M&T Bank (MTB) 10-Q 5 Nov 24 2024 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2024	Nov. 01, 2024
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2024
Entity File Number	1-9861
Entity Registrant Name	M&T BANK CORPORATION
Entity Incorporation, State or Country Code	NY
Entity Tax Identification Number	16-0968385
Entity Address, Address Line One	One M&T Plaza
Entity Address, City or Town	Buffalo
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	14203
City Area Code	716
Local Phone Number	635-4000
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		165,921,158
Entity Central Index Key	0000036270
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q3
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Common Stock
Document Information [Line Items]
Title of 12(b) Security	Common Stock, $0.50 par value
Trading Symbol	MTB
Security Exchange Name	NYSE
Series H Preferred Stock
Document Information [Line Items]
Title of 12(b) Security	Perpetual Fixed-to-Floating RateNon-Cumulative Preferred Stock, Series H
Trading Symbol	MTBPrH
Security Exchange Name	NYSE
Series J Preferred Stock
Document Information [Line Items]
Title of 12(b) Security	Perpetual 7.500% Non-Cumulative Preferred Stock, Series J
Trading Symbol	MTBPrJ
Security Exchange Name	NYSE

Consolidated Balance Sheet (Una

Consolidated Balance Sheet (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Assets
Cash and due from banks	$ 2,216,000	$ 1,731,000
Interest-bearing deposits at banks	24,417,000	28,069,000
Trading account	102,000	106,000
Investment securities:
Available for sale (cost: $16,658 at September 30, 2024; $10,691 at December 31, 2023)	16,727,000	10,440,000
Held to maturity (fair value: $13,709 at September 30, 2024; $14,308 at December 31, 2023)	14,503,000	15,330,000
Equity and other securities (cost: $1,090 at September 30, 2024; $1,125 at December 31, 2023)	1,097,000	1,127,000
Total investment securities	32,327,000	26,897,000
Loans and leases, net of unearned discount of $1,043 at September 30, 2024 and $868 at December 31, 2023	135,920,000	134,068,000
Allowance for credit losses	(2,204,000)	(2,129,000)
Loans and leases, net	133,716,000	131,939,000
Premises and equipment	1,694,000	1,739,000
Goodwill	8,465,000	8,465,000
Core deposit and other intangible assets	107,000	147,000
Accrued interest and other assets	8,741,000	9,171,000
Total assets	211,785,000	208,264,000
Liabilities
Noninterest-bearing deposits	47,344,000	49,294,000
Savings and interest-checking deposits	100,698,000	93,221,000
Time deposits	16,512,000	20,759,000
Total deposits	164,554,000	163,274,000
Short-term borrowings	2,605,000	5,316,000
Accrued interest and other liabilities	4,167,000	4,516,000
Long-term borrowings	11,583,000	8,201,000
Total liabilities	182,909,000	181,307,000
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 December 31, 2023; Liquidation preference of $10,000 per share: 215,000 shares at September 30, 2024 and 140,000 shares at December 31, 2023; Liquidation preference of $25 per share: 10,000,000 shares at September 30, 2024 and December 31, 2023	2,394,000	2,011,000
Common stock, $0.50 par, 250,000,000 shares authorized, 179,436,779 shares issued at September 30, 2024 and December 31, 2023	90,000	90,000
Common stock issuable, 11,559 shares at September 30, 2024; 12,217 shares at December 31, 2023	1,000	1,000
Additional paid-in capital	9,986,000	10,020,000
Retained earnings	18,659,000	17,524,000
Accumulated other comprehensive income (loss), net	(27,000)	(459,000)
Treasury stock — common, at cost — 13,291,005 shares at September 30, 2024; 13,300,298 shares at December 31, 2023	(2,227,000)	(2,230,000)
Total shareholders’ equity	28,876,000	26,957,000
Total liabilities and shareholders’ equity	$ 211,785,000	$ 208,264,000

Consolidated Balance Sheet (U_2

Consolidated Balance Sheet (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Investment securities, available for sale, amortized cost	$ 16,658,000	$ 10,691,000
Investment securities, held to maturity, fair value	13,709,000	14,308,000
Equity and other securities, cost	1,090,000	1,125,000
Financing receivable, unamortized purchase discount	$ 1,043,000	$ 868,000
Preferred stock, par value	$ 1	$ 1
Preferred stock, shares authorized	20,000,000	20,000,000
Common stock par value (in USD per share)	$ 0.50	$ 0.50
Common stock authorized (in shares)	250,000,000	250,000,000
Common stock issued (in shares)	179,436,779	179,436,779
Common stock issuable (in shares)	11,559	12,217
Treasury stock (in shares)	13,291,005	13,300,298
Preferred Series E
Preferred stock, shares issued (in shares)	0	350,000
Preferred stock, liquidation preference per share (in USD per share)	$ 1,000	$ 1,000
Preferred stock, shares outstanding (in shares)	0	350,000
Series F, Series G, Series I And Series J Preferred Stock
Preferred stock, liquidation preference per share (in USD per share)	$ 10,000	$ 10,000
Preferred stock, shares outstanding (in shares)	215,000	140,000
Series H Preferred Stock
Preferred stock, shares issued (in shares)	10,000,000	10,000,000
Preferred stock, liquidation preference per share (in USD per share)	$ 25	$ 25
Preferred stock, shares outstanding (in shares)	10,000,000	10,000,000

Consolidated Statement of Incom

Consolidated Statement of Income (Unaudited) - USD ($) shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Interest income
Loans and leases, including fees	$ 2,153	$ 2,062	$ 6,378	$ 5,910
Investment securities:
Fully taxable	267	198	723	579
Exempt from federal taxes	16	17	48	50
Deposits at banks	348	363	1,167	942
Other	1	1	3	3
Total interest income	2,785	2,641	8,319	7,484
Interest expense
Savings and interest-checking deposits	655	494	1,888	1,140
Time deposits	180	202	622	441
Short-term borrowings	57	69	210	223
Long-term borrowings	167	101	475	287
Total interest expense	1,059	866	3,195	2,091
Net interest income	1,726	1,775	5,124	5,393
Provision for credit losses	120	150	470	420
Net interest income after provision for credit losses	1,606	1,625	4,654	4,973
Other income
Mortgage banking revenues	109	105	319	297
Service charges on deposit accounts	132	121	383	354
Trust income	170	155	500	521
Brokerage services income	32	27	91	76
Trading account and other non-hedging derivative gains	13	9	29	38
Gain (loss) on bank investment securities	(2)	0	(8)	0
Other revenues from operations	152	143	456	664
Total other income	606	560	1,770	1,950
Other expense
Salaries and employee benefits	775	727	2,372	2,273
Equipment and net occupancy	125	131	379	387
Outside data processing and software	123	111	367	323
Professional and other services	88	89	264	314
FDIC assessments	25	29	122	87
Advertising and marketing	27	23	74	82
Amortization of core deposit and other intangible assets	12	15	40	47
Other costs of operations	128	153	378	417
Total other expense	1,303	1,278	3,996	3,930
Income before taxes	909	907	2,428	2,993
Income taxes	188	217	521	734
Net income	721	690	1,907	2,259
Net income available to common shareholders
Net income available to common stockholders, basic	674	664	1,805	2,180
Net income available to common stockholders, diluted	$ 674	$ 664	$ 1,805	$ 2,180
Net income per common share
Earnings per share, basic (in USD per share)	$ 4.04	$ 4	$ 10.83	$ 13.09
Earnings per share, diluted (in USD per share)	$ 4.02	$ 3.98	$ 10.78	$ 13.05
Average common shares outstanding
Average common shares outstanding, basic (in shares)	166,671	165,909	166,694	166,488
Average common shares outstanding, diluted (in shares)	167,567	166,570	167,437	167,093

Consolidated Statement of Compr

Consolidated Statement of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 721	$ 690	$ 1,907	$ 2,259
Other comprehensive income (loss), net of tax and reclassification adjustments:
Net unrealized gains (losses) on investment securities	230	(3)	238	(2)
Cash flow hedges adjustments	291	(70)	196	(146)
Defined benefit plans liability adjustments	(1)	(1)	2	(4)
Other	4	(3)	(4)	0
Total other comprehensive income (loss)	524	(77)	432	(152)
Total comprehensive income	$ 1,245	$ 613	$ 2,339	$ 2,107

Consolidated Statement of Cash

Consolidated Statement of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Cash flows from operating activities
Net income	$ 1,907,000	$ 2,259,000
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	470,000	420,000
Depreciation and amortization of premises and equipment	235,000	227,000
Amortization of capitalized servicing rights	104,000	94,000
Amortization of core deposit and other intangible assets	40,000	47,000
Provision for deferred income taxes	(13,000)	(40,000)
Asset write-downs	7,000	3,000
Net gain on sales of assets	(3,000)	(244,000)
Net change in accrued interest receivable, payable	(149,000)	232,000
Net change in other accrued income and expense	166,000	208,000
Net change in loans originated for sale	(544,000)	(257,000)
Net change in trading account and other non-hedging derivative assets and liabilities	(286,000)	156,000
Net cash provided by operating activities	1,934,000	3,105,000
Cash flows from investing activities
Available for sale	58,000	0
Equity and other securities	436,000	809,000
Available for sale	5,255,000	513,000
Held to maturity	844,000	924,000
Available for sale	(11,156,000)	(344,000)
Held to maturity	0	(2,948,000)
Equity and other securities	(398,000)	(1,049,000)
Net increase in loans and leases	(1,740,000)	(850,000)
Net (increase) decrease in interest-bearing deposits at banks	3,652,000	(5,156,000)
Capital expenditures, net	(131,000)	(168,000)
Net decrease in loan servicing advances	186,000	305,000
Other, net	151,000	(593,000)
Net cash used by investing activities	(2,843,000)	(8,557,000)
Cash flows from financing activities
Net increase in deposits	1,277,000	608,000
Net increase (decrease) in short-term borrowings	(2,711,000)	3,176,000
Proceeds from long-term borrowings	4,003,000	4,032,000
Payments on long-term borrowings	(678,000)	(781,000)
Proceeds from issuance of Series J preferred stock	733,000	0
Redemption of Series E preferred stock	(350,000)	0
Purchases of treasury stock	(198,000)	(594,000)
Dividends paid — common	(671,000)	(652,000)
Dividends paid — preferred	(107,000)	(83,000)
Other, net	96,000	(5,000)
Net cash provided by financing activities	1,394,000	5,701,000
Net increase in cash, cash equivalents and restricted cash	485,000	249,000
Cash, cash equivalents and restricted cash at beginning of period	1,731,000	1,520,000
Cash, cash equivalents and restricted cash at end of period	2,216,000	1,769,000
Supplemental disclosure of cash flow information
Interest received during the period	8,323,000	7,429,000
Interest paid during the period	3,294,000	1,779,000
Income taxes paid during the period	240,000	431,000
Supplemental schedule of noncash investing and financing activities
Real estate acquired in settlement of loans	30,000	17,000
Additions to right-of-use assets under operating leases	$ 62,000	$ 88,000

Consolidated Statement of Chang

Consolidated Statement of Changes in Shareholders' Equity - USD ($)		Total	Series J Preferred Stock	Preferred Series E	Preferred Stock	Preferred Stock Series J Preferred Stock	Preferred Stock Preferred Series E	Common Stock	Common Stock Issuable	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss), Net	Treasury Stock
Beginning balance at Dec. 31, 2022		$ 25,318,000,000			$ 2,011,000,000			$ 90,000,000	$ 1,000,000	$ 10,002,000,000	$ 15,754,000,000	$ (790,000,000)	$ (1,750,000,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income		2,107,000,000									2,259,000,000
Preferred stock cash dividends	[1]	(75,000,000)									(75,000,000)
Purchases of treasury stock		(600,000,000)											(600,000,000)
Stock-based compensation transactions, net		99,000,000								10,000,000	(1,000,000)		90,000,000
Common stock cash dividends		(653,000,000)									(653,000,000)
Ending balance at Sep. 30, 2023		26,196,000,000			2,011,000,000			90,000,000	1,000,000	10,012,000,000	17,284,000,000	(942,000,000)	(2,260,000,000)
Beginning balance at Jun. 30, 2023		25,801,000,000			2,011,000,000			90,000,000	1,000,000	10,000,000,000	16,837,000,000	(865,000,000)	(2,273,000,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income		613,000,000									690,000,000
Preferred stock cash dividends	[1]	(25,000,000)									(25,000,000)
Stock-based compensation transactions, net		25,000,000								12,000,000			13,000,000
Common stock cash dividends		(218,000,000)									(218,000,000)
Ending balance at Sep. 30, 2023		26,196,000,000			2,011,000,000			90,000,000	1,000,000	10,012,000,000	17,284,000,000	(942,000,000)	(2,260,000,000)
Beginning balance at Dec. 31, 2023		26,957,000,000			2,011,000,000			90,000,000	1,000,000	10,020,000,000	17,524,000,000	(459,000,000)	(2,230,000,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income		2,339,000,000									1,907,000,000	432,000,000
Redemption of Series E preferred stock				$ (350,000,000)			$ (350,000,000)
Preferred stock cash dividends	[1]	(99,000,000)									(99,000,000)
Issuance of Series J preferred stock			$ 733,000,000			$ 733,000,000
Purchases of treasury stock		(200,000,000)											(200,000,000)
Stock-based compensation transactions, net		167,000,000								(34,000,000)	(2,000,000)		203,000,000
Common stock cash dividends		(671,000,000)									(671,000,000)
Ending balance at Sep. 30, 2024		28,876,000,000			2,394,000,000			90,000,000	1,000,000	9,986,000,000	18,659,000,000	(27,000,000)	(2,227,000,000)
Beginning balance at Jun. 30, 2024		28,424,000,000			2,744,000,000			90,000,000	1,000,000	9,976,000,000	18,211,000,000	(551,000,000)	(2,047,000,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income		1,245,000,000									721,000,000	524,000,000
Redemption of Series E preferred stock				$ (350,000,000)			$ (350,000,000)
Preferred stock cash dividends	[1]	(47,000,000)									(47,000,000)
Purchases of treasury stock		(200,000,000)											(200,000,000)
Stock-based compensation transactions, net		29,000,000								10,000,000	(1,000,000)		20,000,000
Common stock cash dividends		(225,000,000)									(225,000,000)
Ending balance at Sep. 30, 2024		$ 28,876,000,000			$ 2,394,000,000			$ 90,000,000	$ 1,000,000	$ 9,986,000,000	$ 18,659,000,000	$ (27,000,000)	$ (2,227,000,000)
[1] For the three-month and nine-month periods ended September 30, 2024, dividends per share for Preferred Series E were $23.50 and $62.575, respectively. For the three-month and nine-month periods ended September 30, 2023, dividends per share for Preferred Series E were $16.125 and $48.375, respectively. For the three-month and nine-month periods ended September 30, 2024 and 2023, dividends per preferred share were: Preferred Series F - $128.125 and $384.375, respectively; Preferred Series G - $125.00 and $375.00, respectively; Preferred Series H - $0.3516 and $1.0547, respectively; Preferred Series I - $87.50 and $262.50, respectively. For the three-month and nine-month periods ended September 30, 2024, dividends per share for Preferred Series J were $254.17.

Consolidated Statement of Cha_2

Consolidated Statement of Changes in Shareholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Common stock per share dividend amount (in USD per share)	$ 1.35	$ 1.30	$ 4	$ 3.90
Preferred Series E
Preferred stock per share dividend amount (in USD per share)	23.50	$ 16.125	62.575	$ 48.375
Preferred Series F
Preferred stock per share dividend amount (in USD per share)	128.125		384.375
Preferred Series G
Preferred stock per share dividend amount (in USD per share)	125		375
Series H Preferred Stock
Preferred stock per share dividend amount (in USD per share)	0.3516		1.0547
Preferred Series I
Preferred stock per share dividend amount (in USD per share)	87.50		262.50
Series J Preferred Stock
Preferred stock per share dividend amount (in USD per share)	$ 254.17		$ 254.17

Significant accounting policies

Significant accounting policies	9 Months Ended
	Sep. 30, 2024
Accounting Policies [Abstract]
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 M&T's 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 12, 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	9 Months Ended
	Sep. 30, 2024
Business Combinations [Abstract]
Divestiture	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 for the nine months ended September 30, 2023. Prior to the sale, the CIT business contributed $60 million to trust income in the nine months ended September 30, 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	9 Months Ended
	Sep. 30, 2024
Investments, Debt and Equity Securities [Abstract]
Investment securities	The amortized cost and estimated fair value of investment securities were as follows: (Dollars in millions) Amortized Gross Gross Estimated September 30, 2024 Investment securities available for sale: U.S. Treasury and federal agencies $ 7,824 $ 62 $ 26 $ 7,860 Mortgage-backed securities: Government issued or guaranteed: Commercial 3,125 55 3 3,177 Residential 5,606 60 77 5,589 Other debt securities 103 — 2 101 16,658 177 108 16,727 Investment securities held to maturity: U.S. Treasury and federal agencies 1,013 — 14 999 Obligations of states and political subdivisions 2,397 — 71 2,326 Mortgage-backed securities: Government issued or guaranteed: Commercial 2,038 — 81 1,957 Residential 9,016 13 646 8,383 Privately issued 38 8 3 43 Other debt securities 1 — — 1 14,503 21 815 13,709 Total debt securities $ 31,161 $ 198 $ 923 $ 30,436 Equity and other securities: Readily marketable equity — at fair value $ 250 $ 9 $ 2 $ 257 Other — at cost 840 — — 840 Total equity and other securities $ 1,090 $ 9 $ 2 $ 1,097 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 Gross realized losses from sales of investment securities totaled $13 million for the nine-month period ended September 30, 2024. There were no significant gross realized gains recognized for that same 2024 period. There were no significant gross realized gains or losses from sales of investment securities for the nine-month period ended September 30, 2023. Unrealized losses on equity securities are included in "gain (loss) on bank investment securities" in the Consolidated Statement of Income. At September 30, 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 $ 3,206 $ 3,187 Due after one year through five years 4,721 4,774 Due after five years through ten years — — Due after ten years — — 7,927 7,961 Mortgage-backed securities 8,731 8,766 $ 16,658 $ 16,727 Debt securities held to maturity: Due in one year or less $ 589 $ 585 Due after one year through five years 654 643 Due after five years through ten years 1,463 1,429 Due after ten years 705 669 3,411 3,326 Mortgage-backed securities 11,092 10,383 $ 14,503 $ 13,709 A summary of investment securities that as of September 30, 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 September 30, 2024 Investment securities available for sale: U.S. Treasury and federal agencies $ 125 $ — $ 3,069 $ 26 Mortgage-backed securities: Government issued or guaranteed: Commercial 395 2 128 1 Residential 227 — 1,760 77 Other debt securities — — 64 2 747 2 5,021 106 Investment securities held to maturity: U.S. Treasury and federal agencies — — 949 14 Obligations of states and political subdivisions 26 — 2,192 71 Mortgage-backed securities: Government issued or guaranteed: Commercial — — 1,957 81 Residential — — 7,318 646 Privately issued — — 31 3 26 — 12,447 815 Total $ 773 $ 2 $ 17,468 $ 921 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 The Company owned 3,600 individual debt securities with aggregate gross unrealized losses of $923 million at September 30, 2024. Based on a review of each of the securities in the investment securities portfolio at September 30, 2024, the Company concluded that it expected to recover the amortized cost basis of its investment. As of September 30, 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 September 30, 2024, the Company has not identified events or changes in circumstances which may have a significant adverse effect on the fair value of the $840 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 September 30, 2024 or December 31, 2023.

