KeyCorp (KEY) 10-Q 6 Nov 24 2024 Q3 Quarterly report Financial data

Cover Page

Cover Page - shares	9 Months Ended
	Sep. 30, 2024	Nov. 04, 2024
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2024
Document Transition Report	false
Entity File Number	001-11302
Entity Registrant Name	KeyCorp
Entity Incorporation, State or Country Code	OH
Entity Tax Identification Number	34-6542451
Entity Address, Address Line One	127 Public Square,
Entity Address, City or Town	Cleveland,
Entity Address, State or Province	OH
Entity Address, Postal Zip Code	44114-1306
City Area Code	216
Local Phone Number	689-3000
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		991,282,986
Entity Central Index Key	0000091576
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q3
Amendment Flag	false
Common Shares
Entity Information [Line Items]
Title of 12(b) Security	Common Shares, $1 par value
Trading Symbol	KEY
Security Exchange Name	NYSE
Series E Preferred Stock
Entity Information [Line Items]
Title of 12(b) Security	Perpetual Non-Cumulative Preferred Stock, Series E)
Trading Symbol	KEY PrI
Security Exchange Name	NYSE
Series F Preferred Stock
Entity Information [Line Items]
Title of 12(b) Security	Cumulative Preferred Stock, Series F)
Trading Symbol	KEY PrJ
Security Exchange Name	NYSE
Series G Preferred Stock
Entity Information [Line Items]
Title of 12(b) Security	Cumulative Preferred Stock, Series G)
Trading Symbol	KEY PrK
Security Exchange Name	NYSE
Series H Preferred Stock
Entity Information [Line Items]
Title of 12(b) Security	Cumulative Preferred Stock, Series H)
Trading Symbol	KEY PrL
Security Exchange Name	NYSE

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions		Sep. 30, 2024	Dec. 31, 2023
ASSETS
Cash and due from banks		$ 1,276	$ 941
Short-term investments		22,796	10,817
Trading account assets		1,404	1,142
Securities available for sale		34,169	37,185
Held-to-maturity securities (fair value: $7,317 and $8,056)		7,702	8,575
Other investments		1,117	1,244
Loans, net of unearned income of $317 and $356		105,346	112,606
Less: Allowance for loan and lease losses		(1,494)	(1,508)
Net loans		103,852	111,098
Loans held for sale	[1]	1,058	483
Premises and equipment		624	661
Goodwill		2,752	2,752
Other intangible assets		34	55
Corporate-owned life insurance		4,379	4,383
Accrued income and other assets		8,323	8,601
Discontinued assets		277	344
Total assets		189,763	188,281
Deposits in domestic offices:
Interest-bearing deposits		119,995	114,859
Noninterest-bearing deposits		30,358	30,728
Total deposits		150,353	145,587
Federal funds purchased and securities sold under repurchase agreements		44	38
Bank notes and other short-term borrowings		2,359	3,053
Accrued expense and other liabilities		4,478	5,412
Long-term debt		15,677	19,554
Total liabilities		172,911	173,644
EQUITY
Preferred stock		2,500	2,500
Common Shares, $1 par value; authorized 2,100,000,000 shares; issued 1,256,702,081 shares		1,257	1,257
Capital surplus		6,149	6,281
Retained earnings		15,066	15,672
Treasury stock, at cost (265,451,109 and 320,138,094 shares)		(4,839)	(5,844)
Accumulated other comprehensive income (loss)		(3,281)	(5,229)
Total equity		16,852	14,637
Total liabilities and equity		$ 189,763	$ 188,281
[1] Total loans held for sale include real estate — residential mortgage loans held for sale at fair value of $61 million at September 30, 2024, and $51 million at December 31, 2023.

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Held-to-maturity securities fair value	$ 7,317	$ 8,056
Financing receivable, unearned income	$ 317	$ 356
Common shares, par value (in usd per share)	$ 1	$ 1
Common shares, shares authorized (in shares)	2,100,000,000	2,100,000,000
Common shares, shares issued (in shares)	1,256,702,081	1,256,702,081
Treasury stock, shares (in shares)	265,451,109	320,138,094
Residential Mortgage
Loans held for sale	$ 61	$ 51

Consolidated Statements of Inco

Consolidated Statements of Income - 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		$ 1,516	$ 1,593	$ 4,578	$ 4,645
Loans held for sale		18	19	40	49
Securities available for sale		298	192	789	580
Held-to-maturity securities		70	79	218	234
Trading account assets		15	15	45	42
Short-term investments		244	123	578	276
Other investments		14	22	47	51
Total interest income		2,175	2,043	6,295	5,877
INTEREST EXPENSE
Deposits		887	687	2,486	1,568
Federal funds purchased and securities sold under repurchase agreements		1	9	3	79
Bank notes and other short-term borrowings		43	81	140	263
Long-term debt		292	351	952	975
Total interest expense		1,223	1,128	3,581	2,885
NET INTEREST INCOME		952	915	2,714	2,992
Provision for credit losses		95	81	296	387
Net interest income after provision for credit losses		857	834	2,418	2,605
NONINTEREST INCOME
Trust and investment services income		140	130	415	384
Investment banking and debt placement fees		171	141	467	406
Cards and payments income		84	90	246	256
Service charges on deposit accounts		67	69	196	205
Corporate services income		69	73	206	235
Commercial mortgage servicing fees		73	46	190	142
Corporate-owned life insurance income		36	35	102	96
Consumer mortgage income		12	15	42	40
Operating lease income and other leasing gains		16	22	61	70
Other income		(2)	22	28	33
Net securities gains (losses)		(935)	0	(948)	(7)
Total noninterest income		(269)	643	1,005	1,860
NONINTEREST EXPENSE
Personnel		670	663	1,980	1,986
Net occupancy		66	67	199	202
Computer processing		104	89	307	276
Business services and professional fees		41	38	119	124
Equipment		20	20	60	64
Operating lease expense		14	18	48	59
Marketing		21	28	61	78
Other expense		158	187	542	573
Total noninterest expense		1,094	1,110	3,316	3,362
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES		(506)	367	107	1,103
Income taxes		(95)	65	26	204
Income (loss) from continuing operations		(411)	302	81	899
Income (loss) from discontinued operations		1	1	2	3
NET INCOME (LOSS)		(410)	303	83	902
Income (loss) from continuing operations attributable to Key common shareholders		(447)	266	(27)	791
Net income (loss) attributable to Key common shareholders		$ (446)	$ 267	$ (25)	$ 794
Per Common Share:
Income (loss) from continuing operations attributable to Key common shareholders (in usd per share)		$ (0.47)	$ 0.29	$ (0.03)	$ 0.85
Income (loss) from discontinued operations, net of taxes (in usd per share)		0	0	0	0
Net income (loss) attributable to Key common shareholders (in usd per share)	[1]	(0.47)	0.29	(0.03)	0.86
Per Common Share — assuming dilution:
Income (loss) from continuing operations attributable to Key common shareholders (in usd per share)		(0.47)	0.29	(0.03)	0.85
Income (loss) from discontinued operations, net of taxes (in usd per share)		0	0	0	0
Net income (loss) attributable to Key common shareholders (in usd per share)	[1]	$ (0.47)	$ 0.29	$ (0.03)	$ 0.85
Weighted-average Common Shares outstanding (in shares)		948,979	927,131	936,962	927,019
Effect of Common Share options and other stock awards (in shares)	[2]	0	4,613	0	5,213
Weighted-average Common Shares and potential Common Shares outstanding (in shares)	[3]	948,979	931,744	936,962	932,232
[1] EPS may not foot due to rounding. For periods ended in a loss from continuing operations attributable to Key common shareholders, anti-dilutive instruments have been excluded from the calculation of diluted earnings per share. Assumes conversion of Common Share options and other stock awards and/or convertible preferred stock, as applicable.

Consolidated Statements of In_2

Consolidated Statements of Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Income Statement [Abstract]
Loss (gain) in net securities	$ 935	$ 0	$ 948	$ 7

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - 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 (loss)	$ (410)	$ 303	$ 83	$ 902
Other comprehensive income (loss), net of tax:
Net unrealized gains (losses) on securities available for sale, net of income taxes of $(524), $210, $(495), and $160	1,663	(668)	1,571	(509)
Net unrealized gains (losses) on derivative financial instruments, net of income taxes of $(62), $(22), $(117), and $(50)	199	72	373	161
Net pension and postretirement benefit costs, net of income taxes of $0, $0, $(1), and $(1)	1	1	4	4
Total other comprehensive income (loss), net of tax	1,863	(595)	1,948	(344)
Comprehensive income (loss) attributable to Key	$ 1,453	$ (292)	$ 2,031	$ 558

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income (Parenthetical) - 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 unrealized gains (losses) on securities available for sale, tax	$ (524)	$ 210	$ (495)	$ 160
Net unrealized gains (losses) on derivative financial instruments, tax	(62)	(22)	(117)	(50)
Net pension and postretirement benefit costs, tax	$ 0	$ 0	$ (1)	$ (1)

Consolidated Statements of Chan

Consolidated Statements of Changes in Equity - USD ($) $ in Millions	Total	Series D Preferred Stock	Series E Preferred Stock	Series F Preferred Stock	Series G Preferred Stock	Series H Preferred Stock	Preferred Stock	Common Shares	Capital Surplus	Retained Earnings	Retained Earnings Series D Preferred Stock	Retained Earnings Series E Preferred Stock	Retained Earnings Series F Preferred Stock	Retained Earnings Series G Preferred Stock	Retained Earnings Series H Preferred Stock	Treasury Stock, at Cost	Accumulated Other Comprehensive Income (Loss)
Beginning balance, Preferred Shares (in shares) at Dec. 31, 2022							1,996,000
Beginning balance, Common Shares (in shares) at Dec. 31, 2022								933,325,000
Beginning balance at Dec. 31, 2022	$ 13,454						$ 2,500	$ 1,257	$ 6,286	$ 15,616						$ (5,910)	$ (6,295)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	902									902
Other comprehensive income (loss)	(344)																(344)
Deferred compensation	(6)								(6)
Cash dividends declared
Cash dividends declared on common shares	(575)									(575)
Cash dividends declared on preferred stock		$ (20)	$ (23)	$ (18)	$ (19)	$ (28)					$ (20)	$ (23)	$ (18)	$ (19)	$ (28)
Open market Common Share repurchases (in shares)								(2,550,000)
Open market Common Share repurchases	(38)															(38)
Employee equity compensation program Common Share repurchases (in shares)								(1,831,000)
Employee equity compensation program Common Share repurchases	(34)															(34)
Common Shares reissued (returned) for stock options and other employee benefit plans (in shares)								7,217,000
Common Shares reissued (returned) for stock options and other employee benefit plans	105								(26)							131
Ending balance, Preferred Shares (in shares) at Sep. 30, 2023							1,996,000
Ending balance, Common Shares (in shares) at Sep. 30, 2023								936,161,000
Ending balance at Sep. 30, 2023	13,356						$ 2,500	$ 1,257	6,254	15,835						(5,851)	(6,639)
Beginning balance, Preferred Shares (in shares) at Jun. 30, 2023							1,996,000
Beginning balance, Common Shares (in shares) at Jun. 30, 2023								935,733,000
Beginning balance at Jun. 30, 2023	13,844						$ 2,500	$ 1,257	6,231	15,759						(5,859)	(6,044)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	303									303
Other comprehensive income (loss)	(595)																(595)
Deferred compensation	(1)								(1)
Cash dividends declared
Cash dividends declared on common shares	(191)									(191)
Cash dividends declared on preferred stock		(7)	(8)	(6)	(6)	(9)					(7)	(8)	(6)	(6)	(9)
Employee equity compensation program Common Share repurchases (in shares)								(10,000)
Common Shares reissued (returned) for stock options and other employee benefit plans (in shares)								438,000
Common Shares reissued (returned) for stock options and other employee benefit plans	32								24							8
Ending balance, Preferred Shares (in shares) at Sep. 30, 2023							1,996,000
Ending balance, Common Shares (in shares) at Sep. 30, 2023								936,161,000
Ending balance at Sep. 30, 2023	13,356						$ 2,500	$ 1,257	6,254	15,835						(5,851)	(6,639)
Beginning balance, Preferred Shares (in shares) at Dec. 31, 2023							1,996,000
Beginning balance, Common Shares (in shares) at Dec. 31, 2023								936,564,000
Beginning balance at Dec. 31, 2023	14,637						$ 2,500	$ 1,257	6,281	15,672						(5,844)	(5,229)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	83									83
Other comprehensive income (loss)	1,948																1,948
Deferred compensation	(4)								(4)
Cash dividends declared
Cash dividends declared on common shares	(581)									(581)
Cash dividends declared on preferred stock		$ (20)	$ (23)	$ (18)	$ (19)	$ (28)					(20)	(23)	(18)	(19)	(28)
Employee equity compensation program Common Share repurchases (in shares)								(1,887,000)
Employee equity compensation program Common Share repurchases	(27)															(27)
Common Shares reissued (returned) for stock options and other employee benefit plans (in shares)								8,745,000
Common Shares reissued (returned) for stock options and other employee benefit plans	93								(67)							160
Common Shares reissued under Scotiabank investment agreement, net of issuance costs (in shares)								47,829,000
Common Shares reissued under Scotiabank investment agreement, net of issuance costs	811								(61)							872
Ending balance, Preferred Shares (in shares) at Sep. 30, 2024		21,000	500,000	425,000	450,000	600,000	1,996,000
Ending balance, Common Shares (in shares) at Sep. 30, 2024								991,251,000
Ending balance at Sep. 30, 2024	16,852						$ 2,500	$ 1,257	6,149	15,066						(4,839)	(3,281)
Beginning balance, Preferred Shares (in shares) at Jun. 30, 2024							1,996,000
Beginning balance, Common Shares (in shares) at Jun. 30, 2024								943,200,000
Beginning balance at Jun. 30, 2024	14,789						$ 2,500	$ 1,257	6,185	15,706						(5,715)	(5,144)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(410)									(410)
Other comprehensive income (loss)	1,863																1,863
Cash dividends declared
Cash dividends declared on common shares	(194)									(194)
Cash dividends declared on preferred stock		$ (7)	$ (8)	$ (6)	$ (6)	$ (9)					$ (7)	$ (8)	$ (6)	$ (6)	$ (9)
Employee equity compensation program Common Share repurchases (in shares)								(8,000)
Employee equity compensation program Common Share repurchases	(1)															(1)
Common Shares reissued (returned) for stock options and other employee benefit plans (in shares)								230,000
Common Shares reissued (returned) for stock options and other employee benefit plans	30								25							5
Common Shares reissued under Scotiabank investment agreement, net of issuance costs (in shares)								47,829,000
Common Shares reissued under Scotiabank investment agreement, net of issuance costs	811								(61)							872
Ending balance, Preferred Shares (in shares) at Sep. 30, 2024		21,000	500,000	425,000	450,000	600,000	1,996,000
Ending balance, Common Shares (in shares) at Sep. 30, 2024								991,251,000
Ending balance at Sep. 30, 2024	$ 16,852						$ 2,500	$ 1,257	$ 6,149	$ 15,066						$ (4,839)	$ (3,281)

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Equity (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Cash dividends declared on Common Shares (in usd per share)	$ 0.205	$ 0.205	$ 0.615	$ 0.615
Series D Preferred Stock
Cash dividends declared on Preferred Stock (in usd per share)	12.50	12.50	37.50	37.50
Series E Preferred Stock
Cash dividends declared on Preferred Stock (in usd per share)	0.382813	0.382813	1.148439	1.148439
Series F Preferred Stock
Cash dividends declared on Preferred Stock (in usd per share)	0.353125	0.353125	1.059375	1.059375
Series G Preferred Stock
Cash dividends declared on Preferred Stock (in usd per share)	0.351563	0.351563	1.054689	1.054689
Series H Preferred Stock
Cash dividends declared on Preferred Stock (in usd per share)	$ 0.387500	$ 0.387500	$ 1.162500	$ 1.162500

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
OPERATING ACTIVITIES
Net income (loss)	$ 83	$ 902
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Provision for credit losses	296	387
Depreciation, amortization, and accretion, net	68	121
Increase in cash surrender value of corporate-owned life insurance	(86)	(80)
Stock-based compensation expense	76	90
Deferred income taxes (benefit)	(138)	(36)
Proceeds from sales of loans held for sale	5,099	6,728
Originations of loans held for sale, net of repayments	(5,711)	(6,556)
Net losses (gains) on sales of loans held for sale	(84)	(99)
Net losses (gains) on leased equipment	(8)	(6)
Net securities and other investments losses (gains)	948	7
Net losses (gains) on sales of fixed assets	(4)	11
Net change in:
Trading account assets	(262)	(496)
Accrued income and other assets	224	325
Accrued expense and other liabilities	(780)	361
Other operating activities, net	(784)	207
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	(1,063)	1,866
INVESTING ACTIVITIES
Net decrease (increase) in short-term investments, excluding acquisitions	(11,979)	(5,439)
Purchases of securities available for sale	(12,562)	(1,178)
Proceeds from sales of securities available for sale	15,898	1,400
Proceeds from prepayments and maturities of securities available for sale	1,758	2,351
Proceeds from prepayments and maturities of held-to-maturity securities	881	1,046
Purchases of held-to-maturity securities	0	(1,179)
Net decrease (increase) in other investments	130	(55)
Net decrease (increase) in loans, excluding acquisitions, sales and transfers	6,962	3,788
Proceeds from sales of portfolio loans	156	117
Proceeds from corporate-owned life insurance	90	68
Purchases of premises, equipment, and software	(42)	(99)
Proceeds from sales of premises and equipment	12	5
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES	1,304	825
FINANCING ACTIVITIES
Net increase (decrease) in deposits	4,766	1,696
Net increase (decrease) in short-term borrowings	(688)	(5,950)
Net proceeds from issuance of long-term debt	1,565	5,240
Payments on long-term debt	(5,649)	(2,952)
Repurchases of long-term debt	0	(92)
Open market Common Share repurchases	0	(38)
Employee equity compensation program Common Share repurchases	(27)	(34)
Net proceeds from reissuance of Common Shares	5	1
Net proceeds from Scotiabank investment	811	0
Cash dividends paid	(689)	(683)
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	94	(2,812)
NET INCREASE (DECREASE) IN CASH AND DUE FROM BANKS	335	(121)
CASH AND DUE FROM BANKS AT BEGINNING OF PERIOD	941	887
CASH AND DUE FROM BANKS AT END OF PERIOD	1,276	766
Additional disclosures relative to cash flows:
Interest paid	3,112	2,137
Income taxes paid (refunded)	69	155
Noncash items:
Reduction of secured borrowing and related collateral	3	5
Loans transferred to portfolio from held for sale	123	177
Loans transferred to held for sale from portfolio	3	19
Loans transferred to OREO	4	7
ABS risk retentions	$ 6	$ 7

Basis of Presentation and Accou

Basis of Presentation and Accounting Policies	9 Months Ended
	Sep. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation and Accounting Policies	1. Basis of Presentation and Accounting Policies The consolidated financial statements include the accounts of KeyCorp and its subsidiaries. All significant intercompany accounts and transactions have been eliminated in consolidation. Some previously reported amounts have been reclassified in the statements of cash flows from “other operating activities, net” to either the net change in “accrued income and other assets” or “accrued expense and other liabilities” to align with updated presentation. Some previously reported amounts have been reclassified in the statements of income from “other income” to “net securities gains (losses).” The consolidated financial statements include any voting rights entities in which we have a controlling financial interest. In accordance with the applicable accounting guidance for consolidations, we consolidate a VIE if we have: (i) a variable interest in the entity; (ii) the power to direct activities of the VIE that most significantly affect the entity’s economic performance; and (iii) the obligation to absorb losses of the entity or the right to receive benefits from the entity that could potentially be significant to the VIE (i.e., we are considered to be the primary beneficiary). Variable interests can include equity interests, subordinated debt, derivative contracts, leases, service agreements, guarantees, standby letters of credit, loan commitments, and other contracts, agreements, and financial instruments. See Note 11 (“Variable Interest Entities”) for information on our involvement with VIEs. We use the equity method to account for unconsolidated investments in voting rights entities or VIEs if we have significant influence over the entity’s operating and financing decisions (usually defined as a voting or economic interest of 20% to 50%, but not controlling). Unconsolidated investments in voting rights entities or VIEs in which we have a voting or economic interest of less than 20% or for which we do not have significant influence are carried at the cost measurement alternative or at fair value. Investments held by our registered broker-dealer and investment company subsidiaries (principal investing entities and Real Estate Capital line of business) are carried at fair value. The unaudited consolidated interim financial statements reflect all adjustments of a normal recurring nature and disclosures that are necessary for a fair presentation of the results for the interim periods presented. The results of operations for the interim period are not necessarily indicative of the results of operations to be expected for the full year. The interim financial statements should be read in conjunction with the audited consolidated financial statements and related notes included in our 2023 Form 10-K. In preparing these financial statements, subsequent events were evaluated through the time the financial statements were issued. Financial statements are considered issued when they are widely distributed to all shareholders and other financial statement users or filed with the SEC. Accounting Guidance Adopted in 2024 Standard Date of Adoption Description Effect on Financial Statements or ASU 2022-03, Fair Value Measurement - January 1, 2024 Early adoption is The amendments clarify that a contractual restriction on the sale of an equity security is not considered part of the unit of account of the equity security and is not considered in measuring fair value. Entities cannot, as a separate unit of account, recognize and measure a contractual sale restriction. The amendments require disclosures for equity securities subject to contractual restrictions including; the fair value of equity securities subject to contractual sale restrictions reflected in the balance sheet, the nature and remaining duration of the restriction(s) and the circumstances that could cause a lapse in the restriction(s). The guidance should be applied prospectively with any adjustments from the adoption of the amendments recognized in earnings and disclosed on the date of adoption. The guidance did not have any impact on Key’s financial condition or results of operations.

