equivalents	1,695	1,731
Interest-bearing deposits at banks	32,144	28,069
Investment securities held to maturity	15,078	15,330
Loans and leases, net	132,782	131,939
Financial liabilities:
Time deposits	20,279	20,759
Short-term borrowings	4,795	5,316
Long-term borrowings	11,450	8,201
Cumulative Amount of Fair Value Hedging Adjustment Increasing (Decreasing) the Carrying Amount [Member]
Financial assets:
Cash and cash equivalents	1,695	1,731
Interest-bearing deposits at banks	32,144	28,069
Investment securities held to maturity	13,865	14,308
Loans and leases, net	129,771	129,138
Financial liabilities:
Time deposits	20,236	20,715
Short-term borrowings	4,795	5,316
Long-term borrowings	$ 11,370	$ 8,107

Commitments and Contingencies -

Commitments and Contingencies - Commitments and Contingent Liabilities Outstanding (Detail) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Commitments to extend credit
Commercial and industrial	$ 28,439	$ 28,566
Commercial real estate loans to be sold	451	916
Other commercial real estate	4,413	5,019
Residential real estate loans to be sold	211	163
Other residential real estate	393	331
Home equity lines of credit	8,080	8,109
Credit cards	5,651	5,578
Other	389	413
Standby letters of credit	2,230	2,289
Commercial letters of credit	56	62
Financial guarantees and indemnification contracts	4,129	4,036
Commitments to sell real estate loans	$ 1,329	$ 1,400

Commitments and Contingencies_2

Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions		3 Months Ended
	Feb. 29, 2024	Mar. 31, 2024	Dec. 31, 2023
Loss Contingencies [Line Items]
Commitments to extend credit to commercial customers		$ 12,400	$ 12,300
Maximum credit risk for recourse associated with loans sold under Federal National Mortgage Association Delegated Underwriting and Servicing program		4,000	3,900
Estimate assessed losses	$ 20,400	1,700
Estimate assessed losses increase	4,100
Estimated uninsured deposits	$ 16,300
Loss contingency expense amount		29	197
Accrued liability		226	$ 197
Minimum [Member]
Loss Contingencies [Line Items]
Range of reasonably possible losses		0
Maximum [Member]
Loss Contingencies [Line Items]
Range of reasonably possible losses		$ 25

Segment Information - Informati

Segment Information - Information about Company's Segments (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Net Income (Loss)	$ 531	$ 702
Total Average Assets	211,478	202,599
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues	2,260	2,405
Commercial Bank [Member]
Segment Reporting Information [Line Items]
Net Income (Loss)	201	333
Total Average Assets	81,083	79,034
Commercial Bank [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues	699	811
Commercial Bank [Member] | Intersegment Activity Eliminated in Consolidated Totals [Member]
Segment Reporting Information [Line Items]
Total Revenues	2	2
Retail Bank [Member]
Segment Reporting Information [Line Items]
Net Income (Loss)	446	452
Total Average Assets	52,232	51,293
Retail Bank [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues	1,268	1,234
Institutional Services and Wealth Management [ Member]
Segment Reporting Information [Line Items]
Net Income (Loss)	128	110
Total Average Assets	3,636	3,655
Institutional Services and Wealth Management [ Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues	377	390
Institutional Services and Wealth Management [ Member] | Intersegment Activity Eliminated in Consolidated Totals [Member]
Segment Reporting Information [Line Items]
Total Revenues	3	3
All Other [Member]
Segment Reporting Information [Line Items]
Net Income (Loss)	(244)	(193)
Total Average Assets	74,527	68,617
All Other [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues	(84)	(30)
All Other [Member] | Intersegment Activity Eliminated in Consolidated Totals [Member]
Segment Reporting Information [Line Items]
Total Revenues	$ (5)	$ (5)

Segment Information - Informa_2

Segment Information - Information about Company's Segments (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Taxable-equivalent adjustment	$ 12	$ 14

Relationship with BLG and Bay_2

Relationship with BLG and Bayview Financial - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]
Loan facility carrying amount	$ 11,450,000,000		$ 8,201,000,000
Bayview Lending Group [Member]
Schedule of Equity Method Investments [Line Items]
Carrying value of minority interest investment in Bayview Lending Group LLC	$ 0
Minority interest in Bayview Lending Group LLC	20%
Bayview Lending Group [Member] | Other Revenues From Operations [Member]
Schedule of Equity Method Investments [Line Items]
Income (loss) from equity method investments	$ 25,000,000	$ 20,000,000
Bayview Lending Group and Bayview Financial [Member]
Schedule of Equity Method Investments [Line Items]
Outstanding principal balances of mortgage servicing rights	1,100,000,000		1,200,000,000
Revenue from contract with customer	1,000,000	2,000,000
Bayview Financial [Member]
Schedule of Equity Method Investments [Line Items]
Outstanding principal balances of residential mortgage loans from Bayview Financial	112,000,000,000		115,300,000,000
Revenues from sub-servicing	32,000,000	$ 32,000,000
Investment securities in held-to-maturity portfolio securitized by Bayview Financial	41,000,000		$ 42,000,000
Bayview Financial [Member] | Syndicated Loan Facility [Member]
Schedule of Equity Method Investments [Line Items]
Loan facility carrying amount	3,700,000,000
Bayview Financial [Member] | Syndicated Loan Facility [Member] | M&T Bank [Member]
Schedule of Equity Method Investments [Line Items]
Loan facility carrying amount	$ 674,000,000