Loans and leases and the allowa

Loans and leases and the allowance for credit losses	9 Months Ended
	Sep. 30, 2024
Receivables [Abstract]
Loans and leases and the allowance for credit losses	Loans and leases and the allowance for credit losses A summary of current, past due and nonaccrual loans as of September 30, 2024 and December 31, 2023 follows: (Dollars in millions) Current 30-89 Days Accruing Loans Past Due 90 Days or More Nonaccrual Total September 30, 2024 Commercial and industrial $ 59,926 $ 265 $ 11 $ 810 $ 61,012 Real estate: Commercial (a) 21,560 231 2 578 22,371 Residential builder and developer 981 9 — 2 992 Other commercial construction 5,123 113 — 84 5,320 Residential (b) 21,042 667 268 219 22,196 Residential — limited documentation 737 29 — 57 823 Consumer: Home equity lines and loans 4,464 30 — 82 4,576 Recreational finance 11,621 90 — 28 11,739 Automobile 4,680 52 — 11 4,743 Other 2,066 20 7 55 2,148 Total $ 132,200 $ 1,506 $ 288 $ 1,926 $ 135,920 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 $716 million at September 30, 2024 and $189 million at December 31, 2023. (b) One-to-four family residential mortgage loans held for sale were $242 million at September 30, 2024 and $190 million at December 31, 2023. 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 designated as “criticized” and are ascribed a higher loss factor when determining the allowance for credit losses. Criticized loans may be designated 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 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 September 30, 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 and nine-month periods ended September 30, 2024 by origination year. Term Loans by Origination Year Revolving Revolving Loans Converted to Term Total (Dollars in millions) 2024 2023 2022 2021 2020 Prior Commercial and industrial: Pass $ 6,885 $ 7,018 $ 6,491 $ 3,825 $ 1,802 $ 5,440 $ 25,290 $ 78 $ 56,829 Criticized accrual 128 400 419 218 122 641 1,408 37 3,373 Criticized nonaccrual 7 56 82 46 67 274 260 18 810 Total commercial and industrial $ 7,020 $ 7,474 $ 6,992 $ 4,089 $ 1,991 $ 6,355 $ 26,958 $ 133 $ 61,012 Gross charge-offs three months ended September 30, 2024 $ 3 $ 10 $ 25 $ 4 $ 2 $ 8 $ 12 $ — $ 64 Gross charge-offs nine months ended September 30, 2024 $ 4 $ 24 $ 44 $ 19 $ 12 $ 22 $ 95 $ — $ 220 Real estate: Commercial: Pass $ 1,003 $ 1,648 $ 1,296 $ 1,190 $ 1,861 $ 10,308 $ 383 $ — $ 17,689 Criticized accrual 5 308 752 323 648 2,044 24 — 4,104 Criticized nonaccrual — 1 51 32 36 457 1 — 578 Total commercial real estate $ 1,008 $ 1,957 $ 2,099 $ 1,545 $ 2,545 $ 12,809 $ 408 $ — $ 22,371 Gross charge-offs three months ended September 30, 2024 $ — $ — $ — $ — $ — $ 24 $ — $ — $ 24 Gross charge-offs nine months ended September 30, 2024 $ — $ 4 $ — $ — $ 5 $ 67 $ — $ — $ 76 Residential builder and developer: Pass $ 333 $ 323 $ 78 $ 19 $ 4 $ 11 $ 101 $ — $ 869 Criticized accrual 9 43 46 6 — 16 1 — 121 Criticized nonaccrual — — — 1 — 1 — — 2 Total residential builder and developer $ 342 $ 366 $ 124 $ 26 $ 4 $ 28 $ 102 $ — $ 992 Gross charge-offs three months ended September 30, 2024 $ — $ — $ — $ — $ — $ — $ — $ — $ — Gross charge-offs nine months ended September 30, 2024 $ — $ — $ — $ — $ — $ 2 $ — $ — $ 2 Other commercial construction: Pass $ 68 $ 1,290 $ 1,213 $ 283 $ 161 $ 339 $ 46 $ — $ 3,400 Criticized accrual 19 87 673 454 311 284 8 — 1,836 Criticized nonaccrual — — 5 9 49 21 — — 84 Total other commercial construction $ 87 $ 1,377 $ 1,891 $ 746 $ 521 $ 644 $ 54 $ — $ 5,320 Gross charge-offs three months ended September 30, 2024 $ — $ — $ — $ — $ — $ — $ — $ — $ — Gross charge-offs nine months ended September 30, 2024 $ — $ — $ 2 $ — $ — $ 10 $ 2 $ — $ 14 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 September 30, 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 and nine-month periods ended September 30, 2024 by origination year follows: Term Loans by Origination Year Revolving Revolving Loans Converted to Term Total (Dollars in millions) 2024 2023 2022 2021 2020 Prior Residential: Current $ 1,550 $ 1,415 $ 4,481 $ 3,559 $ 2,427 $ 7,510 $ 100 $ — $ 21,042 30-89 days past due 17 10 114 76 35 415 — — 667 Accruing loans past due 90 days or more — 8 29 29 18 184 — — 268 Nonaccrual — 2 27 15 3 169 3 — 219 Total residential $ 1,567 $ 1,435 $ 4,651 $ 3,679 $ 2,483 $ 8,278 $ 103 $ — $ 22,196 Gross charge-offs three months ended September 30, 2024 $ — $ — $ — $ — $ — $ 1 $ — $ — $ 1 Gross charge-offs nine months ended September 30, 2024 $ — $ — $ — $ — $ — $ 4 $ — $ — $ 4 Residential - limited documentation: Current $ — $ — $ — $ — $ — $ 737 $ — $ — $ 737 30-89 days past due — — — — — 29 — — 29 Accruing loans past due 90 days or more — — — — — — — — — Nonaccrual — — — — — 57 — — 57 Total residential - limited documentation $ — $ — $ — $ — $ — $ 823 $ — $ — $ 823 Gross charge-offs three months ended September 30, 2024 $ — $ — $ — $ — $ — $ — $ — $ — $ — Gross charge-offs nine months ended September 30, 2024 $ — $ — $ — $ — $ — $ — $ — $ — $ — Consumer: Home equity lines and loans: Current $ — $ — $ — $ 2 $ 2 $ 95 $ 3,038 $ 1,327 $ 4,464 30-89 days past due — — — — — 2 — 28 30 Accruing loans past due 90 days or more — — — — — — — — — Nonaccrual — — — — — 3 — 79 82 Total home equity lines and loans $ — $ — $ — $ 2 $ 2 $ 100 $ 3,038 $ 1,434 $ 4,576 Gross charge-offs three months ended September 30, 2024 $ — $ — $ — $ — $ — $ — $ — $ 1 $ 1 Gross charge-offs nine months ended September 30, 2024 $ — $ — $ — $ — $ — $ — $ — $ 3 $ 3 Recreational finance: Current $ 3,153 $ 2,219 $ 2,026 $ 1,609 $ 1,102 $ 1,512 $ — $ — $ 11,621 30-89 days past due 8 17 14 16 14 21 — — 90 Accruing loans past due 90 days or more — — — — — — — — — Nonaccrual 1 5 5 5 4 8 — — 28 Total recreational finance $ 3,162 $ 2,241 $ 2,045 $ 1,630 $ 1,120 $ 1,541 $ — $ — $ 11,739 Gross charge-offs three months ended September 30, 2024 $ 3 $ 5 $ 6 $ 4 $ 4 $ 6 $ — $ — $ 28 Gross charge-offs nine months ended September 30, 2024 $ 4 $ 12 $ 17 $ 14 $ 11 $ 18 $ — $ — $ 76 Automobile: Current $ 1,875 $ 856 $ 826 $ 729 $ 267 $ 127 $ — $ — $ 4,680 30-89 days past due 7 11 13 11 5 5 — — 52 Accruing loans past due 90 days or more — — — — — — — — — Nonaccrual 1 2 2 3 1 2 — — 11 Total automobile $ 1,883 $ 869 $ 841 $ 743 $ 273 $ 134 $ — $ — $ 4,743 Gross charge-offs three months ended September 30, 2024 $ 1 $ 2 $ 2 $ 1 $ 1 $ — $ — $ — $ 7 Gross charge-offs nine months ended September 30, 2024 $ 1 $ 6 $ 6 $ 5 $ 2 $ 2 $ — $ — $ 22 Other: Current $ 205 $ 168 $ 121 $ 81 $ 18 $ 20 $ 1,452 $ 1 $ 2,066 30-89 days past due 3 2 2 1 — — 11 1 20 Accruing loans past due 90 days or more — — — — — — 7 — 7 Nonaccrual 2 1 1 — — — 51 — 55 Total other $ 210 $ 171 $ 124 $ 82 $ 18 $ 20 $ 1,521 $ 2 $ 2,148 Gross charge-offs three months ended September 30, 2024 $ 5 $ 3 $ 2 $ 1 $ — $ — $ 18 $ — $ 29 Gross charge-offs nine months ended September 30, 2024 $ 10 $ 9 $ 7 $ 4 $ 1 $ 2 $ 47 $ — $ 80 Total loans and leases at September 30, 2024 $ 15,279 $ 15,890 $ 18,767 $ 12,542 $ 8,957 $ 30,732 $ 32,184 $ 1,569 $ 135,920 Total gross charge-offs for the three months ended September 30, 2024 $ 12 $ 20 $ 35 $ 10 $ 7 $ 39 $ 30 $ 1 $ 154 Total gross charge-offs for the nine months ended September 30, 2024 $ 19 $ 55 $ 76 $ 42 $ 31 $ 127 $ 144 $ 3 $ 497 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 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 developer: Pass $ 530 $ 252 $ 41 $ 6 $ 2 $ 12 $ 116 $ — $ 959 Criticized accrual 1 18 30 — 59 — 3 — 111 Criticized nonaccrual — — 3 — — — — — 3 Total residential builder and developer $ 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 construction $ 866 $ 1,771 $ 1,051 $ 1,110 $ 1,261 $ 562 $ 32 $ — $ 6,653 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 Total (Dollars in millions) 2023 2022 2021 2020 2019 Prior 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 90 days or more 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 documentation: Current $ — $ — $ — $ — $ — $ 825 $ — $ — $ 825 30-89 days past due — — — — — 31 — — 31 Accruing loans past due 90 days or more — — — — — — — — — Nonaccrual — — — — — 55 — — 55 Total residential - limited documentation $ — $ — $ — $ — $ — $ 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 90 days or more — — — — — — — — — Nonaccrual — — — — — 5 3 73 81 Total home equity lines and loans $ — $ — $ 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 90 days or more — — — — — — — — — 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 90 days or more — — — — — — — — — 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 90 days or more — — — — — — 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 December 31, 2023 $ 18,423 $ 21,683 $ 15,025 $ 10,555 $ 10,062 $ 27,464 $ 29,237 $ 1,619 $ 134,068 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 September 30, 2024 and 2023 were as follows: Commercial and Industrial Real Estate (Dollars in millions) Commercial Residential Consumer Total Three Months Ended September 30, 2024 Beginning balance $ 790 $ 658 $ 110 $ 646 $ 2,204 Provision for credit losses 52 1 (5) 72 120 Net charge-offs: Charge-offs (64) (24) (1) (65) (154) Recoveries 14 4 1 15 34 Net charge-offs (50) (20) — (50) (120) Ending balance $ 792 $ 639 $ 105 $ 668 $ 2,204 Three Months Ended September 30, 2023 Beginning balance $ 583 $ 694 $ 118 $ 603 $ 1,998 Provision for credit losses 40 79 (3) 34 150 Net charge-offs: Charge-offs (26) (52) (1) (43) (122) Recoveries 7 5 — 14 26 Net charge-offs (19) (47) (1) (29) (96) Ending balance $ 604 $ 726 $ 114 $ 608 $ 2,052 Changes in the allowance for credit losses for the nine months ended September 30, 2024 and 2023 were as follows: Commercial and Industrial Real Estate (Dollars in millions) Commercial Residential Consumer Total Nine Months Ended September 30, 2024 Beginning balance $ 620 $ 764 $ 116 $ 629 $ 2,129 Provision for credit losses 365 (60) (11) 176 470 Net charge-offs: Charge-offs (220) (92) (4) (181) (497) Recoveries 27 27 4 44 102 Net charge-offs (193) (65) — (137) (395) Ending balance $ 792 $ 639 $ 105 $ 668 $ 2,204 Nine Months Ended September 30, 2023 Beginning balance $ 568 $ 611 $ 115 $ 631 $ 1,925 Provision for credit losses 73 287 (1) 61 420 Net charge-offs: Charge-offs (70) (180) (4) (125) (379) Recoveries 33 8 4 41 86 Net charge-offs (37) (172) — (84) (293) Ending balance $ 604 $ 726 $ 114 $ 608 $ 2,052 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 September 30, 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. 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 designating 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. Other consumer loans are generally charged-off when the loans are 91 to 180 days past due, depending on whether the loan is collateralized and the status of repossession activities with respect to such collateral. 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 September 30, 2024 and December 31, 2023. 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 and nine-month periods ended September 30, 2024 and 2023 follows: Amortized Cost with Allowance Amortized Cost without Allowance Total Amortized Cost Interest Income Recognized (Dollars in millions) September 30, 2024 June 30, 2024 January 1, 2024 Three Months Nine Months Commercial and industrial $ 610 $ 200 $ 810 $ 805 $ 670 $ 5 $ 14 Real estate: Commercial 348 230 578 707 869 5 31 Residential builder and developer 2 — 2 2 3 1 1 Other commercial construction 21 63 84 77 171 — 3 Residential 113 106 219 205 215 4 10 Residential — limited documentation 22 35 57 55 55 — 1 Consumer: Home equity lines and loans 39 43 82 79 81 2 4 Recreational finance 17 11 28 25 36 — — Automobile 8 3 11 11 14 — — Other 55 — 55 58 52 — — Total $ 1,235 $ 691 $ 1,926 $ 2,024 $ 2,166 $ 17 $ 64 (Dollars in millions) September 30, 2023 June 30, 2023 January 1, 2023 Three Months Nine Months Commercial and industrial $ 366 $ 300 $ 666 $ 607 $ 504 $ 7 $ 13 Real estate: Commercial 417 638 1,055 1,192 1,240 9 18 Residential builder and developer 3 — 3 1 1 — — Other commercial construction 4 132 136 146 125 — 2 Residential 91 150 241 239 272 3 12 Residential — limited documentation 22 40 62 67 78 1 1 Consumer: Home equity lines and loans 48 30 78 77 85 2 6 Recreational finance 21 10 31 32 45 — — Automobile 12 4 16 22 40 — — Other 54 — 54 53 49 — — Total $ 1,038 $ 1,304 $ 2,342 $ 2,436 $ 2,439 $ 22 $ 52 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 extensions of maturity dates 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 tables that follow summarize the Company’s loan modification activities to borrowers experiencing financial difficulty for the three-month and nine-month periods ended September 30, 2024 and 2023: Amortized cost at September 30, 2024 (Dollars in millions) Term Extension Other (a) Combination of Modification Types (b) Total (c) (d) Percent of Total Loan Class Three Months Ended September 30, 2024 Commercial and industrial $ 92 $ 23 $ 2 $ 117 .19 % Real estate: Commercial 163 1 — 164 .73 Residential builder and developer 2 — — 2 .17 Other commercial construction 2 — — 2 .03 Residential 34 4 4 42 .19 Residential — limited documentation 2 1 — 3 .41 Consumer: Home equity lines and loans — — — — — Recreational finance — — — — — Automobile — — — — — Other — — — — — Total $ 295 $ 29 $ 6 $ 330 .24 % Nine Months Ended September 30, 2024 Commercial and industrial $ 190 $ 78 $ 2 $ 270 .44 % Real estate: Commercial 420 1 4 425 1.90 Residential builder and developer 13 — — 13 1.27 Other commercial construction 139 — — 139 2.62 Residential 123 10 6 139 .63 Residential — limited documentation 5 2 — 7 .86 Consumer: Home equity lines and loans 1 — 1 2 .04 Recreational finance 1 — — 1 .01 Automobile — — — — — Other — — — — — Total $ 892 $ 91 $ 13 $ 996 .73 % _______________________________________________________________ (a) Predominantly payment deferrals. (b) Predominantly term extensions combined with interest rate reductions. (c) Includes approximately $33 million and $117 million of loans guaranteed by government-related entities (predominantly first lien residential mortgage loans) for the three-month and nine-month periods ended September 30, 2024, respectively. (d) Excludes unfunded commitments to extend credit totaling $8 million and $43 million for the three-month and nine-month periods ended September 30, 2024, respectively. Amortized cost at September 30, 2023 (Dollars in millions) Term Extension Other (a) Combination of Modification Types (b) Total (c) (d) Percent of Total Loan Class Three Months Ended September 30, 2023 Commercial and industrial $ 40 $ — $ 1 $ 41 .07 % Real estate: Commercial 272 — 6 278 1.07 Residential builder and developer — — — — — Other commercial construction 216 — — 216 3.20 Residential 47 7 1 55 .24 Residential — limited documentation 1 1 — 2 .18 Consumer: Home equity lines and loans — — — — — Recreational finance — — — — — Automobile — — — — — Other — — — — — Total $ 576 $ 8 $ 8 $ 592 .45 % Nine Months Ended September 30, 2023 Commercial and industrial $ 115 $ 10 $ 2 $ 127 .23 % Real estate: Commercial 409 — 14 423 1.63 Residential builder and developer 70 1 — 71 6.42 Other commercial construction 432 — 8 440 6.54 Residential 104 17 4 125 .56 Residential — limited documentation 6 4 1 11 1.11 Consumer: Home equity lines and loans 1 — — 1 .02 Recreational finance — — — — — Automobile — — — — — Other — — — — — Total $ 1,137 $ 32 $ 29 $ 1,198 .91 % _______________________________________________________________ (a) Predominantly payment deferrals. (b) Predominantly term extensions combined with interest rate reductions. (c) Includes approximately $45 million and $92 million of loans guaranteed by government-related entities (predominantly first lien residential mortgage loans) for the three-month and nine-month periods ended September 30, 2023, respectively. (d) Excludes unfunded commitments to extend credit totaling $62 million and $138 million for the three-month and nine-month periods ended September 30, 2023, respectively. The financial effects of the modifications for the three-month and nine-month periods ended September 30, 2024 include an increase in the weighted-average remaining term for commercial and industrial loans of 1.3 years and 1.0 years, respectively, for commercial real estate loans, inclusive of residential builder and development loans and other commercial construction loans, of 0.6 years and 0.8 years, respectively, and for residential real estate loans of 9.1 years and 9.9 years, respectively. The financial effects of the modifications for the three-month and nine-month periods ended September 30, 2023 include an increase in the weighted-average remaining term for commercial and industrial loans of 1.3 years and 1.2 years, respectively, for commercial real estate loans, inclusive of residential builder and development loans and other commercial construction loans, of 1.3 years and 1.2 years, respectively, and for residential real estate loans of 11.5 years and 10.1 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. The following table summarizes the payment status, at September 30, 2024, of loans that were modified during the twelve-month period ended September 30, 2024. Payment status at September 30, 2024 (amortized cost) (Dollars in millions) Current 30-89 Days Past Due Past Due 90 Days or More (a) Total Twelve Months Ended September 30, 2024 Commercial and industrial $ 308 $ 5 $ 4 $ 317 Real estate: Commercial 422 84 9 515 Residential builder and developer 13 1 — 14 Other commercial construction 141 74 — 215 Residential (b) 93 45 37 175 Residential — limited documentation 6 2 — 8 Consumer: Home equity lines and loans 2 — — 2 Recreational finance 1 — — 1 Automobile — — — — Other — — — — Total $ 986 $ 211 $ 50 $ 1,247 _______________________________________________________________ (a) Predominantly loan modifications with term extensions. (b) Includes loans guaranteed by government-related entities classified as 30 to 89 days past due of $39 million and as past due 90 days or more of $34 million. The following table summarizes the payment status, at September 30, 2023, of loans that were modified during the nine-month period ended September 30, 2023. Payment status at September 30, 2023 (amortized cost) (Dollars in millions) Current 30-89 Days Past Due Past Due 90 Days or More (a) Total Nine Months Ended September 30, 2023 Commercial and industrial $ 109 $ 4 $ 14 $ 127 Real estate: Commercial 406 17 — 423 Residential builder and developer 71 — — 71 Other commercial construction 440 — — 440 Residential (b) 79 34 12 125 Residential — limited documentation 8 1 2 11 Consumer: Home equity lines and loans 1 — — 1 Recreational finance — — — — Automobile — — — — Other — — — — Total $ 1,114 $ 56 $ 28 $ 1,198 ___________________________________________________________ (a) Predominantly loan modifications with term extensions. (b) Includes loans guaranteed by government-related entities classified as 30 to 89 days past due of $28 million and as past due 90 days or more of $11 million. The amount of foreclosed property held by the Company, predominantly consisting of residential real estate, was $37 million and $39 million at September 30, 2024 and December 31, 2023, respectively. There were $166 million and $170 million at September 30, 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 September 30, 2024, approximately 35% were government guaranteed. At September 30, 2024, approximately $19.9 billion of commercial and industrial loans, including leases, $15.5 billion of commercial real estate loans, $18.5 billion of one-to-four family residential real estate loans, $2.7 billion of home equity loans and lines of credit and $12.7 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. 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	9 Months Ended
	Sep. 30, 2024
Debt Disclosure [Abstract]
Borrowings	Borrowings (Dollars in millions) September 30, 2024 December 31, 2023 Short-term borrowings Federal funds purchased and repurchase agreements $ 105 $ 316 FHLB advances 2,500 5,000 Total short-term borrowings $ 2,605 $ 5,316 Long-term borrowings Senior notes — M&T $ 3,371 $ 2,482 Senior notes — M&T Bank 3,744 3,741 FHLB advances 2,004 5 Subordinated notes — M&T 75 76 Subordinated notes — M&T Bank 482 873 Junior subordinated debentures — M&T 543 540 Asset-backed notes 1,354 474 Other 10 10 Total long-term borrowings $ 11,583 $ 8,201 In August 2024, a subsidiary of M&T Bank issued asset-backed notes secured by equipment finance loans and leases. A total of $650 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 4.87% at the time of securitization. Further information about this financing transaction is provided in note 12. 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 12. M&T Bank had secured borrowing facilities available with the FHLB of New York and the FRB of New York totaling approximately $15.8 billion and $23.8 billion, respectively, at September 30, 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.

Shareholders' Equity

Shareholders' Equity	9 Months Ended
	Sep. 30, 2024
Equity [Abstract]
Shareholders' Equity	M&T is authorized to issue 20,000,000 shares of preferred stock with a $1.00 par value per share. Preferred shares outstanding rank senior to common shares both as to dividends and liquidation preference, but have no general voting rights. On May 13, 2024, M&T issued 75,000 shares of Perpetual 7.5% Non-Cumulative Preferred Stock, Series J, with a liquidation preference of $10,000 per share. On August 15, 2024, M&T redeemed all outstanding shares of its Perpetual Fixed-to-Floating Rate Non-Cumulative Preferred Stock, Series E. Issued and outstanding preferred stock of M&T as of September 30, 2024 and December 31, 2023 is presented in the following table. September 30, 2024 December 31, 2023 (Dollars in millions) Shares Carrying Value Shares Carrying Value Series E (a) Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock $1,000 liquidation preference per share — $ — 350,000 $ 350 Series F (b) Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock $10,000 liquidation preference per share 50,000 500 50,000 500 Series G (c) Fixed-Rate Reset Non-Cumulative Perpetual Preferred Stock $10,000 liquidation preference per share 40,000 400 40,000 400 Series H (d) Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock $25 liquidation preference per share 10,000,000 261 10,000,000 261 Series I (e) Fixed-Rate Reset Non-Cumulative Perpetual Preferred Stock $10,000 liquidation preference per share 50,000 500 50,000 500 Series J (f) Fixed-Rate Non-Cumulative Perpetual Preferred Stock $10,000 liquidation preference per share 75,000 733 — — _______________________________________________________________ (a) On August 15, 2024, M&T redeemed all outstanding shares of the Series E Preferred Stock. (b) Dividends, if declared, are paid semi-annually at a rate of 5.125% through October 31, 2026 and thereafter will be paid quarterly at a rate of the three-month SOFR plus 378 basis points. The shares are redeemable in whole or in part on or after November 1, 2026. Notwithstanding M&T’s option to redeem the shares, if an event occurs such that the shares no longer qualify as Tier 1 capital, M&T may redeem all of the shares within 90 days following that occurrence. (c) Dividends, if declared, were paid semi-annually at a rate of 5.0% through July 31, 2024. On August 1, 2024, the dividend rate reset at 7.246% and will reset at each subsequent five year anniversary date therefrom at a rate of the five-year U.S. Treasury rate plus 3.174%. The shares became redeemable in whole or in part on August 1, 2024. Notwithstanding M&T’s option to redeem the shares, if an event occurs such that the shares no longer qualify as Tier 1 capital, M&T may redeem all of the shares within 90 days following that occurrence. (d) Dividends, if declared, are paid quarterly at a rate of 5.625% through December 14, 2026 and thereafter will be paid quarterly at a rate of the three-month SOFR rate plus 428 basis points. The shares are redeemable in whole or in part on or after April 1, 2027. Notwithstanding M&T's option to redeem the shares, if an event occurs such that the shares no longer qualify as Tier 1 capital, M&T may redeem all of the shares within 90 days following that occurrence. (e) Dividends, if declared, are paid semi-annually at a rate of 3.5% through August 31, 2026. On September 1, 2026 and at each subsequent five year anniversary date therefrom the dividend rate will reset at a rate of the five-year U.S. Treasury rate plus 2.679%. The shares are redeemable in whole or in part on or after September 1, 2026. Notwithstanding M&T’s option to redeem the shares, if an event occurs such that the shares no longer qualify as Tier 1 capital, M&T may redeem all of the shares within 90 days following that occurrence. (f) Dividends, if declared, are paid quarterly at a rate of 7.5%. The shares are redeemable in whole or in part on or after June 15, 2029. Notwithstanding M&T’s option to redeem the shares, if an event occurs such that the shares no longer qualify as Tier 1 capital, M&T may redeem all of the shares within 90 days following that occurrence.

Revenue from contracts with cus

Revenue from contracts with customers	9 Months Ended
	Sep. 30, 2024
Revenue from Contract with Customer [Abstract]
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 September 30, 2024 and December 31, 2023, the Company had $69 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 September 30, 2024 and December 31, 2023, the Company had deferred revenue of $53 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 and nine-month periods ended September 30, 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 September 30, 2024 Classification in Consolidated Statement of Income Service charges on deposit accounts $ 40 $ 92 $ — $ 132 Trust income 1 — 169 170 Brokerage services income 2 — 30 32 Other revenues from operations: Merchant discount and credit card interchange fees 18 23 — 41 Other 8 8 3 19 $ 69 $ 123 $ 202 $ 394 Three Months Ended September 30, 2023 Classification in Consolidated Statement of Income Service charges on deposit accounts $ 38 $ 83 $ — $ 121 Trust income — — 155 155 Brokerage services income 1 — 26 27 Other revenues from operations: Merchant discount and credit card interchange fees 21 22 — 43 Other 7 7 — 14 $ 67 $ 112 $ 181 $ 360 (Dollars in millions) Commercial Bank Retail Bank Institutional Services and Wealth Management Total Nine Months Ended September 30, 2024 Classification in Consolidated Statement of Income Service charges on deposit accounts $ 120 $ 263 $ — $ 383 Trust income 3 — 497 500 Brokerage services income 5 — 86 91 Other revenues from operations: Merchant discount and credit card interchange fees 54 67 — 121 Other 23 23 8 54 $ 205 $ 353 $ 591 $ 1,149 Nine Months Ended September 30, 2023 Classification in Consolidated Statement of Income Service charges on deposit accounts $ 109 $ 245 $ — $ 354 Trust income 1 — 520 521 Brokerage services income 4 — 72 76 Other revenues from operations: Merchant discount and credit card interchange fees 57 65 — 122 Other 19 23 4 46 $ 190 $ 333 $ 596 $ 1,119

Pension plans and other postret

Pension plans and other postretirement benefits	9 Months Ended
	Sep. 30, 2024
Retirement Benefits [Abstract]
Pension plans and other postretirement benefits	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 Benefits Other Postretirement Benefits Three Months Ended September 30, (Dollars in millions) 2024 2023 2024 2023 Service cost $ 3 $ 3 $ — $ — Interest cost on projected benefit obligation 28 29 1 1 Expected return on plan assets (50) (50) — — Amortization of prior service credit — — (1) — Amortization of net actuarial gain — (1) (1) (1) Net periodic benefit $ (19) $ (19) $ (1) $ — Pension Benefits Other Postretirement Benefits Nine Months Ended September 30, (Dollars in millions) 2024 2023 2024 2023 Service cost $ 8 $ 9 $ 1 $ 1 Interest cost on projected benefit obligation 86 87 2 2 Expected return on plan assets (151) (151) — — Amortization of prior service credit — — (2) (1) Amortization of net actuarial gain (1) (2) (2) (2) Net periodic benefit $ (58) $ (57) $ (1) $ —