Earnings Per Common Share

Earnings Per Common Share	9 Months Ended
	Sep. 30, 2024
Earnings Per Share [Abstract]
Earnings Per Common Share	2. Earnings Per Common Share Basic earnings per share is the amount of earnings (losses), adjusted for dividends declared on our preferred stock, available to each Common Share outstanding during the reporting periods. Diluted earnings per share is the amount of earnings (losses) available to each Common Share outstanding during the reporting periods adjusted to include the effects of potentially dilutive Common Shares. Potentially dilutive Common Shares include stock options and other stock-based awards. Potentially dilutive Common Shares are excluded from the computation of diluted earnings per share in the periods where the effect would be antidilutive. Our basic and diluted earnings per Common Share are calculated as follows: Three months ended September 30, Nine months ended September 30, Dollars in millions, except per share amounts 2024 2023 2024 2023 EARNINGS Income (loss) from continuing operations $ (411) $ 302 $ 81 $ 899 Less: Dividends on Preferred Stock 36 36 108 108 Income (loss) from continuing operations attributable to Key common shareholders (447) 266 (27) 791 Income (loss) from discontinued operations, net of taxes 1 1 2 3 Net income (loss) attributable to Key common shareholders $ (446) $ 267 $ (25) $ 794 WEIGHTED-AVERAGE COMMON SHARES Weighted-average Common Shares outstanding (000) 948,979 927,131 936,962 927,019 Effect of Common Share options and other stock awards (a) — 4,613 — 5,213 Weighted-average Common Shares and potential Common Shares outstanding (000) (b) 948,979 931,744 936,962 932,232 EARNINGS PER COMMON SHARE Income (loss) from continuing operations attributable to Key common shareholders $ (.47) $ .29 $ (.03) $ .85 Income (loss) from discontinued operations, net of taxes — — — — Net income (loss) attributable to Key common shareholders (c) (.47) .29 (.03) .86 Income (loss) from continuing operations attributable to Key common shareholders — assuming dilution $ (.47) $ .29 $ (.03) $ .85 Income (loss) from discontinued operations, net of taxes — assuming dilution — — — — Net income (loss) attributable to Key common shareholders—assuming dilution (c) (.47) .29 (.03) .85 (a) For periods ended in a loss from continuing operations attributable to Key common shareholders, anti-dilutive instruments have been excluded from the calculation of diluted earnings per share. (b) Assumes conversion of Common Share options and other stock awards and/or convertible preferred stock, as applicable. (c) EPS may not foot due to rounding.

Loan Portfolio

Loan Portfolio	9 Months Ended
	Sep. 30, 2024
Loans Receivables [Abstract]
Loan Portfolio	3. Loan Portfolio Loan Portfolio by Portfolio Segment and Financing Receivable (a) Dollars in millions September 30, 2024 December 31, 2023 Commercial and industrial (b) $ 52,774 $ 55,815 Commercial real estate: Commercial mortgage 13,637 15,187 Construction 3,093 3,066 Total commercial real estate loans 16,730 18,253 Commercial lease financing (c) 2,913 3,523 Total commercial loans 72,417 77,591 Residential — prime loans: Real estate — residential mortgage 20,122 20,958 Home equity loans 6,555 7,139 Total residential — prime loans 26,677 28,097 Other consumer loans 5,338 5,916 Credit cards 914 1,002 Total consumer loans 32,929 35,015 Total loans (d) $ 105,346 $ 112,606 (a) Accrued interest of $480 million and $522 million at September 30, 2024, and December 31, 2023, respectively, presented in "Accrued income and other assets" on the Consolidated Balance Sheets is excluded from the amortized cost basis disclosed in this table. (b) Loan balances include $219 million and $207 million of commercial credit card balances at September 30, 2024, and December 31, 2023, respectively. (c) Commercial and industrial includes receivables held as collateral for a secured borrowing of $261 million at September 30, 2024, and no amounts held as collateral for a secured borrowing at December 31, 2023. Commercial lease financing includes receivables held as collateral for a secured borrowing of $3 million and $7 million at September 30, 2024, and December 31, 2023, respectively. Additional information pertaining to this secured borrowing is included in Note 20 (“Long-Term Debt”) beginning on page 169 of our 2023 Form 10-K. (d)

Asset Quality

Asset Quality	9 Months Ended
	Sep. 30, 2024
Credit Loss [Abstract]
Asset Quality	4. Asset Quality ALLL We estimate the appropriate level of the ALLL on at least a quarterly basis. The methodology is described in Note 1 ("Summary of Significant Accounting Policies") under the heading "Allowance for Loan and Lease Losses" beginning on page 109 of our 2023 Form 10-K. The ALLL at September 30, 2024, represents our current estimate of lifetime credit losses inherent in the loan portfolio at that date. The changes in the ALLL by loan category for the periods indicated are as follows: Three months ended September 30, 2024: Dollars in millions June 30, 2024 Provision Charge-offs Recoveries September 30, 2024 Commercial and Industrial $ 682 $ 101 $ (131) $ 7 $ 659 Commercial real estate: Real estate — commercial mortgage 383 (19) (7) 1 358 Real estate — construction 66 (2) — — 64 Total commercial real estate loans 449 (21) (7) 1 422 Commercial lease financing 29 — — — 29 Total commercial loans 1,160 80 (138) 8 1,110 Real estate — residential mortgage 115 (5) — 1 111 Home equity loans 71 1 (1) 1 72 Other consumer loans 128 15 (17) 2 128 Credit cards 73 10 (11) 1 73 Total consumer loans 387 21 (29) 5 384 Total ALLL — continuing operations 1,547 101 (a) (167) 13 1,494 Discontinued operations 14 — (1) — 13 Total ALLL — including discontinued operations $ 1,561 $ 101 $ (168) $ 13 $ 1,507 (a) Excludes a credit for losses on lending-related commitments of $6 million. Three months ended September 30, 2023: Dollars in millions June 30, 2023 Provision Charge-offs Recoveries September 30, 2023 Commercial and Industrial $ 599 $ 29 $ (62) $ 10 $ 576 Commercial real estate: Real estate — commercial mortgage 315 46 (1) — 360 Real estate — construction 39 9 — — 48 Total commercial real estate loans 354 55 (1) — 408 Commercial lease financing 33 (2) — 1 32 Total commercial loans 986 82 (63) 11 1,016 Real estate — residential mortgage 200 (20) — 1 181 Home equity loans 96 (5) (1) 1 91 Other consumer loans 126 11 (14) 2 125 Credit cards 72 11 (9) 1 75 Total consumer loans 494 (3) (24) 5 472 Total ALLL — continuing operations 1,480 79 (a) (87) 16 1,488 Discontinued operations 18 (1) — — 17 Total ALLL — including discontinued operations $ 1,498 $ 78 $ (87) $ 16 $ 1,505 (a) Excludes a provision for losses on lending-related commitments of $2 million. Nine months ended September 30, 2024: Dollars in millions December 31, 2023 Provision Charge-offs Recoveries September 30, 2024 Commercial and Industrial $ 556 $ 336 $ (279) $ 46 $ 659 Commercial real estate: Real estate — commercial mortgage 419 (41) (22) 2 358 Real estate — construction 52 12 — — 64 Total commercial real estate loans 471 (29) (22) 2 422 Commercial lease financing 33 (3) (6) 5 29 Total commercial loans 1,060 304 (307) 53 1,110 Real estate — residential mortgage 162 (53) (2) 4 111 Home equity loans 86 (14) (2) 2 72 Other consumer loans 122 49 (49) 6 128 Credit cards 78 26 (35) 4 73 Total consumer loans 448 8 (88) 16 384 Total ALLL — continuing operations 1,508 312 (a) (395) 69 1,494 Discontinued operations 16 (1) (3) 1 13 Total ALLL — including discontinued operations $ 1,524 $ 311 $ (398) $ 70 $ 1,507 (a) Excludes a credit for losses on lending-related commitments of $16 million. Nine months ended September 30, 2023: Dollars in millions December 31, 2022 Provision Charge-offs Recoveries September 30, 2023 Commercial and Industrial $ 601 $ 81 $ (139) $ 33 $ 576 Commercial real estate: Real estate — commercial mortgage 203 171 (15) 1 360 Real estate — construction 28 20 — — 48 Total commercial real estate loans 231 191 (15) 1 408 Commercial lease financing 32 (4) — 4 32 Total commercial loans 864 268 (154) 38 1,016 Real estate — residential mortgage 196 (17) (1) 3 181 Home equity loans 98 (6) (4) 3 91 Other consumer loans 113 42 (37) 7 125 Credit cards 66 32 (27) 4 75 Total consumer loans 473 51 (69) 17 472 Total ALLL — continuing operations 1,337 319 (a) (223) 55 1,488 Discontinued operations 21 (2) (3) 1 17 Total ALLL — including discontinued operations $ 1,358 $ 317 $ (226) $ 56 $ 1,505 (a) Excludes a provision for losses on lending-related commitments of $68 million. As described in Note 1 ("Summary of Significant Accounting Policies"), under the heading “Allowance for Loan and Lease Losses” beginning on page 109 of our 2023 Form 10-K, we estimate the ALLL using relevant available information, from internal and external sources, relating to past events, current economic and portfolio conditions, and reasonable and supportable forecasts. In our estimation of expected credit losses, we use a two year reasonable and supportable period across all products. Following this two year period in which supportable forecasts can be generated, for all modeled loan portfolios, we revert expected credit losses to a level that is consistent with our historical information by reverting the macroeconomic variables (model inputs) to their long run average. We revert to historical loss rates for less complex estimation methods for smaller portfolios. A 20-year fixed length look back period is used to calculate the long run average of the macroeconomic variables. A four quarter reversion period is used where the macroeconomic variables linearly revert to their long run average following the two year reasonable and supportable period. We develop our reasonable and supportable forecasts using relevant data including, but not limited to, changes in economic output, unemployment rates, property values, and other factors associated with the credit losses on financial assets. Some macroeconomic variables apply to all portfolio segments, while others are more portfolio specific. The following table discloses key macroeconomic variables for each loan portfolio. Segment Portfolio Key Macroeconomic Variables (a) Commercial Commercial and industrial BBB corporate bond rate (spread), fixed investment, business bankruptcies, GDP, industrial production, unemployment rate, and Producer Price Index Commercial real estate Property & real estate price indices, unemployment rate, business bankruptcies, GDP, and SOFR Commercial lease financing BBB corporate bond rate (spread), GDP, and unemployment rate Consumer Real estate — residential mortgage GDP, home price index, unemployment rate, and 30 year mortgage rate Home equity Home price index, unemployment rate, and 30 year mortgage rate Other consumer Unemployment rate and U.S. household income Credit cards Unemployment rate and U.S. household income Discontinued operations Unemployment rate (a) Variables include all transformations and interactions with other risk drivers. Additionally, variables may have varying impacts at different points in the economic cycle. In addition to macroeconomic drivers, portfolio attributes such as remaining term, outstanding balance, risk ratings, utilization, FICO, LTV, and delinquency also drive ALLL changes. Our ALLL models were designed to capture the correlation between economic and portfolio changes. As such, evaluating shifts in individual portfolio attributes and macroeconomic variables in isolation may not be indicative of past or future performance. Economic Outlook As of September 30, 2024, the unemployment rate remained at a relatively low level, although job growth has moderated. Inflation has eased, largely due to restrictive monetary policy and a higher interest rate environment. Commercial real estate values continue to be under pressure, with the office class showing the most vulnerability. Economic uncertainty remains elevated, primarily due to geopolitical tensions and uncertainty surrounding the upcoming U.S. presidential election. We used the Moody’s August 2024 Consensus forecast as the baseline forecast to estimate expected credit losses as of September 30, 2024. We determined this forecast to be a reasonable view of the economic outlook, based on all available information at quarter end. The baseline scenario reflects continued economic resiliency, but slower growth for the remainder of 2024 and into 2025 as higher rates continue to take their toll. U.S. GDP is expected to grow at an annual rate of approximately 2.6% and 1.8% for 2024 and 2025, respectively, compared to 2.5% in 2023. The National Unemployment Rate was 4.2% in the third quarter of 2024, will remain steady into late-2025 according to the forecast. The forecast also assumes the Federal Funds rate begins to ease in the third quarter 2024, while the U.S. Consumer Price Index is forecasted at 3.0% for all of 2024. The outlook for the National Home Price Index has improved, now reflecting 3.3% growth through 2024, while the Commercial Real Estate Price Index is forecasted to drop 4% by the end of 2024. To the extent we identified credit risk considerations that were not captured by the third-party economic forecast, we addressed the risk through management’s qualitative adjustments to the ALLL. As a result of the current economic uncertainty, our future loss estimates may vary considerably from our September 30, 2024 assumptions. Commercial Loan Portfolio The ALLL from continuing operations for the commercial segment decreased by $50 million, or 4.3%, from June 30, 2024. The overall decrease in the commercial allowance was driven by changes in portfolio activity, including the effects of continuing balance sheet optimization efforts, partly offset by economic changes. The reserve decrease reflects strategic and ongoing loan attrition mostly within the C&I portfolio. The reserve decrease is offset by credit portfolio migration as well as impacts from the extended period of higher interest rates and the current inflationary environment. Consumer Loan Portfolio The ALLL from continuing operations for the consumer segment decreased by $3 million, or 0.8%, from June 30, 2024 . The overall decrease in the consumer allowance was driven by the impact of balance sheet optimization efforts, partly offset by credit quality normalization post-pandemic. Credit Risk Profile The prevalent risk characteristic for both commercial and consumer loans is the risk of loss arising from an obligor’s inability or failure to meet contractual payment or performance terms. Evaluation of this risk is stratified and monitored by the loan risk rating grades assigned for the commercial loan portfolios and the refreshed FICO score assigned for the consumer loan portfolios. The internal risk grades assigned to loans follow our definitions of Pass and Criticized, which are consistent with published definitions of regulatory risk classifications. Loans with a pass rating represent those loans not classified on our rating scale for credits, as minimal credit risk has been identified. Criticized loans are those loans that either have a potential weakness deserving management's close attention or have a well-defined weakness that may put full collection of contractual cash flows at risk. Borrower FICO scores provide information about the credit quality of our consumer loan portfolio as they provide an indication as to the likelihood that a debtor will repay its debts. The scores are obtained from a nationally recognized consumer rating agency and are presented in the tables below at the dates indicated. Most extensions of credit are subject to loan grading or scoring. Loan grades are assigned at the time of origination, verified by credit risk management, and periodically re-evaluated thereafter. This risk rating methodology blends our judgment with quantitative modeling. Commercial loans generally are assigned two internal risk ratings. The first rating reflects the probability that the borrower will default on an obligation; the second rating reflects expected recovery rates on the credit facility. Default probability is determined based on, among other factors, the financial strength of the borrower, an assessment of the borrower’s management, the borrower’s competitive position within its industry sector, and our view of industry risk in the context of the general economic outlook. Types of exposure, transaction structure, and collateral, including credit risk mitigants, affect the expected recovery assessment. Commercial Credit Exposure Credit Risk Profile by Creditworthiness Category and Vintage (a)(b) As of September 30, 2024 Term Loans Revolving Loans Amortized Cost Basis Revolving Loans Converted to Term Loans Amortized Cost Basis Amortized Cost Basis by Origination Year and Internal Risk Rating Dollars in millions 2024 2023 2022 2021 2020 Prior Total Commercial and Industrial Risk Rating: Pass $ 4,215 $ 3,330 $ 7,612 $ 4,309 $ 1,895 $ 4,090 $ 22,943 $ 117 $ 48,511 Criticized (Accruing) 76 224 664 442 261 414 1,779 38 3,898 Criticized (Nonaccruing) 22 19 106 35 3 43 137 — 365 Total commercial and industrial 4,313 3,573 8,382 4,786 2,159 4,547 24,859 155 52,774 Current year gross write-offs — 6 40 105 4 25 99 — 279 Real estate — commercial mortgage Risk Rating: Pass 623 808 3,127 2,344 629 3,338 865 42 11,776 Criticized (Accruing) 19 66 705 372 87 406 22 11 1,688 Criticized (Nonaccruing) — — 55 71 2 43 2 — 173 Total real estate — commercial mortgage 642 874 3,887 2,787 718 3,787 889 53 13,637 Current year gross write-offs — — — — — 21 1 — 22 Real estate — construction Risk Rating: Pass 60 757 1,172 466 88 93 35 2 2,673 Criticized (Accruing) — 16 116 142 68 78 — — 420 Criticized (Nonaccruing) — — — — — — — — — Total real estate — construction 60 773 1,288 608 156 171 35 2 3,093 Current year gross write-offs — — — — — — — — — Commercial lease financing Risk Rating: Pass 235 465 685 415 255 777 — — 2,832 Criticized (Accruing) 2 30 17 10 8 14 — — 81 Criticized (Nonaccruing) — — — — — — — — — Total commercial lease financing 237 495 702 425 263 791 — 2,913 Current year gross write-offs — — — — — 6 — — 6 Total commercial loans $ 5,252 $ 5,715 $ 14,259 $ 8,606 $ 3,296 $ 9,296 $ 25,783 $ 210 $ 72,417 Total commercial loan current year gross write-offs $ — $ 6 $ 40 $ 105 $ 4 $ 52 $ 100 $ — $ 307 As of December 31, 2023 Term Loans Revolving Loans Amortized Cost Basis Revolving Loans Converted to Term Loans Amortized Cost Basis Amortized Cost Basis by Origination Year and Internal Risk Rating Dollars in millions 2023 2022 2021 2020 2019 Prior Total Commercial and Industrial Risk Rating: Pass $ 4,020 $ 10,145 $ 6,141 $ 2,539 $ 2,064 $ 3,534 $ 24,395 $ 123 $ 52,961 Criticized (Accruing) 84 361 427 233 127 170 1,140 15 2,557 Criticized (Nonaccruing) 14 49 50 2 28 70 84 — 297 Total commercial and industrial 4,118 10,555 6,618 2,774 2,219 3,774 25,619 138 55,815 Current year gross write-offs 1 7 35 8 11 21 105 — 188 Real estate — commercial mortgage Risk Rating: Pass 1,084 3,664 2,922 804 1,545 2,507 1,017 66 13,609 Criticized (Accruing) 6 646 411 15 186 193 20 1 1,478 Criticized (Nonaccruing) — — 1 3 7 55 34 — 100 Total real estate — commercial mortgage 1,090 4,310 3,334 822 1,738 2,755 1,071 67 15,187 Current year gross write-offs — 1 1 11 2 21 3 — 39 Real estate — construction Risk Rating: Pass 401 1,185 912 157 62 48 31 8 2,804 Criticized (Accruing) 10 40 60 64 41 47 — — 262 Criticized (Nonaccruing) — — — — — — — — — Total real estate — construction 411 1,225 972 221 103 95 31 8 3,066 Current year gross write-offs — — — — — — — — — Commercial lease financing Risk Rating: Pass 520 878 575 352 307 808 — — 3,440 Criticized (Accruing) 11 30 9 9 8 16 — — 83 Criticized (Nonaccruing) — — — — — — — — — Total commercial lease financing 531 908 584 361 315 824 — — 3,523 Current year gross write-offs $ — $ — $ — $ — $ — $ — $ — $ — $ — Total commercial loans $ 6,150 $ 16,998 $ 11,508 $ 4,178 $ 4,375 $ 7,448 $ 26,721 $ 213 $ 77,591 Total commercial loan current year gross write-offs $ 1 $ 8 $ 36 $ 19 $ 13 $ 42 $ 108 $ — $ 227 (a) Accrued intere st of $344 million a nd $383 million as of September 30, 2024, and December 31, 2023, respectively, presented in Other Assets on the Consolidated Balance Sheets, was excluded from the amortized cost basis disclosed in these tables. (b) Gross write-off information is presented on a year-to-date basis for the nine months ended September 30, 2024 and the twelve months ended December 31, 2023. Consumer Credit Exposure Credit Risk Profile by FICO Score and Vintage (a)(b) As of September 30, 2024 Term Loans Revolving Loans Amortized Cost Basis Revolving Loans Converted to Term Loans Amortized Cost Basis Amortized Cost Basis by Origination Year and FICO Score Dollars in millions 2024 2023 2022 2021 2020 Prior Total Real estate — residential mortgage FICO Score: 750 and above $ 159 $ 692 $ 5,786 $ 7,290 $ 2,275 $ 1,566 $ — $ — $ 17,768 660 to 749 52 119 628 697 218 289 — — 2,003 Less than 660 2 15 82 64 26 140 — — 329 No Score 1 2 1 1 1 15 1 — 22 Total real estate — residential mortgage 214 828 6,497 8,052 2,520 2,010 1 — 20,122 Current period gross write-offs 1 — — — — 1 — — 2 Home equity loans FICO Score: 750 and above 26 33 142 798 631 758 1,926 269 4,583 660 to 749 14 20 54 191 134 198 792 88 1,491 Less than 660 1 5 16 40 30 87 272 25 476 No Score — — — — — 1 4 — 5 Total home equity loans 41 58 212 1,029 795 1,044 2,994 382 6,555 Current period gross write-offs — — — — — 1 1 — 2 Other consumer loans FICO Score: 750 and above 76 157 1,192 1,258 560 268 90 — 3,601 660 to 749 51 115 291 284 137 113 185 — 1,176 Less than 660 7 25 60 59 31 28 56 — 266 No Score 26 18 17 16 7 14 197 — 295 Total consumer direct loans 160 315 1,560 1,617 735 423 528 — 5,338 Current period gross write-offs — 5 13 9 5 5 12 — 49 Credit cards FICO Score: 750 and above — — — — — — 438 — 438 660 to 749 — — — — — — 368 — 368 Less than 660 — — — — — — 107 — 107 No Score — — — — — — 1 — 1 Total credit cards — — — — — — 914 — 914 Current period gross write-offs — — — — — — 35 — 35 Total consumer loans $ 415 $ 1,201 $ 8,269 $ 10,698 $ 4,050 $ 3,477 $ 4,437 $ 382 $ 32,929 Total consumer loan current period gross write-offs $ 1 $ 5 $ 13 $ 9 $ 5 $ 7 $ 48 $ — $ 88 As of December 31, 2023 Term Loans Revolving Loans Amortized Cost Basis Revolving Loans Converted to Term Loans Amortized Cost Basis Amortized Cost Basis by Origination Year and FICO Score Dollars in millions 2023 2022 2021 2020 2019 Prior Total Real estate — residential mortgage FICO Score: 750 and above $ 680 $ 5,992 $ 7,785 $ 2,392 $ 586 $ 923 $ — $ — $ 18,358 660 to 749 180 739 780 248 90 240 — — 2,277 Less than 660 15 58 56 22 17 130 — — 298 No Score 2 1 1 1 — 18 2 — 25 Total real estate — residential mortgage 877 6,790 8,622 2,663 693 1,311 2 — 20,958 Current period gross write-offs — — — — — 1 — — 1 Home equity loans FICO Score: 750 and above — 85 1,575 435 114 378 2,034 331 4,952 660 to 749 24 65 229 152 66 164 886 107 1,693 Less than 660 3 13 38 27 17 77 281 31 487 No Score 2 — — — — 1 4 — 7 Total home equity loans 29 163 1,842 614 197 620 3,205 469 7,139 Current period gross write-offs (1) — — — — 2 — 1 2 Other consumer loans FICO Score: 750 and above 185 1,187 1,455 660 277 112 97 — 3,973 660 to 749 150 365 342 171 83 60 199 — 1,370 Less than 660 24 64 65 32 17 16 57 — 275 No Score 30 33 17 11 10 12 185 — 298 Total consumer direct loans 389 1,649 1,879 874 387 200 538 — 5,916 Current period gross write-offs 1 12 10 6 5 3 14 — 51 Credit cards FICO Score: 750 and above — — — — — — 489 — 489 660 to 749 — — — — — — 400 — 400 Less than 660 — — — — — — 112 — 112 No Score — — — — — — 1 — 1 Total credit cards — — — — — — 1,002 — 1,002 Current period gross write-offs — — — — — — 37 — 37 Total consumer loans $ 1,295 $ 8,602 $ 12,343 $ 4,151 $ 1,277 $ 2,131 $ 4,747 $ 469 $ 35,015 Total consumer current period gross write-offs $ — $ 12 $ 10 $ 6 $ 5 $ 6 $ 51 $ 1 $ 91 (a) Accrued intere st of $135 million and $139 million as of September 30, 2024, and December 31, 2023, respectively, presented in Other Assets on the Consolidated Balance Sheets, was excluded from the amortized cost basis disclosed in this table. (b) Gross write-off information is presented on a year-to-date basis for the nine months ended September 30, 2024 and the twelve months ended December 31, 2023. Nonperforming and Past Due Loans Our policies for determining past due loans, placing loans on nonaccrual, applying payments on nonaccrual loans, and resuming accrual of interest for our commercial and consumer loan portfolios are disclosed in Note 1 (“Summary of Significant Accounting Policies”) under the heading “Nonperforming Loans” beginning on page 108 of our 2023 Form 10-K. The following aging analysis of past due and current loans as of September 30, 2024, and December 31, 2023, provides further information regarding Key’s credit exposure. Aging Analysis of Loan Portfolio (a) As of September 30, 2024 Current (b)(c) 30-59 Days Past Due (b) 60-89 Days Past Due (b) 90 and Greater Days Past Due (b) Non-performing Total Past Due and Non-performing Loans (b) Total Loans (d) Dollars in millions LOAN TYPE Commercial and industrial $ 52,258 $ 41 $ 37 $ 73 $ 365 $ 516 $ 52,774 Commercial real estate: Commercial mortgage 13,369 23 4 65 176 268 13,637 Construction 3,091 — — 2 — 2 3,093 Total commercial real estate loans 16,460 23 4 67 176 270 16,730 Commercial lease financing 2,913 — — — — — 2,913 Total commercial loans $ 71,631 $ 64 $ 41 $ 140 $ 541 $ 786 $ 72,417 Real estate — residential mortgage $ 20,022 $ 7 $ 6 $ — $ 87 $ 100 $ 20,122 Home equity loans 6,431 22 8 4 90 124 6,555 Other consumer loans 5,299 16 9 10 4 39 5,338 Credit cards 885 6 5 12 6 29 914 Total consumer loans $ 32,637 $ 51 $ 28 $ 26 $ 187 $ 292 $ 32,929 Total loans $ 104,268 $ 115 $ 69 $ 166 $ 728 $ 1,078 $ 105,346 (a) Amounts in table represent amortized cost and exclude loans held for sale. (b) Accrued inter est of $480 million p resented in “Accrued income and other assets” on the Consolidated Balance Sheets is excluded from the amortized cost basis disclosed in this table. (c) Includes balances of $100 million in Commercial mortgage and $5 million in Real estate - residential mortgage associated with loans sold to GNMA where Key has the right but not the obligation to repurchase. (d) Net of unearned income, net of deferred fees and costs, and unamortized discounts and premiums. As of December 31, 2023 Current (b) 30-59 Days Past Due (b) 60-89 Days Past Due (b) 90 and Greater Days Past Due (b) Non-performing Loans Total Past Due and Non-performing Loans (b) Total Loans (c) Dollars in millions LOAN TYPE Commercial and industrial $ 55,354 $ 62 $ 30 $ 72 $ 297 $ 461 $ 55,815 Commercial real estate: Commercial mortgage 15,049 25 3 10 100 138 15,187 Construction 3,065 1 — — — 1 3,066 Total commercial real estate loans 18,114 26 3 10 100 139 18,253 Commercial lease financing 3,520 2 1 — — 3 3,523 Total commercial loans $ 76,988 $ 90 $ 34 $ 82 $ 397 $ 603 $ 77,591 Real estate — residential mortgage $ 20,863 $ 17 $ 7 $ — $ 71 $ 95 $ 20,958 Home equity loans 7,001 27 10 4 97 138 7,139 Other consumer loans 5,877 16 10 9 4 39 5,916 Credit cards 974 6 5 12 5 28 1,002 Total consumer loans $ 34,715 $ 66 $ 32 $ 25 $ 177 $ 300 $ 35,015 Total loans $ 111,703 $ 156 $ 66 $ 107 $ 574 $ 903 $ 112,606 (a) Amounts in table represent amortized cost and exclude loans held for sale. (b) Accrued interest of $522 million presented in “Accrued income and other assets” on the Consolidated Balance Sheets is excluded from the amortized cost basis disclosed in this table. (c) Net of unearned income, net of deferred fees and costs, and unamortized discounts and premiums. At September 30, 2024, the carrying amount of our commercial nonperforming loans outstanding represented 83% of their original contractual amount owed, total nonperforming loans outstanding represented 86% of their original contractual amount owed, and nonperforming assets in total were carried at 89% of their original contractual amount owed. Nonperforming loans reduced expected interest income by $14 million and $41 million for t he three and nine months ended September 30, 2024, respectively, an d $10 million and $26 million for the three and nine months ended September 30, 2023, respectively. The amortized cost basis of nonperforming loans on nonaccrual status for which there is no related allowance for credit losses was $370 million at September 30, 2024 and $301 million at December 31, 2023 . As of September 30, 2024, 37% of our nonperforming loans were contractually current versus 41% as of December 31, 2023 . Collateral-dependent Financial Assets We classify financial assets as collateral-dependent when our borrower is experiencing financial difficulty, and we expect repayment to be provided substantially through the operation or sale of the collateral. Our commercial loans have collateral that includes cash, accounts receivable, inventory, commercial machinery, commercial properties, commercial real estate construction projects, enterprise value, and stock or ownership interests in the borrowing entity. Our consumer loans have collateral that includes residential real estate, automobiles, boats, and RVs. At September 30, 2024 and September 30, 2023, the recorded investment of consumer residential mortgage and home equity loans in the process of foreclosure was approximately $73 million and $92 million, respectively. There were no significant changes in the extent to which collateral secures our collateral-dependent financial assets during the three months ended September 30, 2024 . Loan Modifications Made to Borrowers Experiencing Financial Difficulty The ALLL for loans modified for borrowers experiencing financial difficulty is determined based on Key’s ALLL policy as described within Note 1 (“Summary of Significant Accounting Policies”) of our 2023 Form 10-K. Modifications for Borrowers Experiencing Financial Difficulty Our strategy in working with commercial borrowers is to allow them time to improve their financial position through loan modification. Commercial borrowers that are rated substandard or worse in accordance with the regulatory definition, or that cannot otherwise restructure at market terms and conditions, are considered to be experiencing financial difficulty. A modification of a loan is subject to the normal underwriting standards and processes for other similar credit extensions, both new and existing. The modified loan is evaluated to determine if it is a new loan or a continuation of the prior loan. Consumer loans in which a borrower requires a modification as a result of negative changes to their financial condition or to avoid default, generally indicate the borrower is experiencing financial difficulty. The primary modifications made to consumer loans are amortization, maturity date and interest rate changes. Consumer borrowers identified as experiencing financial difficulty are generally unable to refinance their loans through our normal origination channel or through other independent sources. The following tables show the amortized cost basis at the end of the noted reporting periods of the loans modified to borrowers experiencing financial difficulty within the past 12 months or since the adoption of ASU 2022-02 for the reporting period in 2023. The tables do not include those modifications that only resulted in an insignificant payment delay. The tables do not include consumer loans that are still within a trial modification period. Trial modifications may be done for consumer borrowers where a trial payment plan period is offered in advance of a permanent loan modification. As of September 30, 2024, there were 110 loans totaling $19 million in a trial modification period. As of September 30, 2023, there were 115 loans totaling $17 million in a trial modification period. Commitments outstanding to lend additional funds to borrowers experiencing financial difficulty whose loans were modified were $29 million and $67 million at September 30, 2024 and September 30, 2023, respectively. As of September 30, 2024 Interest Rate Reduction Term Extension Other Combination Total Dollars in millions Amortized Cost Basis Amortized Cost Basis Amortized Cost Basis Amortized Cost Basis Amortized Cost Basis % of Total Loan Type LOAN TYPE Commercial and Industrial $ — $ 126 $ 11 $ 16 $ 153 0.29 % Commercial real estate: Commercial mortgage 28 189 3 — 220 1.61 Construction — 27 — — 27 0.87 Total commercial real estate loans 28 216 3 — 247 1.48 Commercial lease financing — — — — — — Total commercial loans $ 28 $ 342 $ 14 $ 16 $ 400 0.55 % Real estate — residential mortgage 1 — — 11 12 0.06 Home equity loans 3 1 1 6 11 0.17 Other consumer loans — 1 — 2 3 0.06 Credit cards — — — 4 4 0.44 Total consumer loans 4 2 1 23 30 0.09 Total loans $ 32 $ 344 $ 15 $ 39 $ 430 0.41 % As of September 30, 2023 Interest Rate Reduction Term Extension Other Combination Total Dollars in millions Amortized Cost Basis Amortized Cost Basis Amortized Cost Basis Amortized Cost Basis Amortized Cost Basis % of Total Loan Type LOAN TYPE Commercial and Industrial $ — $ 158 $ 46 $ 31 $ 235 0.41 % Commercial real estate: Commercial mortgage — 7 — — 7 0.05 Construction — — — — — — Total commercial real estate loans — 7 — — 7 0.04 Commercial lease financing — — — — — — Total commercial loans $ — $ 165 $ 46 $ 31 $ 242 0.30 % Real estate — residential mortgage 1 — 7 8 0.04 Home equity loans 1 — 1 5 7 0.10 Other consumer loans — 1 — 1 2 0.03 Credit cards — — — 3 3 0.30 Total consumer loans 2 1 1 16 20 0.06 Total loans $ 2 $ 166 $ 47 $ 47 $ 262 0.23 % Combination modifications consist primarily of loans modified with both an interest rate reduction and a term extension. Financial Effects of Modifications to Borrowers Experiencing Financial Difficulty The following table summarizes the financial impacts of loan modifications made to specific loans for the noted periods. Three months ended September 30, 2024 Weighted-average Interest Rate Change Weighted-average Term Extension (in years) LOAN TYPE Commercial and Industrial (17.00) % 0.42 Commercial mortgage — % 0.43 Real estate — residential mortgage (1.85) % 2.47 Home equity loans (4.68) % 5.60 Other consumer loans (4.18) % 0.40 Credit cards (12.13) % 0.25 Nine months ended September 30, 2024 Weighted-average Interest Rate Change Weighted-average Term Extension (in years) LOAN TYPE Commercial and Industrial (6.29) % 1.14 Commercial mortgage (1.91) % 0.20 Construction — % 3.20 Real estate — residential mortgage (1.73) % 5.77 Home equity loans (3.75) % 6.44 Other consumer loans (3.90) % 0.62 Credit cards (15.21) % 0.75 Three months ended September 30, 2023 Weighted-average Interest Rate Change Weighted-average Term Extension (in years) LOAN TYPE Commercial and Industrial 0.21 % 0.85 Real estate — residential mortgage (1.55) % 12.24 Home equity loans (3.71) % 5.56 Other consumer loans (4.65) % 1.32 Credit cards (11.52) % 0.75 Nine months ended September 30, 2023 Weighted-average Interest Rate Change Weighted-average Term Extension (in years) LOAN TYPE Commercial and Industrial 0.34 % 0.54 Commercial mortgage — % 1.08 Real estate — residential mortgage (2.03) % 7.56 Home equity loans (4.13) % 6.15 Other consumer loans (4.38) % 0.99 Credit cards (14.05) % 0.75 Amortized Cost Basis of Modified Loans That Subsequently Defaulted Key considers modifications to borrowers experiencing financial difficulty that subsequently become 90 days or more past due under modified terms as subsequently defaulted. The following table presents the amortized cost of modified loans of borrowers experiencing financial difficulty in the past twelve months that subsequently defaulted within the noted periods. Three months ended September 30, 2024 Dollars in millions Interest Rate Reduction Term Extension Other Combination Total LOAN TYPE Commercial and Industrial $ — $ 1 $ — $ — $ 1 Commercial real estate Commercial mortgage 28 — — 1 29 Construction — — — — — Total commercial real estate loans 28 — — 1 29 Total commercial loans 28 1 — 1 30 Home equity loans $ — $ — $ — $ — $ — Total consumer loans $ — $ — $ — $ — $ — Total loans $ 28 $ 1 $ — $ 1 $ 30 Nine months ended September 30, 2024 Dollars in millions Interest Rate Reduction Term Extension Other Combination Total LOAN TYPE Commercial and Industrial $ — $ 17 $ — $ 1 $ 18 Commercial real estate Commercial mortgage 28 — 1 29 Construction — — — — — Total commercial real estate loans 28 — — 1 29 Total commercial loans 28 17 — 2 47 Home equity loans — — — 1 1 Total consumer loans $ — $ — $ — $ 1 $ 1 Total loans $ 28 $ 17 $ — $ 3 $ 48 There were $3 million and $10 million of loans that were modified for borrowers experiencing financial difficulty that received modifications and subsequently defaulted during the three and nine months ended September 30, 2023, respectively. Key closely monitors the performance of loans that are modified for borrowers experiencing financial difficulty to understand the effectiveness of its modification efforts. The following table depicts the performance of loans that have been modified for borrowers e