Earnings per common share

Earnings per common share	9 Months Ended
	Sep. 30, 2024
Earnings Per Share [Abstract]
Earnings per common share	The computations of basic earnings per common share follow: Three Months Ended September 30, Nine Months Ended September 30, (Dollars in millions, except per share, shares in thousands) 2024 2023 2024 2023 Income available to common shareholders: Net income $ 721 $ 690 $ 1,907 $ 2,259 Less: Preferred stock dividends (47) (25) (99) (75) Net income available to common equity 674 665 1,808 2,184 Less: Income attributable to unvested stock-based compensation awards — (1) (3) (4) Net income available to common shareholders $ 674 $ 664 $ 1,805 $ 2,180 Weighted-average shares outstanding: Common shares outstanding (including common stock issuable) and unvested stock-based compensation awards 167,011 166,217 167,010 166,787 Less: Unvested stock-based compensation awards (340) (308) (316) (299) Weighted-average shares outstanding 166,671 165,909 166,694 166,488 Basic earnings per common share $ 4.04 $ 4.00 $ 10.83 $ 13.09 The computations of diluted earnings per common share follow: Three Months Ended September 30, Nine Months Ended September 30, (Dollars in millions, except per share, shares in thousands) 2024 2023 2024 2023 Net income available to common equity $ 674 $ 665 $ 1,808 $ 2,184 Less: Income attributable to unvested stock-based compensation awards — (1) (3) (4) Net income available to common shareholders $ 674 $ 664 $ 1,805 $ 2,180 Adjusted weighted-average shares outstanding: Common shares outstanding (including common stock issuable) and unvested stock-based compensation awards 167,011 166,217 167,010 166,787 Less: Unvested stock-based compensation awards (340) (308) (316) (299) Plus: Incremental shares from assumed conversion of stock-based compensation awards 896 661 743 605 Adjusted weighted-average shares outstanding 167,567 166,570 167,437 167,093 Diluted earnings per common share $ 4.02 $ 3.98 $ 10.78 $ 13.05 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 490,695 common shares and 1,008,825 common shares during the three-month and nine-month periods ended September 30, 2024, respectively, and 1,745,348 and 1,800,385 common shares during the three-month and nine-month periods ended September 30, 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	9 Months Ended
	Sep. 30, 2024
Equity [Abstract]
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: (Dollars in millions) Investment Cash Flow Hedges Defined Benefit Plans Other Total Income Net Balance — January 1, 2024 $ (251) $ (203) $ (155) $ (7) $ (616) $ 157 $ (459) Other comprehensive income (loss) before reclassifications: Unrealized holding gains, net 307 — — — 307 (78) 229 Unrealized losses on cash flow hedges — (26) — — (26) 7 (19) Other — — — 3 3 (1) 2 Total other comprehensive income (loss) before reclassifications 307 (26) — 3 284 (72) 212 Amounts reclassified from accumulated other comprehensive income (loss) that (increase) decrease net income: Net losses realized in net income 13 — — — 13 (4) 9 Net yield adjustment from cash flow hedges currently in effect — 288 — — 288 (a) (73) 215 Amortization of prior service credit — — (2) — (2) (b) — (2) Amortization of actuarial gains — — (3) — (3) (b) 1 (2) Total other comprehensive income (loss) 320 262 (5) 3 580 (148) 432 Balance — September 30, 2024 $ 69 $ 59 $ (160) $ (4) $ (36) $ 9 $ (27) Balance — January 1, 2023 $ (444) $ (336) $ (273) $ (13) $ (1,066) $ 276 $ (790) Other comprehensive income (loss) before reclassifications: Unrealized holding losses, net (2) — — — (2) 1 (1) Unrealized losses on cash flow hedges — (366) — — (366) 91 (275) Total other comprehensive income (loss) before reclassifications (2) (366) — — (368) 92 (276) Amounts reclassified from accumulated other comprehensive income (loss) that (increase) decrease net income: Net yield adjustment from cash flow hedges currently in effect — 173 — — 173 (a) (44) 129 Amortization of prior service credit — — (1) — (1) (b) — (1) Amortization of actuarial gains — — (4) — (4) (b) — (4) Total other comprehensive income (loss) (2) (193) (5) — (200) 48 (152) Balance — September 30, 2023 $ (446) $ (529) $ (278) $ (13) $ (1,266) $ 324 $ (942) _______________________________________________________________ (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: (Dollars in millions) Investment Securities Cash Flow Hedges Defined Benefit Plans Other Total Balance — December 31, 2023 $ (187) $ (151) $ (115) $ (6) $ (459) Net gain (loss) during period 238 196 (4) 2 432 Balance — September 30, 2024 $ 51 $ 45 $ (119) $ (4) $ (27)

Derivative financial instrument

Derivative financial instruments	9 Months Ended
	Sep. 30, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
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 September 30, 2024. 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: Notional Weighted-Average Weighted- Average Rate Estimated Fair Value Gain (Loss) (a) (Dollars in millions) Fixed Variable September 30, 2024 Fair value hedges: Fixed rate long-term borrowings (b) (d) $ 3,850 5.4 3.48 % 5.06 % $ (8) Fixed rate investment securities available for sale (c) 15 0.3 4.84 4.86 — Cash flow hedges: Interest payments on variable rate commercial real estate and commercial 26,705 1.5 3.39 5.02 (30) Total $ 30,570 2.0 $ (38) December 31, 2023 Fair value hedges: Fixed rate long-term borrowings (b) (f) $ 3,000 5.8 3.45 % 5.62 % $ (1) Cash flow hedges: Interest payments on variable rate commercial real estate loans (b) (g) 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 gains of $15 million at September 30, 2024 and of losses of $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 gains of $89 million at September 30, 2024 and of losses of $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) Under the terms of these agreements, the Company receives settlement amounts at a variable rate and pays at a fixed rate. (d) Includes notional amount and terms of $1.9 billion of forward-starting interest rate swap agreements that become effective in 2025. (e) Includes notional amount and terms of $6.6 billion of forward-starting interest rate swap agreements that become effective in 2024, 2025 and 2026. (f) Includes notional amount and terms of $1.0 billion of forward-starting interest rate swap agreements that become effective in 2025. (g) 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. Changes in unrealized gains and losses as a result of those activities were not material in each of the three and nine months ended September 30, 2024 and 2023. Such changes are included in mortgage banking revenues and, in general are realized in subsequent periods as the related loans are sold and commitments satisfied. 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 $42.5 billion and $44.4 billion at September 30, 2024 and December 31, 2023, respectively. The notional amounts of foreign exchange and other option and futures contracts not designated as hedging instruments aggregated $1.4 billion and $1.5 billion at September 30, 2024 and December 31, 2023, respectively. 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 (Dollars in millions) September 30, December 31, September 30, December 31, Derivatives designated and qualifying as hedging instruments (a) Interest rate swap agreements $ — $ 12 $ 38 $ 2 Commitments to sell real estate loans 1 6 17 8 1 18 55 10 Derivatives not designated and qualifying as hedging instruments (a) Mortgage banking: Mortgage-related commitments to originate real estate loans for sale 29 15 21 32 Commitments to sell real estate loans 24 35 19 3 53 50 40 35 Other: Interest rate contracts (b) 218 237 571 879 Foreign exchange and other option and futures contracts 14 19 13 19 232 256 584 898 Total derivatives $ 286 $ 324 $ 679 $ 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 September 30, 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 $496 million and $783 million, respectively, as of each period end, and in a liability position of $51 million and $32 million, respectively. Amount of Gain (Loss) Recognized Three Months Ended September 30, 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) $ 130 $ (130) $ (61) $ 61 Fixed rate investment securities available for sale (b) — — Total $ 130 $ (130) $ (61) $ 61 Derivatives not designated as hedging instruments Interest rate contracts (c) $ 5 $ 6 Foreign exchange and other option and futures contracts (c) 5 4 Total $ 10 $ 10 Amount of Gain (Loss) Recognized Nine Months Ended September 30, 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) $ 52 $ (52) $ (95) $ 96 Fixed rate investment securities available for sale (b) — — Total $ 52 $ (52) $ (95) $ 96 Derivatives not designated as hedging instruments Interest rate contracts (c) $ 11 $ 25 Foreign exchange and other option and futures contracts (c) 13 11 Total $ 24 $ 36 _______________________________________________________________ (a) Reported as an adjustment to "interest expense" in the Consolidated Statement of Income. (b) Reported as an adjustment to "interest income" in the Consolidated Statement of Income. (c) 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 (Dollars in millions) September 30, December 31, 2023 September 30, December 31, 2023 Location in the Consolidated Balance Sheet of the Hedged Items in Fair Value Hedges Long-term borrowings $ 3,853 $ 2,954 $ 8 $ (44) Investment securities available for sale 391 — The net effect of interest rate swap agreements was to decrease net interest income by $115 million and $328 million during the three-month and nine-month periods ended September 30, 2024, respectively, and to decrease net interest income by $79 million and $211 million during the three-month and nine-month periods ended September 30, 2023, respectively. The amount of interest income recognized in the Consolidated Statement of Income associated with derivatives designated as cash flow hedges was a decrease 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 September 30, 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 at September 30, 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 $94 million at September 30, 2024 and $179 million at December 31, 2023. Counterparties posted collateral relating to those positions of $87 million at September 30, 2024 and $179 million at December 31, 2023. Interest rate swap agreements entered into with customers are subject to the Company’s credit risk standards and often contain collateral provisions.

Variable interest entities and

Variable interest entities and asset securitizations	9 Months Ended
	Sep. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Variable interest entities and asset securitizations	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 not 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. At September 30, 2024, the remaining balance of the loans and leases in trust was $418 million and the outstanding asset-backed notes issued to third party investors was $406 million. In August 2024, M&T Bank issued asset-backed notes secured by equipment finance loans and leases. Approximately $790 million of such loans were sold into a special purpose trust which in turn issued asset-backed notes to investors. The loans and leases continue to be serviced by the Company. A total of $650 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 4.87% at the time of securitization. Additionally, $140 million of credit enhancement in the form of equity interest and reserve accounts were provided by the Company. As a result of the retention of credit risk 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. At September 30, 2024, the remaining balance of the loans and leases in trust was $742 million and the outstanding asset-backed notes issued to third party investors was $614 million. 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 September 30, 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 $10.0 billion and $9.8 billion at September 30, 2024 and December 31, 2023, respectively. 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) September 30, 2024 December 31, 2023 Affordable housing projects: Carrying amount (a) $ 1,365 $ 1,340 Amount of future funding commitments included in carrying amount (b) 431 410 Contingent commitments 65 55 Renewable energy: Carrying amount (a) 71 80 Amount of future funding commitments included in carrying amount (b) — 31 Other: Carrying amount (a) 38 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. The reduction to income tax expense recognized from the Company's investments in partnerships accounted for using the proportional amortization method was $10 million (net of $47 million of investment amortization) and $6 million (net of $46 million of investment amortization) for the three months ended September 30, 2024 and 2023, respectively, and $25 million (net of $135 million of investment amortization) and $22 million (net of $128 million of investment amortization) for the nine months ended September 30, 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 September 30, 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 $8 million and $28 million for the three-month and nine-month periods ended September 30, 2024, respectively, and $10 million and $22 million for the three-month and nine-month periods ended September 30, 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 September 30, 2024 was $2.1 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	9 Months Ended
	Sep. 30, 2024
Fair Value Disclosures [Abstract]
Fair value measurements	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 September 30, 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. 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 Company's available-for-sale investment securities have generally 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. The following tables present assets and liabilities at September 30, 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) September 30, 2024 Trading account $ 102 $ 102 $ — $ — Investment securities available for sale: U.S. Treasury and federal agencies 7,860 — 7,860 — Mortgage-backed securities: Government issued or guaranteed: Commercial 3,177 — 3,177 — Residential 5,589 — 5,589 — Other debt securities 101 — 101 — 16,727 — 16,727 — Equity securities 257 244 13 — Real estate loans held for sale 958 — 958 — Other assets (b) 286 — 257 29 Total assets $ 18,330 $ 346 $ 17,955 $ 29 Other liabilities (b) $ 679 $ — $ 658 $ 21 Total liabilities $ 679 $ — $ 658 $ 21 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 6% at September 30, 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). 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 37% at September 30, 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 September 30, 2024 was 43%. 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 $805 million at September 30, 2024 ($159 million and $646 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 $804 million at September 30, 2023 ($316 million and $488 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 September 30, 2024 were decreases of $81 million and $204 million for the three-month and nine-month periods ended September 30, 2024, respectively. Changes in the fair value recognized for partial charge-offs of loans and loan impairment reserves on loans held by the Company on September 30, 2023 were decreases of $116 million and $269 million for the three-month and nine-month periods ended September 30, 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 September 30, 2024 and 2023. Changes in fair value recognized for those foreclosed assets held by the Company were not material during the three-month and nine-month periods ended September 30, 2024 and 2023. 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 September 30, 2024, December 31, 2023 and September 30, 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 table: (Dollars in millions) Carrying Amount Estimated Fair Value Level 1 Level 2 Level 3 September 30, 2024 Financial assets: Cash and cash equivalents $ 2,216 $ 2,216 $ 2,107 $ 109 $ — Interest-bearing deposits at banks 24,417 24,417 — 24,417 — Investment securities held to maturity 14,503 13,709 — 13,666 43 Loans and leases, net 133,716 132,086 — 7,581 124,505 Financial liabilities: Time deposits 16,512 16,514 — 16,514 — Short-term borrowings 2,605 2,605 — 2,605 — Long-term borrowings 11,583 11,705 — 11,705 — 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 — 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	9 Months Ended
	Sep. 30, 2024
Commitments and Contingencies Disclosure [Abstract]
Commitments and contingencies	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. (Dollars in millions) September 30, December 31, Commitments to extend credit: Commercial and industrial $ 30,210 $ 28,566 Commercial real estate loans to be sold 825 916 Other commercial real estate 3,153 5,019 Residential real estate loans to be sold 258 163 Other residential real estate 744 331 Home equity lines of credit 7,950 8,109 Credit cards 5,889 5,578 Other 271 413 Standby letters of credit 2,267 2,289 Commercial letters of credit 70 62 Financial guarantees and indemnification contracts 4,090 4,036 Commitments to sell real estate loans 1,940 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 $12.7 billion and $12.3 billion at September 30, 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. 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 $3.9 billion at each of September 30, 2024 and December 31, 2023. At September 30, 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 September 30, 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 September 30, 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 2024, the FDIC notified member banks that the loss estimate attributable to certain failed banks had increased. The Company recorded FDIC special assessment expense of $34 million in the Consolidated Statement of Income for the nine months ended September 30, 2024 in addition to the $197 million recorded in the fourth quarter of 2023. The FDIC has indicated that the amount of the special assessment will be adjusted as its loss estimates change.

Segment information

Segment information	9 Months Ended
	Sep. 30, 2024
Segment Reporting [Abstract]
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 Company's 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 September 30, 2024 2023 (Dollars in millions) Total Inter- segment Revenues Net Income (Loss) Total Average Assets Total Inter- segment Revenues Net Income (Loss) Total Average Assets Commercial Bank $ 723 $ — $ 239 $ 80,434 $ 738 $ 1 $ 251 $ 80,473 Retail Bank 1,292 — 446 53,128 1,307 — 473 51,024 Institutional Services and Wealth 389 4 137 3,898 363 3 120 3,664 All Other (72) (4) (101) 72,121 (73) (4) (154) 70,630 Total $ 2,332 $ — $ 721 $ 209,581 $ 2,335 $ — $ 690 $ 205,791 Nine Months Ended September 30, 2024 2023 (Dollars in millions) Total Revenues(a) Inter- segment Revenues Net Income (Loss) Total Average Assets Total Revenues(a) Inter- segment Revenues Net Income (Loss) Total Average Assets Commercial Bank $ 2,139 $ 4 $ 645 $ 80,903 $ 2,308 $ 4 $ 819 $ 80,169 Retail Bank 3,854 — 1,364 52,771 3,837 — 1,400 51,124 Institutional Services and Wealth 1,167 10 409 3,735 1,344 9 515 3,680 All Other (266) (14) (511) 73,599 (146) (13) (475) 69,293 Total $ 6,894 $ — $ 1,907 $ 211,008 $ 7,343 $ — $ 2,259 $ 204,266 _______________________________________________________________ (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 $13 million and $15 million for the three-month periods ended September 30, 2024 and 2023, respectively, and $38 million and $41 million for the nine-month periods ended September 30, 2024 and 2023, respectively, and is eliminated in "All Other" total revenues.

Relationship with Bayview Lendi

Relationship with Bayview Lending Group LLC and Bayview Financial Holdings, L.P.	9 Months Ended
	Sep. 30, 2024
Equity Method Investments and Joint Ventures [Abstract]
Relationship with Bayview Lending Group LLC and Bayview Financial Holdings, L.P.	M&T holds a 20% minority interest in BLG, a privately-held commercial mortgage company. That investment had no remaining carrying value at September 30, 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 nine-month periods ended September 30, 2024 and 2023, respectively. There were no cash distributions during the three-month periods ended September 30, 2024 and 2023. 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 September 30, 2024 and December 31, 2023, respectively. Revenues from those servicing rights were $1 million in each of the three-month periods ended September 30, 2024 and 2023, respectively, and $4 million and $5 million in the nine-month periods ended September 30, 2024 and 2023, respectively. The Company sub-services residential mortgage loans for Bayview Financial having outstanding principal balances of $112.7 billion and $115.3 billion at September 30, 2024 and December 31, 2023, respectively. Revenues earned for sub-servicing loans for Bayview Financial were $29 million and $30 million for the three-month periods ended September 30, 2024 and 2023, respectively, and $92 million and $94 million in the nine-month periods ended September 30, 2024 and 2023, respectively. In addition, the Company held $38 million and $42 million of mortgage-backed securities in its held-to-maturity portfolio at September 30, 2024 and December 31, 2023, respectively, that were securitized by Bayview Financial. At September 30, 2024, the Company held $510 million of Bayview Financial's $3.0 billion syndicated loan facility.

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Pay vs Performance Disclosure
Net income	$ 721	$ 690	$ 1,907	$ 2,259

Insider Trading Arrangements

Insider Trading Arrangements	9 Months Ended
	Sep. 30, 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 polici_2

Significant accounting policies (Policies)	9 Months Ended
	Sep. 30, 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 M&T's 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.

Investment securities (Tables)

Investment securities (Tables)	9 Months Ended
	Sep. 30, 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 September 30, 2024 Investment securities available for sale: U.S. Treasury and federal agencies $ 7,824 $ 62 $ 26 $ 7,860 Mortgage-backed securities: Government issued or guaranteed: Commercial 3,125 55 3 3,177 Residential 5,606 60 77 5,589 Other debt securities 103 — 2 101 16,658 177 108 16,727 Investment securities held to maturity: U.S. Treasury and federal agencies 1,013 — 14 999 Obligations of states and political subdivisions 2,397 — 71 2,326 Mortgage-backed securities: Government issued or guaranteed: Commercial 2,038 — 81 1,957 Residential 9,016 13 646 8,383 Privately issued 38 8 3 43 Other debt securities 1 — — 1 14,503 21 815 13,709 Total debt securities $ 31,161 $ 198 $ 923 $ 30,436 Equity and other securities: Readily marketable equity — at fair value $ 250 $ 9 $ 2 $ 257 Other — at cost 840 — — 840 Total equity and other securities $ 1,090 $ 9 $ 2 $ 1,097 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 September 30, 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 $ 3,206 $ 3,187 Due after one year through five years 4,721 4,774 Due after five years through ten years — — Due after ten years — — 7,927 7,961 Mortgage-backed securities 8,731 8,766 $ 16,658 $ 16,727 Debt securities held to maturity: Due in one year or less $ 589 $ 585 Due after one year through five years 654 643 Due after five years through ten years 1,463 1,429 Due after ten years 705 669 3,411 3,326 Mortgage-backed securities 11,092 10,383 $ 14,503 $ 13,709
Investment Securities in Continuous Unrealized Loss Position	A summary of investment securities that as of September 30, 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 September 30, 2024 Investment securities available for sale: U.S. Treasury and federal agencies $ 125 $ — $ 3,069 $ 26 Mortgage-backed securities: Government issued or guaranteed: Commercial 395 2 128 1 Residential 227 — 1,760 77 Other debt securities — — 64 2 747 2 5,021 106 Investment securities held to maturity: U.S. Treasury and federal agencies — — 949 14 Obligations of states and political subdivisions 26 — 2,192 71 Mortgage-backed securities: Government issued or guaranteed: Commercial — — 1,957 81 Residential — — 7,318 646 Privately issued — — 31 3 26 — 12,447 815 Total $ 773 $ 2 $ 17,468 $ 921 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)	9 Months Ended
	Sep. 30, 2024
Receivables [Abstract]
Summary of Current, Past Due and Nonaccrual Loans	A summary of current, past due and nonaccrual loans as of September 30, 2024 and December 31, 2023 follows: (Dollars in millions) Current 30-89 Days Accruing Loans Past Due 90 Days or More Nonaccrual Total September 30, 2024 Commercial and industrial $ 59,926 $ 265 $ 11 $ 810 $ 61,012 Real estate: Commercial (a) 21,560 231 2 578 22,371 Residential builder and developer 981 9 — 2 992 Other commercial construction 5,123 113 — 84 5,320 Residential (b) 21,042 667 268 219 22,196 Residential — limited documentation 737 29 — 57 823 Consumer: Home equity lines and loans 4,464 30 — 82 4,576 Recreational finance 11,621 90 — 28 11,739 Automobile 4,680 52 — 11 4,743 Other 2,066 20 7 55 2,148 Total $ 132,200 $ 1,506 $ 288 $ 1,926 $ 135,920 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 $716 million at September 30, 2024 and $189 million at December 31, 2023. (b)
Summary of Loan grades applied various classes of Commercial and Real Estate Loans	The following table summarizes the loan grades applied at September 30, 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 and nine-month periods ended September 30, 2024 by origination year. Term Loans by Origination Year Revolving Revolving Loans Converted to Term Total (Dollars in millions) 2024 2023 2022 2021 2020 Prior Commercial and industrial: Pass $ 6,885 $ 7,018 $ 6,491 $ 3,825 $ 1,802 $ 5,440 $ 25,290 $ 78 $ 56,829 Criticized accrual 128 400 419 218 122 641 1,408 37 3,373 Criticized nonaccrual 7 56 82 46 67 274 260 18 810 Total commercial and industrial $ 7,020 $ 7,474 $ 6,992 $ 4,089 $ 1,991 $ 6,355 $ 26,958 $ 133 $ 61,012 Gross charge-offs three months ended September 30, 2024 $ 3 $ 10 $ 25 $ 4 $ 2 $ 8 $ 12 $ — $ 64 Gross charge-offs nine months ended September 30, 2024 $ 4 $ 24 $ 44 $ 19 $ 12 $ 22 $ 95 $ — $ 220 Real estate: Commercial: Pass $ 1,003 $ 1,648 $ 1,296 $ 1,190 $ 1,861 $ 10,308 $ 383 $ — $ 17,689 Criticized accrual 5 308 752 323 648 2,044 24 — 4,104 Criticized nonaccrual — 1 51 32 36 457 1 — 578 Total commercial real estate $ 1,008 $ 1,957 $ 2,099 $ 1,545 $ 2,545 $ 12,809 $ 408 $ — $ 22,371 Gross charge-offs three months ended September 30, 2024 $ — $ — $ — $ — $ — $ 24 $ — $ — $ 24 Gross charge-offs nine months ended September 30, 2024 $ — $ 4 $ — $ — $ 5 $ 67 $ — $ — $ 76 Residential builder and developer: Pass $ 333 $ 323 $ 78 $ 19 $ 4 $ 11 $ 101 $ — $ 869 Criticized accrual 9 43 46 6 — 16 1 — 121 Criticized nonaccrual — — — 1 — 1 — — 2 Total residential builder and developer $ 342 $ 366 $ 124 $ 26 $ 4 $ 28 $ 102 $ — $ 992 Gross charge-offs three months ended September 30, 2024 $ — $ — $ — $ — $ — $ — $ — $ — $ — Gross charge-offs nine months ended September 30, 2024 $ — $ — $ — $ — $ — $ 2 $ — $ — $ 2 Other commercial construction: Pass $ 68 $ 1,290 $ 1,213 $ 283 $ 161 $ 339 $ 46 $ — $ 3,400 Criticized accrual 19 87 673 454 311 284 8 — 1,836 Criticized nonaccrual — — 5 9 49 21 — — 84 Total other commercial construction $ 87 $ 1,377 $ 1,891 $ 746 $ 521 $ 644 $ 54 $ — $ 5,320 Gross charge-offs three months ended September 30, 2024 $ — $ — $ — $ — $ — $ — $ — $ — $ — Gross charge-offs nine months ended September 30, 2024 $ — $ — $ 2 $ — $ — $ 10 $ 2 $ — $ 14 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 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 developer: Pass $ 530 $ 252 $ 41 $ 6 $ 2 $ 12 $ 116 $ — $ 959 Criticized accrual 1 18 30 — 59 — 3 — 111 Criticized nonaccrual — — 3 — — — — — 3 Total residential builder and developer $ 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 construction $ 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 September 30, 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 and nine-month periods ended September 30, 2024 by origination year follows: Term Loans by Origination Year Revolving Revolving Loans Converted to Term Total (Dollars in millions) 2024 2023 2022 2021 2020 Prior Residential: Current $ 1,550 $ 1,415 $ 4,481 $ 3,559 $ 2,427 $ 7,510 $ 100 $ — $ 21,042 30-89 days past due 17 10 114 76 35 415 — — 667 Accruing loans past due 90 days or more — 8 29 29 18 184 — — 268 Nonaccrual — 2 27 15 3 169 3 — 219 Total residential $ 1,567 $ 1,435 $ 4,651 $ 3,679 $ 2,483 $ 8,278 $ 103 $ — $ 22,196 Gross charge-offs three months ended September 30, 2024 $ — $ — $ — $ — $ — $ 1 $ — $ — $ 1 Gross charge-offs nine months ended September 30, 2024 $ — $ — $ — $ — $ — $ 4 $ — $ — $ 4 Residential - limited documentation: Current $ — $ — $ — $ — $ — $ 737 $ — $ — $ 737 30-89 days past due — — — — — 29 — — 29 Accruing loans past due 90 days or more — — — — — — — — — Nonaccrual — — — — — 57 — — 57 Total residential - limited documentation $ — $ — $ — $ — $ — $ 823 $ — $ — $ 823 Gross charge-offs three months ended September 30, 2024 $ — $ — $ — $ — $ — $ — $ — $ — $ — Gross charge-offs nine months ended September 30, 2024 $ — $ — $ — $ — $ — $ — $ — $ — $ — Consumer: Home equity lines and loans: Current $ — $ — $ — $ 2 $ 2 $ 95 $ 3,038 $ 1,327 $ 4,464 30-89 days past due — — — — — 2 — 28 30 Accruing loans past due 90 days or more — — — — — — — — — Nonaccrual — — — — — 3 — 79 82 Total home equity lines and loans $ — $ — $ — $ 2 $ 2 $ 100 $ 3,038 $ 1,434 $ 4,576 Gross charge-offs three months ended September 30, 2024 $ — $ — $ — $ — $ — $ — $ — $ 1 $ 1 Gross charge-offs nine months ended September 30, 2024 $ — $ — $ — $ — $ — $ — $ — $ 3 $ 3 Recreational finance: Current $ 3,153 $ 2,219 $ 2,026 $ 1,609 $ 1,102 $ 1,512 $ — $ — $ 11,621 30-89 days past due 8 17 14 16 14 21 — — 90 Accruing loans past due 90 days or more — — — — — — — — — Nonaccrual 1 5 5 5 4 8 — — 28 Total recreational finance $ 3,162 $ 2,241 $ 2,045 $ 1,630 $ 1,120 $ 1,541 $ — $ — $ 11,739 Gross charge-offs three months ended September 30, 2024 $ 3 $ 5 $ 6 $ 4 $ 4 $ 6 $ — $ — $ 28 Gross charge-offs nine months ended September 30, 2024 $ 4 $ 12 $ 17 $ 14 $ 11 $ 18 $ — $ — $ 76 Automobile: Current $ 1,875 $ 856 $ 826 $ 729 $ 267 $ 127 $ — $ — $ 4,680 30-89 days past due 7 11 13 11 5 5 — — 52 Accruing loans past due 90 days or more — — — — — — — — — Nonaccrual 1 2 2 3 1 2 — — 11 Total automobile $ 1,883 $ 869 $ 841 $ 743 $ 273 $ 134 $ — $ — $ 4,743 Gross charge-offs three months ended September 30, 2024 $ 1 $ 2 $ 2 $ 1 $ 1 $ — $ — $ — $ 7 Gross charge-offs nine months ended September 30, 2024 $ 1 $ 6 $ 6 $ 5 $ 2 $ 2 $ — $ — $ 22 Other: Current $ 205 $ 168 $ 121 $ 81 $ 18 $ 20 $ 1,452 $ 1 $ 2,066 30-89 days past due 3 2 2 1 — — 11 1 20 Accruing loans past due 90 days or more — — — — — — 7 — 7 Nonaccrual 2 1 1 — — — 51 — 55 Total other $ 210 $ 171 $ 124 $ 82 $ 18 $ 20 $ 1,521 $ 2 $ 2,148 Gross charge-offs three months ended September 30, 2024 $ 5 $ 3 $ 2 $ 1 $ — $ — $ 18 $ — $ 29 Gross charge-offs nine months ended September 30, 2024 $ 10 $ 9 $ 7 $ 4 $ 1 $ 2 $ 47 $ — $ 80 Total loans and leases at September 30, 2024 $ 15,279 $ 15,890 $ 18,767 $ 12,542 $ 8,957 $ 30,732 $ 32,184 $ 1,569 $ 135,920 Total gross charge-offs for the three months ended September 30, 2024 $ 12 $ 20 $ 35 $ 10 $ 7 $ 39 $ 30 $ 1 $ 154 Total gross charge-offs for the nine months ended September 30, 2024 $ 19 $ 55 $ 76 $ 42 $ 31 $ 127 $ 144 $ 3 $ 497 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 Total (Dollars in millions) 2023 2022 2021 2020 2019 Prior 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 90 days or more 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 documentation: Current $ — $ — $ — $ — $ — $ 825 $ — $ — $ 825 30-89 days past due — — — — — 31 — — 31 Accruing loans past due 90 days or more — — — — — — — — — Nonaccrual — — — — — 55 — — 55 Total residential - limited documentation $ — $ — $ — $ — $ — $ 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 90 days or more — — — — — — — — — Nonaccrual — — — — — 5 3 73 81 Total home equity lines and loans $ — $ — $ 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 90 days or more — — — — — — — — — 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 90 days or more — — — — — — — — — 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 90 days or more — — — — — — 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 December 31, 2023 $ 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 September 30, 2024 and 2023 were as follows: Commercial and Industrial Real Estate (Dollars in millions) Commercial Residential Consumer Total Three Months Ended September 30, 2024 Beginning balance $ 790 $ 658 $ 110 $ 646 $ 2,204 Provision for credit losses 52 1 (5) 72 120 Net charge-offs: Charge-offs (64) (24) (1) (65) (154) Recoveries 14 4 1 15 34 Net charge-offs (50) (20) — (50) (120) Ending balance $ 792 $ 639 $ 105 $ 668 $ 2,204 Three Months Ended September 30, 2023 Beginning balance $ 583 $ 694 $ 118 $ 603 $ 1,998 Provision for credit losses 40 79 (3) 34 150 Net charge-offs: Charge-offs (26) (52) (1) (43) (122) Recoveries 7 5 — 14 26 Net charge-offs (19) (47) (1) (29) (96) Ending balance $ 604 $ 726 $ 114 $ 608 $ 2,052 Changes in the allowance for credit losses for the nine months ended September 30, 2024 and 2023 were as follows: Commercial and Industrial Real Estate (Dollars in millions) Commercial Residential Consumer Total Nine Months Ended September 30, 2024 Beginning balance $ 620 $ 764 $ 116 $ 629 $ 2,129 Provision for credit losses 365 (60) (11) 176 470 Net charge-offs: Charge-offs (220) (92) (4) (181) (497) Recoveries 27 27 4 44 102 Net charge-offs (193) (65) — (137) (395) Ending balance $ 792 $ 639 $ 105 $ 668 $ 2,204 Nine Months Ended September 30, 2023 Beginning balance $ 568 $ 611 $ 115 $ 631 $ 1,925 Provision for credit losses 73 287 (1) 61 420 Net charge-offs: Charge-offs (70) (180) (4) (125) (379) Recoveries 33 8 4 41 86 Net charge-offs (37) (172) — (84) (293) Ending balance $ 604 $ 726 $ 114 $ 608 $ 2,052
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 and nine-month periods ended September 30, 2024 and 2023 follows: Amortized Cost with Allowance Amortized Cost without Allowance Total Amortized Cost Interest Income Recognized (Dollars in millions) September 30, 2024 June 30, 2024 January 1, 2024 Three Months Nine Months Commercial and industrial $ 610 $ 200 $ 810 $ 805 $ 670 $ 5 $ 14 Real estate: Commercial 348 230 578 707 869 5 31 Residential builder and developer 2 — 2 2 3 1 1 Other commercial construction 21 63 84 77 171 — 3 Residential 113 106 219 205 215 4 10 Residential — limited documentation 22 35 57 55 55 — 1 Consumer: Home equity lines and loans 39 43 82 79 81 2 4 Recreational finance 17 11 28 25 36 — — Automobile 8 3 11 11 14 — — Other 55 — 55 58 52 — — Total $ 1,235 $ 691 $ 1,926 $ 2,024 $ 2,166 $ 17 $ 64 (Dollars in millions) September 30, 2023 June 30, 2023 January 1, 2023 Three Months Nine Months Commercial and industrial $ 366 $ 300 $ 666 $ 607 $ 504 $ 7 $ 13 Real estate: Commercial 417 638 1,055 1,192 1,240 9 18 Residential builder and developer 3 — 3 1 1 — — Other commercial construction 4 132 136 146 125 — 2 Residential 91 150 241 239 272 3 12 Residential — limited documentation 22 40 62 67 78 1 1 Consumer: Home equity lines and loans 48 30 78 77 85 2 6 Recreational finance 21 10 31 32 45 — — Automobile 12 4 16 22 40 — — Other 54 — 54 53 49 — — Total $ 1,038 $ 1,304 $ 2,342 $ 2,436 $ 2,439 $ 22 $ 52
Loan Modification Activities to Borrowers Experiencing Financial Difficulty on Financing Receivables	The tables that follow summarize the Company’s loan modification activities to borrowers experiencing financial difficulty for the three-month and nine-month periods ended September 30, 2024 and 2023: Amortized cost at September 30, 2024 (Dollars in millions) Term Extension Other (a) Combination of Modification Types (b) Total (c) (d) Percent of Total Loan Class Three Months Ended September 30, 2024 Commercial and industrial $ 92 $ 23 $ 2 $ 117 .19 % Real estate: Commercial 163 1 — 164 .73 Residential builder and developer 2 — — 2 .17 Other commercial construction 2 — — 2 .03 Residential 34 4 4 42 .19 Residential — limited documentation 2 1 — 3 .41 Consumer: Home equity lines and loans — — — — — Recreational finance — — — — — Automobile — — — — — Other — — — — — Total $ 295 $ 29 $ 6 $ 330 .24 % Nine Months Ended September 30, 2024 Commercial and industrial $ 190 $ 78 $ 2 $ 270 .44 % Real estate: Commercial 420 1 4 425 1.90 Residential builder and developer 13 — — 13 1.27 Other commercial construction 139 — — 139 2.62 Residential 123 10 6 139 .63 Residential — limited documentation 5 2 — 7 .86 Consumer: Home equity lines and loans 1 — 1 2 .04 Recreational finance 1 — — 1 .01 Automobile — — — — — Other — — — — — Total $ 892 $ 91 $ 13 $ 996 .73 % _______________________________________________________________ (a) Predominantly payment deferrals. (b) Predominantly term extensions combined with interest rate reductions. (c) Includes approximately $33 million and $117 million of loans guaranteed by government-related entities (predominantly first lien residential mortgage loans) for the three-month and nine-month periods ended September 30, 2024, respectively. (d) Excludes unfunded commitments to extend credit totaling $8 million and $43 million for the three-month and nine-month periods ended September 30, 2024, respectively. Amortized cost at September 30, 2023 (Dollars in millions) Term Extension Other (a) Combination of Modification Types (b) Total (c) (d) Percent of Total Loan Class Three Months Ended September 30, 2023 Commercial and industrial $ 40 $ — $ 1 $ 41 .07 % Real estate: Commercial 272 — 6 278 1.07 Residential builder and developer — — — — — Other commercial construction 216 — — 216 3.20 Residential 47 7 1 55 .24 Residential — limited documentation 1 1 — 2 .18 Consumer: Home equity lines and loans — — — — — Recreational finance — — — — — Automobile — — — — — Other — — — — — Total $ 576 $ 8 $ 8 $ 592 .45 % Nine Months Ended September 30, 2023 Commercial and industrial $ 115 $ 10 $ 2 $ 127 .23 % Real estate: Commercial 409 — 14 423 1.63 Residential builder and developer 70 1 — 71 6.42 Other commercial construction 432 — 8 440 6.54 Residential 104 17 4 125 .56 Residential — limited documentation 6 4 1 11 1.11 Consumer: Home equity lines and loans 1 — — 1 .02 Recreational finance — — — — — Automobile — — — — — Other — — — — — Total $ 1,137 $ 32 $ 29 $ 1,198 .91 % _______________________________________________________________ (a) Predominantly payment deferrals. (b) Predominantly term extensions combined with interest rate reductions. (c) Includes approximately $45 million and $92 million of loans guaranteed by government-related entities (predominantly first lien residential mortgage loans) for the three-month and nine-month periods ended September 30, 2023, respectively. (d) Excludes unfunded commitments to extend credit totaling $62 million and $138 million for the three-month and nine-month periods ended September 30, 2023, respectively.
Summary of Payment Status of Loans Modified	The following table summarizes the payment status, at September 30, 2024, of loans that were modified during the twelve-month period ended September 30, 2024. Payment status at September 30, 2024 (amortized cost) (Dollars in millions) Current 30-89 Days Past Due Past Due 90 Days or More (a) Total Twelve Months Ended September 30, 2024 Commercial and industrial $ 308 $ 5 $ 4 $ 317 Real estate: Commercial 422 84 9 515 Residential builder and developer 13 1 — 14 Other commercial construction 141 74 — 215 Residential (b) 93 45 37 175 Residential — limited documentation 6 2 — 8 Consumer: Home equity lines and loans 2 — — 2 Recreational finance 1 — — 1 Automobile — — — — Other — — — — Total $ 986 $ 211 $ 50 $ 1,247 _______________________________________________________________ (a) Predominantly loan modifications with term extensions. (b) Includes loans guaranteed by government-related entities classified as 30 to 89 days past due of $39 million and as past due 90 days or more of $34 million. The following table summarizes the payment status, at September 30, 2023, of loans that were modified during the nine-month period ended September 30, 2023. Payment status at September 30, 2023 (amortized cost) (Dollars in millions) Current 30-89 Days Past Due Past Due 90 Days or More (a) Total Nine Months Ended September 30, 2023 Commercial and industrial $ 109 $ 4 $ 14 $ 127 Real estate: Commercial 406 17 — 423 Residential builder and developer 71 — — 71 Other commercial construction 440 — — 440 Residential (b) 79 34 12 125 Residential — limited documentation 8 1 2 11 Consumer: Home equity lines and loans 1 — — 1 Recreational finance — — — — Automobile — — — — Other — — — — Total $ 1,114 $ 56 $ 28 $ 1,198 ___________________________________________________________ (a) Predominantly loan modifications with term extensions. (b) Includes loans guaranteed by government-related entities classified as 30 to 89 days past due of $28 million and as past due 90 days or more of $11 million.

Borrowings (Tables)

Borrowings (Tables)	9 Months Ended
	Sep. 30, 2024
Debt Disclosure [Abstract]
Schedule of Borrowings	(Dollars in millions) September 30, 2024 December 31, 2023 Short-term borrowings Federal funds purchased and repurchase agreements $ 105 $ 316 FHLB advances 2,500 5,000 Total short-term borrowings $ 2,605 $ 5,316 Long-term borrowings Senior notes — M&T $ 3,371 $ 2,482 Senior notes — M&T Bank 3,744 3,741 FHLB advances 2,004 5 Subordinated notes — M&T 75 76 Subordinated notes — M&T Bank 482 873 Junior subordinated debentures — M&T 543 540 Asset-backed notes 1,354 474 Other 10 10 Total long-term borrowings $ 11,583 $ 8,201

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	9 Months Ended
	Sep. 30, 2024
Equity [Abstract]
Schedule of Preferred Stock	Issued and outstanding preferred stock of M&T as of September 30, 2024 and December 31, 2023 is presented in the following table. September 30, 2024 December 31, 2023 (Dollars in millions) Shares Carrying Value Shares Carrying Value Series E (a) Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock $1,000 liquidation preference per share — $ — 350,000 $ 350 Series F (b) Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock $10,000 liquidation preference per share 50,000 500 50,000 500 Series G (c) Fixed-Rate Reset Non-Cumulative Perpetual Preferred Stock $10,000 liquidation preference per share 40,000 400 40,000 400 Series H (d) Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock $25 liquidation preference per share 10,000,000 261 10,000,000 261 Series I (e) Fixed-Rate Reset Non-Cumulative Perpetual Preferred Stock $10,000 liquidation preference per share 50,000 500 50,000 500 Series J (f) Fixed-Rate Non-Cumulative Perpetual Preferred Stock $10,000 liquidation preference per share 75,000 733 — — _______________________________________________________________ (a) On August 15, 2024, M&T redeemed all outstanding shares of the Series E Preferred Stock. (b) Dividends, if declared, are paid semi-annually at a rate of 5.125% through October 31, 2026 and thereafter will be paid quarterly at a rate of the three-month SOFR plus 378 basis points. The shares are redeemable in whole or in part on or after November 1, 2026. Notwithstanding M&T’s option to redeem the shares, if an event occurs such that the shares no longer qualify as Tier 1 capital, M&T may redeem all of the shares within 90 days following that occurrence. (c) Dividends, if declared, were paid semi-annually at a rate of 5.0% through July 31, 2024. On August 1, 2024, the dividend rate reset at 7.246% and will reset at each subsequent five year anniversary date therefrom at a rate of the five-year U.S. Treasury rate plus 3.174%. The shares became redeemable in whole or in part on August 1, 2024. Notwithstanding M&T’s option to redeem the shares, if an event occurs such that the shares no longer qualify as Tier 1 capital, M&T may redeem all of the shares within 90 days following that occurrence. (d) Dividends, if declared, are paid quarterly at a rate of 5.625% through December 14, 2026 and thereafter will be paid quarterly at a rate of the three-month SOFR rate plus 428 basis points. The shares are redeemable in whole or in part on or after April 1, 2027. Notwithstanding M&T's option to redeem the shares, if an event occurs such that the shares no longer qualify as Tier 1 capital, M&T may redeem all of the shares within 90 days following that occurrence. (e) Dividends, if declared, are paid semi-annually at a rate of 3.5% through August 31, 2026. On September 1, 2026 and at each subsequent five year anniversary date therefrom the dividend rate will reset at a rate of the five-year U.S. Treasury rate plus 2.679%. The shares are redeemable in whole or in part on or after September 1, 2026. Notwithstanding M&T’s option to redeem the shares, if an event occurs such that the shares no longer qualify as Tier 1 capital, M&T may redeem all of the shares within 90 days following that occurrence. (f) Dividends, if declared, are paid quarterly at a rate of 7.5%. The shares are redeemable in whole or in part on or after June 15, 2029. Notwithstanding M&T’s option to redeem the shares, if an event occurs such that the shares no longer qualify as Tier 1 capital, M&T may redeem all of the shares within 90 days following that occurrence.

Revenue from contracts with c_2

Revenue from contracts with customers (Tables)	9 Months Ended
	Sep. 30, 2024
Revenue from Contract with Customer [Abstract]
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 and nine-month periods ended September 30, 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 September 30, 2024 Classification in Consolidated Statement of Income Service charges on deposit accounts $ 40 $ 92 $ — $ 132 Trust income 1 — 169 170 Brokerage services income 2 — 30 32 Other revenues from operations: Merchant discount and credit card interchange fees 18 23 — 41 Other 8 8 3 19 $ 69 $ 123 $ 202 $ 394 Three Months Ended September 30, 2023 Classification in Consolidated Statement of Income Service charges on deposit accounts $ 38 $ 83 $ — $ 121 Trust income — — 155 155 Brokerage services income 1 — 26 27 Other revenues from operations: Merchant discount and credit card interchange fees 21 22 — 43 Other 7 7 — 14 $ 67 $ 112 $ 181 $ 360 (Dollars in millions) Commercial Bank Retail Bank Institutional Services and Wealth Management Total Nine Months Ended September 30, 2024 Classification in Consolidated Statement of Income Service charges on deposit accounts $ 120 $ 263 $ — $ 383 Trust income 3 — 497 500 Brokerage services income 5 — 86 91 Other revenues from operations: Merchant discount and credit card interchange fees 54 67 — 121 Other 23 23 8 54 $ 205 $ 353 $ 591 $ 1,149 Nine Months Ended September 30, 2023 Classification in Consolidated Statement of Income Service charges on deposit accounts $ 109 $ 245 $ — $ 354 Trust income 1 — 520 521 Brokerage services income 4 — 72 76 Other revenues from operations: Merchant discount and credit card interchange fees 57 65 — 122 Other 19 23 4 46 $ 190 $ 333 $ 596 $ 1,119

Pension plans and other postr_2

Pension plans and other postretirement benefits (Tables)	9 Months Ended
	Sep. 30, 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 Benefits Other Postretirement Benefits Three Months Ended September 30, (Dollars in millions) 2024 2023 2024 2023 Service cost $ 3 $ 3 $ — $ — Interest cost on projected benefit obligation 28 29 1 1 Expected return on plan assets (50) (50) — — Amortization of prior service credit — — (1) — Amortization of net actuarial gain — (1) (1) (1) Net periodic benefit $ (19) $ (19) $ (1) $ — Pension Benefits Other Postretirement Benefits Nine Months Ended September 30, (Dollars in millions) 2024 2023 2024 2023 Service cost $ 8 $ 9 $ 1 $ 1 Interest cost on projected benefit obligation 86 87 2 2 Expected return on plan assets (151) (151) — — Amortization of prior service credit — — (2) (1) Amortization of net actuarial gain (1) (2) (2) (2) Net periodic benefit $ (58) $ (57) $ (1) $ —

Earnings per common share (Tabl

Earnings per common share (Tables)	9 Months Ended
	Sep. 30, 2024
Earnings Per Share [Abstract]
Computations of Basic Earnings Per Common Share	The computations of basic earnings per common share follow: Three Months Ended September 30, Nine Months Ended September 30, (Dollars in millions, except per share, shares in thousands) 2024 2023 2024 2023 Income available to common shareholders: Net income $ 721 $ 690 $ 1,907 $ 2,259 Less: Preferred stock dividends (47) (25) (99) (75) Net income available to common equity 674 665 1,808 2,184 Less: Income attributable to unvested stock-based compensation awards — (1) (3) (4) Net income available to common shareholders $ 674 $ 664 $ 1,805 $ 2,180 Weighted-average shares outstanding: Common shares outstanding (including common stock issuable) and unvested stock-based compensation awards 167,011 166,217 167,010 166,787 Less: Unvested stock-based compensation awards (340) (308) (316) (299) Weighted-average shares outstanding 166,671 165,909 166,694 166,488 Basic earnings per common share $ 4.04 $ 4.00 $ 10.83 $ 13.09
Computations of Diluted Earnings Per Common Share	The computations of diluted earnings per common share follow: Three Months Ended September 30, Nine Months Ended September 30, (Dollars in millions, except per share, shares in thousands) 2024 2023 2024 2023 Net income available to common equity $ 674 $ 665 $ 1,808 $ 2,184 Less: Income attributable to unvested stock-based compensation awards — (1) (3) (4) Net income available to common shareholders $ 674 $ 664 $ 1,805 $ 2,180 Adjusted weighted-average shares outstanding: Common shares outstanding (including common stock issuable) and unvested stock-based compensation awards 167,011 166,217 167,010 166,787 Less: Unvested stock-based compensation awards (340) (308) (316) (299) Plus: Incremental shares from assumed conversion of stock-based compensation awards 896 661 743 605 Adjusted weighted-average shares outstanding 167,567 166,570 167,437 167,093 Diluted earnings per common share $ 4.02 $ 3.98 $ 10.78 $ 13.05

Comprehensive income (Tables)

Comprehensive income (Tables)	9 Months Ended
	Sep. 30, 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: (Dollars in millions) Investment Cash Flow Hedges Defined Benefit Plans Other Total Income Net Balance — January 1, 2024 $ (251) $ (203) $ (155) $ (7) $ (616) $ 157 $ (459) Other comprehensive income (loss) before reclassifications: Unrealized holding gains, net 307 — — — 307 (78) 229 Unrealized losses on cash flow hedges — (26) — — (26) 7 (19) Other — — — 3 3 (1) 2 Total other comprehensive income (loss) before reclassifications 307 (26) — 3 284 (72) 212 Amounts reclassified from accumulated other comprehensive income (loss) that (increase) decrease net income: Net losses realized in net income 13 — — — 13 (4) 9 Net yield adjustment from cash flow hedges currently in effect — 288 — — 288 (a) (73) 215 Amortization of prior service credit — — (2) — (2) (b) — (2) Amortization of actuarial gains — — (3) — (3) (b) 1 (2) Total other comprehensive income (loss) 320 262 (5) 3 580 (148) 432 Balance — September 30, 2024 $ 69 $ 59 $ (160) $ (4) $ (36) $ 9 $ (27) Balance — January 1, 2023 $ (444) $ (336) $ (273) $ (13) $ (1,066) $ 276 $ (790) Other comprehensive income (loss) before reclassifications: Unrealized holding losses, net (2) — — — (2) 1 (1) Unrealized losses on cash flow hedges — (366) — — (366) 91 (275) Total other comprehensive income (loss) before reclassifications (2) (366) — — (368) 92 (276) Amounts reclassified from accumulated other comprehensive income (loss) that (increase) decrease net income: Net yield adjustment from cash flow hedges currently in effect — 173 — — 173 (a) (44) 129 Amortization of prior service credit — — (1) — (1) (b) — (1) Amortization of actuarial gains — — (4) — (4) (b) — (4) Total other comprehensive income (loss) (2) (193) (5) — (200) 48 (152) Balance — September 30, 2023 $ (446) $ (529) $ (278) $ (13) $ (1,266) $ 324 $ (942) _______________________________________________________________ (a) Included in "interest income" in the Consolidated Statement of Income. (b)
Accumulated Other Comprehensive Income (Loss), Net	Accumulated other comprehensive income (loss), net consisted of the following: (Dollars in millions) Investment Securities Cash Flow Hedges Defined Benefit Plans Other Total Balance — December 31, 2023 $ (187) $ (151) $ (115) $ (6) $ (459) Net gain (loss) during period 238 196 (4) 2 432 Balance — September 30, 2024 $ 51 $ 45 $ (119) $ (4) $ (27)