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2024
Fair Value Disclosures [Abstract]
Fair Value Measurements	5. Fair Value Measurements In accordance with GAAP, Key measures certain assets and liabilities at fair value. Fair value is defined as the price to sell an asset or transfer a liability in an orderly transaction between market participants in the principal market of the asset or liability. Additional information regarding our accounting policies for determining fair value is provided in Note 6 (“Fair Value Measurements”) and Note 1 (“Summary of Significant Accounting Policies”) under the heading “Fair Value Measurements” of our 2023 Form 10-K. Assets and Liabilities Measured at Fair Value on a Recurring Basis Certain assets and liabilities are measured at fair value on a recurring basis in accordance with GAAP. For more information on the valuation techniques used to measure classes of assets and liabilities reported at fair value on a recurring basis as well as the classification of each in the valuation hierarchy, refer to Note 6 (“Fair Value Measurements”) in our 2023 Form 10-K. The following tables present these assets and liabilities at September 30, 2024, and December 31, 2023. September 30, 2024 December 31, 2023 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Dollars in millions ASSETS MEASURED ON A RECURRING BASIS Trading account assets: U.S. Treasury, agencies and corporations $ — $ 928 $ — $ 928 $ — $ 685 $ — $ 685 States and political subdivisions — 102 — 102 — 93 — 93 Other mortgage-backed securities — 355 — 355 — 340 — 340 Other securities — 14 — 14 — 21 — 21 Total trading account securities — 1,399 — 1,399 — 1,139 — 1,139 Commercial loans — 5 — 5 — 3 — 3 Total trading account assets — 1,404 — 1,404 — 1,142 — 1,142 Securities available for sale: U.S. Treasury, agencies and corporations — 9,223 — 9,223 — 9,026 — 9,026 Agency residential collateralized mortgage obligations — 12,991 — 12,991 — 15,478 — 15,478 Agency residential mortgage-backed securities — 7,321 — 7,321 — 3,589 — 3,589 Agency commercial mortgage-backed securities — 4,634 — 4,634 — 9,092 — 9,092 Other securities — — — — — — — — Total securities available for sale — 34,169 — 34,169 — 37,185 — 37,185 Other investments: Principal investments: Direct — — — — — — — — Indirect (measured at NAV) (a) — — — 16 — — — 17 Total principal investments — — — 16 — — — 17 Equity investments: Direct — 6 3 9 — — 2 2 Direct (measured at NAV) (a) — — — 45 — — — 40 Indirect (measured at NAV) (a) — — — 3 — — — 4 Total equity investments — 6 3 57 — — 2 46 Total other investments — 6 3 73 — — 2 63 Loans, net of unearned income (residential) — — 9 9 — — 9 9 Loans held for sale (residential) — 61 — 61 — 51 — 51 Derivative assets: Interest rate — 179 7 186 — 175 (2) 173 Foreign exchange 48 22 — 70 74 15 — 89 Commodity — 423 — 423 — 721 — 721 Credit — — — — — — — — Other — 10 1 11 — 14 2 16 Derivative assets 48 634 8 690 74 925 — 999 Netting adjustments (b) — — — (499) — — — (818) Total derivative assets 48 634 8 191 74 925 — 181 Total assets on a recurring basis at fair value $ 48 $ 36,274 $ 20 $ 35,907 $ 74 $ 39,303 $ 11 $ 38,631 LIABILITIES MEASURED ON A RECURRING BASIS Bank notes and other short-term borrowings: Short positions $ 79 $ 780 $ — $ 859 $ 30 $ 774 $ — $ 804 Derivative liabilities: Interest rate 1 694 — 695 — 985 — 985 Foreign exchange 40 23 — 63 58 15 — 73 Commodity — 401 — 401 — 698 — 698 Credit — 17 — 17 — 1 — 1 Other — 7 — 7 — 20 — 20 Derivative liabilities 41 1,142 — 1,183 58 1,719 — 1,777 Netting adjustments (b) — — — (343) — — — (473) Total derivative liabilities 41 1,142 — 840 58 1,719 — 1,304 Total liabilities on a recurring basis at fair value $ 120 $ 1,922 $ — $ 1,699 $ 88 $ 2,493 $ — $ 2,108 (a) Certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated balance sheet. (b) Netting adjustments represent the amounts recorded to convert our derivative assets and liabilities from a gross basis to a net basis in accordance with the applicable accounting guidance. The net basis takes into account the impact of bilateral collateral and master netting agreements that allow us to settle all derivative contracts with a single counterparty on a net basis and to offset the net derivative position with the related cash collateral. Total derivative assets and liabilities include these netting adjustments. The following table presents the fair value of our direct and indirect principal investments and related unfunded commitments at September 30, 2024, as well as financial support provided for the three and nine months ended September 30, 2024, and September 30, 2023. Financial support provided Three months ended September 30, Nine months ended September 30, September 30, 2024 2024 2023 2024 2023 Dollars in millions Fair Value Unfunded Funded Funded Other Funded Funded Other Funded Funded Other Funded Funded Other INVESTMENT TYPE Direct investments $ — $ — $ — $ — $ — $ — $ — $ — $ — $ — Indirect investments (measured at NAV) (a) 16 1 — — — — — — — — Total $ 16 $ 1 $ — $ — $ — $ — $ — $ — $ — $ — (a) Our indirect investments consist of buyout funds, venture capital funds, and fund of funds. These investments are generally not redeemable. Instead, distributions are received through the liquidation of the underlying investments of the fund. An investment in any one of these funds typically can be sold only with the approval of the fund’s general partners. At September 30, 2024, no significant liquidation of the underlying investments has been communicated to Key. The purpose of funding our capital commitments to these investments is to allow the funds to make additional follow-on investments and pay fund expenses until the fund dissolves. We, and all other investors in the fund, are obligated to fund the full amount of our respective capital commitments to the fund based on our and their respective ownership percentages, as noted in the applicable Limited Partnership Agreement. Changes in Level 3 Fair Value Measurements The following table shows the components of the change in the fair values of our Level 3 financial instruments measured at fair value on a recurring basis for the three and nine months ended September 30, 2024, and September 30, 2023. Dollars in millions Beginning of Period Balance Gains (Losses) Included in Other Comprehensive Income Gains (Losses) Included in Earnings Purchases Sales Settlements Transfers Other Transfers into Level 3 Transfers out of Level 3 End of Period Balance Unrealized Gains (Losses) Included in Earnings Nine months ended September 30, 2024 Other investments Equity investments Direct (a) $ 2 $ — $ 1 $ — $ — $ — $ — $ — $ — $ 3 — Loans, net of unearned income (residential) 9 — — — — — (2) — 2 9 — Derivative instruments (b) Interest rate (2) — (5) (c) 7 — — — 2 (d) 5 (d) 7 — Other (e) 2 — — (c) — — — (1) — — 1 — Three months ended September 30, 2024 Other investments Equity investments Direct (a) $ 2 $ — $ 1 $ — $ — $ — $ — $ — $ — $ 3 — Loans, net of unearned income (residential) 11 — — — — — (2) — — 9 — Derivative instruments (b) Interest rate (2) — 2 (c) 6 — — — 1 (d) — (d) 7 — Other (e) 1 — — (c) — — — — — — 1 — Dollars in millions Beginning of Period Balance Gains (Losses) Included in Other Comprehensive Income Gains (Losses) Included in Earnings Purchases Sales Settlements Transfers Other Transfers into Level 3 Transfers out of Level 3 End of Period Balance Unrealized Gains (Losses) Included in Earnings Nine months ended September 30, 2023 Other investments Principal investments Direct (a) $ 1 $ — $ — $ — $ — $ — $ — $ — $ — $ 1 $ — Equity investments Direct (a) 2 — — — — — — — — 2 — Loans, net of unearned income (residential) 9 — — — — — — — — 9 — Derivative instruments (b) Interest rate 2 — (23) (c) 18 1 — — (3) (d) 6 (d) 1 — Credit (2) — — (c) — — — — — — Other (e) — — — (c) — — — — — (1) (1) — Three months ended September 30, 2023 Other investments Principal investments Direct (a) $ 1 $ — $ — $ — $ — $ — $ — $ — $ — $ 1 $ — Equity investments Direct (a) 2 — — — — — — — — 2 — Loans, net of unearned income (residential) 9 — — — — — — — — 9 — Derivative instruments (b) Interest rate 5 — (6) (c) — — — — — (d) 2 (d) 1 — Credit — — — (c) — — — — — — — — Other (e) 1 — — (c) — — — (2) — — (1) — (a) Realized and unrealized gains and losses on principal investments and other equity investments are reported in “other income” on the income statement. (b) Amounts represent Level 3 derivative assets less Level 3 derivative liabilities. (c) Realized and unrealized gains and losses on derivative instruments are reported in “corporate services income” and “other income” on the income statement. (d) Certain instruments previously classified as Level 2 were transferred to Level 3 because Level 3 unobservable inputs became significant. Certain derivatives previously classified as Level 3 were transferred to Level 2 because Level 3 unobservable inputs became less significant. (e) Amounts represent Level 3 interest rate lock commitments. Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis Certain assets and liabilities are measured at fair value on a nonrecurring basis in accordance with GAAP. The adjustments to fair value generally result from the application of accounting guidance that requires assets and liabilities to be recorded at the lower of cost or fair value, or assessed for impairment. For more information on the valuation techniques used to measure classes of assets and liabilities measured at fair value on a nonrecurring basis, refer to Note 6 (“Fair Value Measurements”) in our 2023 Form 10-K. There were no liabilities measured at fair value on a nonrecurring basis at September 30, 2024, and December 31, 2023. The following table presents our assets measured at fair value on a nonrecurring basis at September 30, 2024, and December 31, 2023: September 30, 2024 December 31, 2023 Dollars in millions Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total ASSETS MEASURED ON A NONRECURRING BASIS Collateral-dependent loans $ — $ — $ 150 $ 150 $ — $ — $ 104 $ 104 Accrued income and other assets — — 25 25 — — 29 29 Total assets on a nonrecurring basis at fair value $ — $ — $ 175 $ 175 $ — $ — $ 133 $ 133 We have other investments in equity securities that do not have readily determinable fair values and do not qualify for the practical expedient to measure the investment using a net asset value per share. We have elected to measure these securities at cost less impairment plus or minus adjustments due to observable orderly transactions. Impairment is recorded when there is evidence that the expected fair value of the investment has declined to below the recorded cost. At each reporting period, we assess if these investments continue to qualify for this measurement alternative. At September 30, 2024, and December 31, 2023, the carrying amount of equity investments under this method was $386 million and $339 million, respectively. No adjustments or impairments were recorded for the three months ended September 30, 2024. Quantitative Information about Level 3 Fair Value Measurements The range and weighted-average of the significant unobservable inputs used to measure the fair value of our material Level 3 recurring and nonrecurring assets at September 30, 2024, and December 31, 2023, along with the valuation techniques used, are shown in the following table: Level 3 Asset (Liability) Valuation Technique Significant Unobservable Input Range (Weighted-Average) (a), (b) Dollars in millions September 30, 2024 December 31, 2023 September 30, 2024 December 31, 2023 Recurring Loans, net of unearned income (residential) $ 9 $ 9 Market comparable pricing Comparability factor 61.71 - 95.00% (73.33%) 62.67-89.60% (70.83%) Derivative instruments: Interest rate 7 2 Discounted cash flows Probability of default .02 - 100% (4.30%) .02 - 100% (5.30%) Loss given default 0 - 1 (.491) 0 - 1 (.477) Insignificant level 3 assets, net of liabilities (c) 4 4 Nonrecurring Collateral-dependent loans 150 104 Fair value of collateral Credit and liquidity discount 0 - 100.00% (23.00%) 0 - 10.00% (5.00%) Accrued income and other assets: OREO and other Level 3 assets (d) 13 21 Appraised value Appraised value N/M N/M (a) The weighted average of significant unobservable inputs is calculated using a weighting relative to fair value. (b) For significant unobservable inputs with no range, a single figure is reported to denote the single quantitative factor used. (c) Represents the aggregate amount of Level 3 assets and liabilities measured at fair value on a recurring basis that are individually and in the aggregate insignificant. The amount includes certain equity investments and certain financial derivative assets and liabilities. (d) Excludes $12 million and $8 million pertaining to mortgage servicing assets measured at fair value as of September 30, 2024 and December 31, 2023, respectively. Refer to Note 8 (“Mortgage Servicing Assets”) for significant unobservable inputs pertaining to these assets. Fair Value Disclosures of Financial Instruments The Levels in the fair value hierarchy ascribed to our financial instruments and the related carrying amounts at September 30, 2024, and December 31, 2023, are shown in the following tables. Assets and liabilities are further arranged by measurement category. September 30, 2024 Fair Value Dollars in millions Carrying Amount Level 1 Level 2 Level 3 Measured at NAV Netting Adjustment Total ASSETS (by measurement category) Fair value - net income Trading account assets (b) $ 1,404 $ — $ 1,404 $ — $ — $ — $ 1,404 Other investments (b) 1,117 — 6 1,047 64 — 1,117 Loans, net of unearned income (residential) (d) 9 — — 9 — — 9 Loans held for sale (residential) (b) 61 — 61 — — — 61 Derivative assets - trading (b) 212 48 642 8 — (486) (f) 212 Fair value - OCI Securities available for sale (b) 34,169 — 34,169 — — — 34,169 Derivative assets - hedging (b)(g) (21) — (8) — — (13) (f) (21) Amortized cost Held-to-maturity securities (c) 7,702 — 7,317 — — — 7,317 Loans, net of unearned income (d) 103,843 — — 100,480 — — 100,480 Loans held for sale (b) 997 — — 997 — — 997 Other Cash and other short-term investments (a) 24,072 24,072 — — — — 24,072 LIABILITIES (by measurement category) Fair value - net income Derivative liabilities - trading (b) $ 836 $ 41 $ 1,122 $ — $ — $ (327) (f) $ 836 Fair value - OCI Derivative liabilities - hedging (b)(g) 4 — 20 — — (16) (f) 4 Amortized cost Time deposits (e) 18,352 — 18,505 — — — 18,505 Short-term borrowings (a) 2,403 79 2,324 — — — 2,403 Long-term debt (e) 15,677 11,842 3,796 — — — 15,638 Other Deposits with no stated maturity (a) 132,001 — 132,001 — — — 132,001 December 31, 2023 Fair Value Dollars in millions Carrying Amount Level 1 Level 2 Level 3 Measured at NAV Netting Adjustment Total ASSETS (by measurement category) Fair value - net income Trading account assets (b) $ 1,142 $ — $ 1,142 $ — $ — $ — $ 1,142 Other investments (b) 1,244 — — 1,183 61 — 1,244 Loans, net of unearned income (residential) (d) 9 — — 9 — — 9 Loans held for sale (residential) (b) 51 — 51 — — — 51 Derivative assets - trading (b) 168 $ 74 886 — — (792) (f) 168 Fair value - OCI Securities available for sale (b) 37,185 — 37,185 — — — 37,185 Derivative assets - hedging (b)(g) 13 — 39 — — (26) (f) 13 Amortized cost Held-to-maturity securities (c) 8,575 — 8,056 — — — 8,056 Loans, net of unearned income (d) 111,089 — — 105,950 — — 105,950 Loans held for sale (b) 432 — — 432 — — 432 Other Cash and other short-term investments (a) 11,758 11,758 — — — — 11,758 LIABILITIES (by measurement category) Fair value - net income Derivative liabilities - trading (b) $ 1,304 $ 58 $ 1,707 $ — $ — $ (461) (f) $ 1,304 Fair value - OCI Derivative liabilities - hedging (b)(g) — — 12 — — (12) (f) — Amortized cost Time deposits (e) 14,776 — 14,911 — — — 14,911 Short-term borrowings (a) 3,091 30 3,061 — — — 3,091 Long-term debt (e) 19,554 11,288 7,720 — — — 19,008 Other Deposits with no stated maturity (a) 130,811 — 130,811 — — — 130,811 Valuation Methods and Assumptions (a) Fair value equals or approximates carrying amount. The fair value of deposits with no stated maturity does not take into consideration the value ascribed to core deposit intangibles. (b) Information pertaining to our methodology for measuring the fair values of these assets and liabilities is included in the sections entitled “Qualitative Disclosures of Valuation Techniques” and “Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis” within our 2023 Form 10-K Note 6 (“Fair Value Measurements”). Investments accounted for under the cost method (or cost less impairment adjusted for observable price changes for certain equity investments) are classified as Level 3 assets. These investments are not actively traded in an open market as sales for these types of investments are rare. The carrying amount of the investments carried at cost are adjusted for declines in value if they are considered to be other-than-temporary (or due to observable orderly transactions of the same issuer for equity investments eligible for the cost less impairment measurement alternative). These adjustments are included in “other income” on the income statement. (c) Fair values of held-to-maturity securities are determined by using models that are based on security-specific details, as well as relevant industry and economic factors. The most significant of these inputs are quoted market prices, interest rate spreads on relevant benchmark securities, and certain prepayment assumptions. We review the valuations derived from the models to ensure that they are reasonable and consistent with the values placed on similar securities traded in the secondary markets. (d) The fair value of loans is based on the present value of the expected cash flows. The projected cash flows are based on the contractual terms of the loans, adjusted for prepayments and use of a discount rate based on the relative risk of the cash flows, taking into account the loan type, maturity of the loan, liquidity risk, servicing costs, and a required return on debt and capital. In addition, an incremental liquidity discount is applied to certain loans, using historical sales of loans during periods of similar economic conditions as a benchmark. The fair value of loans includes lease financing receivables at their aggregate carrying amount, which is equivalent to their fair value. (e) Fair values of time deposits and long-term debt classified as Level 2 are based on discounted cash flows utilizing relevant market inputs. (f) Netting adjustments represent the amounts recorded to convert our derivative assets and liabilities from a gross basis to a net basis in accordance with the applicable accounting guidance. The net basis takes into account the impact of bilateral collateral and master netting agreements that allow us to settle all derivative contracts with a single counterparty on a net basis and to offset the net derivative position with the related cash collateral. Total derivative assets and liabilities include these netting adjustments. (g) Derivative assets-hedging and derivative liabilities-hedging includes both cash flow and fair value hedges. Additional information regarding our accounting policies for cash flow and fair value hedges is provided in Note 1 (“Summary of Significant Accounting Policies”) under the heading “Derivatives and Hedging” beginning on page 112 of our 2023 Form 10-K. Discontinued assets — education lending business . Our discontinued assets include government-guaranteed and private education loans originated through our education lending business that was discontinued in September 2009. This portfolio consists of loans recorded at carrying value with appropriate valuation reserves. All of these loans were excluded from the table above as follows: • Loans at carrying value, net of allowance, of $272 million ($203 million at fair value) at September 30, 2024, and $339 million ($264 million at fair value) at December 31, 2023. These loans and securities are classified as Level 3 because we rely on unobservable inputs when determining fair value since observable market data is not available.

Securities

Securities	9 Months Ended
	Sep. 30, 2024
Investments, Debt and Equity Securities [Abstract]
Securities	6. Securities The amortized cost, unrealized gains and losses, and approximate fair value of our securities available for sale and held-to-maturity securities are presented in the following tables. Gross unrealized gains and losses represent the difference between the amortized cost and the fair value of securities on the balance sheet as of the dates indicated. Accordingly, the amount of these gains and losses may change in the future as market conditions change. September 30, 2024 December 31, 2023 Dollars in millions Amortized Cost (a) Gross Unrealized Gains Gross Unrealized Losses Fair Value Amortized Cost (b) Gross Unrealized Gains Gross Unrealized Losses Fair Value SECURITIES AVAILABLE FOR SALE U.S. Treasury, agencies, and corporations $ 9,156 $ 97 $ 30 $ 9,223 $ 9,300 $ 6 $ 280 $ 9,026 Agency residential collateralized mortgage obligations 15,647 7 2,663 12,991 18,911 4 3,437 15,478 Agency residential mortgage-backed securities 7,808 23 510 7,321 4,189 — 600 3,589 Agency commercial mortgage-backed securities 5,002 — 368 4,634 10,295 — 1,203 9,092 Total securities available for sale $ 37,613 $ 127 $ 3,571 $ 34,169 $ 42,695 $ 10 $ 5,520 $ 37,185 HELD-TO-MATURITY SECURITIES Agency residential collateralized mortgage obligations $ 4,743 $ 8 $ 218 $ 4,533 $ 5,170 $ 9 $ 283 $ 4,896 Agency residential mortgage-backed securities 154 — 11 143 165 — 13 152 Agency commercial mortgage-backed securities 2,385 2 153 2,234 2,473 1 204 2,270 Asset-backed securities (c) 394 — 13 381 738 — 29 709 Other securities 26 — — 26 29 — — 29 Total held-to-maturity securities $ 7,702 $ 10 395 $ 7,317 $ 8,575 $ 10 $ 529 $ 8,056 (a) Amortized cost amounts exclude accrued interes t receivable which is recorded within Other Assets on the balance sheet. At September 30, 2024, accrued interest receivable on available for sale securities and held-to-maturity securities totaled $77 million and $22 million , respectively. (b) Amortized cost amounts exclude accrued interes t receivable which is recorded within Other Assets on the balance sheet. At December 31, 2023, accrued interest receivable on available for sale securities and held-to-maturity securities totaled $64 million and $25 million , respectively. (c) Consists primarily of $388 million of securities as of September 30, 2024, and $731 million of securities as of December 31, 2023, related to the purchase of senior notes from a securitization collateralized by sold indirect auto loans. The following table summarizes securities in an unrealized loss position for which an allowance for credit losses has not been recorded as of September 30, 2024, and December 31, 2023. Duration of Unrealized Loss Position Less than 12 Months 12 Months or Longer Total Dollars in millions Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses September 30, 2024 Securities available for sale: U.S Treasury, agencies, and corporations $ 3,228 $ 3 $ 766 $ 27 $ 3,994 $ 30 Agency residential collateralized mortgage obligations 93 — 11,807 2,663 11,900 2,663 Agency residential mortgage-backed securities 2,012 12 3,369 498 5,381 510 Agency commercial mortgage-backed securities — — 4,583 368 4,583 368 Held-to-maturity securities: Agency residential collateralized mortgage obligations 164 2 3,585 216 3,749 218 Agency residential mortgage-backed securities — — 143 11 143 11 Agency commercial mortgage-backed securities — — 2,162 153 2,162 153 Asset-backed securities — — 381 13 381 13 Other securities — — 8 — 8 — Total securities in an unrealized loss position $ 5,497 $ 17 $ 26,804 $ 3,949 $ 32,301 $ 3,966 December 31, 2023 Securities available for sale: U.S. Treasury, agencies, and corporations $ — $ — $ 8,532 $ 280 $ 8,532 $ 280 Agency residential collateralized mortgage obligations — — 14,979 3,437 14,979 3,437 Agency residential mortgage-backed securities 24 — 3,562 600 3,586 600 Agency commercial mortgage-backed securities 891 49 8,201 1,154 9,092 1,203 Held-to-maturity securities: Agency residential collateralized mortgage obligations 1,123 30 3,070 253 4,193 283 Agency residential mortgage-backed securities — — 152 13 152 13 Agency commercial mortgage-backed securities — — 2,199 204 2,199 204 Asset-backed securities — — 709 29 709 29 Other securities 17 — (a) 12 — 29 — Total securities in an unrealized loss position $ 2,055 $ 79 $ 41,416 $ 5,970 $ 43,471 $ 6,049 (a) At December 31, 2023, gross unrealized losses totaled less than $1 million for other securities held-to-maturity with a loss duration of less than 12 months. Based on our evaluation at September 30, 2024, an allowance for credit losses has not been recorded nor have unrealized losses been recognized into income. The issuers of the securities are of high credit quality and have a history of no credit losses, management does not intend to sell, and it is likely that management will not be required to sell the securities prior to their anticipated recovery, and the decline in fair value is largely attributed to changes in interest rates and other market conditions. The issuers continue to make timely principal and interest payments. For the three months ended September 30, 2024 , we had no gross realized gains and recognized $935 million in gross realized losses from the sale of securities available for sale. For the three months ended September 30, 2023, we recognized no realized gains or losses from the sale of securities available for sale. For the nine months ended September 30, 2024, we had no gross realized gains and recognized $948 million in gross realized losses from the sale of securities available for sale. For the nine months ended September 30, 2023, we recognized no realized gains or losses from the sale of securities available for sale. At September 30, 2024, securities available for sale and held-to-maturity securities totaling $22.9 billion we re pledged to secure securities sold under repurchase agreements, to secure public and trust deposits, to facilitate access to secured funding, and for other purposes required or permitted by law. The following table shows our securities by remaining maturity at September 30, 2024. CMOs, other mortgage-backed securities, and asset-backed securities in the available for sale portfolio and held-to-maturity portfolio are presented based on their expected average lives. The remaining securities, in both the available-for-sale and held-to-maturity portfolios, are presented based on their remaining contractual maturity. Actual maturities may differ from expected or contractual maturities since borrowers have the right to prepay obligations with or without prepayment penalties. September 30, 2024 Securities Available for Sale Held to Maturity Securities Dollars in millions Amortized Cost Fair Value Amortized Cost Fair Value Due in one year or less $ 2,695 $ 2,688 $ 78 $ 76 Due after one through five years 12,034 11,778 3,444 3,336 Due after five through ten years 14,339 12,301 2,396 2,257 Due after ten years 8,545 7,402 1,784 1,648 Total $ 37,613 $ 34,169 $ 7,702 $ 7,317