Derivative financial instrume_2

Derivative financial instruments (Tables)	9 Months Ended
	Sep. 30, 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: Notional Weighted-Average Weighted- Average Rate Estimated Fair Value Gain (Loss) (a) (Dollars in millions) Fixed Variable September 30, 2024 Fair value hedges: Fixed rate long-term borrowings (b) (d) $ 3,850 5.4 3.48 % 5.06 % $ (8) Fixed rate investment securities available for sale (c) 15 0.3 4.84 4.86 — Cash flow hedges: Interest payments on variable rate commercial real estate and commercial 26,705 1.5 3.39 5.02 (30) Total $ 30,570 2.0 $ (38) December 31, 2023 Fair value hedges: Fixed rate long-term borrowings (b) (f) $ 3,000 5.8 3.45 % 5.62 % $ (1) Cash flow hedges: Interest payments on variable rate commercial real estate loans (b) (g) 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 gains of $15 million at September 30, 2024 and of losses of $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 gains of $89 million at September 30, 2024 and of losses of $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) Under the terms of these agreements, the Company receives settlement amounts at a variable rate and pays at a fixed rate. (d) Includes notional amount and terms of $1.9 billion of forward-starting interest rate swap agreements that become effective in 2025. (e) Includes notional amount and terms of $6.6 billion of forward-starting interest rate swap agreements that become effective in 2024, 2025 and 2026. (f) Includes notional amount and terms of $1.0 billion of forward-starting interest rate swap agreements that become effective in 2025. (g) 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 (Dollars in millions) September 30, December 31, September 30, December 31, Derivatives designated and qualifying as hedging instruments (a) Interest rate swap agreements $ — $ 12 $ 38 $ 2 Commitments to sell real estate loans 1 6 17 8 1 18 55 10 Derivatives not designated and qualifying as hedging instruments (a) Mortgage banking: Mortgage-related commitments to originate real estate loans for sale 29 15 21 32 Commitments to sell real estate loans 24 35 19 3 53 50 40 35 Other: Interest rate contracts (b) 218 237 571 879 Foreign exchange and other option and futures contracts 14 19 13 19 232 256 584 898 Total derivatives $ 286 $ 324 $ 679 $ 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 September 30, 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 $496 million and $783 million, respectively, as of each period end, and in a liability position of $51 million and $32 million, respectively. Carrying Amount of the Hedged Item Cumulative Amount of Fair Value Hedging Adjustment Increasing (Decreasing) the Carrying (Dollars in millions) September 30, December 31, 2023 September 30, December 31, 2023 Location in the Consolidated Balance Sheet of the Hedged Items in Fair Value Hedges Long-term borrowings $ 3,853 $ 2,954 $ 8 $ (44) Investment securities available for sale 391 —
Information about Fair Values of Derivative Instruments in Consolidated Statement of Income	Amount of Gain (Loss) Recognized Three Months Ended September 30, 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) $ 130 $ (130) $ (61) $ 61 Fixed rate investment securities available for sale (b) — — Total $ 130 $ (130) $ (61) $ 61 Derivatives not designated as hedging instruments Interest rate contracts (c) $ 5 $ 6 Foreign exchange and other option and futures contracts (c) 5 4 Total $ 10 $ 10 Amount of Gain (Loss) Recognized Nine Months Ended September 30, 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) $ 52 $ (52) $ (95) $ 96 Fixed rate investment securities available for sale (b) — — Total $ 52 $ (52) $ (95) $ 96 Derivatives not designated as hedging instruments Interest rate contracts (c) $ 11 $ 25 Foreign exchange and other option and futures contracts (c) 13 11 Total $ 24 $ 36 _______________________________________________________________ (a) Reported as an adjustment to "interest expense" in the Consolidated Statement of Income. (b) Reported as an adjustment to "interest income" in the Consolidated Statement of Income. (c) 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)	9 Months Ended
	Sep. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Variable Interest Entities	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) September 30, 2024 December 31, 2023 Affordable housing projects: Carrying amount (a) $ 1,365 $ 1,340 Amount of future funding commitments included in carrying amount (b) 431 410 Contingent commitments 65 55 Renewable energy: Carrying amount (a) 71 80 Amount of future funding commitments included in carrying amount (b) — 31 Other: Carrying amount (a) 38 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)	9 Months Ended
	Sep. 30, 2024
Fair Value Disclosures [Abstract]
Assets and Liabilities Measured at Estimated Fair Value on Recurring Basis	The following tables present assets and liabilities at September 30, 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) September 30, 2024 Trading account $ 102 $ 102 $ — $ — Investment securities available for sale: U.S. Treasury and federal agencies 7,860 — 7,860 — Mortgage-backed securities: Government issued or guaranteed: Commercial 3,177 — 3,177 — Residential 5,589 — 5,589 — Other debt securities 101 — 101 — 16,727 — 16,727 — Equity securities 257 244 13 — Real estate loans held for sale 958 — 958 — Other assets (b) 286 — 257 29 Total assets $ 18,330 $ 346 $ 17,955 $ 29 Other liabilities (b) $ 679 $ — $ 658 $ 21 Total liabilities $ 679 $ — $ 658 $ 21 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 6% at September 30, 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 Financial Instrument Assets (Liabilities)	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 table: (Dollars in millions) Carrying Amount Estimated Fair Value Level 1 Level 2 Level 3 September 30, 2024 Financial assets: Cash and cash equivalents $ 2,216 $ 2,216 $ 2,107 $ 109 $ — Interest-bearing deposits at banks 24,417 24,417 — 24,417 — Investment securities held to maturity 14,503 13,709 — 13,666 43 Loans and leases, net 133,716 132,086 — 7,581 124,505 Financial liabilities: Time deposits 16,512 16,514 — 16,514 — Short-term borrowings 2,605 2,605 — 2,605 — Long-term borrowings 11,583 11,705 — 11,705 — 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)	9 Months Ended
	Sep. 30, 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. (Dollars in millions) September 30, December 31, Commitments to extend credit: Commercial and industrial $ 30,210 $ 28,566 Commercial real estate loans to be sold 825 916 Other commercial real estate 3,153 5,019 Residential real estate loans to be sold 258 163 Other residential real estate 744 331 Home equity lines of credit 7,950 8,109 Credit cards 5,889 5,578 Other 271 413 Standby letters of credit 2,267 2,289 Commercial letters of credit 70 62 Financial guarantees and indemnification contracts 4,090 4,036 Commitments to sell real estate loans 1,940 1,400

Segment information (Tables)

Segment information (Tables)	9 Months Ended
	Sep. 30, 2024
Segment Reporting [Abstract]
Information about Company's Segments	Information about the Company's segments follows: Three Months Ended September 30, 2024 2023 (Dollars in millions) Total Inter- segment Revenues Net Income (Loss) Total Average Assets Total Inter- segment Revenues Net Income (Loss) Total Average Assets Commercial Bank $ 723 $ — $ 239 $ 80,434 $ 738 $ 1 $ 251 $ 80,473 Retail Bank 1,292 — 446 53,128 1,307 — 473 51,024 Institutional Services and Wealth 389 4 137 3,898 363 3 120 3,664 All Other (72) (4) (101) 72,121 (73) (4) (154) 70,630 Total $ 2,332 $ — $ 721 $ 209,581 $ 2,335 $ — $ 690 $ 205,791 Nine Months Ended September 30, 2024 2023 (Dollars in millions) Total Revenues(a) Inter- segment Revenues Net Income (Loss) Total Average Assets Total Revenues(a) Inter- segment Revenues Net Income (Loss) Total Average Assets Commercial Bank $ 2,139 $ 4 $ 645 $ 80,903 $ 2,308 $ 4 $ 819 $ 80,169 Retail Bank 3,854 — 1,364 52,771 3,837 — 1,400 51,124 Institutional Services and Wealth 1,167 10 409 3,735 1,344 9 515 3,680 All Other (266) (14) (511) 73,599 (146) (13) (475) 69,293 Total $ 6,894 $ — $ 1,907 $ 211,008 $ 7,343 $ — $ 2,259 $ 204,266 _______________________________________________________________ (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 $13 million and $15 million for the three-month periods ended September 30, 2024 and 2023, respectively, and $38 million and $41 million for the nine-month periods ended September 30, 2024 and 2023, respectively, and is eliminated in "All Other" total revenues.

Divestiture - Additional Inform

Divestiture - Additional Information (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Apr. 29, 2023	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Business Acquisition [Line Items]
Gain on disposition of business	$ 225,000
Revenue from contract with customer		$ 394,000	$ 360,000	$ 1,149,000	$ 1,119,000
Trust income
Business Acquisition [Line Items]
Revenue from contract with customer		$ 170,000	$ 155,000	$ 500,000	521,000
Collective Investment Trust
Business Acquisition [Line Items]
Gain on disposition of business, net of tax	$ 157,000
Collective Investment Trust | Trust income
Business Acquisition [Line Items]
Revenue from contract with customer					$ 60,000

Investment Securities - Amortiz

Investment Securities - Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-Sale [Line Items]
Investment securities available for sale, amortized cost	$ 16,658,000	$ 10,691,000
Investment securities available for sale, gross unrealized gains	177,000	0
Investment securities available for sale, gross unrealized losses	108,000	251,000
Available for sale (cost: $16,658 at September 30, 2024; $10,691 at December 31, 2023)	16,727,000	10,440,000
Total debt securities Amortized cost	31,161,000	26,021,000
Total debt securities Gross unrealized gains	198,000	13,000
Total debt securities Gross unrealized losses	923,000	1,286,000
Total debt securities Estimated fair value	30,436,000	24,748,000
Readily marketable securities Amortized cost	250,000	266,000
Readily marketable securities Gross unrealized gains	9,000	5,000
Readily marketable securities Gross unrealized losses	2,000	3,000
Readily marketable securities Estimated fair value	257,000	268,000
Other securities, Amortized cost	840,000	859,000
Other securities, Estimated fair value	840,000	859,000
Equity and other securities, cost	1,090,000	1,125,000
Equity securities, Gross Unrealized Gains	9,000	5,000
Equity securities, Gross Unrealized Losses	2,000	3,000
Equity and other securities (cost: $1,090 at September 30, 2024; $1,125 at December 31, 2023)	1,097,000	1,127,000
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract]
Amortized cost for held to maturity	14,503,000	15,330,000
Gross unrealized gains for held to maturity	21,000	13,000
Gross unrealized losses for held to maturity	815,000	1,035,000
Investment securities, held to maturity, fair value	13,709,000	14,308,000
U.S. Treasury and federal agencies
Debt Securities, Available-for-Sale [Line Items]
Investment securities available for sale, amortized cost	7,824,000	7,818,000
Investment securities available for sale, gross unrealized gains	62,000	0
Investment securities available for sale, gross unrealized losses	26,000	113,000
Available for sale (cost: $16,658 at September 30, 2024; $10,691 at December 31, 2023)	7,860,000	7,705,000
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract]
Amortized cost for held to maturity	1,013,000	1,005,000
Gross unrealized gains for held to maturity	0	0
Gross unrealized losses for held to maturity	14,000	31,000
Investment securities, held to maturity, fair value	999,000	974,000
Commercial
Debt Securities, Available-for-Sale [Line Items]
Investment securities available for sale, amortized cost	3,125,000	425,000
Investment securities available for sale, gross unrealized gains	55,000	0
Investment securities available for sale, gross unrealized losses	3,000	9,000
Available for sale (cost: $16,658 at September 30, 2024; $10,691 at December 31, 2023)	3,177,000	416,000
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract]
Amortized cost for held to maturity	2,038,000	2,033,000
Gross unrealized gains for held to maturity	0	0
Gross unrealized losses for held to maturity	81,000	130,000
Investment securities, held to maturity, fair value	1,957,000	1,903,000
Residential
Debt Securities, Available-for-Sale [Line Items]
Investment securities available for sale, amortized cost	5,606,000	2,272,000
Investment securities available for sale, gross unrealized gains	60,000	0
Investment securities available for sale, gross unrealized losses	77,000	118,000
Available for sale (cost: $16,658 at September 30, 2024; $10,691 at December 31, 2023)	5,589,000	2,154,000
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract]
Amortized cost for held to maturity	9,016,000	9,747,000
Gross unrealized gains for held to maturity	13,000	4,000
Gross unrealized losses for held to maturity	646,000	802,000
Investment securities, held to maturity, fair value	8,383,000	8,949,000
Other debt securities
Debt Securities, Available-for-Sale [Line Items]
Investment securities available for sale, amortized cost	103,000	176,000
Investment securities available for sale, gross unrealized gains	0	0
Investment securities available for sale, gross unrealized losses	2,000	11,000
Available for sale (cost: $16,658 at September 30, 2024; $10,691 at December 31, 2023)	101,000	165,000
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract]
Amortized cost for held to maturity	1,000	2,000
Gross unrealized gains for held to maturity	0	0
Gross unrealized losses for held to maturity	0	0
Investment securities, held to maturity, fair value	1,000	2,000
Obligations of states and political subdivisions
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract]
Amortized cost for held to maturity	2,397,000	2,501,000
Gross unrealized gains for held to maturity	0	0
Gross unrealized losses for held to maturity	71,000	67,000
Investment securities, held to maturity, fair value	2,326,000	2,434,000
Privately issued
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract]
Amortized cost for held to maturity	38,000	42,000
Gross unrealized gains for held to maturity	8,000	9,000
Gross unrealized losses for held to maturity	3,000	5,000
Investment securities, held to maturity, fair value	$ 43,000	$ 46,000

Investment Securities - Additio

Investment Securities - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($) security	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) security	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)
Summary of Investment Holdings [Line Items]
Gross realized gains(loss) on sale of investment securities			$ 13,000,000	$ 0
Gains (losses) on equity securities	$ (2,000,000)	$ 0	$ (8,000,000)	$ 0
Number of debt securities with aggregate gross unrealized losses | security	3,600		3,600
Unrealized losses on individual debt securities			$ 923,000,000
Cost method equity securities	$ 840,000,000		840,000,000
Allowance for credit losses	0		0		$ 0
Investment securities pledged to secure debt carrying value	7,400,000,000		7,400,000,000		8,200,000,000
Carrying value of investment securities pledged related to repurchase transactions	$ 124,000,000		$ 124,000,000		$ 393,000,000

Investment Securities - Amort_2

Investment Securities - Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Debt securities available for sale:
Due in one year or less	$ 3,206,000
Due after one year through five years	4,721,000
Due after five years through ten years	0
Due after ten years	0
Total available for sale (amortized cost)	7,927,000
Mortgage-backed securities	8,731,000
Investment securities available for sale, amortized cost	16,658,000	$ 10,691,000
Debt securities held to maturity:
Due in one year or less	589,000
Due after one year through five years	654,000
Due after five years through ten years	1,463,000
Due after ten years	705,000
Total available for held to maturity (amortized cost)	3,411,000
Mortgage-backed securities	11,092,000
Amortized cost for held to maturity	14,503,000	15,330,000
Debt securities available for sale:
Due in one year or less	3,187,000
Due after one year through five years	4,774,000
Due after five years through ten years	0
Due after ten years	0
Total available for sale (fair value)	7,961,000
Mortgage-backed securities	8,766,000
Investment securities available for sale, estimated fair value	16,727,000	10,440,000
Debt securities held to maturity:
Due in one year or less	585,000
Due after one year through five years	643,000
Due after five years through ten years	1,429,000
Due after ten years	669,000
Total available for held to maturity (fair value)	3,326,000
Mortgage-backed securities	10,383,000
Estimated fair value for held to maturity	$ 13,709,000	$ 14,308,000

Investment Securities - Investm

Investment Securities - Investment Securities in Continuous Unrealized Loss Position (Detail) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]
AFS, less than 12 months, fair value	$ 747	$ 460
AFS, less than 12 months, gross unrealized losses	2	4
AFS, 12 months or longer, fair value	5,021	9,917
AFS, 12 months or longer, gross unrealized losses	106	247
Total investment securities, less than 12 months, fair value	773	2,011
Total investment securities, less than 12 months, gross unrealized losses	2	27
Total investment securities, 12 months or longer, fair value	17,468	21,761
Total investment securities, 12 months or longer, gross unrealized losses	921	1,259
Schedule of Held-to-Maturity Securities [Line Items]
HTM, less than 12 months, fair value	26	1,551
HTM, Less than 12 months, gross unrealized losses	0	23
HTM, 12 months or longer, fair value	12,447	11,844
HTM, 12 months or longer, gross unrealized losses	815	1,012
U.S. Treasury and federal agencies
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]
AFS, less than 12 months, fair value	125	229
AFS, less than 12 months, gross unrealized losses	0	1
AFS, 12 months or longer, fair value	3,069	7,474
AFS, 12 months or longer, gross unrealized losses	26	112
Schedule of Held-to-Maturity Securities [Line Items]
HTM, less than 12 months, fair value	0	50
HTM, Less than 12 months, gross unrealized losses	0	0
HTM, 12 months or longer, fair value	949	924
HTM, 12 months or longer, gross unrealized losses	14	31
Commercial
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]
AFS, less than 12 months, fair value	395	74
AFS, less than 12 months, gross unrealized losses	2	1
AFS, 12 months or longer, fair value	128	330
AFS, 12 months or longer, gross unrealized losses	1	8
Schedule of Held-to-Maturity Securities [Line Items]
HTM, less than 12 months, fair value	0	328
HTM, Less than 12 months, gross unrealized losses	0	9
HTM, 12 months or longer, fair value	1,957	1,575
HTM, 12 months or longer, gross unrealized losses	81	121
Residential
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]
AFS, less than 12 months, fair value	227	151
AFS, less than 12 months, gross unrealized losses	0	2
AFS, 12 months or longer, fair value	1,760	1,959
AFS, 12 months or longer, gross unrealized losses	77	116
Schedule of Held-to-Maturity Securities [Line Items]
HTM, less than 12 months, fair value	0	955
HTM, Less than 12 months, gross unrealized losses	0	11
HTM, 12 months or longer, fair value	7,318	7,139
HTM, 12 months or longer, gross unrealized losses	646	791
Other debt securities
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]
AFS, less than 12 months, fair value	0	6
AFS, less than 12 months, gross unrealized losses	0	0
AFS, 12 months or longer, fair value	64	154
AFS, 12 months or longer, gross unrealized losses	2	11
Obligations of states and political subdivisions
Schedule of Held-to-Maturity Securities [Line Items]
HTM, less than 12 months, fair value	26	218
HTM, Less than 12 months, gross unrealized losses	0	3
HTM, 12 months or longer, fair value	2,192	2,172
HTM, 12 months or longer, gross unrealized losses	71	64
Privately issued
Schedule of Held-to-Maturity Securities [Line Items]
HTM, less than 12 months, fair value	0	0
HTM, Less than 12 months, gross unrealized losses	0	0
HTM, 12 months or longer, fair value	31	34
HTM, 12 months or longer, gross unrealized losses	$ 3	$ 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 Thousands	Sep. 30, 2024	Dec. 31, 2023
Financing Receivable, Past Due [Line Items]
Nonaccrual loans	$ 1,926,000	$ 2,166,000
Total	135,920,000	134,068,000
Current
Financing Receivable, Past Due [Line Items]
Loans	132,200,000	129,839,000
30-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	1,506,000	1,724,000
Accruing Loans Past Due 90 Days or More
Financing Receivable, Past Due [Line Items]
Loans	288,000	339,000
Commercial and industrial
Financing Receivable, Past Due [Line Items]
Nonaccrual loans	810,000	670,000
Total	61,012,000	57,010,000
Commercial and industrial | Current
Financing Receivable, Past Due [Line Items]
Loans	59,926,000	56,091,000
Commercial and industrial | 30-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	265,000	238,000
Commercial and industrial | Accruing Loans Past Due 90 Days or More
Financing Receivable, Past Due [Line Items]
Loans	11,000	11,000
Commercial Real Estate | Commercial
Financing Receivable, Past Due [Line Items]
Nonaccrual loans	578,000	869,000
Total	22,371,000	25,277,000
Commercial Real Estate | Commercial | Current
Financing Receivable, Past Due [Line Items]
Loans	21,560,000	24,072,000
Commercial Real Estate | Commercial | 30-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	231,000	311,000
Commercial Real Estate | Commercial | Accruing Loans Past Due 90 Days or More
Financing Receivable, Past Due [Line Items]
Loans	2,000	25,000
Commercial Real Estate | Residential builder and developer
Financing Receivable, Past Due [Line Items]
Nonaccrual loans	2,000	3,000
Total	992,000	1,073,000
Commercial Real Estate | Residential builder and developer | Current
Financing Receivable, Past Due [Line Items]
Loans	981,000	1,065,000
Commercial Real Estate | Residential builder and developer | 30-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	9,000	5,000
Commercial Real Estate | Residential builder and developer | Accruing Loans Past Due 90 Days or More
Financing Receivable, Past Due [Line Items]
Loans	0	0
Commercial Real Estate | Other commercial construction
Financing Receivable, Past Due [Line Items]
Nonaccrual loans	84,000	171,000
Total	5,320,000	6,653,000
Commercial Real Estate | Other commercial construction | Current
Financing Receivable, Past Due [Line Items]
Loans	5,123,000	6,322,000
Commercial Real Estate | Other commercial construction | 30-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	113,000	159,000
Commercial Real Estate | Other commercial construction | Accruing Loans Past Due 90 Days or More
Financing Receivable, Past Due [Line Items]
Loans	0	1,000
Residential Real Estate | Residential
Financing Receivable, Past Due [Line Items]
Nonaccrual loans	219,000	215,000
Total	22,196,000	22,353,000
Residential Real Estate | Residential | Current
Financing Receivable, Past Due [Line Items]
Loans	21,042,000	21,080,000
Total	21,042,000	21,080,000
Residential Real Estate | Residential | 30-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	667,000	763,000
Residential Real Estate | Residential | Accruing Loans Past Due 90 Days or More
Financing Receivable, Past Due [Line Items]
Loans	268,000	295,000
Total	268,000	295,000
Residential Real Estate | Residential — limited documentation
Financing Receivable, Past Due [Line Items]
Nonaccrual loans	57,000	55,000
Total	823,000	911,000
Residential Real Estate | Residential — limited documentation | Current
Financing Receivable, Past Due [Line Items]
Loans	737,000	825,000
Total	737,000	825,000
Residential Real Estate | Residential — limited documentation | 30-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	29,000	31,000
Residential Real Estate | Residential — limited documentation | Accruing Loans Past Due 90 Days or More
Financing Receivable, Past Due [Line Items]
Loans	0	0
Total	0	0
Consumer: | Home equity lines and loans
Financing Receivable, Past Due [Line Items]
Nonaccrual loans	82,000	81,000
Total	4,576,000	4,649,000
Consumer: | Home equity lines and loans | Current
Financing Receivable, Past Due [Line Items]
Loans	4,464,000	4,528,000
Total	4,464,000	4,528,000
Consumer: | Home equity lines and loans | 30-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	30,000	40,000
Consumer: | Home equity lines and loans | Accruing Loans Past Due 90 Days or More
Financing Receivable, Past Due [Line Items]
Loans	0	0
Total	0	0
Consumer: | Recreational finance
Financing Receivable, Past Due [Line Items]
Nonaccrual loans	28,000	36,000
Total	11,739,000	10,058,000
Consumer: | Recreational finance | Current
Financing Receivable, Past Due [Line Items]
Loans	11,621,000	9,935,000
Total	11,621,000	9,935,000
Consumer: | Recreational finance | 30-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	90,000	87,000
Consumer: | Recreational finance | Accruing Loans Past Due 90 Days or More
Financing Receivable, Past Due [Line Items]
Loans	0	0
Total	0	0
Consumer: | Automobile
Financing Receivable, Past Due [Line Items]
Nonaccrual loans	11,000	14,000
Total	4,743,000	3,992,000
Consumer: | Automobile | Current
Financing Receivable, Past Due [Line Items]
Loans	4,680,000	3,918,000
Total	4,680,000	3,918,000
Consumer: | Automobile | 30-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	52,000	60,000
Consumer: | Automobile | Accruing Loans Past Due 90 Days or More
Financing Receivable, Past Due [Line Items]
Loans	0	0
Total	0	0
Consumer: | Other
Financing Receivable, Past Due [Line Items]
Nonaccrual loans	55,000	52,000
Total	2,148,000	2,092,000
Consumer: | Other | Current
Financing Receivable, Past Due [Line Items]
Loans	2,066,000	2,003,000
Consumer: | Other | 30-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans	20,000	30,000
Consumer: | Other | Accruing Loans Past Due 90 Days or More
Financing Receivable, Past Due [Line Items]
Loans	$ 7,000	$ 7,000