Derivatives and Hedging Activit

Derivatives and Hedging Activities	9 Months Ended
	Sep. 30, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives and Hedging Activities	7. Derivatives and Hedging Activities We are a party to various derivative instruments, mainly through our subsidiary, KeyBank. The primary derivatives that we use are interest rate swaps, caps, floors, forwards, and futures; foreign exchange contracts; commodity derivatives; and credit derivatives. Generally, these instruments help us manage exposure to interest rate risk, mitigate the credit risk inherent in our loan portfolio, hedge against changes in foreign currency exchange rates, and facilitate client financing and hedging needs. At September 30, 2024, after taking into account the effects of bilateral collateral and master netting agreements, we had $21 million of derivative assets and $4 million of derivative liabilities that relate to contracts designated as hedging instruments. As a result of bilateral collateral and master netting agreements, which are applied at the counterparty level, we could have derivative contracts with negative fair values included in derivative assets and contracts with positive fair values included in derivative liabilities related to counterparties with which we have both hedging and trading derivatives. As of the same date, after taking into account the effects of bilateral collateral and master netting agreements and a reserve for potential future losses, we had derivative assets of $212 million and derivative liabilities of $836 million that were not designated as hedging instruments. These positions are primarily comprised of derivative contracts entered into for client accommodation purposes. Additional information regarding our accounting policies for derivatives is provided in Note 1 (“Summary of Significant Accounting Policies”) under the heading “Derivatives and Hedging” beginning on page 112 of our 2023 Form 10-K. Our derivative strategies and related risk management objectives are described in Note 8 (“Derivatives and Hedging Activities”) beginning on page 142 of our 2023 Form 10-K. Fair Values, Volume of Activity, and Gain/Loss Information Related to Derivative Instruments The following table summarizes the fair values of our derivative instruments on a gross and net basis as of September 30, 2024, and December 31, 2023. Total derivative assets and liabilities are adjusted to take into account the impact of legally enforceable master netting agreements that allow us to settle all derivative contracts with a single counterparty on a net basis and to offset the net derivative position with the related cash collateral. Securities collateral related to legally enforceable master netting agreements is not offset on the balance sheet. Our derivative instruments are included in “accrued income and other assets” or “accrued expenses and other liabilities” on the Consolidated Balance Sheets, as follows: September 30, 2024 December 31, 2023 Fair Value (a) Fair Value (a) Dollars in millions Notional Derivative Assets Derivative Liabilities Notional Amount Derivative Assets Derivative Liabilities Derivatives designated as hedging instruments: Interest rate $ 58,507 $ (8) $ 20 $ 44,621 $ 39 $ 12 Derivatives not designated as hedging instruments: Interest rate 72,584 194 675 78,051 134 973 Foreign exchange 6,383 70 63 6,034 89 73 Commodity 8,832 423 401 11,611 721 698 Credit 136 — 17 121 — 1 Other (b) 3,147 11 7 2,683 16 20 Total derivatives not designated as hedging instruments: 91,082 698 1,163 98,500 960 1,765 Netting adjustments (c) — (499) (343) — (818) (473) Net derivatives in the balance sheet 149,589 191 840 143,121 181 1,304 Other collateral (d) — — (2) — (1) (18) Net derivative amounts $ 149,589 $ 191 $ 838 $ 143,121 $ 180 $ 1,286 (a) We take into account bilateral collateral and master netting agreements that allow us to settle all derivative contracts held with a single counterparty on a net basis, and to offset the net derivative position with the related cash collateral when recognizing derivative assets and liabilities. As a result, we could have derivative contracts with negative fair values included in derivative assets and contracts with positive fair values included in derivative liabilities. (b) Other derivatives include interest rate lock commitments related to our residential and commercial banking activities, forward sale commitments related to our residential mortgage banking activities, forward purchase and sales contracts consisting of contractual commitments associated with “to be announced” securities and when-issued securities, and other customized derivative contracts. (c) Netting adjustments represent the amounts recorded to convert our derivative assets and liabilities from a gross basis to a net basis in accordance with the applicable accounting guidance. As of September 30, 2024, excess collateral that has not been offset against net derivative instrument positions totaled $170 million of cash collateral and $261 million of securities collateral posted as well as $30 million of cash collateral and $188 million of securities collateral held. As of December 31, 2023, excess collateral that has not been offset against net derivative instrument positions totaled $161 million of cash collateral and $269 million of securities collateral posted as well as $16 million of cash collateral and $212 million of securities collateral held. (d) Other collateral represents the amount that cannot be used to offset our derivative assets and liabilities from a gross basis to a net basis in accordance with the applicable accounting guidance. The other collateral consists of securities and is exchanged under bilateral collateral and master netting agreements that allow us to offset the net derivative position with the related collateral. The application of the other collateral cannot reduce the net derivative position below zero. Therefore, excess other collateral, if any, is not reflected above. Fair value hedges. During the nine months ended September 30, 2024, we did not exclude any portion of fair value hedging instruments from the assessment of hedge effectiveness. The following tables summarize the amounts that were recorded on the balance sheet as of September 30, 2024, and December 31, 2023, related to cumulative basis adjustments for fair value hedges. September 30, 2024 Dollars in millions Balance sheet line item in which the hedge item is included Carrying amount of hedged item (a) Hedge accounting basis adjustment (b) Interest rate contracts Long-term debt $ 10,500 $ (240) Interest rate contracts Securities Available for Sale (c) 12,286 (300) December 31, 2023 Balance sheet line item in which the hedge item is included Carrying amount of hedged item (a) Hedge accounting basis adjustment (b) Interest rate contracts Long-term debt $ 9,919 $ (437) Interest rate contracts Securities Available for Sale (c) 8,655 (152) (a) The carrying amount represents the portion of the asset or liability designated as the hedged item. (b) Basis adjustments related to de-designated hedged items that no longer qualify as fair value hedges reduced the hedge accounting basis adjustm en t by $5 million a nd $5 million at September 30, 2024, and December 31, 2023, respectively. (c) Certain amounts are designed as fair value hedges under the portfolio layer method. The carrying amount represents the amortized costs basis of the prepayable financial assets used to designate hedging relationships in which the hedged item is the l ast layer expected to be remaining at the end of the relationship. At September 30, 2024, and December 31, 2023, the amortized costs of the closed portfolios in these hedging relationships was $12.3 billion and $12.8 billion, respectively, of which $7.2 billion were designated in a portfolio layer hedging relationship for both period ends. At September 30, 2024, and December 31, 2023, the cumulative basis adjustments associated with these amounts totaled $195 million and $147 million, respectively. Cash flow hedges. During the nine-month period ended September 30, 2024, we did not exclude any portion of cash flow hedging instruments from the assessment of hedge effectiveness. Considering the interest rates, yield curves, and notional amounts as of September 30, 2024, we expect to reclassify an estimated $205 million of after-tax net losses on derivative instruments designated as cash flow hedges from AOCI to income during the next 12 months. In addition, we expect to reclassify approximately $17 million of net losses related to terminated cash flow hedges from AOCI to income during the next 12 months. These reclassified amounts could differ from actual amounts recognized due to changes in interest rates, hedge de-designations and the addition of other hedges subsequent to September 30, 2024. As of September 30, 2024, the maximum length of time over which we hedge forecasted transactions is 3.61 years. The following tables summarize the effect of fair value and cash flow hedge accounting on the income statement for the three- and nine-month periods ended September 30, 2024, and September 30, 2023. Location and amount of net gains (losses) recognized in income on fair value and cash flow hedging relationships Dollars in millions Interest expense – long-term debt Interest income – loans Interest Income - securities Investment banking and debt placement fees Three months ended September 30, 2024 Total amounts presented in the consolidated statement of income $ (292) $ 1,516 $ 298 $ 171 Net gains (losses) on fair value hedging relationships Interest contracts Recognized on hedged items $ (333) $ — $ 329 $ — Recognized on derivatives designated as hedging instruments 258 — (285) — Net income (expense) recognized on fair value hedges $ (75) $ — $ 44 $ — Net gain (loss) on cash flow hedging relationships Interest contracts Realized gains (losses) (pre-tax) reclassified from AOCI into net income $ — $ (184) $ — $ (3) Net income (expense) recognized on cash flow hedges $ — $ (184) $ — $ (3) Three months ended September 30, 2023 Total amounts presented in the consolidated statement of income $ (351) $ 1,593 $ 192 $ 141 Net gains (losses) on fair value hedging relationships Interest contracts Recognized on hedged items $ 3 $ — $ (54) $ — Recognized on derivatives designated as hedging instruments (54) — 63 — Net income (expense) recognized on fair value hedges $ (51) $ — $ 9 $ — Net gain (loss) on cash flow hedging relationships Interest contracts Realized gains (losses) (pre-tax) reclassified from AOCI into net income $ — $ (248) $ — $ 2 Net income (expense) recognized on cash flow hedges $ — $ (248) $ — $ 2 Location and amount of net gains (losses) recognized in income on fair value and cash flow hedging relationships Dollars in millions Interest expense – long-term debt Interest income – loans Interest Income - Securities Investment banking and debt placement fees Nine months ended September 30, 2024 Total amounts presented in the consolidated statement of income $ (952) $ 4,578 $ 789 $ 467 Net gains (losses) on fair value hedging relationships Interest contracts Recognized on hedged items $ (198) $ — $ 156 $ — Recognized on derivatives designated as hedging instruments (22) — (47) — Net income (expense) recognized on fair value hedges $ (220) $ — $ 109 $ — Net gain (loss) on cash flow hedging relationships Interest contracts Realized gains (losses) (pre-tax) reclassified from AOCI into net income $ (1) $ (599) $ — $ (2) Net income (expense) recognized on cash flow hedges $ (1) $ (599) $ — $ (2) Nine months ended September 30, 2023 Total amounts presented in the consolidated statement of income $ (975) $ 4,645 $ 580 $ 406 Net gains (losses) on fair value hedging relationships Interest contracts Recognized on hedged items $ 226 $ — $ (72) $ — Recognized on derivatives designated as hedging instruments (374) — 93 — Net income (expense) recognized on fair value hedges $ (148) $ — $ 21 $ — Net gain (loss) on cash flow hedging relationships Interest contracts Realized gains (losses) (pre-tax) reclassified from AOCI into net income $ (1) $ (708) $ — $ 3 Net income (expense) recognized on cash flow hedges $ (1) $ (708) $ — $ 3 The following tables summarize the pre-tax net gains (losses) on our cash flow hedges for the three- and nine-month periods ended September 30, 2024, and September 30, 2023, and where they are recorded on the income statement. The table includes net gains (losses) recognized in OCI during the period and net gains (losses) reclassified from OCI into income during the current period. Dollars in millions Net Gains (Losses) Recognized in OCI Income Statement Location of Net Gains (Losses) Reclassified From OCI Into Income Net Gains (Losses) Reclassified From OCI Into Income Three months ended September 30, 2024 Cash Flow Hedges Interest rate $ 410 Interest income — Loans $ (184) Interest rate — Interest expense — Long-term debt — Interest rate (5) Investment banking and debt placement fees (3) Total $ 405 $ (187) Three months ended September 30, 2023 Cash Flow Hedges Interest rate $ (228) Interest income — Loans $ (248) Interest rate 12 Interest expense — Long-term debt — Interest rate 5 Investment banking and debt placement fees 2 Total $ (211) $ (246) Dollars in millions Net Gains (Losses) Recognized in OCI Income Statement Location of Net Gains (Losses) Reclassified From OCI Into Income Net Gains (Losses) Reclassified From OCI Into Income (a) Nine months ended September 30, 2024 Cash Flow Hedges Interest rate $ 49 Interest income — Loans $ (599) Interest rate 1 Interest expense — Long-term debt (1) Interest rate (4) Investment banking and debt placement fees (2) Total $ 46 $ (602) Nine months ended September 30, 2023 Cash Flow Hedges Interest rate $ (584) Interest income — Loans $ (708) Interest rate 8 Interest expense — Long-term debt (1) Interest rate 5 Investment banking and debt placement fees 3 Total $ (571) $ (706) Nonhedging instruments The following table summarizes the pre-tax net gains (losses) on our derivatives that are not designated as hedging instruments for the three- and nine-month periods ended September 30, 2024, and September 30, 2023, and where they are recorded on the income statement. Three months ended September 30, 2024 Three months ended September 30, 2023 Dollars in millions Corporate services income Consumer mortgage income Other income Total Corporate services income Consumer mortgage income Other income Total NET GAINS (LOSSES) Interest rate $ 8 $ — $ 3 $ 11 $ 8 $ — $ 1 $ 9 Foreign exchange 13 — — 13 13 — — 13 Commodity 4 — — 4 5 — — 5 Credit — — (22) (22) — — (12) (12) Other — — 3 3 — 1 6 7 Total net gains (losses) $ 25 $ — $ (16) $ 9 $ 26 $ 1 $ (6) $ 22 Nine months ended September 30, 2024 Nine months ended September 30, 2023 Dollars in millions Corporate services income Consumer mortgage income Other income Total Corporate services income Consumer mortgage income Other income Total NET GAINS (LOSSES) Interest rate $ 27 $ — $ 4 $ 31 $ 33 $ — $ — $ 33 Foreign exchange 39 — — 39 39 — — 39 Commodity 9 — — 9 19 — — 19 Credit 1 — (36) (35) 2 — (43) (41) Other — 1 9 10 — 4 2 6 Total net gains (losses) $ 76 $ 1 $ (23) $ 54 $ 93 $ 4 $ (41) $ 56 Counterparty Credit Risk We hold collateral in the form of cas h and highly rated securities issued by the U.S. Treasury, government-sponsored enterprises, or GNMA . Cash collateral of $218 million was netted against derivative assets on the balance sheet at September 30, 2024, compared to $408 million of cash collateral netted against derivative assets at December 31, 2023. The cash collateral netted against derivative liabilities totaled $62 million at September 30, 2024, and $64 million at December 31, 2023. Our means of mitigating and managing exposure to credit risk on derivative contracts is described in Note 8 (“Derivatives and Hedging Activities”) beginning on page 142 of our 2023 Form 10-K under the heading “Counterparty Credit Risk.” The following table summarizes the fair value of our derivative assets by type at the dates indicated. These assets represent our net exposure to potential loss after taking into account the effects of bilateral collateral and master netting agreements and other means used to mitigate risk. Dollars in millions September 30, 2024 December 31, 2023 Interest rate $ 139 $ 123 Foreign exchange 22 42 Commodity 237 409 Credit — — Other 11 15 Derivative assets before collateral 409 589 Plus(Less): Related collateral (218) (408) Total derivative assets $ 191 $ 181 We enter into derivative transactions with two primary groups: broker-dealers and banks, and clients. Given that these groups have different economic characteristics, we have different methods for managing counterparty credit exposure and credit risk. We enter into transactions with broker-dealers and banks for various risk management purposes. These types of transactions are primarily high dollar volume. We enter into bilateral collateral and master netting agreements with these counterparties. We clear certain types of derivative transactions with these counterparties, whereby central clearing organizations become the counterparties to our derivative contracts. In addition, we enter into derivative contracts through swa p execution facilities. Swap clearing and swap execution facilities reduce our exposure to counterparty credit risk. At September 30, 2024, we had gross exposure of $474 million to broker-dealers and banks. We had net exposure of $30 million after the application of master netting agreements and cash collateral, where such qualifying agreements exist. We held no additional collateral in the form of securities against this net exposure. We enter into transactions using master netting agreements with clients to accommodate their business needs. In most cases, we mitigate our credit exposure by cross-collateralizing these transactions to the underlying loan collateral. We mitigate our market risk by buying and selling U.S. Treasuries and SOFR futures or entering into offsetting positions. Due to the cross-collateralization to the underlying loan, we typically do not exchange cash or marketable securities collateral in connection with these transactions. To address the risk of default associated with these contracts, we have established a CVA reserve (included in “accrued income and other assets”) in the amount of $7 million at September 30, 2024. The CVA is calculated from potential future exposures, expected recovery rates, and market-implied probabilities of default. At September 30, 2024, we had gross exposure of $192 million to client counterparties and other entities that are not broker-dealers or banks for derivatives that have associated master netting agreements. We had net exposure of $161 million o n our derivatives with these counterparties after the application of master netting agreements, collateral, an d the related reserve. Credit Derivatives We are a buyer and, under limited circumstances, may be a seller of credit protection through the credit derivative market. We purchase credit derivatives to manage the credit risk associated with specific commercial lending and swap obligations as well as exposures to debt securities. Our credit derivative portfolio was in a net liability position o f $2 million a s of September 30, 2024, and $1 million as of December 31, 2023. Our credit derivative portfolio consists of traded credit default swap indices and risk participation agreements. Additional descriptions of our credit derivatives are provided in Note 8 (“Derivatives and Hedging Activities”) beginning on page 142 of our 2023 Form 10-K under the heading “Credit Derivatives.” The following table provides information on the types of credit derivatives sold by us and held on the balance sheet at September 30, 2024, and December 31, 2023. The notional amount represents the amount that the seller could be required to pay. The payment/performance risk shown in the table represents a weighted average of the default probabilities for all reference entities in the respective portfolios. These default probabilities are implied from observed credit indices in the credit default swap market, which are mapped to reference entities based on Key’s internal risk rating. September 30, 2024 December 31, 2023 Dollars in millions Notional Average Term (Years) Payment / Performance Risk Notional Amount Average Term (Years) Payment / Performance Risk Other $ 12 5.24 2.07 % $ 4 10.69 4.86 % Total credit derivatives sold $ 12 — — $ 4 — — Credit Risk Contingent Features We have entered into certain derivative contracts that require us to post collateral to the counterparties when these contracts are in a net liability position. The amount of collateral to be posted is based on the amount of the net liability and thresholds generally related to our long-term senior unsecured credit ratings with Moody’s and S&P. Collateral requirements also are based on minimum transfer amounts, which are specific to each Credit Support Annex (a component of the ISDA Master Agreement) that we have signed with the counterparties. In a limited number of instances, counterparties have the right to terminate their ISDA Master Agreements with us if our ratings fall below a certain lev el, usually investment-grade level (i.e., “Baa3” for Moody’s and “BBB-” for S&P). At September 30, 2024, KeyBank’s rating was “Baa1” with Moody’s and “BBB+” with S&P, and KeyCorp’s rating was “Baa2” with Moody’s and “BBB” with S&P. Refer to the table below for the aggregate fair value of all derivative contracts with credit risk contingent features held by Key’s banking affiliate KeyBank that were in a net liability position. Dollars in millions September 30, 2024 December 31, 2023 Net derivative liabilities with credit-risk contingent features $ (27) $ (45) Collateral posted 26 42 As of September 30, 2024, and December 31, 2023, th e fair value of additional collateral that could be required to be posted as a result of the credit risk related contingent features being triggered was immaterial to Key’s consolidated financial statements. A

Mortgage Servicing Assets

Mortgage Servicing Assets	9 Months Ended
	Sep. 30, 2024
Servicing Asset [Abstract]
Mortgage Servicing Assets	8. Mortgage Servicing Assets We originate and periodically sell commercial and residential mortgage loans but continue to service those loans for the buyers. We also may purchase the right to service commercial mortgage loans from other lenders. We record a servicing asset if we purchase or retain the right to service loans in exchange for servicing fees that exceed the going market servicing rate and are considered more than adequate compensation for servicing. Additional information pertaining to the accounting for mortgage and other servicing assets is included in Note 1 (“Summary of Significant Accounting Policies”) under the heading “Servicing Assets” beginning on page 114 of our 2023 Form 10-K. Commercial Changes in the carrying amount of commercial mortgage servicing assets are summarized as follows: Three months ended September 30, Nine months ended September 30, Dollars in millions 2024 2023 2024 2023 Balance at beginning of period $ 612 $ 627 $ 638 $ 653 Servicing retained from loan sales 17 40 44 66 Purchases 7 8 17 18 Amortization (30) (30) (93) (92) Temporary (impairments) recoveries — — — — Balance at end of period $ 606 $ 645 $ 606 $ 645 Fair value at end of period $ 816 $ 871 $ 816 $ 871 The fair value of commercial mortgage servicing assets is determined by calculating the present value of future cash flows associated with servicing the loans. This calculation uses a number of assumptions that are based on current market conditions. The range and weighted average of the significant unobservable inputs used to determine the fair value of our commercial mortgage servicing assets at September 30, 2024, and September 30, 2023, along with the valuation techniques, are shown in the following table: September 30, 2024 September 30, 2023 Valuation Technique Significant Unobservable Input Range Weighted Average Range Weighted Average Discounted cash flow Expected defaults 1.00 % 2.00 % 1.01 % 1.00 % 2.00 % 1.01 % Residual cash flows discount rate 7.17 % 10.72 % 10.38 % 7.44 % 10.50 % 10.13 % Escrow earn rate 4.51 % 4.56 % 4.51 % 5.48 % 5.61 % 5.49 % Loan assumption rate — % 2.36 % 1.99 % — % 2.13 % 1.96 % If these economic assumptions change or prove incorrect, the fair value of commercial mortgage servicing assets may also change. Expected credit losses, escrow earning rates, and discount rates are critical to the valuation of commercial mortgage servicing assets. Estimates of these assumptions are based on how a market participant would view the respective rates, and reflect historical data associated with the commercial mortgage loans, industry trends, and other considerations. Actual rates may differ from those estimated due to changes in a variety of economic factors. A decrease in the value assigned to the escrow earning rates would cause a decrease in the fair value of our commercial mortgage servicing assets. An increase in the assumed default rates of commercial mortgage loans or an increase in the assigned discount rates would cause a decrease in the fair value of our commercial mortgage servicing assets. Prepayment activity on commercial serviced loans does not significantly affect the valuation of our commercial mortgage servicing assets. Unlike residential mortgages, commercial mortgages experience significantly lower prepayments due to certain contractual restrictions affecting the borrower’s ability to prepay the mortgage. The amortization of commercial servicing assets is determined in proportion to, and over the period of, the estimated net servicing income. The amortization of commercial servicing assets for each period, as shown in the table at the beginning of this note, is recorded as a reduction to contractual fee income. The contractual fee income from servicing commercial mortgage loans totaled $284 million for the nine-month period ended September 30, 2024, and $234 million for the nine-month period ended September 30, 2023. This fee income was offset by $93 million of amortization for the nine-month period ended September 30, 2024, and $92 million for the nine-month period ended September 30, 2023. Both the contractual fee income and the amortization are recorded, net, in “commercial mortgage servicing fees” on the income statement. Residential Changes in the carrying amount of residential mortgage servicing assets are summarized as follows: Three months ended September 30, Nine months ended September 30, Dollars in millions 2024 2023 2024 2023 Balance at beginning of period $ 109 $ 106 $ 108 $ 106 Servicing retained from loan sales 4 4 9 8 Purchases — — — — Amortization (3) (3) (8) (7) Temporary (impairments) recoveries (2) — (1) — Balance at end of period $ 108 $ 107 $ 108 $ 107 Fair value at end of period $ 129 $ 137 $ 129 $ 137 The fair value of mortgage servicing assets is determined by calculating the present value of future cash flows associated with servicing the loans. This calculation uses a number of assumptions that are based on current market conditions. The range and weighted-average of the significant unobservable inputs used to fair value our mortgage servicing assets at September 30, 2024, and September 30, 2023, along with the valuation techniques, are shown in the following table: September 30, 2024 September 30, 2023 Valuation Technique Significant Unobservable Input Range Weighted Average Range Weighted Average Discounted cash flow Prepayment speed 7.08 % 53.34 % 8.33 % 5.24 % 36.95 % 6.87 % Discount rate 6.50 % 8.75 % 6.60 % 6.50 % 8.75 % 6.59 % Servicing cost $ 70.00 $ 3,582 $ 75.25 $ 70.00 $ 4,332 $ 74.70 If these economic assumptions change or prove incorrect, the fair value of residential mortgage servicing assets may also change. Prepayment speed, discount rates, and servicing cost are critical to the valuation of residential mortgage servicing assets. Estimates of these assumptions are based on how a market participant would view the respective rates and reflect historical data associated with the residential mortgage loans, industry trends, and other considerations. Actual rates may differ from those estimated due to changes in a variety of economic factors. An increase in the prepayment speed would cause a decrease in the fair value of our residential mortgage servicing assets. An increase in the assigned discount rates and servicing cost assumptions would cause a decrease in the fair value of our residential mortgage servicing assets. The amortization of residential servicing assets for September 30, 2024, as shown in the table above, is recorded as a reduction to contractual fee income. The contractual fee income from servicing residential mortgage loans totaled $29 million for the nine-month period ended September 30, 2024, and $25 million for the nine-month period ended September 30, 2023. This fee income was offset by $8 million of amortization for the nine-month period ended September 30, 2024, and $7 million for the nine-month period ended September 30, 2023. Both the contractual fee income and the amortization are recorded, net, in “consumer mortgage income” on the income statement.

Leases

Leases	9 Months Ended
	Sep. 30, 2024
Leases [Abstract]
Leases	9. Leases As a lessee, we enter into leases of land, buildings, and equipment. Our real estate leases primarily relate to bank branches and office space. The leases of equipment principally relate to technology assets for data processing and data storage. As a lessor, we primarily provide financing through our equipment leasing business. For more information on our leasing activity, see Note 10 (“Leases”) beginning on page 150 of our 2023 Form 10-K. Lessor Equipment Leasing Leases may have fixed or floating rate terms. Variable payments are based on an index or other specified rate and are included in rental payments. Certain leases contain an option to extend the lease term or the option to terminate at the discretion of the lessee. Under certain conditions, lease agreements may also contain the option for a lessee to purchase the underlying asset. Interest income from sales-type and direct financing leases is recognized in "interest income — loans" on the income statement. Income related to operating leases is recognized in “operating lease income and other leasing gains” on the income statement. The components of equipment leasing income are summarized in the table below: Three months ended September 30, Nine months ended September 30, Dollars in millions 2024 2023 2024 2023 Sales-type and direct financing leases Interest income on lease receivable $ 17 $ 19 $ 53 $ 58 Interest income related to accretion of unguaranteed residual asset 2 3 7 10 Interest income on deferred fees and costs 5 2 15 2 Total sales-type and direct financing lease income $ 24 $ 24 $ 75 $ 70 Operating leases Operating lease income related to lease payments $ 16 $ 19 $ 53 $ 65 Other operating leasing gains — 3 8 5 Total operating lease income and other leasing gains 16 22 61 70 Total lease income $ 40 $ 46 $ 136 $ 140
Leases	9. Leases As a lessee, we enter into leases of land, buildings, and equipment. Our real estate leases primarily relate to bank branches and office space. The leases of equipment principally relate to technology assets for data processing and data storage. As a lessor, we primarily provide financing through our equipment leasing business. For more information on our leasing activity, see Note 10 (“Leases”) beginning on page 150 of our 2023 Form 10-K. Lessor Equipment Leasing Leases may have fixed or floating rate terms. Variable payments are based on an index or other specified rate and are included in rental payments. Certain leases contain an option to extend the lease term or the option to terminate at the discretion of the lessee. Under certain conditions, lease agreements may also contain the option for a lessee to purchase the underlying asset. Interest income from sales-type and direct financing leases is recognized in "interest income — loans" on the income statement. Income related to operating leases is recognized in “operating lease income and other leasing gains” on the income statement. The components of equipment leasing income are summarized in the table below: Three months ended September 30, Nine months ended September 30, Dollars in millions 2024 2023 2024 2023 Sales-type and direct financing leases Interest income on lease receivable $ 17 $ 19 $ 53 $ 58 Interest income related to accretion of unguaranteed residual asset 2 3 7 10 Interest income on deferred fees and costs 5 2 15 2 Total sales-type and direct financing lease income $ 24 $ 24 $ 75 $ 70 Operating leases Operating lease income related to lease payments $ 16 $ 19 $ 53 $ 65 Other operating leasing gains — 3 8 5 Total operating lease income and other leasing gains 16 22 61 70 Total lease income $ 40 $ 46 $ 136 $ 140
Leases	9. Leases As a lessee, we enter into leases of land, buildings, and equipment. Our real estate leases primarily relate to bank branches and office space. The leases of equipment principally relate to technology assets for data processing and data storage. As a lessor, we primarily provide financing through our equipment leasing business. For more information on our leasing activity, see Note 10 (“Leases”) beginning on page 150 of our 2023 Form 10-K. Lessor Equipment Leasing Leases may have fixed or floating rate terms. Variable payments are based on an index or other specified rate and are included in rental payments. Certain leases contain an option to extend the lease term or the option to terminate at the discretion of the lessee. Under certain conditions, lease agreements may also contain the option for a lessee to purchase the underlying asset. Interest income from sales-type and direct financing leases is recognized in "interest income — loans" on the income statement. Income related to operating leases is recognized in “operating lease income and other leasing gains” on the income statement. The components of equipment leasing income are summarized in the table below: Three months ended September 30, Nine months ended September 30, Dollars in millions 2024 2023 2024 2023 Sales-type and direct financing leases Interest income on lease receivable $ 17 $ 19 $ 53 $ 58 Interest income related to accretion of unguaranteed residual asset 2 3 7 10 Interest income on deferred fees and costs 5 2 15 2 Total sales-type and direct financing lease income $ 24 $ 24 $ 75 $ 70 Operating leases Operating lease income related to lease payments $ 16 $ 19 $ 53 $ 65 Other operating leasing gains — 3 8 5 Total operating lease income and other leasing gains 16 22 61 70 Total lease income $ 40 $ 46 $ 136 $ 140
Leases	9. Leases As a lessee, we enter into leases of land, buildings, and equipment. Our real estate leases primarily relate to bank branches and office space. The leases of equipment principally relate to technology assets for data processing and data storage. As a lessor, we primarily provide financing through our equipment leasing business. For more information on our leasing activity, see Note 10 (“Leases”) beginning on page 150 of our 2023 Form 10-K. Lessor Equipment Leasing Leases may have fixed or floating rate terms. Variable payments are based on an index or other specified rate and are included in rental payments. Certain leases contain an option to extend the lease term or the option to terminate at the discretion of the lessee. Under certain conditions, lease agreements may also contain the option for a lessee to purchase the underlying asset. Interest income from sales-type and direct financing leases is recognized in "interest income — loans" on the income statement. Income related to operating leases is recognized in “operating lease income and other leasing gains” on the income statement. The components of equipment leasing income are summarized in the table below: Three months ended September 30, Nine months ended September 30, Dollars in millions 2024 2023 2024 2023 Sales-type and direct financing leases Interest income on lease receivable $ 17 $ 19 $ 53 $ 58 Interest income related to accretion of unguaranteed residual asset 2 3 7 10 Interest income on deferred fees and costs 5 2 15 2 Total sales-type and direct financing lease income $ 24 $ 24 $ 75 $ 70 Operating leases Operating lease income related to lease payments $ 16 $ 19 $ 53 $ 65 Other operating leasing gains — 3 8 5 Total operating lease income and other leasing gains 16 22 61 70 Total lease income $ 40 $ 46 $ 136 $ 140
Leases	9. Leases As a lessee, we enter into leases of land, buildings, and equipment. Our real estate leases primarily relate to bank branches and office space. The leases of equipment principally relate to technology assets for data processing and data storage. As a lessor, we primarily provide financing through our equipment leasing business. For more information on our leasing activity, see Note 10 (“Leases”) beginning on page 150 of our 2023 Form 10-K. Lessor Equipment Leasing Leases may have fixed or floating rate terms. Variable payments are based on an index or other specified rate and are included in rental payments. Certain leases contain an option to extend the lease term or the option to terminate at the discretion of the lessee. Under certain conditions, lease agreements may also contain the option for a lessee to purchase the underlying asset. Interest income from sales-type and direct financing leases is recognized in "interest income — loans" on the income statement. Income related to operating leases is recognized in “operating lease income and other leasing gains” on the income statement. The components of equipment leasing income are summarized in the table below: Three months ended September 30, Nine months ended September 30, Dollars in millions 2024 2023 2024 2023 Sales-type and direct financing leases Interest income on lease receivable $ 17 $ 19 $ 53 $ 58 Interest income related to accretion of unguaranteed residual asset 2 3 7 10 Interest income on deferred fees and costs 5 2 15 2 Total sales-type and direct financing lease income $ 24 $ 24 $ 75 $ 70 Operating leases Operating lease income related to lease payments $ 16 $ 19 $ 53 $ 65 Other operating leasing gains — 3 8 5 Total operating lease income and other leasing gains 16 22 61 70 Total lease income $ 40 $ 46 $ 136 $ 140

Goodwill

Goodwill	9 Months Ended
	Sep. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	10. Goodwill Our annual goodwill impairment testing is performed as of October 1 each year, or more frequently as events occur or circumstances change that would more-likely-than-not reduce the fair value of a reporting unit below its carrying amount. A quantitative or qualitative testing approach may be used. Additional information pertaining to our accounting policy for goodwill and other intangible assets is summarized in Note 1 (“Summary of Significant Accounting Policies”) under the heading “Goodwill and Other Intangible Assets” beginning on page 114 of our 2023 Form 10-K. During the first quarter of 2024, Key realigned its real estate capital business from its Commercial Bank reporting unit to its Institutional Bank reporting unit. The move was done to align product-based teams to the client-facing businesses they serve with the goal of reducing overhead and complexity and creating a better client experience. This reorganization was identified as a triggering event. As a result, interim quantitative goodwill impairment tests were performed during the first quarter of 2024 reflecting the reporting units both immediately before and immediately after the realignment, neither of which resulted in impairment. The results of the impairment test reflecting the realignment indicated the fair value of each of the three reporting units, Consumer Bank, Commercial Bank, and Institutional Bank, exceeded their respective carrying values by more than 10%. We monitored events and circumstances through September 30, 2024, including macroeconomic factors, industry and banking sector events, Key specific performance indicators, and the sensitivity of the interim quantitative test results to changes in assumptions through September 30, 2024. At the conclusion of this assessment of all reporting units, we determined that as of September 30, 2024, it was more likely than not that the fair value of all reporting units exceeded the respective carrying value of such reporting units. The reporting units at which goodwill is tested for impairment are the Consumer Bank, Commercial Bank and Institutional Bank reporting units. As the Commercial Bank and Institutional Bank reporting units are aggregated within Key’s overall Commercial Bank reporting segment, the realignment of real estate capital did not have an impact on our reportable segments, however, goodwill was reallocated from the Commercial Bank reporting unit to the Institutional Bank reporting unit. During the first quarter of 2024, the Commercial Bank and Institutional Bank reporting units were allocated goodwill of $218 million and $715 million, respectively. There were no changes to goodwill balances in the third quarter of 2024. The carrying amount of goodwill by reporting segment is presented in the following table: Dollars in millions Consumer Bank Commercial Bank Total BALANCE AT SEPTEMBER 30, 2023 $ 1,819 $ 933 $ 2,752 BALANCE AT DECEMBER 31, 2023 $ 1,819 $ 933 $ 2,752 BALANCE AT SEPTEMBER 30, 2024 $ 1,819 $ 933 $ 2,752

Variable Interest Entities

Variable Interest Entities	9 Months Ended
	Sep. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Variable Interest Entities	11. Variable Interest Entities Our significant VIEs are summarized below. Additional information pertaining to the criteria used in determining if an entity is a VIE is included in Note 13 (“Variable Interest Entities”) beginning on page 154 of our 2023 Form 10-K. LIHTC and NMTC investments. We had $2.2 billion and $2.3 billion of investments in LIHTC operating partnerships at September 30, 2024, and December 31, 2023, respectively. These investments are recorded in “accrued income and other assets” on our Consolidated Balance Sheets. We do not have any loss reserves recorded related to these investments because we believe the likelihood of any loss to be remote. For all legally binding, unfunded equity commitments, we increase our recognized investment and recognize a liability. As of September 30, 2024, and December 31, 2023, we had liabilities of $1.1 billion and $1.4 billion, respectively, related to investments in qualified affordable housing projects, which are recorded in “accrued expenses and other liabilities” on our Consolidated Balance Sheets. We continue to invest in these LIHTC operating partnerships. The assets and liabilities presented in the table below convey the size of KCDC’s direct and indirect investments at September 30, 2024, and December 31, 2023. As these investments represent unconsolidated VIEs, the assets and liabilities of the investments themselves are not recorded on our Consolidated Balance Sheets. Additional information pertaining to our LIHTC investments is included in Note 13 (“Variable Interest Entities”) beginning on page 154 of our 2023 Form 10-K. Unconsolidated VIEs Dollars in millions Total Assets Total Liabilities Maximum Exposure to Loss September 30, 2024 LIHTC investments $ 10,008 $ 4,579 $ 2,674 December 31, 2023 LIHTC investments $ 8,904 $ 3,848 $ 2,768 We had $29 million and $25 million in NMTC investments at September 30, 2024 and December 31, 2023, respectively. These investments are recorded in “accrued income and other assets” on our Consolidated Balance Sheets . We amortize our LIHTC and NMTC investments over the period that we expect to receive the tax benefits. During the nine months ended September 30, 2024, we recognized $171 million of amortization, $166 million of tax credits and $41 million of other tax benefits associated with these investments within “income taxes” on our income statement. During the nine months ended September 30, 2023, we recognized $163 million of amortization, $151 million of tax credits and $39 million of other tax benefits associated with these investments within “income taxes” on our income statement. Principal investments. Our maximum exposure to loss associated with indirect principal investments consists of the investments’ fair value plus any unfunded equity commitments. The fair value of our indirect principal investments totaled $16 million and $17 million at September 30, 2024 and December 31, 2023, respectively. These investments are recorded in “other investments” on our Consolidated Balance Sheets. The table below reflects the size of the private equity funds in which we were invested as well as our maximum exposure to loss in connection with these investments at September 30, 2024, and December 31, 2023. Unconsolidated VIEs Dollars in millions Total Assets Total Liabilities Maximum Exposure to Loss September 30, 2024 Indirect investments $ 2,372 $ 3 $ 17 December 31, 2023 Indirect investments $ 2,741 $ 91 $ 18 Through our principal investing entities, we have formed and funded operating entities that provide management and other related services to our investment company funds, which directly invest in portfolio companies. These entities had no assets at September 30, 2024, and December 31, 2023, that can be used to settle the entities’ obligations. The entities had no liabilities at September 30, 2024, and December 31, 2023, and other equity investors have no recourse to our general credit. Additional information on our indirect and direct principal investments is provided in Note 6 (“Fair Value Measurements”) beginning on page 130 and in Note 13 (“Variable Interest Entities “) beginning on page 154 of our 2023 Form 10-K. Other unconsolidated VIEs. We are involved with other various entities in the normal course of business which we have determined to be VIEs. We have determined that we are not the primary beneficiary of these VIEs because we do not have the power to direct the activities that most significantly impact their economic performance or hold a variable interest that could potentially be significant. The table below shows our assets and liabilities associated with these unconsolidated VIEs at September 30, 2024, and December 31, 2023. These assets are recorded in “accrued income and other assets,” “other investments,” “securities available for sale,” “held-to-maturity securities,” and “loans, net of unearned income” on our Consolidated Balance Sheets. Of the total balance as of September 30, 2024, $388 million related to the purchase of senior notes from a securitization collateralized by sold indirect auto loans. Additional information pertaining to our other unconsolidated VIEs is included in Note 13 (“Variable Interest Entities“) under the heading “Other unconsolidated VIEs” on page 156 of our 2023 Form 10-K. Other unconsolidated VIEs Dollars in millions Total Assets Total Liabilities September 30, 2024 Other unconsolidated VIEs $ 818 $ 1 December 31, 2023 Other unconsolidated VIEs $ 1,149 $ 1

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2024
Income Tax Disclosure [Abstract]
Income Taxes	12. Income Taxes Income Tax Provision In accordance with the applicable accounting guidance, the principal method established for computing the provision for income taxes in interim periods requires us to make our best estimate of the effective tax rate expected to be applicable for the full year. This estimated effective tax rate is then applied to interim consolidated pre-tax operating income to determine the interim provision for income taxes. The effective tax rate, which is the provision for income taxes as a percentage of income before income taxes, was 18.8% for the third quarter of 2024 and 17.8% for the third quarter of 2023. The effective tax rates were less than our combined federal and state statutory tax rate of 23.9%, primarily due to income from investments in tax-advantaged assets such as corporate-owned life insurance and tax credits associated with low-income housing investments. Deferred Taxes At September 30, 2024, we had a net deferred tax asset of $1.4 billion, compared to a net deferred tax asset of $1.8 billion at December 31, 2023, which are included in “accrued income and other assets” on the balance sheet. The deferred tax asset is primarily related to market fluctuations in the investment security portfolio accounted for in other comprehensive income. To determine the amount of deferred tax assets that are more likely than not to be realized, and therefore recorded, we conduct a quarterly assessment of all available evidence. This evidence includes, but is not limited to, taxable income in prior periods, projected future taxable income, and projected future reversals of deferred tax items. These assessments involve a degree of subjectivity and may undergo change. Based on these criteria, we had a valuation allowance of $15 million at September 30, 2024, and $12 million at December 31, 2023. The valuation allowance is associated with federal and state capital loss carryforwards. Unrecognized Tax Benefits At September 30, 2024, Key’s unrecognized tax benefits were $46 million. As permitted under the applicable accounting guidance for income taxes, it is our policy to recognize interest and penalties related to unrecognized tax benefits in “income tax expense.” Pre-1988 Bank Reserves Acquired in a Business Combination Retained earnings of KeyBank included approximately $92 million of allocated bad debt deductions for which no income taxes have been recorded. Under current federal law, these reserves are subject to recapture into taxable income if KeyBank, or any successor, fails to maintain its bank status under the Internal Revenue Code or makes non-dividend distributions or distributions greater than its accumulated earnings and profits. No deferred tax liability has been established as these events are not expected to occur in the foreseeable future.

Discontinued Operations

Discontinued Operations	9 Months Ended
	Sep. 30, 2024
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations	13. Discontinued Operations Discontinued operations primarily includes our government-guaranteed and private education lending business. At September 30, 2024, and December 31, 2023, approximately $272 million and $339 million, respectively, of education loans are included in discontinued assets on the Consolidated Balance Sheets. Net interest income after provision for credit losses for this business is not material and is included in income (loss) from discontinued operations, net of taxes on the Consolidated Statements of Income.

Securities Financing Activities

Securities Financing Activities	9 Months Ended
	Sep. 30, 2024
Banking and Thrift, Other Disclosure [Abstract]
Securities Financing Activities	14. Securities Financing Activities Additional information regarding our securities financing activities, including risk management activities, is provided in Note 1 (“Summary of Significant Accounting Policies”) beginning on page 107 of our 2023 Form 10-K and Note 16 (“Securities Financing Activities”) beginning on page 159 of our 2023 Form 10-K. The following table summarizes our securities financing agreements at September 30, 2024, and December 31, 2023: September 30, 2024 December 31, 2023 Dollars in millions Gross Amount Presented in Balance Sheet Netting Adjustments (a) Collateral (b) Net Amounts Gross Amount Presented in Balance Sheet Netting Adjustments (a) Collateral (b) Net Amounts Offsetting of financial assets: Reverse repurchase agreements $ 3 $ (3) $ — $ — $ 7 $ (7) $ — $ — Securities borrowed — — — — — — — — Total $ 3 $ (3) $ — $ — $ 7 $ (7) $ — $ — Offsetting of financial liabilities: Repurchase agreements (c) $ 44 $ (3) $ (41) $ — $ 38 $ (7) $ (31) $ — Total $ 44 $ (3) $ (41) $ — $ 38 $ (7) $ (31) $ — (a) Netting adjustments take into account the impact of master netting agreements that allow us to settle with a single counterparty on a net basis. (b) These adjustments take into account the impact of bilateral collateral agreements that allow us to offset the net positions with the related collateral. The application of collateral cannot reduce the net position below zero. Therefore, excess collateral, if any, is not reflected above. (c) Repurchase agreements are collateralized by mortgage-backed securities and U.S. Treasuries and are contracted on an overnight or continuous basis. As of September 30, 2024, assets pledged as collateral against repurchase agreements totaled $44 million. Assets pledged as collateral are reported in “securities available for sale” and “held-to-maturity securities” on the Consolidated Balance Sheets. At September 30, 2024, the liabilities associated with collateral pledged were solely comprised of customer sweep financing activity and had a carrying value of $41 million. The collateral pledged under customer sweep repurchase agreements is posted to a third-party custodian and cannot be sold or repledged by the secured party. The risk related to a decline in the market value of collateral pledged is minimal given the collateral's high credit quality and the overnight duration of the repurchase agreements.

Employee Benefits

Employee Benefits	9 Months Ended
	Sep. 30, 2024
Retirement Benefits [Abstract]
Employee Benefits	15. Employee Benefits Pension Plans The components of net pension cost (benefit) for all funded and unfunded plans are recorded in Other expense and are summarized in the following table. For more information on our Pension Plans and Other Postretirement Benefit Plans, see Note 18 (“Employee Benefits”) beginning on page 162 of our 2023 Form 10-K. Three months ended September 30, Nine months ended September 30, Dollars in millions 2024 2023 2024 2023 Interest cost on PBO $ 10 $ 11 $ 30 $ 33 Expected return on plan assets (10) (11) (29) (32) Amortization of losses 3 3 8 8 Settlement loss — — — — Net pension cost $ 3 $ 3 $ 9 $ 9

Trust Preferred Securities Issu

Trust Preferred Securities Issued by Unconsolidated Subsidiaries	9 Months Ended
	Sep. 30, 2024
Banking and Thrift, Other Disclosure [Abstract]
Trust Preferred Securities Issued by Unconsolidated Subsidiaries	16. Trust Preferred Securities Issued by Unconsolidated Subsidiaries We own the outstanding common stock of business trusts formed by us that issued corporation-obligated, mandatorily redeemable, trust preferred securities. The trusts used the proceeds from the issuance of their trust preferred securities and common stock to buy debentures issued by KeyCorp. These debentures are the trusts’ only assets; the interest payments from the debentures finance the distributions paid on the mandatorily redeemable trust preferred securities. The outstanding common stock of these business trusts is recorded in Other investments on the Consolidated Balance Sheets. We unconditionally guarantee the following payments or distributions on behalf of the trusts: • required distributions on the trust preferred securities; • the redemption price when a capital security is redeemed; and • the amounts due if a trust is liquidated or terminated. The Regulatory Capital Rules require us to treat our mandatorily redeemable trust preferred securities as Tier 2 capital. The trust preferred securities, common stock, and related debentures are summarized as follows: Dollars in millions Trust Preferred Securities, Net of Discount (a) Common Stock Principal Amount of Debentures, Net of Discount (b) Interest Rate of Trust Preferred Securities and Debentures (c) Maturity of Trust Preferred Securities and Debentures September 30, 2024 KeyCorp Capital I $ 156 $ 6 $ 162 6.333 % 2028 KeyCorp Capital II 87 4 91 6.875 2029 KeyCorp Capital III 113 4 117 7.750 2029 HNC Statutory Trust III 21 1 22 6.763 2035 HNC Statutory Trust IV 21 1 22 6.518 2037 Willow Grove Statutory Trust I 18 1 19 6.797 2036 Westbank Capital Trust II 8 — 8 7.265 2034 Westbank Capital Trust III 8 — 8 7.265 2034 Total $ 432 $ 17 $ 449 6.898 % — December 31, 2023 $ 431 $ 17 $ 448 6.981 % — (a) The trust preferred securities must be redeemed when the related debentures mature, or earlier if provided in the governing indenture. Each issue of trust preferred securities carries an interest rate identical to that of the related debenture. Certain trust preferred securities include basis adjustments related to fair value hedges totaling $20 million and $15 million at September 30, 2024, and December 31, 2023, respectively. See Note 7 (“Derivatives and Hedging Activities”) for an explanation of fair value hedges. (b) We have the right to redeem these debentures. If the debentures purchased by KeyCorp Capital I, HNC Statutory Trust III, Willow Grove Statutory Trust I, HNC Statutory Trust IV, Westbank Capital Trust II, or Westbank Capital Trust III are redeemed before they mature, the redemption price will be the principal amount, plus any accrued but unpaid interest. If the debentures purchased by KeyCorp Capital II or KeyCorp Capital III are redeemed before they mature, the redemption price will be the greater of: (i) the principal amount, plus any accrued but unpaid interest, or (ii) the sum of the present values of principal and interest payments discounted at the Treasury Rate (as defined in the applicable indenture), plus 20 basis points for KeyCorp Capital II or 25 basis points for KeyCorp Capital III, or 50 basis points in the case of redemption upon either a tax or a capital treatment event for either KeyCorp Capital II or KeyCorp Capital III, plus any accrued but unpaid interest. (c) The interest rates for the trust preferred securities issued by KeyCorp Capital II and KeyCorp Capital III are fixed. The trust preferred securities issued by KeyCorp Capital I, HNC Statutory Trust III, HNC Statutory Trust IV, Willow Grove Statutory Trust I, Westbank Capital Trust II, and Westbank Capital Trust III have a floating interest rate, based on three-month CME term SOFR plus 26.161 basis points, that reprices quarterly. The total interest rates are weighted-average rates.