Loans and Leases and the Allo_4

Loans and Leases and the Allowance for Credit Losses - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Loans And Leases Receivable [Line Items]
Modified in period	$ 330,000	$ 592,000	$ 996,000	$ 1,198,000
Amount of foreclosed residential real estate property held	37,000		37,000		$ 39,000
Loans secured by residential real estate that were in the process of foreclosure	$ 166,000		$ 166,000		170,000
Percentage loans in the process of foreclosure, serviced by other entities, classified as government guaranteed	35%		35%
Guaranteed by Government-Related Entities
Loans And Leases Receivable [Line Items]
Modified in period	$ 33,000	45,000	$ 117,000	92,000
Modified past due 30-89 days	39,000	28,000	39,000	28,000
Modified past due 90 days or more	$ 34,000	$ 11,000	$ 34,000	$ 11,000
Commercial Real Estate
Loans And Leases Receivable [Line Items]
Weighted-average remaining term	7 months 6 days	1 year 3 months 18 days	9 months 18 days	1 year 2 months 12 days
Commercial Real Estate | Asset Pledged as Collateral without Right
Loans And Leases Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 15,500,000		$ 15,500,000
Commercial Real Estate | Asset Pledged as Collateral without Right | FHLBs Facility
Loans And Leases Receivable [Line Items]
Pledged financial instruments					16,400,000
Residential Real Estate
Loans And Leases Receivable [Line Items]
Weighted-average remaining term	9 years 1 month 6 days	11 years 6 months	9 years 10 months 24 days	10 years 1 month 6 days
Residential Real Estate | Asset Pledged as Collateral without Right
Loans And Leases Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 18,500,000		$ 18,500,000
Residential Real Estate | Asset Pledged as Collateral without Right | FHLBs Facility
Loans And Leases Receivable [Line Items]
Pledged financial instruments					18,800,000
Commercial and industrial
Loans And Leases Receivable [Line Items]
Modified in period	$ 117,000	$ 41,000	$ 270,000	$ 127,000
Weighted-average remaining term	1 year 3 months 18 days	1 year 3 months 18 days	1 year	1 year 2 months 12 days
Commercial and industrial | Asset Pledged as Collateral without Right
Loans And Leases Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 19,900,000		$ 19,900,000
Commercial and industrial | Asset Pledged as Collateral without Right | FHLBs Facility
Loans And Leases Receivable [Line Items]
Pledged financial instruments					13,400,000
Commercial | Commercial Real Estate
Loans And Leases Receivable [Line Items]
Mortgage loans held for sale	716,000		716,000		189,000
Modified in period	164,000	$ 278,000	425,000	$ 423,000
Residential | Residential Real Estate
Loans And Leases Receivable [Line Items]
Mortgage loans held for sale	242,000		242,000		190,000
Modified in period	42,000	55,000	139,000	125,000
Commercial Loans and Commercial Real Estate | Minimum
Loans And Leases Receivable [Line Items]
Amount of real estate loan as reported as accruing or nonaccruing	5,000		5,000
Unfunded Loan Commitment
Loans And Leases Receivable [Line Items]
Modified in period	8,000	62,000	43,000	138,000
Home equity lines and loans | Consumer:
Loans And Leases Receivable [Line Items]
Modified in period	0	0	2,000	1,000
Home equity lines and loans | Consumer: | Asset Pledged as Collateral without Right
Loans And Leases Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	2,700,000		2,700,000
Home equity lines and loans | Consumer: | Asset Pledged as Collateral without Right | FHLBs Facility
Loans And Leases Receivable [Line Items]
Pledged financial instruments					2,600,000
Other | Consumer:
Loans And Leases Receivable [Line Items]
Modified in period	0	$ 0	0	$ 0
Other | Consumer: | Asset Pledged as Collateral without Right
Loans And Leases Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 12,700,000		$ 12,700,000
Other | Consumer: | Asset Pledged as Collateral without Right | FHLBs Facility
Loans And Leases Receivable [Line Items]
Pledged financial instruments					$ 11,000,000

Loans and Leases and the Allo_5

Loans and Leases and the Allowance for Credit Losses - Summary of Loan grades applied various classes of Commercial and Real Estate Loans (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	$ 15,279,000		$ 15,279,000		$ 18,423,000
Year two	15,890,000		15,890,000		21,683,000
Year three	18,767,000		18,767,000		15,025,000
Year four	12,542,000		12,542,000		10,555,000
Year five	8,957,000		8,957,000		10,062,000
Prior	30,732,000		30,732,000		27,464,000
Total	135,920,000		135,920,000		134,068,000
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Year one	12,000		19,000
Year two	20,000		55,000
Year three	35,000		76,000
Year four	10,000		42,000
Year five	7,000		31,000
Prior	39,000		127,000
Total	154,000	$ 122,000	497,000	$ 379,000
Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	7,020,000		7,020,000		9,010,000
Year two	7,474,000		7,474,000		8,434,000
Year three	6,992,000		6,992,000		5,133,000
Year four	4,089,000		4,089,000		2,465,000
Year five	1,991,000		1,991,000		2,332,000
Prior	6,355,000		6,355,000		5,474,000
Revolving Loans	26,958,000		26,958,000		24,048,000
Revolving Loans Converted to Term Loans	133,000		133,000		114,000
Total	61,012,000		61,012,000		57,010,000
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Year one	3,000		4,000
Year two	10,000		24,000
Year three	25,000		44,000
Year four	4,000		19,000
Year five	2,000		12,000
Prior	8,000		22,000
Revolving Loans	12,000		95,000
Revolving Loans Converted to Term Loans	0		0
Total	64,000		220,000
Commercial and industrial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	6,885,000		6,885,000		8,689,000
Year two	7,018,000		7,018,000		8,087,000
Year three	6,491,000		6,491,000		4,800,000
Year four	3,825,000		3,825,000		2,248,000
Year five	1,802,000		1,802,000		2,169,000
Prior	5,440,000		5,440,000		4,843,000
Revolving Loans	25,290,000		25,290,000		22,345,000
Revolving Loans Converted to Term Loans	78,000		78,000		70,000
Total	56,829,000		56,829,000		53,251,000
Commercial and industrial | Criticized accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	128,000		128,000		292,000
Year two	400,000		400,000		279,000
Year three	419,000		419,000		277,000
Year four	218,000		218,000		142,000
Year five	122,000		122,000		127,000
Prior	641,000		641,000		481,000
Revolving Loans	1,408,000		1,408,000		1,460,000
Revolving Loans Converted to Term Loans	37,000		37,000		31,000
Total	3,373,000		3,373,000		3,089,000
Commercial and industrial | Criticized nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	7,000		7,000		29,000
Year two	56,000		56,000		68,000
Year three	82,000		82,000		56,000
Year four	46,000		46,000		75,000
Year five	67,000		67,000		36,000
Prior	274,000		274,000		150,000
Revolving Loans	260,000		260,000		243,000
Revolving Loans Converted to Term Loans	18,000		18,000		13,000
Total	810,000		810,000		670,000
Commercial Real Estate
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Total	24,000	$ 52,000	92,000	$ 180,000
Commercial Real Estate | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	1,008,000		1,008,000		2,275,000
Year two	1,957,000		1,957,000		2,679,000
Year three	2,099,000		2,099,000		1,835,000
Year four	1,545,000		1,545,000		2,580,000
Year five	2,545,000		2,545,000		4,118,000
Prior	12,809,000		12,809,000		11,340,000
Revolving Loans	408,000		408,000		450,000
Revolving Loans Converted to Term Loans	0		0		0
Total	22,371,000		22,371,000		25,277,000
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Year one	0		0
Year two	0		4,000
Year three	0		0
Year four	0		0
Year five	0		5,000
Prior	24,000		67,000
Revolving Loans	0		0
Revolving Loans Converted to Term Loans	0		0
Total	24,000		76,000
Commercial Real Estate | Commercial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	1,003,000		1,003,000		2,048,000
Year two	1,648,000		1,648,000		1,742,000
Year three	1,296,000		1,296,000		1,367,000
Year four	1,190,000		1,190,000		2,011,000
Year five	1,861,000		1,861,000		3,059,000
Prior	10,308,000		10,308,000		8,491,000
Revolving Loans	383,000		383,000		440,000
Revolving Loans Converted to Term Loans	0		0		0
Total	17,689,000		17,689,000		19,158,000
Commercial Real Estate | Commercial | Criticized accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	5,000		5,000		227,000
Year two	308,000		308,000		891,000
Year three	752,000		752,000		465,000
Year four	323,000		323,000		456,000
Year five	648,000		648,000		966,000
Prior	2,044,000		2,044,000		2,238,000
Revolving Loans	24,000		24,000		7,000
Revolving Loans Converted to Term Loans	0		0		0
Total	4,104,000		4,104,000		5,250,000
Commercial Real Estate | Commercial | Criticized nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0		0		0
Year two	1,000		1,000		46,000
Year three	51,000		51,000		3,000
Year four	32,000		32,000		113,000
Year five	36,000		36,000		93,000
Prior	457,000		457,000		611,000
Revolving Loans	1,000		1,000		3,000
Revolving Loans Converted to Term Loans	0		0		0
Total	578,000		578,000		869,000
Commercial Real Estate | Residential builder and developer
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	342,000		342,000		531,000
Year two	366,000		366,000		270,000
Year three	124,000		124,000		74,000
Year four	26,000		26,000		6,000
Year five	4,000		4,000		61,000
Prior	28,000		28,000		12,000
Revolving Loans	102,000		102,000		119,000
Revolving Loans Converted to Term Loans	0		0		0
Total	992,000		992,000		1,073,000
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Year one	0		0
Year two	0		0
Year three	0		0
Year four	0		0
Year five	0		0
Prior	0		2,000
Revolving Loans	0		0
Revolving Loans Converted to Term Loans	0		0
Total	0		2,000
Commercial Real Estate | Residential builder and developer | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	333,000		333,000		530,000
Year two	323,000		323,000		252,000
Year three	78,000		78,000		41,000
Year four	19,000		19,000		6,000
Year five	4,000		4,000		2,000
Prior	11,000		11,000		12,000
Revolving Loans	101,000		101,000		116,000
Revolving Loans Converted to Term Loans	0		0		0
Total	869,000		869,000		959,000
Commercial Real Estate | Residential builder and developer | Criticized accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	9,000		9,000		1,000
Year two	43,000		43,000		18,000
Year three	46,000		46,000		30,000
Year four	6,000		6,000		0
Year five	0		0		59,000
Prior	16,000		16,000		0
Revolving Loans	1,000		1,000		3,000
Revolving Loans Converted to Term Loans	0		0		0
Total	121,000		121,000		111,000
Commercial Real Estate | Residential builder and developer | Criticized nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0		0		0
Year two	0		0		0
Year three	0		0		3,000
Year four	1,000		1,000		0
Year five	0		0		0
Prior	1,000		1,000		0
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total	2,000		2,000		3,000
Commercial Real Estate | Other commercial construction
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	87,000		87,000		866,000
Year two	1,377,000		1,377,000		1,771,000
Year three	1,891,000		1,891,000		1,051,000
Year four	746,000		746,000		1,110,000
Year five	521,000		521,000		1,261,000
Prior	644,000		644,000		562,000
Revolving Loans	54,000		54,000		32,000
Revolving Loans Converted to Term Loans	0		0		0
Total	5,320,000		5,320,000		6,653,000
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Year one	0		0
Year two	0		0
Year three	0		2,000
Year four	0		0
Year five	0		0
Prior	0		10,000
Revolving Loans	0		2,000
Revolving Loans Converted to Term Loans	0		0
Total	0		14,000
Commercial Real Estate | Other commercial construction | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	68,000		68,000		813,000
Year two	1,290,000		1,290,000		1,366,000
Year three	1,213,000		1,213,000		651,000
Year four	283,000		283,000		373,000
Year five	161,000		161,000		646,000
Prior	339,000		339,000		187,000
Revolving Loans	46,000		46,000		30,000
Revolving Loans Converted to Term Loans	0		0		0
Total	3,400,000		3,400,000		4,066,000
Commercial Real Estate | Other commercial construction | Criticized accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	19,000		19,000		53,000
Year two	87,000		87,000		391,000
Year three	673,000		673,000		390,000
Year four	454,000		454,000		691,000
Year five	311,000		311,000		565,000
Prior	284,000		284,000		326,000
Revolving Loans	8,000		8,000		0
Revolving Loans Converted to Term Loans	0		0		0
Total	1,836,000		1,836,000		2,416,000
Commercial Real Estate | Other commercial construction | Criticized nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0		0		0
Year two	0		0		14,000
Year three	5,000		5,000		10,000
Year four	9,000		9,000		46,000
Year five	49,000		49,000		50,000
Prior	21,000		21,000		49,000
Revolving Loans	0		0		2,000
Revolving Loans Converted to Term Loans	0		0		0
Total	$ 84,000		$ 84,000		$ 171,000

Loans and Leases and the Allo_6

Loans and Leases and the Allowance for Credit Losses - Summary of loans in Accrual and Nonaccrual Status (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	$ 15,279		$ 15,279		$ 18,423
Year two	15,890		15,890		21,683
Year three	18,767		18,767		15,025
Year four	12,542		12,542		10,555
Year five	8,957		8,957		10,062
Prior	30,732		30,732		27,464
Total	135,920		135,920		134,068
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Year one	12		19
Year two	20		55
Year three	35		76
Year four	10		42
Year five	7		31
Prior	39		127
Total	154	$ 122	497	$ 379
Residential Real Estate
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Total	1	1	4	4
Consumer:
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Total	65	$ 43	181	$ 125
Revolving Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	32,184		32,184		29,237
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Revolving Loans	30		144
Revolving Loans Converted to Term Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans	1,569		1,569		1,619
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Revolving Loans Converted to Term Loans	1		3
Residential | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	1,567		1,567		1,746
Year two	1,435		1,435		4,876
Year three	4,651		4,651		3,858
Year four	3,679		3,679		2,615
Year five	2,483		2,483		1,261
Prior	8,278		8,278		7,901
Total	22,196		22,196		22,353
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Year one	0		0
Year two	0		0
Year three	0		0
Year four	0		0
Year five	0		0
Prior	1		4
Total	1		4
Residential | Revolving Loans | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	103		103		96
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Revolving Loans	0		0
Residential | Revolving Loans Converted to Term Loans | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans	0		0		0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Revolving Loans Converted to Term Loans	0		0
Residential — limited documentation | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0		0		0
Year two	0		0		0
Year three	0		0		0
Year four	0		0		0
Year five	0		0		0
Prior	823		823		911
Total	823		823		911
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Year one	0		0
Year two	0		0
Year three	0		0
Year four	0		0
Year five	0		0
Prior	0		0
Total	0		0
Residential — limited documentation | Revolving Loans | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	0		0		0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Revolving Loans	0		0
Residential — limited documentation | Revolving Loans Converted to Term Loans | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans	0		0		0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Revolving Loans Converted to Term Loans	0		0
Home equity lines and loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0		0		0
Year two	0		0		0
Year three	0		0		2
Year four	2		2		2
Year five	2		2		13
Prior	100		100		106
Total	4,576		4,576		4,649
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Year one	0		0
Year two	0		0
Year three	0		0
Year four	0		0
Year five	0		0
Prior	0		0
Total	1		3
Home equity lines and loans | Revolving Loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	3,038		3,038		3,025
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Revolving Loans	0		0
Home equity lines and loans | Revolving Loans Converted to Term Loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans	1,434		1,434		1,501
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Revolving Loans Converted to Term Loans	1		3
Recreational finance | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	3,162		3,162		2,667
Year two	2,241		2,241		2,359
Year three	2,045		2,045		1,884
Year four	1,630		1,630		1,306
Year five	1,120		1,120		797
Prior	1,541		1,541		1,045
Total	11,739		11,739		10,058
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Year one	3		4
Year two	5		12
Year three	6		17
Year four	4		14
Year five	4		11
Prior	6		18
Total	28		76
Recreational finance | Revolving Loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	0		0		0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Revolving Loans	0		0
Recreational finance | Revolving Loans Converted to Term Loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans	0		0		0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Revolving Loans Converted to Term Loans	0		0
Automobile | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	1,883		1,883		1,073
Year two	869		869		1,114
Year three	841		841		1,067
Year four	743		743		438
Year five	273		273		206
Prior	134		134		94
Total	4,743		4,743		3,992
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Year one	1		1
Year two	2		6
Year three	2		6
Year four	1		5
Year five	1		2
Prior	0		2
Total	7		22
Automobile | Revolving Loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	0		0		0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Revolving Loans	0		0
Automobile | Revolving Loans Converted to Term Loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans	0		0		0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Revolving Loans Converted to Term Loans	0		0
Other | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	210		210		255
Year two	171		171		180
Year three	124		124		121
Year four	82		82		33
Year five	18		18		13
Prior	20		20		19
Total	2,148		2,148		2,092
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Year one	5		10
Year two	3		9
Year three	2		7
Year four	1		4
Year five	0		1
Prior	0		2
Total	29		80
Other | Revolving Loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	1,521		1,521		1,467
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Revolving Loans	18		47
Other | Revolving Loans Converted to Term Loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans	2		2		4
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Revolving Loans Converted to Term Loans	0		0
Current | Residential | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	1,550		1,550		1,726
Year two	1,415		1,415		4,709
Year three	4,481		4,481		3,732
Year four	3,559		3,559		2,543
Year five	2,427		2,427		1,215
Prior	7,510		7,510		7,060
Total	21,042		21,042		21,080
Current | Residential | Revolving Loans | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	100		100		95
Current | Residential | Revolving Loans Converted to Term Loans | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans	0		0		0
Current | Residential — limited documentation | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0		0		0
Year two	0		0		0
Year three	0		0		0
Year four	0		0		0
Year five	0		0		0
Prior	737		737		825
Total	737		737		825
Current | Residential — limited documentation | Revolving Loans | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	0		0		0
Current | Residential — limited documentation | Revolving Loans Converted to Term Loans | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans	0		0		0
Current | Home equity lines and loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0		0		0
Year two	0		0		0
Year three	0		0		2
Year four	2		2		2
Year five	2		2		13
Prior	95		95		98
Total	4,464		4,464		4,528
Current | Home equity lines and loans | Revolving Loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	3,038		3,038		3,022
Current | Home equity lines and loans | Revolving Loans Converted to Term Loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans	1,327		1,327		1,391
Current | Recreational finance | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	3,153		3,153		2,653
Year two	2,219		2,219		2,338
Year three	2,026		2,026		1,857
Year four	1,609		1,609		1,286
Year five	1,102		1,102		781
Prior	1,512		1,512		1,020
Total	11,621		11,621		9,935
Current | Recreational finance | Revolving Loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	0		0		0
Current | Recreational finance | Revolving Loans Converted to Term Loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans	0		0		0
Current | Automobile | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	1,875		1,875		1,063
Year two	856		856		1,096
Year three	826		826		1,047
Year four	729		729		427
Year five	267		267		198
Prior	127		127		87
Total	4,680		4,680		3,918
Current | Automobile | Revolving Loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	0		0		0
Current | Automobile | Revolving Loans Converted to Term Loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans	0		0		0
Current | Other | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	205		205		250
Year two	168		168		176
Year three	121		121		118
Year four	81		81		33
Year five	18		18		13
Prior	20		20		18
Total	2,066		2,066		2,003
Current | Other | Revolving Loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	1,452		1,452		1,392
Current | Other | Revolving Loans Converted to Term Loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans	1		1		3
30-89 days past due | Residential | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	17		17		18
Year two	10		10		120
Year three	114		114		88
Year four	76		76		52
Year five	35		35		28
Prior	415		415		457
Total	667		667		763
30-89 days past due | Residential | Revolving Loans | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	0		0		0
30-89 days past due | Residential | Revolving Loans Converted to Term Loans | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans	0		0		0
30-89 days past due | Residential — limited documentation | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0		0		0
Year two	0		0		0
Year three	0		0		0
Year four	0		0		0
Year five	0		0		0
Prior	29		29		31
Total	29		29		31
30-89 days past due | Residential — limited documentation | Revolving Loans | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	0		0		0
30-89 days past due | Residential — limited documentation | Revolving Loans Converted to Term Loans | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans	0		0		0
30-89 days past due | Home equity lines and loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0		0		0
Year two	0		0		0
Year three	0		0		0
Year four	0		0		0
Year five	0		0		0
Prior	2		2		3
Total	30		30		40
30-89 days past due | Home equity lines and loans | Revolving Loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	0		0		0
30-89 days past due | Home equity lines and loans | Revolving Loans Converted to Term Loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans	28		28		37
30-89 days past due | Recreational finance | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	8		8		11
Year two	17		17		16
Year three	14		14		19
Year four	16		16		14
Year five	14		14		11
Prior	21		21		16
Total	90		90		87
30-89 days past due | Recreational finance | Revolving Loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	0		0		0
30-89 days past due | Recreational finance | Revolving Loans Converted to Term Loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans	0		0		0
30-89 days past due | Automobile | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	7		7		8
Year two	11		11		15
Year three	13		13		17
Year four	11		11		9
Year five	5		5		6
Prior	5		5		5
Total	52		52		60
30-89 days past due | Automobile | Revolving Loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	0		0		0
30-89 days past due | Automobile | Revolving Loans Converted to Term Loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans	0		0		0
30-89 days past due | Other | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	3		3		3
Year two	2		2		3
Year three	2		2		2
Year four	1		1		0
Year five	0		0		0
Prior	0		0		1
Total	20		20		30
30-89 days past due | Other | Revolving Loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	11		11		20
30-89 days past due | Other | Revolving Loans Converted to Term Loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans	1		1		1
Accruing Loans Past Due 90 Days or More | Residential | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0		0		1
Year two	8		8		30
Year three	29		29		28
Year four	29		29		17
Year five	18		18		14
Prior	184		184		205
Total	268		268		295
Accruing Loans Past Due 90 Days or More | Residential | Revolving Loans | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	0		0		0
Accruing Loans Past Due 90 Days or More | Residential | Revolving Loans Converted to Term Loans | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans	0		0		0
Accruing Loans Past Due 90 Days or More | Residential — limited documentation | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0		0		0
Year two	0		0		0
Year three	0		0		0
Year four	0		0		0
Year five	0		0		0
Prior	0		0		0
Total	0		0		0
Accruing Loans Past Due 90 Days or More | Residential — limited documentation | Revolving Loans | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	0		0		0
Accruing Loans Past Due 90 Days or More | Residential — limited documentation | Revolving Loans Converted to Term Loans | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans	0		0		0
Accruing Loans Past Due 90 Days or More | Home equity lines and loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0		0		0
Year two	0		0		0
Year three	0		0		0
Year four	0		0		0
Year five	0		0		0
Prior	0		0		0
Total	0		0		0
Accruing Loans Past Due 90 Days or More | Home equity lines and loans | Revolving Loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	0		0		0
Accruing Loans Past Due 90 Days or More | Home equity lines and loans | Revolving Loans Converted to Term Loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans	0		0		0
Accruing Loans Past Due 90 Days or More | Recreational finance | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0		0		0
Year two	0		0		0
Year three	0		0		0
Year four	0		0		0
Year five	0		0		0
Prior	0		0		0
Total	0		0		0
Accruing Loans Past Due 90 Days or More | Recreational finance | Revolving Loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	0		0		0
Accruing Loans Past Due 90 Days or More | Recreational finance | Revolving Loans Converted to Term Loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans	0		0		0
Accruing Loans Past Due 90 Days or More | Automobile | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0		0		0
Year two	0		0		0
Year three	0		0		0
Year four	0		0		0
Year five	0		0		0
Prior	0		0		0
Total	0		0		0
Accruing Loans Past Due 90 Days or More | Automobile | Revolving Loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	0		0		0
Accruing Loans Past Due 90 Days or More | Automobile | Revolving Loans Converted to Term Loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans	0		0		0
Accruing Loans Past Due 90 Days or More | Other | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0		0		0
Year two	0		0		0
Year three	0		0		0
Year four	0		0		0
Year five	0		0		0
Prior	0		0		0
Total	7		7		7
Accruing Loans Past Due 90 Days or More | Other | Revolving Loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	7		7		7
Accruing Loans Past Due 90 Days or More | Other | Revolving Loans Converted to Term Loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans	0		0		0
Nonaccrual | Residential | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0		0		1
Year two	2		2		17
Year three	27		27		10
Year four	15		15		3
Year five	3		3		4
Prior	169		169		179
Total	219		219		215
Nonaccrual | Residential | Revolving Loans | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	3		3		1
Nonaccrual | Residential | Revolving Loans Converted to Term Loans | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans	0		0		0
Nonaccrual | Residential — limited documentation | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0		0		0
Year two	0		0		0
Year three	0		0		0
Year four	0		0		0
Year five	0		0		0
Prior	57		57		55
Total	57		57		55
Nonaccrual | Residential — limited documentation | Revolving Loans | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	0		0		0
Nonaccrual | Residential — limited documentation | Revolving Loans Converted to Term Loans | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans	0		0		0
Nonaccrual | Home equity lines and loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0		0		0
Year two	0		0		0
Year three	0		0		0
Year four	0		0		0
Year five	0		0		0
Prior	3		3		5
Total	82		82		81
Nonaccrual | Home equity lines and loans | Revolving Loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	0		0		3
Nonaccrual | Home equity lines and loans | Revolving Loans Converted to Term Loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans	79		79		73
Nonaccrual | Recreational finance | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	1		1		3
Year two	5		5		5
Year three	5		5		8
Year four	5		5		6
Year five	4		4		5
Prior	8		8		9
Total	28		28		36
Nonaccrual | Recreational finance | Revolving Loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	0		0		0
Nonaccrual | Recreational finance | Revolving Loans Converted to Term Loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans	0		0		0
Nonaccrual | Automobile | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	1		1		2
Year two	2		2		3
Year three	2		2		3
Year four	3		3		2
Year five	1		1		2
Prior	2		2		2
Total	11		11		14
Nonaccrual | Automobile | Revolving Loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	0		0		0
Nonaccrual | Automobile | Revolving Loans Converted to Term Loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans	0		0		0
Nonaccrual | Other | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	2		2		2
Year two	1		1		1
Year three	1		1		1
Year four	0		0		0
Year five	0		0		0
Prior	0		0		0
Total	55		55		52
Nonaccrual | Other | Revolving Loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	51		51		48
Nonaccrual | Other | Revolving Loans Converted to Term Loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans	$ 0		$ 0		$ 0