Contingent Liabilities and Guar

Contingent Liabilities and Guarantees	9 Months Ended
	Sep. 30, 2024
Commitments and Contingencies Disclosure [Abstract]
Contingent Liabilities and Guarantees	17. Contingent Liabilities and Guarantees Legal Proceedings Litigation. From time to time, in the ordinary course of business, we and our subsidiaries are subject to various litigation, investigations, and administrative proceedings. Private, civil litigation may range from individual actions involving a single plaintiff to putative class action lawsuits with potentially thousands of class members. Investigations may involve both formal and informal proceedings, by both government agencies and self-regulatory bodies. These matters may involve claims for substantial monetary relief. At times, these matters may present novel claims or legal theories. Due to the complex nature of these various other matters, it may be years before some matters are resolved. While it is impossible to ascertain the ultimate resolution or range of financial liability, based on information presently known to us, we do not believe there is any matter to which we are a party, or involving any of our properties that, individually or in the aggregate, would reasonably be expected to have a material adverse effect on our financial condition. We continually monitor and reassess the potential materiality of these litigation matters. We note, however, that in light of the inherent uncertainty in legal proceedings there can be no assurance that the ultimate resolution will not exceed established reserves. As a result, the outcome of a particular matter, or a combination of matters, may be material to our results of operations for a particular period, depending upon the size of the loss or our income for that particular period. Oren-Pines v. KeyBank. On October 4, 2024, the parties reached a settlement in principle, agreeing to resolve all claims (including all matters related thereto) brought in New York state court against KeyBank by Yaron Oren-Pines d/b/a In Common. These claims related to a KeyBank customer’s request for a wire transfer recall. The settlement amount to be paid by KeyBank is not material to our results of operations or financial condition. Guarantees We are a guarantor in various agreements with third parties. The following table shows the types of guarantees that we had outstanding at September 30, 2024. Information pertaining to the basis for determining the liabilities recorded in connection with these guarantees is included in Note 1 (“Summary of Significant Accounting Policies”) under the heading “Contingencies and Guarantees” beginning on page 115 of our 2023 Form 10-K. September 30, 2024 Maximum Potential Undiscounted Future Payments Liability Recorded Dollars in millions Financial guarantees: Standby letters of credit $ 4,234 $ 77 Recourse agreement with FNMA 7,743 63 Residential mortgage reserve 3,385 8 Written put options (a) 2,315 104 Total $ 17,677 $ 252 (a) The maximum potential undiscounted future payments represent notional amounts of derivatives qualifying as guarantees. We determine the payment/performance risk associated with each type of guarantee described below based on the probability that we could be required to make the maximum potential undiscounted future payments shown in the preceding table. We use a scale of low (0% to 30% probability of payment), moderate (greater than 30% to 70% probability of payment), or high (greater than 70% probability of payment) to assess the payment/performance risk, and have determined that the payment/performance risk associated with each type of guarantee outstanding at September 30, 2024, is low. Information pertaining to the nature of each of the guarantees listed below is included in Note 22 (“Commitments, Contingent Liabilities, and Guarantees”) under the heading “Guarantees” beginning on page 172 of our 2023 Form 10-K. Standby letters of credit. At September 30, 2024, our standby letters of credit had a remaining weighted-average life of 1.4 years, with remaining actual lives ranging from less than 1 year to 10.2 years. Recourse agreement with FNMA. At September 30, 2024, the outstanding commercial mortgage loans in this program had a weighted-average remaining term of 6.4 years, and the unpaid principal balance outstanding of loans sold by us as a participant was $24.7 billion. The maximum potential amount of undiscounted future payments that we could be required to make under this program, as shown in the preceding table, is equal to approximately 31.3% of the principal balance of loans outstanding at September 30, 2024. FNMA delegates responsibility for originating, underwriting, and servicing mortgages, and we assume a limited portion of the risk of loss during the remaining term on each commercial mortgage loan that we sell to FNMA. We maintain a reserve for such potential losses of $63 million that we believe approximates the fair value of our liability for the guarantee as described in Note 4 (“Asset Quality”). Residential Mortgage Banking. At September 30, 2024, the unpaid principal balance outstanding of loans sold by us in this program was $11.3 billion. The maximum potential amount of undiscounted future payments that we could be required to make under this program, as shown in the preceding table, is equal to approximately 30% of the principal balance of loans outstanding at September 30, 2024. Our liability for estimated repurchase obligations on loans sold, which is included in “accrued expenses and other liabilities” on the Consolidated Balance Sheets, was $8 million at September 30, 2024. For more information on our residential mortgages, see Note 8 (“Mortgage Servicing Assets”). Written put options. In the ordinary course of business, we “write” put options for clients that wish to mitigate their exposure to changes in interest rates and commodity prices. At September 30, 2024, our written put options had an average life of 1.1 years. These written put options are accounted for as derivatives at fair value, as further discussed in Note 7 (“Derivatives and Hedging Activities”). Written put options where the counterparty is a broker-dealer or bank are accounted for as derivatives at fair value but are not considered guarantees since these counterparties typically do not hold the underlying instruments. In addition, we are a purchaser and seller of credit derivatives, which are further discussed in Note 7 (“Derivatives and Hedging Activities”). Other Off-Balance Sheet Risk Other off-balance sheet risk stems from financial instruments that do not meet the definition of a guarantee as specified in the applicable accounting guidance, and from other relationships. Additional information pertaining to types of other off-balance sheet risk is included in Note 22 (“Commitments, Contingent Liabilities, and Guarantees”) under the heading “Other Off-Balance Sheet Risk” on page 174 of our 2023 Form 10-K.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	9 Months Ended
	Sep. 30, 2024
Equity [Abstract]
Accumulated Other Comprehensive Income	18. Accumulated Other Comprehensive Income Our changes in AOCI for the three and nine months ended September 30, 2024, and September 30, 2023, are as follows: Dollars in millions Unrealized gains (losses) on securities available for sale Unrealized gains (losses) on derivative financial instruments Net pension and postretirement benefit costs Total Balance at December 31, 2023 $ (4,190) $ (763) $ (276) $ (5,229) Other comprehensive income before reclassification, net of income taxes 850 (85) — 765 Amounts reclassified from AOCI, net of income taxes (a) 721 458 4 1,183 Net current-period other comprehensive income, net of income taxes 1,571 373 4 1,948 Balance at September 30, 2024 $ (2,619) $ (390) $ (272) $ (3,281) Balance at June 30, 2024 $ (4,282) $ (589) $ (273) $ (5,144) Other comprehensive income before reclassification, net of income taxes 951 57 (1) 1,007 Amounts reclassified from AOCI, net of income taxes (a) 712 142 2 856 Net current-period other comprehensive income, net of income taxes 1,663 199 1 1,863 Balance at September 30, 2024 $ (2,619) $ (390) $ (272) $ (3,281) Balance at December 31, 2022 $ (4,895) $ (1,124) $ (276) $ (6,295) Other comprehensive income before reclassification, net of income taxes (509) (376) — (885) Amounts reclassified from AOCI, net of income taxes (a) — 537 4 541 Net current-period other comprehensive income, net of income taxes (509) 161 4 (344) Balance at September 30, 2023 $ (5,404) $ (963) $ (272) $ (6,639) Balance at June 30, 2023 $ (4,736) $ (1,035) $ (273) $ (6,044) Other comprehensive income before reclassification, net of income taxes (668) (115) — (783) Amounts reclassified from AOCI, net of income taxes (a) — 187 1 188 Net current-period other comprehensive income, net of income taxes (668) 72 1 (595) Balance at September 30, 2023 $ (5,404) $ (963) $ (272) $ (6,639) (a) See table below for details about these reclassifications. Our reclassifications out of AOCI for the three and nine months ended September 30, 2024, and September 30, 2023, are as follows: Three months ended September 30, Affected Line Item in the Consolidated Statement of Income Dollars in millions 2024 2023 Unrealized gains (losses) on securities available for sale Realized gains $ — $ — Net securities gains (losses) Realized losses (935) — Net securities gains (losses) (935) — Income (loss) from continuing operations before income taxes (223) — Income taxes $ (712) $ — Income (loss) from continuing operations Unrealized gains (losses) on derivative financial instruments Interest rate $ (184) $ (248) Interest income — Loans Interest rate — — Interest expense — Long-term debt Interest rate (3) 2 Investment banking and debt placement fees (187) (246) Income (loss) from continuing operations before income taxes (45) (59) Income taxes $ (142) $ (187) Income (loss) from continuing operations Net pension and postretirement benefit costs Amortization of losses $ (3) $ (3) Other expense Settlement loss — — Other expense Amortization of unrecognized prior service credit — — Other expense (3) (3) Income (loss) from continuing operations before income taxes (1) (2) Income taxes $ (2) $ (1) Income (loss) from continuing operations Nine months ended September 30, Affected Line Item in the Consolidated Statement of Income Dollars in millions 2024 2023 Unrealized gains (losses) on securities available for sale Realized gains $ — $ — Net securities gains (losses) Realized losses (948) — Net securities gains (losses) (948) — Income (loss) from continuing operations before income taxes (227) — Income taxes $ (721) $ — Income (loss) from continuing operations Unrealized gains (losses) on derivative financial instruments Interest rate $ (599) $ (708) Interest income — Loans Interest rate (1) (1) Interest expense — Long-term debt Interest rate (2) 3 Investment banking and debt placement fees (602) (706) Income (loss) from continuing operations before income taxes (144) (169) Income taxes $ (458) $ (537) Income (loss) from continuing operations Net pension and postretirement benefit costs Amortization of losses $ (8) $ (8) Other expense Settlement loss — — Other expense Amortization of unrecognized prior service credit 1 1 Other expense (7) (7) Income (loss) from continuing operations before income taxes (3) (3) Income taxes $ (4) $ (4) Income (loss) from continuing operations

Shareholders' Equity

Shareholders' Equity	9 Months Ended
	Sep. 30, 2024
Equity [Abstract]
Shareholders' Equity	19. Shareholders' Equity Comprehensive Capital Plan During the third quarter of 2024, Key did not complete any open market share repurchases. We repurchased less than $1 million of shares related to equity compensation programs in the third quarter of 2024. Consistent with our capital plan, the Board declared a quarterly dividend of $.205 per Common Share for the third quarter of 2024. Scotiabank Investment On August 12, 2024, we entered into an Investment Agreement with Scotiabank pursuant to which Scotiabank agreed to make a strategic minority investment in KeyCorp of approximately $2.8 billion, representing approximately 14.9% pro forma common stock ownership of KeyCorp, for a fixed price of $17.17 per share. On August 30, 2024, Scotiabank completed the initial purchase of 47,829,359 of KeyCorp’s Common Shares with an investment of approximately $821 million in gross proceeds. With this investment, Scotiabank owns approximately 4.9% of KeyCorp’s Common Shares. The parties expect to complete the final purchase of approximately $2.0 billion of KeyCorp’s Common Shares in the first quarter of 2025, subject to Federal Reserve approval. The exact number of shares to be issued in connection with the final purchase is dependent on the total shares outstanding at the time of final purchase which precludes equity classification of the Investment Agreement. As such the Investment Agreement is accounted for as a financial instrument at fair value with changes recorded through earnings. As of September 30, 2024, the value of the financial instrument did not have a material impact to our results of operations or financial condition. In connection with the completion of the initial purchase of the Scotiabank investment, we incurred $10 million in issuance costs, which are classified in shareholders’ equity and recorded against the gross proceeds received. Preferred Stock The following table summarizes our preferred stock at September 30, 2024. Preferred stock series Amount outstanding (in millions) Book value (net of capital surplus) Shares authorized and outstanding Par value Liquidation preference Ownership interest per depositary share Liquidation preference per depositary share Third quarter 2024 dividends paid per depositary share 5.000% Fixed-to-Floating Rate Perpetual Noncumulative Series D $ 525 $ 519 21,000 $ 1 $ 25,000 1/25th $ 1,000 $ 12.50 6.125% Fixed-to-Floating Rate Perpetual Noncumulative Series E 500 490 500,000 1 1,000 1/40th 25 .382813 5.650% Fixed Rate Perpetual Noncumulative Series F 425 412 425,000 1 1,000 1/40th 25 .353125 5.625% Fixed Rate Perpetual Non-Cumulative Series G 450 435 450,000 1 1,000 1/40th 25 .351563 6.200% Fixed Rate Reset Perpetual Non-Cumulative Series H 600 590 600,000 1 1,000 1/40th 25 .387500

Business Segment Reporting

Business Segment Reporting	9 Months Ended
	Sep. 30, 2024
Segment Reporting [Abstract]
Business Segment Reporting	20. Business Segment Reporting The following is description of the segments and their primary businesses at September 30, 2024. Consumer Bank The Consumer Bank serves individuals and small businesses throughout our 15-state branch footprint as well as healthcare professionals nationally through our Laurel Road digital brand by offering a variety of deposit and investment products, personal finance and financial wellness services, lending, mortgage and home equity, student loan refinancing, credit card, treasury services, and business advisory services. In addition, wealth management and investment services are offered to assist institutional, non-profit, and high-net-worth clients with their banking, trust, portfolio management, charitable giving, and related needs. Commercial Bank The Commercial Bank is an aggregation of our Institutional and Commercial operating segments. The Commercial operating segment is a full-service corporate bank focused principally on serving the borrowing, cash management, and capital markets needs of middle market clients within Key’s 15-state branch footprint. The Institutional operating segment operates nationally in providing lending, equipment financing, and banking products and services to large corporate and institutional clients. The industry coverage and product teams have established expertise in the following sectors: Consumer, Energy, Healthcare, Industrial, Public Sector, Real Estate, and Technology. It is also a significant, national, commercial real estate lender and third-party servicer of commercial mortgage loans and a special servicer of CMBS. The Institutional operating segment is also a significant, national, commercial real estate lender and third-party master and special servicer of commercial mortgage loans. The operating segment also includes the KBCM platform which provides a broad suite of capital markets products and services including syndicated finance, debt and equity underwriting, fixed income and equity sales and trading, derivatives, foreign exchange, mergers & acquisition and other advisory, and public finance. Other Other includes various corporate treasury activities such as management of our investment securities portfolio, long-term debt, short-term liquidity and funding activities, and balance sheet risk management, our principal investing unit, and various exit portfolios as well as reconciling items, which primarily represent the unallocated portion of nonearning assets of corporate support functions. Charges related to the funding of these assets are part of net interest income and are allocated to the business segments through noninterest expense. Reconciling items also include intercompany eliminations and certain items that are not allocated to the business segments because they do not reflect their normal operations. Developing and applying the methodologies that we use to allocate items among our lines of business is a dynamic process. Accordingly, financial results may be revised periodically to reflect enhanced alignment of expense base allocation drivers, changes in the risk profile of a particular business, or changes in our organizational structure. The table below shows selected financial data for our business segments for the three- and nine-month periods ended September 30, 2024, and September 30, 2023. Capital is assigned to each business segment based on a combination of regulatory and economic equity. Three months ended September 30, Consumer Bank Commercial Bank Other Total Key Dollars in millions 2024 2023 2024 2023 2024 2023 2024 2023 SUMMARY OF OPERATIONS Net interest income (TE) $ 584 $ 534 $ 460 $ 446 $ (80) $ (57) $ 964 $ 923 Noninterest income 230 241 408 363 (907) 39 (269) 643 Total revenue (TE) (a) 814 775 868 809 (987) (18) 695 1,566 Provision for credit losses 52 14 41 68 2 (1) 95 81 Depreciation and amortization expense 17 21 18 21 18 13 53 55 Other noninterest expense 632 655 427 412 (18) (12) 1,041 1,055 Income (loss) from continuing operations before income taxes (TE) 113 85 382 308 (989) (18) (494) 375 Allocated income taxes and TE adjustments 27 20 82 68 (192) (15) (83) 73 Income (loss) from continuing operations 86 65 300 240 (797) (3) (411) 302 Income (loss) from discontinued operations, net of taxes — — — — 1 1 1 1 Net income (loss) $ 86 $ 65 $ 300 $ 240 $ (796) $ (2) $ (410) $ 303 AVERAGE BALANCES (b) Loans and leases $ 38,332 $ 41,610 $ 67,452 $ 75,598 $ 460 $ 419 $ 106,244 $ 117,627 Total assets (a) 41,188 44,429 76,395 85,930 70,026 61,982 187,609 192,341 Deposits 86,431 82,683 58,696 56,078 2,644 6,064 147,771 144,825 OTHER FINANCIAL DATA Net loan charge-offs (b) $ 54 $ 36 $ 99 $ 35 $ 1 $ — $ 154 $ 71 Return on average allocated equity (b) 10.34 % 7.42 % 11.98 % 9.11 % (125.18) % 11.90 % (10.35) % 8.66 % Return on average allocated equity 10.34 7.42 11.98 9.11 (125.02) 7.93 (10.32) 8.69 Average full-time equivalent employees (c) 7,388 7,666 2,387 2,549 7,030 7,451 16,805 17,666 (a) Substantially all revenue generated by our major business segments is derived from clients that reside in the United States. Substantially all long-lived assets, including premises and equipment, capitalized software, and goodwill held by our major business segments, are located in the United States. (b) From continuing operations. (c) The number of average full-time equivalent employees was not adjusted for discontinued operations. Nine months ended September 30, Consumer Bank Commercial Bank Other Total Key Dollars in millions 2024 2023 2024 2023 2024 2023 2024 2023 SUMMARY OF OPERATIONS Net interest income (TE) $ 1,651 $ 1,677 $ 1,268 $ 1,414 $ (170) $ (76) $ 2,749 $ 3,015 Noninterest income 689 709 1,167 1,079 (851) 72 1,005 1,860 Total revenue (TE) (a) 2,340 2,386 2,435 2,493 (1,021) (4) 3,754 4,875 Provision for credit losses 83 106 231 283 (18) (2) 296 387 Depreciation and amortization expense 58 62 59 67 44 47 161 176 Other noninterest expense 1,943 1,938 1,258 1,213 (46) 35 3,155 3,186 Income (loss) from continuing operations before income taxes (TE) 256 280 887 930 (1,001) (84) 142 1,126 Allocated income taxes and TE adjustments 61 67 176 196 (176) (36) 61 227 Income (loss) from continuing operations 195 213 711 734 (825) (48) 81 899 Income (loss) from discontinued operations, net of taxes — — — — 2 3 2 3 Net income (loss) $ 195 $ 213 $ 711 $ 734 $ (823) $ (45) $ 83 $ 902 AVERAGE BALANCES (b) Loans and leases $ 39,139 $ 42,118 $ 69,105 $ 76,816 $ 494 $ 437 $ 108,738 $ 119,371 Total assets (a) 41,966 44,945 78,234 86,727 66,491 61,551 186,691 193,223 Deposits 85,305 82,535 57,467 53,983 2,182 7,198 144,954 143,716 OTHER FINANCIAL DATA Net loan charge-offs (b) $ 144 $ 93 $ 200 $ 76 (18) (1) $ 326 $ 168 Return on average allocated equity (b) 7.64 % 8.04 % 9.50 % 9.37 % (68.90) % (713.06) % 0.72 % 8.57 % Return on average allocated equity 7.64 8.04 9.50 9.37 (68.74) (668.50) 0.74 8.60 Average full-time equivalent employees (c) 7,360 7,850 2,347 2,530 7,027 7,500 16,734 17,880 (a) Substantially all revenue generated by our major business segments is derived from clients that reside in the United States. Substantially all long-lived assets, including premises and equipment, capitalized software, and goodwill held by our major business segments, are located in the United States. (b) From continuing operations. (c) The number of average full-time equivalent employees was not adjusted for discontinued operations.

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	21. Revenue from Contracts with Customers The following table represents a disaggregation of revenue from contracts with customers, by business segment, for the three- and nine-month periods ended September 30, 2024, and September 30, 2023. The development and application of the methodologies that we use to allocate items among our business segments is a dynamic process. Accordingly, financial results may be revised periodically to reflect enhanced alignment of expense base allocations drivers, changes in the risk profile of a particular business, or changes in our organizational structure. Three months ended September 30, 2024 Three months ended September 30, 2023 Dollars in millions Consumer Bank Commercial Bank Total Contract Revenue Consumer Bank Commercial Bank Total Contract Revenue NONINTEREST INCOME Trust and investment services income $ 114 $ 17 $ 131 $ 104 $ 16 $ 120 Investment banking and debt placement fees — 128 128 — 70 70 Services charges on deposit accounts 35 32 67 41 28 69 Cards and payments income 45 45 90 43 42 85 Other noninterest income 3 — 3 3 — 3 Total revenue from contracts with customers $ 197 $ 222 $ 419 $ 191 $ 156 $ 347 Other noninterest income (a) $ 219 $ 257 Noninterest income from Other (b) (907) 39 Total noninterest income $ (269) $ 643 (a) Noninterest income considered earned outside the scope of contracts with customers. (b) Other includes other segments that consists of corporate treasury, our principal investing unit, and various exit portfolios as well as reconciling items which primarily represents the unallocated portion of nonearning assets of corporate support functions. Charges related to the funding of these assets are part of net interest income and are allocated to the business segments through noninterest expense. Reconciling items also includes intercompany eliminations and certain items that are not allocated to the business segments because they do not reflect their normal operations. Refer to Note 20 (“Business Segment Reporting”) for more information. Nine months ended September 30, 2024 Nine months ended September 30, 2023 Dollars in millions Consumer Bank Commercial Bank Total Contract Revenue Consumer Bank Commercial Bank Total Contract Revenue NONINTEREST INCOME Trust and investment services income $ 334 $ 51 $ 385 $ 306 $ 50 $ 356 Investment banking and debt placement fees — 357 357 — 261 261 Services charges on deposit accounts 103 93 196 121 84 205 Cards and payments income 133 114 247 136 107 243 Other noninterest income 10 — 10 9 — 9 Total revenue from contracts with customers $ 580 $ 615 $ 1,195 $ 572 $ 502 $ 1,074 Other noninterest income (a) $ 661 $ 714 Noninterest income from Other(b) (851) 72 Total noninterest income $ 1,005 $ 1,860 We had no material contract assets or contract liabilities as of September 30, 2024, and September 30, 2023.