Loans and Leases and the Allo_7

Loans and Leases and the Allowance for Credit Losses - Changes in Allowance for Credit Losses (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 2,204	$ 1,998	$ 2,129	$ 1,925
Provision for credit losses	120	150	470	420
Charge-offs	154	122	497	379
Recoveries	34	26	102	86
Net charge-offs	(120)	(96)	(395)	(293)
Ending balance	2,204	2,052	2,204	2,052
Commercial and industrial
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	790	583	620	568
Provision for credit losses	52	40	365	73
Charge-offs	64	26	220	70
Recoveries	14	7	27	33
Net charge-offs	(50)	(19)	(193)	(37)
Ending balance	792	604	792	604
Commercial Real Estate
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	658	694	764	611
Provision for credit losses	1	79	(60)	287
Charge-offs	24	52	92	180
Recoveries	4	5	27	8
Net charge-offs	(20)	(47)	(65)	(172)
Ending balance	639	726	639	726
Residential Real Estate
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	110	118	116	115
Provision for credit losses	(5)	(3)	(11)	(1)
Charge-offs	1	1	4	4
Recoveries	1	0	4	4
Net charge-offs	0	(1)	0	0
Ending balance	105	114	105	114
Consumer:
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	646	603	629	631
Provision for credit losses	72	34	176	61
Charge-offs	65	43	181	125
Recoveries	15	14	44	41
Net charge-offs	(50)	(29)	(137)	(84)
Ending balance	$ 668	$ 608	$ 668	$ 608

Loans and Leases and the Allo_8

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		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Jun. 30, 2024	Jan. 01, 2024	Jun. 30, 2023	Jan. 01, 2023
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	$ 1,235	$ 1,038	$ 1,235	$ 1,038
Amortized Cost without Allowance	691	1,304	691	1,304
Total	1,926	2,342	1,926	2,342
Amortized Cost					$ 2,024	$ 2,166	$ 2,436	$ 2,439
Interest Income Recognized	17	22	64	52
Commercial and industrial
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	610	366	610	366
Amortized Cost without Allowance	200	300	200	300
Total	810	666	810	666
Amortized Cost					805	670	607	504
Interest Income Recognized	5	7	14	13
Commercial Real Estate | Commercial
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	348	417	348	417
Amortized Cost without Allowance	230	638	230	638
Total	578	1,055	578	1,055
Amortized Cost					707	869	1,192	1,240
Interest Income Recognized	5	9	31	18
Commercial Real Estate | Residential builder and developer
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	2	3	2	3
Amortized Cost without Allowance	0	0	0	0
Total	2	3	2	3
Amortized Cost					2	3	1	1
Interest Income Recognized	1	0	1	0
Commercial Real Estate | Other commercial construction
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	21	4	21	4
Amortized Cost without Allowance	63	132	63	132
Total	84	136	84	136
Amortized Cost					77	171	146	125
Interest Income Recognized	0	0	3	2
Residential Real Estate | Residential
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	113	91	113	91
Amortized Cost without Allowance	106	150	106	150
Total	219	241	219	241
Amortized Cost					205	215	239	272
Interest Income Recognized	4	3	10	12
Residential Real Estate | Residential — limited documentation
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	22	22	22	22
Amortized Cost without Allowance	35	40	35	40
Total	57	62	57	62
Amortized Cost					55	55	67	78
Interest Income Recognized	0	1	1	1
Consumer: | Home equity lines and loans
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	39	48	39	48
Amortized Cost without Allowance	43	30	43	30
Total	82	78	82	78
Amortized Cost					79	81	77	85
Interest Income Recognized	2	2	4	6
Consumer: | Recreational finance
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	17	21	17	21
Amortized Cost without Allowance	11	10	11	10
Total	28	31	28	31
Amortized Cost					25	36	32	45
Interest Income Recognized	0	0	0	0
Consumer: | Automobile
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	8	12	8	12
Amortized Cost without Allowance	3	4	3	4
Total	11	16	11	16
Amortized Cost					11	14	22	40
Interest Income Recognized	0	0	0	0
Consumer: | Other
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	55	54	55	54
Amortized Cost without Allowance	0	0	0	0
Total	55	54	55	54
Amortized Cost					$ 58	$ 52	$ 53	$ 49
Interest Income Recognized	$ 0	$ 0	$ 0	$ 0

Loans and Leases and the Allo_9

Loans and Leases and the Allowance for Credit Losses - Loan Modification Activities to Borrowers Experiencing Financial Difficulty on Financing Receivables (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Modified in period	$ 330,000	$ 592,000	$ 996,000	$ 1,198,000
Percent of Total Loan Class	0.24%	0.45%	0.73%	0.91%
Commercial and industrial
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Modified in period	$ 117,000	$ 41,000	$ 270,000	$ 127,000
Percent of Total Loan Class	0.19%	0.07%	0.44%	0.23%
Commercial | Commercial Real Estate
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Modified in period	$ 164,000	$ 278,000	$ 425,000	$ 423,000
Percent of Total Loan Class	0.73%	1.07%	1.90%	1.63%
Residential builder and developer | Commercial Real Estate
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Modified in period	$ 2,000	$ 0	$ 13,000	$ 71,000
Percent of Total Loan Class	0.17%	0%	1.27%	6.42%
Other commercial construction | Commercial Real Estate
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Modified in period	$ 2,000	$ 216,000	$ 139,000	$ 440,000
Percent of Total Loan Class	0.03%	3.20%	2.62%	6.54%
Residential | Residential Real Estate
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Modified in period	$ 42,000	$ 55,000	$ 139,000	$ 125,000
Percent of Total Loan Class	0.19%	0.24%	0.63%	0.56%
Residential — limited documentation | Residential Real Estate
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Modified in period	$ 3,000	$ 2,000	$ 7,000	$ 11,000
Percent of Total Loan Class	0.41%	0.18%	0.86%	1.11%
Home equity lines and loans | Consumer:
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Modified in period	$ 0	$ 0	$ 2,000	$ 1,000
Percent of Total Loan Class	0%	0%	0.04%	0.02%
Recreational finance | Consumer:
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Modified in period	$ 0	$ 0	$ 1,000	$ 0
Percent of Total Loan Class	0%	0%	0.01%	0%
Automobile | Consumer:
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Modified in period	$ 0	$ 0	$ 0	$ 0
Percent of Total Loan Class	0%	0%	0%	0%
Other | Consumer:
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Modified in period	$ 0	$ 0	$ 0	$ 0
Percent of Total Loan Class	0%	0%	0%	0%
Term Extension
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Modified in period	$ 295,000	$ 576,000	$ 892,000	$ 1,137,000
Term Extension | Commercial and industrial
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Modified in period	92,000	40,000	190,000	115,000
Term Extension | Commercial | Commercial Real Estate
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Modified in period	163,000	272,000	420,000	409,000
Term Extension | Residential builder and developer | Commercial Real Estate
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Modified in period	2,000	0	13,000	70,000
Term Extension | Other commercial construction | Commercial Real Estate
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Modified in period	2,000	216,000	139,000	432,000
Term Extension | Residential | Residential Real Estate
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Modified in period	34,000	47,000	123,000	104,000
Term Extension | Residential — limited documentation | Residential Real Estate
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Modified in period	2,000	1,000	5,000	6,000
Term Extension | Home equity lines and loans | Consumer:
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Modified in period	0	0	1,000	1,000
Term Extension | Recreational finance | Consumer:
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Modified in period	0	0	1,000	0
Term Extension | Automobile | Consumer:
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Modified in period	0	0	0	0
Term Extension | Other | Consumer:
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Modified in period	0	0	0	0
Other (a)
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Modified in period	29,000	8,000	91,000	32,000
Other (a) | Commercial and industrial
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Modified in period	23,000	0	78,000	10,000
Other (a) | Commercial | Commercial Real Estate
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Modified in period	1,000	0	1,000	0
Other (a) | Residential builder and developer | Commercial Real Estate
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Modified in period	0	0	0	1,000
Other (a) | Other commercial construction | Commercial Real Estate
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Modified in period	0	0	0	0
Other (a) | Residential | Residential Real Estate
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Modified in period	4,000	7,000	10,000	17,000
Other (a) | Residential — limited documentation | Residential Real Estate
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Modified in period	1,000	1,000	2,000	4,000
Other (a) | Home equity lines and loans | Consumer:
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Modified in period	0	0	0	0
Other (a) | Recreational finance | Consumer:
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Modified in period	0	0	0	0
Other (a) | Automobile | Consumer:
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Modified in period	0	0	0	0
Other (a) | Other | Consumer:
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Modified in period	0	0	0	0
Combination of Modification Types
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Modified in period	6,000	8,000	13,000	29,000
Combination of Modification Types | Commercial and industrial
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Modified in period	2,000	1,000	2,000	2,000
Combination of Modification Types | Commercial | Commercial Real Estate
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Modified in period	0	6,000	4,000	14,000
Combination of Modification Types | Residential builder and developer | Commercial Real Estate
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Modified in period	0	0	0	0
Combination of Modification Types | Other commercial construction | Commercial Real Estate
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Modified in period	0	0	0	8,000
Combination of Modification Types | Residential | Residential Real Estate
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Modified in period	4,000	1,000	6,000	4,000
Combination of Modification Types | Residential — limited documentation | Residential Real Estate
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Modified in period	0	0	0	1,000
Combination of Modification Types | Home equity lines and loans | Consumer:
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Modified in period	0	0	1,000	0
Combination of Modification Types | Recreational finance | Consumer:
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Modified in period	0	0	0	0
Combination of Modification Types | Automobile | Consumer:
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Modified in period	0	0	0	0
Combination of Modification Types | Other | Consumer:
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Modified in period	$ 0	$ 0	$ 0	$ 0

Loans and Leases and the All_10

Loans and Leases and the Allowance for Credit Losses - Summary of Payment Status of Loans Modified (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Sep. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	$ 1,247,000	$ 1,198,000
Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	986,000	1,114,000
30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	211,000	56,000
Accruing Loans Past Due 90 Days or More
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	50,000	28,000
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	317,000	127,000
Commercial and industrial | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	308,000	109,000
Commercial and industrial | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	5,000	4,000
Commercial and industrial | Accruing Loans Past Due 90 Days or More
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	4,000	14,000
Commercial Real Estate | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	515,000	423,000
Commercial Real Estate | Commercial | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	422,000	406,000
Commercial Real Estate | Commercial | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	84,000	17,000
Commercial Real Estate | Commercial | Accruing Loans Past Due 90 Days or More
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	9,000	0
Commercial Real Estate | Residential builder and developer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	14,000	71,000
Commercial Real Estate | Residential builder and developer | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	13,000	71,000
Commercial Real Estate | Residential builder and developer | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	1,000	0
Commercial Real Estate | Residential builder and developer | Accruing Loans Past Due 90 Days or More
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	0	0
Commercial Real Estate | Other commercial construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	215,000	440,000
Commercial Real Estate | Other commercial construction | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	141,000	440,000
Commercial Real Estate | Other commercial construction | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	74,000	0
Commercial Real Estate | Other commercial construction | Accruing Loans Past Due 90 Days or More
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	0	0
Residential Real Estate | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	175,000	125,000
Residential Real Estate | Residential | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	93,000	79,000
Residential Real Estate | Residential | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	45,000	34,000
Residential Real Estate | Residential | Accruing Loans Past Due 90 Days or More
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	37,000	12,000
Residential Real Estate | Residential — limited documentation
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	8,000	11,000
Residential Real Estate | Residential — limited documentation | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	6,000	8,000
Residential Real Estate | Residential — limited documentation | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	2,000	1,000
Residential Real Estate | Residential — limited documentation | Accruing Loans Past Due 90 Days or More
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	0	2,000
Consumer: | Home equity lines and loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	2,000	1,000
Consumer: | Home equity lines and loans | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	2,000	1,000
Consumer: | Home equity lines and loans | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	0	0
Consumer: | Home equity lines and loans | Accruing Loans Past Due 90 Days or More
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	0	0
Consumer: | Recreational finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	1,000	0
Consumer: | Recreational finance | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	1,000	0
Consumer: | Recreational finance | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	0	0
Consumer: | Recreational finance | Accruing Loans Past Due 90 Days or More
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	0	0
Consumer: | Automobile
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	0	0
Consumer: | Automobile | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	0	0
Consumer: | Automobile | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	0	0
Consumer: | Automobile | Accruing Loans Past Due 90 Days or More
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	0	0
Consumer: | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	0	0
Consumer: | Other | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	0	0
Consumer: | Other | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	0	0
Consumer: | Other | Accruing Loans Past Due 90 Days or More
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	$ 0	$ 0

Borrowings - Schedule of Borrow

Borrowings - Schedule of Borrowings (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Short-term borrowings
Federal funds purchased and repurchase agreements	$ 105	$ 316
FHLB advances	2,500	5,000
Total short-term borrowings	2,605	5,316
Long-term borrowings
Senior notes	3,744	3,741
FHLB advances	2,004	5
Subordinated notes	482	873
Asset-backed notes	1,354	474
Other	10	10
Total long-term borrowings	11,583	8,201
M&T
Long-term borrowings
Senior notes	3,371	2,482
Subordinated notes	75	76
Junior subordinated debentures — M&T	$ 543	$ 540

Borrowings - Additional Informa

Borrowings - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended
	Mar. 31, 2024	Feb. 29, 2024	Oct. 31, 2023	Jan. 31, 2023	Sep. 30, 2024	Aug. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Asset-backed notes					$ 1,354		$ 474
Short-term borrowings					2,605		5,316
FHLB advances					2,004		5
Senior notes					3,744		3,741
Long-term borrowings					11,583		$ 8,201
Secured Debt
Debt Instrument [Line Items]
Long-term debt term (in years)	2 years
Weighted average interest rate	5.29%
Secured Debt | Third Party Investors
Debt Instrument [Line Items]
Asset-backed notes	$ 511
FHLB of New York
Debt Instrument [Line Items]
FHLB advances		$ 2,000
Variable interest rate of debt instrument		0.25%
Available line of credit					15,800
FRB of New York
Debt Instrument [Line Items]
Available line of credit					$ 23,800
4.874% Asset-Backed Notes | Secured Debt | Subsidiaries
Debt Instrument [Line Items]
Asset-backed notes						$ 650
Long-term debt term (in years)						2 years
Weighted average interest rate						4.87%
5.053% Fixed Rate Senior Notes Due to Mature in January 2034
Debt Instrument [Line Items]
Variable interest rate of debt instrument	2.26%
Senior notes	$ 850
Interest rate of debt instrument	6.082%
Senior notes maturity date				Jan. 31, 2034
4.65% Fixed Rate Senior Notes Due to Mature in January 2026
Debt Instrument [Line Items]
Senior notes maturity date				Jan. 31, 2026
4.70% Fixed Rate Senior Notes Due to Mature in January 2028
Debt Instrument [Line Items]
Senior notes maturity date				Jan. 31, 2028
7.41% Fixed Rate Senior Notes Due to Mature in October 2029
Debt Instrument [Line Items]
Senior notes maturity date			Jan. 31, 2034

Shareholders' Equity - Addition

Shareholders' Equity - Additional Information (Detail) - $ / shares			9 Months Ended
	Aug. 01, 2024	May 13, 2024	Sep. 30, 2024	Dec. 31, 2023
Class of Stock [Line Items]
Preferred stock, shares authorized			20,000,000	20,000,000
Preferred stock, par value			$ 1	$ 1
Preferred Series E
Class of Stock [Line Items]
Preferred stock, liquidation preference per share (in USD per share)			$ 1,000	1,000
Preferred Series F
Class of Stock [Line Items]
Preferred stock dividend rate (as a percent)			5.125%
Preferred stock, liquidation preference per share (in USD per share)			$ 10,000	10,000
Preferred stock. dividend rate spread (as a percent)			3.78%
Preferred Series G
Class of Stock [Line Items]
Preferred stock dividend rate (as a percent)	7.246%		5%
Preferred stock, liquidation preference per share (in USD per share)			$ 10,000	10,000
Preferred stock. dividend rate spread (as a percent)			3.174%
Series H Preferred Stock
Class of Stock [Line Items]
Preferred stock dividend rate (as a percent)			5.625%
Preferred stock, liquidation preference per share (in USD per share)			$ 25	25
Preferred stock. dividend rate spread (as a percent)			4.28%
Preferred Series I
Class of Stock [Line Items]
Preferred stock dividend rate (as a percent)			3.50%
Preferred stock, liquidation preference per share (in USD per share)			$ 10,000	10,000
Preferred stock. dividend rate spread (as a percent)			2.679%
Series J Preferred Stock
Class of Stock [Line Items]
Issuance of Series J preferred stock (in shares)		75,000
Preferred stock dividend rate (as a percent)		7.50%	7.50%
Preferred stock, liquidation preference per share (in USD per share)		$ 10,000	$ 10,000	$ 10,000

Shareholders' Equity - Issued a

Shareholders' Equity - Issued and Outstanding Preferred Stock (Detail) - USD ($) $ / shares in Units, $ in Millions	Sep. 30, 2024	May 13, 2024	Dec. 31, 2023
Class of Stock [Line Items]
Carrying Value	$ 2,394		$ 2,011
Preferred Series E
Class of Stock [Line Items]
Preferred stock, liquidation preference per share (in USD per share)	$ 1,000		$ 1,000
Preferred stock, shares issued (in shares)	0		350,000
Preferred stock, shares outstanding (in shares)	0		350,000
Carrying Value	$ 0		$ 350
Preferred stock outstanding (in USD)	$ 0		$ 350
Preferred Series F
Class of Stock [Line Items]
Preferred stock, liquidation preference per share (in USD per share)	$ 10,000		$ 10,000
Preferred stock, shares issued (in shares)	50,000		50,000
Preferred stock, shares outstanding (in shares)	50,000		50,000
Carrying Value	$ 500		$ 500
Preferred stock outstanding (in USD)	$ 500		$ 500
Preferred Series G
Class of Stock [Line Items]
Preferred stock, liquidation preference per share (in USD per share)	$ 10,000		$ 10,000
Preferred stock, shares issued (in shares)	40,000		40,000
Preferred stock, shares outstanding (in shares)	40,000		40,000
Carrying Value	$ 400		$ 400
Preferred stock outstanding (in USD)	$ 400		$ 400
Series H Preferred Stock
Class of Stock [Line Items]
Preferred stock, liquidation preference per share (in USD per share)	$ 25		$ 25
Preferred stock, shares issued (in shares)	10,000,000		10,000,000
Preferred stock, shares outstanding (in shares)	10,000,000		10,000,000
Carrying Value	$ 261		$ 261
Preferred stock outstanding (in USD)	$ 261		$ 261
Preferred Series I
Class of Stock [Line Items]
Preferred stock, liquidation preference per share (in USD per share)	$ 10,000		$ 10,000
Preferred stock, shares issued (in shares)	50,000		50,000
Preferred stock, shares outstanding (in shares)	50,000		50,000
Carrying Value	$ 500		$ 500
Preferred stock outstanding (in USD)	$ 500		$ 500
Series J Preferred Stock
Class of Stock [Line Items]
Preferred stock, liquidation preference per share (in USD per share)	$ 10,000	$ 10,000	$ 10,000
Preferred stock, shares issued (in shares)	75,000		0
Preferred stock, shares outstanding (in shares)	75,000		0
Carrying Value	$ 733		$ 0
Preferred stock outstanding (in USD)	$ 733		$ 0

Revenue from Contracts with C_3

Revenue from Contracts with Customers - Additional Information (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Disaggregation Of Revenue [Line Items]
Uncollected amounts receivable	$ 69	$ 68
Maximum | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2024-10-01
Disaggregation Of Revenue [Line Items]
Period of satisfaction of contract with customer	1 year
Accrued interest and other liabilities
Disaggregation Of Revenue [Line Items]
Contract with customer	$ 53	$ 54

Revenue from Contracts with C_4

Revenue from Contracts with Customers - Summary of Sources of Noninterest Income that are Subject to Revenue Recognition Accounting Guidance (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	$ 394	$ 360	$ 1,149	$ 1,119
Service charges on deposit accounts
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	132	121	383	354
Trust income
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	170	155	500	521
Brokerage services income
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	32	27	91	76
Merchant discount and credit card interchange fees
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	41	43	121	122
Other
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	19	14	54	46
Commercial Bank
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	69	67	205	190
Commercial Bank | Service charges on deposit accounts
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	40	38	120	109
Commercial Bank | Trust income
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	1	0	3	1
Commercial Bank | Brokerage services income
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	2	1	5	4
Commercial Bank | Merchant discount and credit card interchange fees
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	18	21	54	57
Commercial Bank | Other
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	8	7	23	19
Retail Bank
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	123	112	353	333
Retail Bank | Service charges on deposit accounts
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	92	83	263	245
Retail Bank | Trust income
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Retail Bank | Brokerage services income
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Retail Bank | Merchant discount and credit card interchange fees
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	23	22	67	65
Retail Bank | Other
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	8	7	23	23
Institutional Services and Wealth Management
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	202	181	591	596
Institutional Services and Wealth Management | Service charges on deposit accounts
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Institutional Services and Wealth Management | Trust income
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	169	155	497	520
Institutional Services and Wealth Management | Brokerage services income
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	30	26	86	72
Institutional Services and Wealth Management | Merchant discount and credit card interchange fees
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Institutional Services and Wealth Management | Other
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	$ 3	$ 0	$ 8	$ 4

Pension Plans and Other Postr_3

Pension Plans and Other Postretirement Benefits - Net Periodic Defined Benefit Cost for Defined Benefit Plans (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 3,000	$ 3,000	$ 8,000	$ 9,000
Interest cost on projected benefit obligation	28,000	29,000	86,000	87,000
Expected return on plan assets	(50,000)	(50,000)	(151,000)	(151,000)
Amortization of prior service credit	0	0	0	0
Amortization of net actuarial gain	0	(1,000)	(1,000)	(2,000)
Net periodic benefit	$ (19,000)	$ (19,000)	$ (58,000)	$ (57,000)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other costs of operations	Other costs of operations	Other costs of operations	Other costs of operations
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Amortization of Prior Service Cost (Credit), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other costs of operations	Other costs of operations	Other costs of operations	Other costs of operations
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0	$ 1,000	$ 1,000
Interest cost on projected benefit obligation	1,000	1,000	2,000	2,000
Expected return on plan assets	0	0	0	0
Amortization of prior service credit	(1,000)	0	(2,000)	(1,000)
Amortization of net actuarial gain	(1,000)	(1,000)	(2,000)	(2,000)
Net periodic benefit	$ (1,000)	$ 0	$ (1,000)	$ 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other costs of operations	Other costs of operations	Other costs of operations	Other costs of operations
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Amortization of Prior Service Cost (Credit), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other costs of operations	Other costs of operations	Other costs of operations	Other costs of operations

Pension Plans and Other Postr_4

Pension Plans and Other Postretirement Benefits - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Retirement Benefits [Abstract]
Defined contribution pension and retirement savings plans total expense	$ 39	$ 37	$ 124	$ 118

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		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Income available to common shareholders:
Net income	$ 721	$ 690	$ 1,907	$ 2,259
Less: Preferred stock dividends	(47)	(25)	(99)	(75)
Net income available to common equity	674	665	1,808	2,184
Less: Income attributable to unvested stock-based compensation awards	0	(1)	(3)	(4)
Net income available to common shareholders	$ 674	$ 664	$ 1,805	$ 2,180
Weighted-average shares outstanding:
Common shares outstanding (including common stock issuable) and unvested stock-based compensation awards	167,011	166,217	167,010	166,787
Less: Unvested stock-based compensation awards	(340)	(308)	(316)	(299)
Weighted-average shares outstanding (in shares)	166,671	165,909	166,694	166,488
Basic earnings per common share (in USD per share)	$ 4.04	$ 4	$ 10.83	$ 13.09

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		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Earnings Per Share [Abstract]
Net income available to common equity	$ 674	$ 665	$ 1,808	$ 2,184
Less: Income attributable to unvested stock-based compensation awards	0	(1)	(3)	(4)
Net income available to common shareholders	$ 674	$ 664	$ 1,805	$ 2,180
Adjusted weighted-average shares outstanding:
Common shares outstanding (including common stock issuable) and unvested stock-based compensation awards	167,011	166,217	167,010	166,787
Less: Unvested stock-based compensation awards	(340)	(308)	(316)	(299)
Plus: Incremental shares from assumed conversion of stock-based compensation awards	896	661	743	605
Adjusted weighted-average shares outstanding (in shares)	167,567	166,570	167,437	167,093
Diluted earnings per common share (in USD per share)	$ 4.02	$ 3.98	$ 10.78	$ 13.05

Earnings Per Common Share - Add

Earnings Per Common Share - Additional Information (Detail) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earnings per share	490,695	1,745,348	1,008,825	1,800,385

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	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 26,957	$ 25,318
Ending balance	28,876	26,196
AOCI Attributable to Parent
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Equity, attributable to parent, beginning balance	(616)	(1,066)
Beginning balance	157	276
Beginning balance	(459)	(790)
Other comprehensive income (loss) before reclassifications:	284	(368)
Other comprehensive income (loss) before reclassifications, tax	(72)	92
OCI, before reclassifications, net of tax, attributable to parent	212	(276)
Total other comprehensive income (loss)	580	(200)
Deferred income taxes and credits	(148)	48
Other comprehensive income (loss), net of Tax, Portion attributable to parent	432	(152)
Equity, attributable to parent, ending balance	(36)	(1,266)
Ending balance	9	324
Ending balance	(27)	(942)
Investment Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Equity, attributable to parent, beginning balance	(251)	(444)
Beginning balance	(187)
Other comprehensive income (loss) before reclassifications:	307	(2)
Other comprehensive income (loss) before reclassifications, tax	(78)	1
OCI, before reclassifications, net of tax, attributable to parent	229	(1)
Amounts reclassified from accumulated other comprehensive income (loss) that (increase) decrease net income:	13
Reclassification from AOCI, current period, tax	(4)
Reclassification from AOCI, current period, net of tax, attributable to parent	9
Total other comprehensive income (loss)	320	(2)
Equity, attributable to parent, ending balance	69	(446)
Ending balance	51
Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Equity, attributable to parent, beginning balance	(203)	(336)
Beginning balance	(151)
Other comprehensive income (loss) before reclassifications:	(26)	(366)
Other comprehensive income (loss) before reclassifications, tax	7	91
OCI, before reclassifications, net of tax, attributable to parent	(19)	(275)
Amounts reclassified from accumulated other comprehensive income (loss) that (increase) decrease net income:	288	173
Reclassification from AOCI, current period, tax	(73)	(44)
Reclassification from AOCI, current period, net of tax, attributable to parent	215	129
Total other comprehensive income (loss)	262	(193)
Equity, attributable to parent, ending balance	59	(529)
Ending balance	45
Defined Benefit Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Equity, attributable to parent, beginning balance	(155)	(273)
Beginning balance	(115)
Other comprehensive income (loss) before reclassifications:	0	0
Total other comprehensive income (loss)	(5)	(5)
Equity, attributable to parent, ending balance	(160)	(278)
Ending balance	(119)
Prior Service Credit
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Amounts reclassified from accumulated other comprehensive income (loss) that (increase) decrease net income:	(2)	(1)
Reclassification from AOCI, current period, tax	0	0
Reclassification from AOCI, current period, net of tax, attributable to parent	(2)	(1)
Actuarial Gains
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Amounts reclassified from accumulated other comprehensive income (loss) that (increase) decrease net income:	(3)	(4)
Reclassification from AOCI, current period, tax	1	0
Reclassification from AOCI, current period, net of tax, attributable to parent	(2)	(4)
Other
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Equity, attributable to parent, beginning balance	(7)	(13)
Beginning balance	(6)
Other comprehensive income (loss) before reclassifications:	3	0
Other comprehensive income (loss) before reclassifications, tax	(1)
OCI, before reclassifications, net of tax, attributable to parent	2
Total other comprehensive income (loss)	3	0
Equity, attributable to parent, ending balance	(4)	$ (13)
Ending balance	$ (4)

Comprehensive Income - Accumula

Comprehensive Income - Accumulated Other Comprehensive Income (Loss), Net (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 28,424	$ 25,801	$ 26,957	$ 25,318
Net loss during period	524	(77)	432	(152)
Ending balance	28,876	26,196	28,876	26,196
Investment Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			(187)
Net loss during period			238
Ending balance	51		51
Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			(151)
Net loss during period			196
Ending balance	45		45
Defined Benefit Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			(115)
Net loss during period			(4)
Ending balance	(119)		(119)
Other
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			(6)
Net loss during period			2
Ending balance	(4)		(4)
Accumulated Other Comprehensive Income (Loss), Net
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(551)	(865)	(459)	(790)
Net loss during period			432
Ending balance	$ (27)	$ (942)	$ (27)	$ (942)

Derivative Financial Instrume_3

Derivative Financial Instruments - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended				9 Months Ended		12 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023	Jun. 30, 2023	Dec. 31, 2022
Derivative [Line Items]
Notional amounts of derivative contracts entered into for trading account purposes	$ 30,570				$ 30,570		$ 26,977
Shareholders' equity	28,876	$ 28,424		$ 26,196	28,876	$ 26,196	26,957	$ 25,801	$ 25,318
Aggregate fair value of derivative financial instruments in asset position	94				94		179
Collateral relating to net asset positions	87				87		179
Reduction in estimated fair value of interest rate contracts in asset position					(496)		(783)
Reduction in estimated fair value of interest rate contracts in liability position					(51)		(32)
Cash Flow Hedges
Derivative [Line Items]
Shareholders' equity	45				45		(151)
Equity, Attributable to Parent, Before Tax	59			(529)	59	(529)	(203)		$ (336)
Fair value hedges:
Derivative [Line Items]
Impact of estimated fair value gain (losses) on hedging instruments			$ 43		15
Cash flow hedges:
Derivative [Line Items]
Impact of estimated fair value gain (losses) on hedging instruments			$ 214		89
Clearinghouse Credit Facilities
Derivative [Line Items]
Amount of initial margin posted	154				154		129
Interest Income
Derivative [Line Items]
Change in cash flow hedges derivative instruments, fair value net		$ (102)		(65)
Changes in Cash Flow Hedges Derivative Instruments At Fair Value Net	(288)			(173)	(288)	(173)
Interest rate swap agreements
Derivative [Line Items]
Cash flow hedge reclassification before tax	$ (115)			$ (79)	$ (328)	$ (211)
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 and Dividend Income, Operating	Interest and Dividend Income, Operating
Interest rate swap agreements | Maturity Period 2025
Derivative [Line Items]
Equity, Attributable to Parent, Before Tax	$ (78)				$ (78)
Interest rate swap agreements | Maturity Period 2026
Derivative [Line Items]
Equity, Attributable to Parent, Before Tax	48				48
Interest rate swap agreements | Maturity Period 2027
Derivative [Line Items]
Equity, Attributable to Parent, Before Tax	90				90
Interest rate swap agreements | Maturity Period 2028
Derivative [Line Items]
Equity, Attributable to Parent, Before Tax	1				1
Interest Rate Contracts | Not Designated as Hedging Instrument
Derivative [Line Items]
Notional amounts of derivative contracts entered into for trading account purposes	42,500				42,500		44,400
Foreign exchange and other option and futures contracts | Not Designated as Hedging Instrument
Derivative [Line Items]
Notional amounts of derivative contracts entered into for trading account purposes	1,400				1,400		1,500
Forward-Starting Interest Rate Swap Agreements | Fair value hedges:
Derivative [Line Items]
Notional amounts of derivative contracts entered into for trading account purposes	1,900				1,900		1,000
Forward-Starting Interest Rate Swap Agreements | Cash flow hedges:
Derivative [Line Items]
Notional amounts of derivative contracts entered into for trading account purposes	$ 6,600				$ 6,600		$ 9,000

Derivative Financial Instrume_4

Derivative Financial Instruments - Information about Interest Rate Swap Agreements (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Derivative [Line Items]
Notional Amount	$ 30,570,000	$ 26,977,000
Average Maturity (in years)	2 years	2 years 2 months 12 days
Estimated fair value gain (loss)	$ (38,000)	$ 10,000
Interest Payments On Variable Rate Commercial Real Estate Loans | Cash flow hedges:
Derivative [Line Items]
Notional Amount	$ 26,705,000	$ 23,977,000
Average Maturity (in years)	1 year 6 months	1 year 8 months 12 days
Fixed	3.39%	3.45%
Variable	5.02%	5.36%
Estimated fair value gain (loss)	$ (30,000)	$ 11,000
Fixed Rate Long-Term Borrowings | Fair value hedges:
Derivative [Line Items]
Notional Amount	$ 3,850,000	$ 3,000,000
Average Maturity (in years)	5 years 4 months 24 days	5 years 9 months 18 days
Fixed	3.48%	3.45%
Variable	5.06%	5.62%
Estimated fair value gain (loss)	$ (8,000)	$ (1,000)
Fixed Rate Available For Sale Securities | Fair value hedges:
Derivative [Line Items]
Notional Amount	$ 15,000
Average Maturity (in years)	3 months 18 days
Fixed	4.84%
Variable	4.86%
Estimated fair value gain (loss)	$ 0

Derivative Financial Instrume_5

Derivative Financial Instruments - Information about Fair Values of Derivative Instruments in Consolidated Balance Sheet (Detail) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Derivatives, Fair Value [Line Items]
Asset derivatives, fair value	$ 286	$ 324
Liability derivatives, fair value	679	943
Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset derivatives, fair value	1	18
Liability derivatives, fair value	55	10
Fair value hedges:
Derivatives, Fair Value [Line Items]
Asset derivatives, fair value	232	256
Liability derivatives, fair value	584	898
Fair value hedges: | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset derivatives, fair value	53	50
Liability derivatives, fair value	40	35
Interest rate swap agreements | Fair value hedges: | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset derivatives, fair value	0	12
Liability derivatives, fair value	38	2
Commitments to sell real estate loans | Fair value hedges: | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset derivatives, fair value	1	6
Liability derivatives, fair value	17	8
Commitments to sell real estate loans | Fair value hedges: | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset derivatives, fair value	24	35
Liability derivatives, fair value	19	3
Mortgage-related commitments to originate real estate loans for sale | Fair value hedges: | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset derivatives, fair value	29	15
Liability derivatives, fair value	21	32
Interest Rate Contracts | Fair value hedges: | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset derivatives, fair value	218	237
Liability derivatives, fair value	571	879
Foreign exchange and other option and futures contracts | Fair value hedges: | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset derivatives, fair value	14	19
Liability derivatives, fair value	$ 13	$ 19

Derivative Financial Instrume_6

Derivative Financial Instruments - Information about Fair Values of Derivative Instruments in Consolidated Statement of Income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives not designated as hedging instruments, derivatives	$ 10,000	$ 10,000	$ 24,000	$ 36,000
Interest rate swap agreements | Designated as Hedging Instrument | Fair value hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives in fair value hedging relationships, derivative	130,000	(61,000)	52,000	(95,000)
Derivatives in fair value hedging relationships, hedged item	$ (130,000)	$ 61,000	$ (52,000)	$ 96,000
Interest rate swap agreements | Fixed Rate Long-Term Borrowings | Designated as Hedging Instrument | Fair value hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other costs of operations	Other costs of operations	Other costs of operations	Other costs of operations
Derivatives in fair value hedging relationships, derivative	$ 130,000	$ (61,000)	$ 52,000	$ (95,000)
Derivatives in fair value hedging relationships, hedged item	(130,000)	61,000	(52,000)	96,000
Interest rate swap agreements | Fixed Rate Available For Sale Securities | Designated as Hedging Instrument | Fair value hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives in fair value hedging relationships, derivative	0		0
Derivatives in fair value hedging relationships, hedged item	0		0
Interest Rate Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives not designated as hedging instruments, derivatives	5,000	6,000	11,000	25,000
Foreign exchange and other option and futures contracts
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives not designated as hedging instruments, derivatives	$ 5,000	$ 4,000	$ 13,000	$ 11,000

Derivative Financial Instrume_7

Derivative Financial Instruments - Information about Hedged Items Included in Consolidated Balance Sheet (Detail) - Designated as Hedging Instrument - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Carrying Amount | Long-term Debt
Derivatives, Fair Value [Line Items]
Hedged Item	$ 3,853	$ 2,954
Carrying Amount | Debt Securities, Available For Sale
Derivatives, Fair Value [Line Items]
Hedged Item	391
Estimated Fair Value | Long-term Debt
Derivatives, Fair Value [Line Items]
Hedged Item	$ 8	$ (44)

Variable Interest Entities an_3

Variable Interest Entities and Asset Securitizations - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Aug. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Loss on securitization of assets			$ 0
Long-term borrowings	$ 11,583,000,000		11,583,000,000				$ 8,201,000,000
Loans	133,716,000,000		133,716,000,000				131,939,000,000
Other assets for its "investment" in the common securities recognized by the company of various trusts	22,000,000		22,000,000				22,000,000
Total assets of partnerships in which the company invested	211,785,000,000		211,785,000,000				208,264,000,000
Secured Debt
Long-term debt term (in years)						2 years
Loans and leases average rate						5.29%
Secured Debt | Automobile
Financing receivable, accrued interest, before allowance for credit loss	418,000,000		418,000,000			$ 526,000,000
Long-term debt term (in years)						2 years
Loans and leases average rate						5.29%
Secured Debt | Equipment Finance Loans And Leases
Financing receivable, accrued interest, before allowance for credit loss	742,000,000		742,000,000		$ 790,000,000
Long-term debt term (in years)					2 years
Loans and leases average rate					4.87%
Secured Debt | Third Party Investors | Automobile
Financing receivable, accrued interest, before allowance for credit loss						$ 511,000,000
Long-term borrowings	406,000,000		406,000,000
Secured Debt | Third Party Investors | Equipment Finance Loans And Leases
Financing receivable, accrued interest, before allowance for credit loss					$ 650,000,000
Long-term borrowings	614,000,000		614,000,000
Secured Debt | M&T Bank | Automobile
Financing receivable, accrued interest, before allowance for credit loss						$ 15,000,000
Secured Debt | M&T Bank | Equipment Finance Loans And Leases
Financing receivable, accrued interest, before allowance for credit loss					$ 140,000,000
Variable Interest Entity Primary Beneficiary
Total assets of partnerships in which the company invested	10,000,000,000		10,000,000,000				$ 9,800,000,000
Federal tax credits and other federal tax benefits recognized	10,000,000	$ 6,000,000	25,000,000	$ 22,000,000
Investments amortized to income tax expense	47,000,000	46,000,000	135,000,000	128,000,000
Maximum exposure to loss of investments in real estate partnerships	2,100,000,000		2,100,000,000
Variable Interest Entity Primary Beneficiary | Renewable Energy
Federal tax credits and other federal tax benefits recognized	8,000,000	10,000,000	8,000,000	10,000,000
Investments amortized to income tax expense	$ 28,000,000	$ 22,000,000	$ 28,000,000	$ 22,000,000

Variable Interest Entities an_4

Variable Interest Entities and Asset Securitizations - Summary of Carrying Amount (Details) - Variable Interest Entity Primary Beneficiary - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Affordable Housing Projects
Variable Interest Entity [Line Items]
Investment in partnership carrying amount	$ 1,365	$ 1,340
Unfunded commitments includes carrying amount of its investments	431	410
Contingent commitments to provide additional capital contributions to partnerships	65	55
Renewable Energy
Variable Interest Entity [Line Items]
Investment in partnership carrying amount	71	80
Unfunded commitments includes carrying amount of its investments	0	31
Other Projects
Variable Interest Entity [Line Items]
Investment in partnership carrying amount	38	41
Unfunded commitments includes carrying amount of its investments	$ 0	$ 0

Fair Value Measurements - Asset

Fair Value Measurements - Assets and Liabilities Measured at Estimated Fair Value on Recurring Basis (Detail) - Recurring - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Fair Value Measurements
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Trading account	$ 102,000	$ 106,000
Investment securities available for sale:	16,727,000	10,440,000
Equity securities	257,000	268,000
Real estate loans held for sale	958,000	379,000
Other assets	286,000	324,000
Total assets	18,330,000	11,517,000
Other liabilities	679,000	943,000
Total liabilities	679,000	943,000
Fair Value Measurements | U.S. Treasury and federal agencies
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities available for sale:	7,860,000	7,705,000
Fair Value Measurements | Commercial
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities available for sale:	3,177,000	416,000
Fair Value Measurements | Residential
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities available for sale:	5,589,000	2,154,000
Fair Value Measurements | Other debt securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities available for sale:	101,000	165,000
Level 1
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Trading account	102,000	101,000
Investment securities available for sale:	0	0
Equity securities	244,000	258,000
Real estate loans held for sale	0	0
Other assets	0	0
Total assets	346,000	359,000
Other liabilities	0	0
Total liabilities	0	0
Level 1 | U.S. Treasury and federal agencies
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities available for sale:	0	0
Level 1 | Commercial
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities available for sale:	0	0
Level 1 | Residential
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities available for sale:	0	0
Level 1 | Other debt securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities available for sale:	0	0
Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Trading account	0	5,000
Investment securities available for sale:	16,727,000	10,440,000
Equity securities	13,000	10,000
Real estate loans held for sale	958,000	379,000
Other assets	257,000	309,000
Total assets	17,955,000	11,143,000
Other liabilities	658,000	911,000
Total liabilities	658,000	911,000
Level 2 | U.S. Treasury and federal agencies
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities available for sale:	7,860,000	7,705,000
Level 2 | Commercial
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities available for sale:	3,177,000	416,000
Level 2 | Residential
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities available for sale:	5,589,000	2,154,000
Level 2 | Other debt securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities available for sale:	101,000	165,000
Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Trading account	0	0
Investment securities available for sale:	0	0
Equity securities	0	0
Real estate loans held for sale	0	0
Other assets	29,000	15,000
Total assets	29,000	15,000
Other liabilities	21,000	32,000
Total liabilities	21,000	32,000
Level 3 | U.S. Treasury and federal agencies
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities available for sale:	0	0
Level 3 | Commercial
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities available for sale:	0	0
Level 3 | Residential
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities available for sale:	0	0
Level 3 | Other debt securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities available for sale:	$ 0	$ 0

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Detail)	3 Months Ended			9 Months Ended
	Sep. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Weighted-average discount rates for fair value estimations				37%
Historical recovery rate of collateral values of consumer installment loans				43%
Minimum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Discount rates for fair value estimations				10%
Maximum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Discount rates for fair value estimations				90%
Level 3
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	$ 81,000,000		$ 116,000,000	$ 204,000,000	$ 269,000,000
Level 3 | Measurement Input, Commitment Expiration
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Held-for-sale measurement input (as a percent)	0.06			0.06		0.05
Level 3 | Residential Mortgage Loans
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Capitalized servicing rights, valuation allowance		$ 0		$ 0	0
Nonrecurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Loans measured at fair value on nonrecurring basis	$ 805,000,000		804,000,000	805,000,000	804,000,000	$ 923,000,000
Nonrecurring | Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Loans measured at fair value on nonrecurring basis	159,000,000		316,000,000	159,000,000	316,000,000	234,000,000
Nonrecurring | Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Loans measured at fair value on nonrecurring basis	$ 646,000,000		$ 488,000,000	$ 646,000,000	$ 488,000,000	$ 689,000,000

Fair Value Measurements - Carry

Fair Value Measurements - Carrying Amounts and Estimated Fair Value for Financial Instrument Assets (Liabilities) (Detail) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Cash and cash equivalents
Interest-bearing deposits at banks	$ 24,417	$ 28,069
Investment securities held to maturity	32,327	26,897
Loans and leases, net	133,716	131,939
Financial liabilities:
Short-term borrowings	105	316
Loan facility carrying amount	11,583	8,201
Level 1
Cash and cash equivalents
Cash and cash equivalents	2,107	1,668
Interest-bearing deposits at banks	0	0
Investment securities held to maturity	0	0
Loans and leases, net	0	0
Financial liabilities:
Time deposits	0	0
Short-term borrowings	0	0
Loan facility carrying amount	0	0
Level 2
Cash and cash equivalents
Cash and cash equivalents	109	63
Interest-bearing deposits at banks	24,417	28,069
Investment securities held to maturity	13,666	14,262
Loans and leases, net	7,581	7,240
Financial liabilities:
Time deposits	16,514	20,715
Short-term borrowings	2,605	5,316
Loan facility carrying amount	11,705	8,107
Level 3
Cash and cash equivalents
Cash and cash equivalents	0	0
Interest-bearing deposits at banks	0	0
Investment securities held to maturity	43	46
Loans and leases, net	124,505	121,898
Financial liabilities:
Time deposits	0	0
Short-term borrowings	0	0
Loan facility carrying amount	0	0
Carrying Amount
Cash and cash equivalents
Cash and cash equivalents	2,216	1,731
Interest-bearing deposits at banks	24,417	28,069
Investment securities held to maturity	14,503	15,330
Loans and leases, net	133,716	131,939
Financial liabilities:
Time deposits	16,512	20,759
Short-term borrowings	2,605	5,316
Loan facility carrying amount	11,583	8,201
Estimated Fair Value
Cash and cash equivalents
Cash and cash equivalents	2,216	1,731
Interest-bearing deposits at banks	24,417	28,069
Investment securities held to maturity	13,709	14,308
Loans and leases, net	132,086	129,138
Financial liabilities:
Time deposits	16,514	20,715
Short-term borrowings	2,605	5,316
Loan facility carrying amount	$ 11,705	$ 8,107

Commitments and Contingencies -

Commitments and Contingencies - Commitments and Contingent Liabilities Outstanding (Detail) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Commitments to extend credit
Commercial and industrial	$ 30,210	$ 28,566
Commercial real estate loans to be sold	825	916
Other commercial real estate	3,153	5,019
Residential real estate loans to be sold	258	163
Other residential real estate	744	331
Home equity lines of credit	7,950	8,109
Credit cards	5,889	5,578
Other	271	413
Standby letters of credit	2,267	2,289
Commercial letters of credit	70	62
Financial guarantees and indemnification contracts	4,090	4,036
Commitments to sell real estate loans	$ 1,940	$ 1,400

Commitments and Contingencies_2

Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Mar. 31, 2024	Sep. 30, 2024	Dec. 31, 2023
Loss Contingencies [Line Items]
Commitments to extend credit to commercial customers		$ 12,700	$ 12,300
Maximum credit risk for recourse associated with loans sold under Federal National Mortgage Association Delegated Underwriting and Servicing program		3,900	$ 3,900
Estimate assessed losses	$ 197	34
Minimum
Loss Contingencies [Line Items]
Range of reasonably possible losses		0
Maximum
Loss Contingencies [Line Items]
Range of reasonably possible losses		$ 25

Segment Information - Informati

Segment Information - Information about Company's Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting Information [Line Items]
Net Income (Loss)	$ 721,000	$ 690,000	$ 1,907,000	$ 2,259,000
Total Average Assets	209,581,000	205,791,000	211,008,000	204,266,000
Operating Segments
Segment Reporting Information [Line Items]
Total Revenues	2,332,000	2,335,000	6,894,000	7,343,000
Inter- segment Revenues
Segment Reporting Information [Line Items]
Total Revenues	0	0	0	0
Commercial Bank
Segment Reporting Information [Line Items]
Net Income (Loss)	239,000	251,000	645,000	819,000
Total Average Assets	80,434,000	80,473,000	80,903,000	80,169,000
Commercial Bank | Operating Segments
Segment Reporting Information [Line Items]
Total Revenues	723,000	738,000	2,139,000	2,308,000
Commercial Bank | Inter- segment Revenues
Segment Reporting Information [Line Items]
Total Revenues	0	1,000	4,000	4,000
Retail Bank
Segment Reporting Information [Line Items]
Net Income (Loss)	446,000	473,000	1,364,000	1,400,000
Total Average Assets	53,128,000	51,024,000	52,771,000	51,124,000
Retail Bank | Operating Segments
Segment Reporting Information [Line Items]
Total Revenues	1,292,000	1,307,000	3,854,000	3,837,000
Retail Bank | Inter- segment Revenues
Segment Reporting Information [Line Items]
Total Revenues	0	0	0	0
Institutional Services and Wealth Management
Segment Reporting Information [Line Items]
Net Income (Loss)	137,000	120,000	409,000	515,000
Total Average Assets	3,898,000	3,664,000	3,735,000	3,680,000
Institutional Services and Wealth Management | Operating Segments
Segment Reporting Information [Line Items]
Total Revenues	389,000	363,000	1,167,000	1,344,000
Institutional Services and Wealth Management | Inter- segment Revenues
Segment Reporting Information [Line Items]
Total Revenues	4,000	3,000	10,000	9,000
All Other
Segment Reporting Information [Line Items]
Net Income (Loss)	(101,000)	(154,000)	(511,000)	(475,000)
Total Average Assets	72,121,000	70,630,000	73,599,000	69,293,000
All Other | Operating Segments
Segment Reporting Information [Line Items]
Total Revenues	(72,000)	(73,000)	(266,000)	(146,000)
All Other | Inter- segment Revenues
Segment Reporting Information [Line Items]
Total Revenues	$ (4,000)	$ (4,000)	$ (14,000)	$ (13,000)

Segment Information - Additiona

Segment Information - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting [Abstract]
Taxable-equivalent adjustment	$ 13,000,000	$ 15,000,000	$ 38,000,000	$ 41,000,000

Relationship with Bayview Len_2

Relationship with Bayview Lending Group LLC and Bayview Financial Holdings, L.P. - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]
Revenue from contract with customer	$ 394,000,000	$ 360,000,000	$ 1,149,000,000	$ 1,119,000,000
Loan facility carrying amount	$ 11,583,000,000		$ 11,583,000,000		$ 8,201,000,000
Bayview Lending Group
Schedule of Equity Method Investments [Line Items]
Ownership percentage (as a percent)	20%		20%
Equity method investments	$ 0		$ 0
Bayview Lending Group | Other Revenues From Operations
Schedule of Equity Method Investments [Line Items]
Income from equity method investments			25,000,000	20,000,000
Bayview Lending Group and Bayview Financial
Schedule of Equity Method Investments [Line Items]
Outstanding principal balances of mortgage servicing rights	1,100,000,000		1,100,000,000		1,200,000,000
Revenue from contract with customer	1,000,000	1,000,000	4,000,000	5,000,000
Bayview Financial
Schedule of Equity Method Investments [Line Items]
Outstanding principal balances of residential mortgage loans from Bayview Financial	112,700,000,000		112,700,000,000		115,300,000,000
Revenues from sub-servicing	29,000,000	$ 30,000,000	92,000,000	$ 94,000,000
Investment securities in held-to-maturity portfolio securitized by Bayview Financial	38,000,000		38,000,000		$ 42,000,000
Bayview Financial | Syndicated Loan Facility
Schedule of Equity Method Investments [Line Items]
Loan facility carrying amount	3,000,000,000		3,000,000,000
Bayview Financial | Syndicated Loan Facility | M&T Bank
Schedule of Equity Method Investments [Line Items]
Loan facility carrying amount	$ 510,000,000		$ 510,000,000