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 (Loss)	$ (410)	$ 303	$ 83	$ 902

Insider Trading Arrangements

Insider Trading Arrangements	3 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

Basis of Presentation and Acc_2

Basis of Presentation and Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Consolidation	The consolidated financial statements include the accounts of KeyCorp and its subsidiaries. All significant intercompany accounts and transactions have been eliminated in consolidation. Some previously reported amounts have been reclassified in the statements of cash flows from “other operating activities, net” to either the net change in “accrued income and other assets” or “accrued expense and other liabilities” to align with updated presentation. Some previously reported amounts have been reclassified in the statements of income from “other income” to “net securities gains (losses).” The consolidated financial statements include any voting rights entities in which we have a controlling financial interest. In accordance with the applicable accounting guidance for consolidations, we consolidate a VIE if we have: (i) a variable interest in the entity; (ii) the power to direct activities of the VIE that most significantly affect the entity’s economic performance; and (iii) the obligation to absorb losses of the entity or the right to receive benefits from the entity that could potentially be significant to the VIE (i.e., we are considered to be the primary beneficiary). Variable interests can include equity interests, subordinated debt, derivative contracts, leases, service agreements, guarantees, standby letters of credit, loan commitments, and other contracts, agreements, and financial instruments. See Note 11 (“Variable Interest Entities”) for information on our involvement with VIEs. We use the equity method to account for unconsolidated investments in voting rights entities or VIEs if we have significant influence over the entity’s operating and financing decisions (usually defined as a voting or economic interest of 20% to 50%, but not controlling). Unconsolidated investments in voting rights entities or VIEs in which we have a voting or economic interest of less than 20% or for which we do not have significant influence are carried at the cost measurement alternative or at fair value. Investments held by our registered broker-dealer and investment company subsidiaries (principal investing entities and Real Estate Capital line of business) are carried at fair value. The unaudited consolidated interim financial statements reflect all adjustments of a normal recurring nature and disclosures that are necessary for a fair presentation of the results for the interim periods presented. The results of operations for the interim period are not necessarily indicative of the results of operations to be expected for the full year. The interim financial statements should be read in conjunction with the audited consolidated financial statements and related notes included in our 2023 Form 10-K.
Subsequent Events	In preparing these financial statements, subsequent events were evaluated through the time the financial statements were issued. Financial statements are considered issued when they are widely distributed to all shareholders and other financial statement users or filed with the SEC.
Accounting Guidance Adopted in 2024	Accounting Guidance Adopted in 2024 Standard Date of Adoption Description Effect on Financial Statements or ASU 2022-03, Fair Value Measurement - January 1, 2024 Early adoption is The amendments clarify that a contractual restriction on the sale of an equity security is not considered part of the unit of account of the equity security and is not considered in measuring fair value. Entities cannot, as a separate unit of account, recognize and measure a contractual sale restriction. The amendments require disclosures for equity securities subject to contractual restrictions including; the fair value of equity securities subject to contractual sale restrictions reflected in the balance sheet, the nature and remaining duration of the restriction(s) and the circumstances that could cause a lapse in the restriction(s). The guidance should be applied prospectively with any adjustments from the adoption of the amendments recognized in earnings and disclosed on the date of adoption. The guidance did not have any impact on Key’s financial condition or results of operations.

Basis of Presentation and Acc_3

Basis of Presentation and Accounting Policies (Tables)	9 Months Ended
	Sep. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of New Accounting Pronouncements and Changes in Accounting Principles	Standard Date of Adoption Description Effect on Financial Statements or ASU 2022-03, Fair Value Measurement - January 1, 2024 Early adoption is The amendments clarify that a contractual restriction on the sale of an equity security is not considered part of the unit of account of the equity security and is not considered in measuring fair value. Entities cannot, as a separate unit of account, recognize and measure a contractual sale restriction. The amendments require disclosures for equity securities subject to contractual restrictions including; the fair value of equity securities subject to contractual sale restrictions reflected in the balance sheet, the nature and remaining duration of the restriction(s) and the circumstances that could cause a lapse in the restriction(s). The guidance should be applied prospectively with any adjustments from the adoption of the amendments recognized in earnings and disclosed on the date of adoption. The guidance did not have any impact on Key’s financial condition or results of operations.

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	9 Months Ended
	Sep. 30, 2024
Earnings Per Share [Abstract]
Schedule of Basic and Diluted Earnings Per Common Share	Our basic and diluted earnings per Common Share are calculated as follows: Three months ended September 30, Nine months ended September 30, Dollars in millions, except per share amounts 2024 2023 2024 2023 EARNINGS Income (loss) from continuing operations $ (411) $ 302 $ 81 $ 899 Less: Dividends on Preferred Stock 36 36 108 108 Income (loss) from continuing operations attributable to Key common shareholders (447) 266 (27) 791 Income (loss) from discontinued operations, net of taxes 1 1 2 3 Net income (loss) attributable to Key common shareholders $ (446) $ 267 $ (25) $ 794 WEIGHTED-AVERAGE COMMON SHARES Weighted-average Common Shares outstanding (000) 948,979 927,131 936,962 927,019 Effect of Common Share options and other stock awards (a) — 4,613 — 5,213 Weighted-average Common Shares and potential Common Shares outstanding (000) (b) 948,979 931,744 936,962 932,232 EARNINGS PER COMMON SHARE Income (loss) from continuing operations attributable to Key common shareholders $ (.47) $ .29 $ (.03) $ .85 Income (loss) from discontinued operations, net of taxes — — — — Net income (loss) attributable to Key common shareholders (c) (.47) .29 (.03) .86 Income (loss) from continuing operations attributable to Key common shareholders — assuming dilution $ (.47) $ .29 $ (.03) $ .85 Income (loss) from discontinued operations, net of taxes — assuming dilution — — — — Net income (loss) attributable to Key common shareholders—assuming dilution (c) (.47) .29 (.03) .85 (a) For periods ended in a loss from continuing operations attributable to Key common shareholders, anti-dilutive instruments have been excluded from the calculation of diluted earnings per share. (b) Assumes conversion of Common Share options and other stock awards and/or convertible preferred stock, as applicable. (c) EPS may not foot due to rounding.

Loan Portfolio (Tables)

Loan Portfolio (Tables)	9 Months Ended
	Sep. 30, 2024
Loans Receivables [Abstract]
Schedule of Loans by Category	Loan Portfolio by Portfolio Segment and Financing Receivable (a) Dollars in millions September 30, 2024 December 31, 2023 Commercial and industrial (b) $ 52,774 $ 55,815 Commercial real estate: Commercial mortgage 13,637 15,187 Construction 3,093 3,066 Total commercial real estate loans 16,730 18,253 Commercial lease financing (c) 2,913 3,523 Total commercial loans 72,417 77,591 Residential — prime loans: Real estate — residential mortgage 20,122 20,958 Home equity loans 6,555 7,139 Total residential — prime loans 26,677 28,097 Other consumer loans 5,338 5,916 Credit cards 914 1,002 Total consumer loans 32,929 35,015 Total loans (d) $ 105,346 $ 112,606 (a) Accrued interest of $480 million and $522 million at September 30, 2024, and December 31, 2023, respectively, presented in "Accrued income and other assets" on the Consolidated Balance Sheets is excluded from the amortized cost basis disclosed in this table. (b) Loan balances include $219 million and $207 million of commercial credit card balances at September 30, 2024, and December 31, 2023, respectively. (c) Commercial and industrial includes receivables held as collateral for a secured borrowing of $261 million at September 30, 2024, and no amounts held as collateral for a secured borrowing at December 31, 2023. Commercial lease financing includes receivables held as collateral for a secured borrowing of $3 million and $7 million at September 30, 2024, and December 31, 2023, respectively. Additional information pertaining to this secured borrowing is included in Note 20 (“Long-Term Debt”) beginning on page 169 of our 2023 Form 10-K. (d)

Asset Quality (Tables)

Asset Quality (Tables)	9 Months Ended
	Sep. 30, 2024
Credit Loss [Abstract]
Schedule of Financing Receivable, Allowance for Credit Loss	The changes in the ALLL by loan category for the periods indicated are as follows: Three months ended September 30, 2024: Dollars in millions June 30, 2024 Provision Charge-offs Recoveries September 30, 2024 Commercial and Industrial $ 682 $ 101 $ (131) $ 7 $ 659 Commercial real estate: Real estate — commercial mortgage 383 (19) (7) 1 358 Real estate — construction 66 (2) — — 64 Total commercial real estate loans 449 (21) (7) 1 422 Commercial lease financing 29 — — — 29 Total commercial loans 1,160 80 (138) 8 1,110 Real estate — residential mortgage 115 (5) — 1 111 Home equity loans 71 1 (1) 1 72 Other consumer loans 128 15 (17) 2 128 Credit cards 73 10 (11) 1 73 Total consumer loans 387 21 (29) 5 384 Total ALLL — continuing operations 1,547 101 (a) (167) 13 1,494 Discontinued operations 14 — (1) — 13 Total ALLL — including discontinued operations $ 1,561 $ 101 $ (168) $ 13 $ 1,507 (a) Excludes a credit for losses on lending-related commitments of $6 million. Three months ended September 30, 2023: Dollars in millions June 30, 2023 Provision Charge-offs Recoveries September 30, 2023 Commercial and Industrial $ 599 $ 29 $ (62) $ 10 $ 576 Commercial real estate: Real estate — commercial mortgage 315 46 (1) — 360 Real estate — construction 39 9 — — 48 Total commercial real estate loans 354 55 (1) — 408 Commercial lease financing 33 (2) — 1 32 Total commercial loans 986 82 (63) 11 1,016 Real estate — residential mortgage 200 (20) — 1 181 Home equity loans 96 (5) (1) 1 91 Other consumer loans 126 11 (14) 2 125 Credit cards 72 11 (9) 1 75 Total consumer loans 494 (3) (24) 5 472 Total ALLL — continuing operations 1,480 79 (a) (87) 16 1,488 Discontinued operations 18 (1) — — 17 Total ALLL — including discontinued operations $ 1,498 $ 78 $ (87) $ 16 $ 1,505 (a) Excludes a provision for losses on lending-related commitments of $2 million. Nine months ended September 30, 2024: Dollars in millions December 31, 2023 Provision Charge-offs Recoveries September 30, 2024 Commercial and Industrial $ 556 $ 336 $ (279) $ 46 $ 659 Commercial real estate: Real estate — commercial mortgage 419 (41) (22) 2 358 Real estate — construction 52 12 — — 64 Total commercial real estate loans 471 (29) (22) 2 422 Commercial lease financing 33 (3) (6) 5 29 Total commercial loans 1,060 304 (307) 53 1,110 Real estate — residential mortgage 162 (53) (2) 4 111 Home equity loans 86 (14) (2) 2 72 Other consumer loans 122 49 (49) 6 128 Credit cards 78 26 (35) 4 73 Total consumer loans 448 8 (88) 16 384 Total ALLL — continuing operations 1,508 312 (a) (395) 69 1,494 Discontinued operations 16 (1) (3) 1 13 Total ALLL — including discontinued operations $ 1,524 $ 311 $ (398) $ 70 $ 1,507 (a) Excludes a credit for losses on lending-related commitments of $16 million. Nine months ended September 30, 2023: Dollars in millions December 31, 2022 Provision Charge-offs Recoveries September 30, 2023 Commercial and Industrial $ 601 $ 81 $ (139) $ 33 $ 576 Commercial real estate: Real estate — commercial mortgage 203 171 (15) 1 360 Real estate — construction 28 20 — — 48 Total commercial real estate loans 231 191 (15) 1 408 Commercial lease financing 32 (4) — 4 32 Total commercial loans 864 268 (154) 38 1,016 Real estate — residential mortgage 196 (17) (1) 3 181 Home equity loans 98 (6) (4) 3 91 Other consumer loans 113 42 (37) 7 125 Credit cards 66 32 (27) 4 75 Total consumer loans 473 51 (69) 17 472 Total ALLL — continuing operations 1,337 319 (a) (223) 55 1,488 Discontinued operations 21 (2) (3) 1 17 Total ALLL — including discontinued operations $ 1,358 $ 317 $ (226) $ 56 $ 1,505 (a) Excludes a provision for losses on lending-related commitments of $68 million.
Schedule of Significant Macroeconomic Variables of Loan Portfolios	The following table discloses key macroeconomic variables for each loan portfolio. Segment Portfolio Key Macroeconomic Variables (a) Commercial Commercial and industrial BBB corporate bond rate (spread), fixed investment, business bankruptcies, GDP, industrial production, unemployment rate, and Producer Price Index Commercial real estate Property & real estate price indices, unemployment rate, business bankruptcies, GDP, and SOFR Commercial lease financing BBB corporate bond rate (spread), GDP, and unemployment rate Consumer Real estate — residential mortgage GDP, home price index, unemployment rate, and 30 year mortgage rate Home equity Home price index, unemployment rate, and 30 year mortgage rate Other consumer Unemployment rate and U.S. household income Credit cards Unemployment rate and U.S. household income Discontinued operations Unemployment rate (a) Variables include all transformations and interactions with other risk drivers. Additionally, variables may have varying impacts at different points in the economic cycle.
Schedule of Financing Receivable Credit Quality Indicators	Credit Risk Profile by Creditworthiness Category and Vintage (a)(b) As of September 30, 2024 Term Loans Revolving Loans Amortized Cost Basis Revolving Loans Converted to Term Loans Amortized Cost Basis Amortized Cost Basis by Origination Year and Internal Risk Rating Dollars in millions 2024 2023 2022 2021 2020 Prior Total Commercial and Industrial Risk Rating: Pass $ 4,215 $ 3,330 $ 7,612 $ 4,309 $ 1,895 $ 4,090 $ 22,943 $ 117 $ 48,511 Criticized (Accruing) 76 224 664 442 261 414 1,779 38 3,898 Criticized (Nonaccruing) 22 19 106 35 3 43 137 — 365 Total commercial and industrial 4,313 3,573 8,382 4,786 2,159 4,547 24,859 155 52,774 Current year gross write-offs — 6 40 105 4 25 99 — 279 Real estate — commercial mortgage Risk Rating: Pass 623 808 3,127 2,344 629 3,338 865 42 11,776 Criticized (Accruing) 19 66 705 372 87 406 22 11 1,688 Criticized (Nonaccruing) — — 55 71 2 43 2 — 173 Total real estate — commercial mortgage 642 874 3,887 2,787 718 3,787 889 53 13,637 Current year gross write-offs — — — — — 21 1 — 22 Real estate — construction Risk Rating: Pass 60 757 1,172 466 88 93 35 2 2,673 Criticized (Accruing) — 16 116 142 68 78 — — 420 Criticized (Nonaccruing) — — — — — — — — — Total real estate — construction 60 773 1,288 608 156 171 35 2 3,093 Current year gross write-offs — — — — — — — — — Commercial lease financing Risk Rating: Pass 235 465 685 415 255 777 — — 2,832 Criticized (Accruing) 2 30 17 10 8 14 — — 81 Criticized (Nonaccruing) — — — — — — — — — Total commercial lease financing 237 495 702 425 263 791 — 2,913 Current year gross write-offs — — — — — 6 — — 6 Total commercial loans $ 5,252 $ 5,715 $ 14,259 $ 8,606 $ 3,296 $ 9,296 $ 25,783 $ 210 $ 72,417 Total commercial loan current year gross write-offs $ — $ 6 $ 40 $ 105 $ 4 $ 52 $ 100 $ — $ 307 As of December 31, 2023 Term Loans Revolving Loans Amortized Cost Basis Revolving Loans Converted to Term Loans Amortized Cost Basis Amortized Cost Basis by Origination Year and Internal Risk Rating Dollars in millions 2023 2022 2021 2020 2019 Prior Total Commercial and Industrial Risk Rating: Pass $ 4,020 $ 10,145 $ 6,141 $ 2,539 $ 2,064 $ 3,534 $ 24,395 $ 123 $ 52,961 Criticized (Accruing) 84 361 427 233 127 170 1,140 15 2,557 Criticized (Nonaccruing) 14 49 50 2 28 70 84 — 297 Total commercial and industrial 4,118 10,555 6,618 2,774 2,219 3,774 25,619 138 55,815 Current year gross write-offs 1 7 35 8 11 21 105 — 188 Real estate — commercial mortgage Risk Rating: Pass 1,084 3,664 2,922 804 1,545 2,507 1,017 66 13,609 Criticized (Accruing) 6 646 411 15 186 193 20 1 1,478 Criticized (Nonaccruing) — — 1 3 7 55 34 — 100 Total real estate — commercial mortgage 1,090 4,310 3,334 822 1,738 2,755 1,071 67 15,187 Current year gross write-offs — 1 1 11 2 21 3 — 39 Real estate — construction Risk Rating: Pass 401 1,185 912 157 62 48 31 8 2,804 Criticized (Accruing) 10 40 60 64 41 47 — — 262 Criticized (Nonaccruing) — — — — — — — — — Total real estate — construction 411 1,225 972 221 103 95 31 8 3,066 Current year gross write-offs — — — — — — — — — Commercial lease financing Risk Rating: Pass 520 878 575 352 307 808 — — 3,440 Criticized (Accruing) 11 30 9 9 8 16 — — 83 Criticized (Nonaccruing) — — — — — — — — — Total commercial lease financing 531 908 584 361 315 824 — — 3,523 Current year gross write-offs $ — $ — $ — $ — $ — $ — $ — $ — $ — Total commercial loans $ 6,150 $ 16,998 $ 11,508 $ 4,178 $ 4,375 $ 7,448 $ 26,721 $ 213 $ 77,591 Total commercial loan current year gross write-offs $ 1 $ 8 $ 36 $ 19 $ 13 $ 42 $ 108 $ — $ 227 (a) Accrued intere st of $344 million a nd $383 million as of September 30, 2024, and December 31, 2023, respectively, presented in Other Assets on the Consolidated Balance Sheets, was excluded from the amortized cost basis disclosed in these tables. (b) Gross write-off information is presented on a year-to-date basis for the nine months ended September 30, 2024 and the twelve months ended December 31, 2023. Consumer Credit Exposure Credit Risk Profile by FICO Score and Vintage (a)(b) As of September 30, 2024 Term Loans Revolving Loans Amortized Cost Basis Revolving Loans Converted to Term Loans Amortized Cost Basis Amortized Cost Basis by Origination Year and FICO Score Dollars in millions 2024 2023 2022 2021 2020 Prior Total Real estate — residential mortgage FICO Score: 750 and above $ 159 $ 692 $ 5,786 $ 7,290 $ 2,275 $ 1,566 $ — $ — $ 17,768 660 to 749 52 119 628 697 218 289 — — 2,003 Less than 660 2 15 82 64 26 140 — — 329 No Score 1 2 1 1 1 15 1 — 22 Total real estate — residential mortgage 214 828 6,497 8,052 2,520 2,010 1 — 20,122 Current period gross write-offs 1 — — — — 1 — — 2 Home equity loans FICO Score: 750 and above 26 33 142 798 631 758 1,926 269 4,583 660 to 749 14 20 54 191 134 198 792 88 1,491 Less than 660 1 5 16 40 30 87 272 25 476 No Score — — — — — 1 4 — 5 Total home equity loans 41 58 212 1,029 795 1,044 2,994 382 6,555 Current period gross write-offs — — — — — 1 1 — 2 Other consumer loans FICO Score: 750 and above 76 157 1,192 1,258 560 268 90 — 3,601 660 to 749 51 115 291 284 137 113 185 — 1,176 Less than 660 7 25 60 59 31 28 56 — 266 No Score 26 18 17 16 7 14 197 — 295 Total consumer direct loans 160 315 1,560 1,617 735 423 528 — 5,338 Current period gross write-offs — 5 13 9 5 5 12 — 49 Credit cards FICO Score: 750 and above — — — — — — 438 — 438 660 to 749 — — — — — — 368 — 368 Less than 660 — — — — — — 107 — 107 No Score — — — — — — 1 — 1 Total credit cards — — — — — — 914 — 914 Current period gross write-offs — — — — — — 35 — 35 Total consumer loans $ 415 $ 1,201 $ 8,269 $ 10,698 $ 4,050 $ 3,477 $ 4,437 $ 382 $ 32,929 Total consumer loan current period gross write-offs $ 1 $ 5 $ 13 $ 9 $ 5 $ 7 $ 48 $ — $ 88 As of December 31, 2023 Term Loans Revolving Loans Amortized Cost Basis Revolving Loans Converted to Term Loans Amortized Cost Basis Amortized Cost Basis by Origination Year and FICO Score Dollars in millions 2023 2022 2021 2020 2019 Prior Total Real estate — residential mortgage FICO Score: 750 and above $ 680 $ 5,992 $ 7,785 $ 2,392 $ 586 $ 923 $ — $ — $ 18,358 660 to 749 180 739 780 248 90 240 — — 2,277 Less than 660 15 58 56 22 17 130 — — 298 No Score 2 1 1 1 — 18 2 — 25 Total real estate — residential mortgage 877 6,790 8,622 2,663 693 1,311 2 — 20,958 Current period gross write-offs — — — — — 1 — — 1 Home equity loans FICO Score: 750 and above — 85 1,575 435 114 378 2,034 331 4,952 660 to 749 24 65 229 152 66 164 886 107 1,693 Less than 660 3 13 38 27 17 77 281 31 487 No Score 2 — — — — 1 4 — 7 Total home equity loans 29 163 1,842 614 197 620 3,205 469 7,139 Current period gross write-offs (1) — — — — 2 — 1 2 Other consumer loans FICO Score: 750 and above 185 1,187 1,455 660 277 112 97 — 3,973 660 to 749 150 365 342 171 83 60 199 — 1,370 Less than 660 24 64 65 32 17 16 57 — 275 No Score 30 33 17 11 10 12 185 — 298 Total consumer direct loans 389 1,649 1,879 874 387 200 538 — 5,916 Current period gross write-offs 1 12 10 6 5 3 14 — 51 Credit cards FICO Score: 750 and above — — — — — — 489 — 489 660 to 749 — — — — — — 400 — 400 Less than 660 — — — — — — 112 — 112 No Score — — — — — — 1 — 1 Total credit cards — — — — — — 1,002 — 1,002 Current period gross write-offs — — — — — — 37 — 37 Total consumer loans $ 1,295 $ 8,602 $ 12,343 $ 4,151 $ 1,277 $ 2,131 $ 4,747 $ 469 $ 35,015 Total consumer current period gross write-offs $ — $ 12 $ 10 $ 6 $ 5 $ 6 $ 51 $ 1 $ 91 (a) Accrued intere st of $135 million and $139 million as of September 30, 2024, and December 31, 2023, respectively, presented in Other Assets on the Consolidated Balance Sheets, was excluded from the amortized cost basis disclosed in this table. (b) Gross write-off information is presented on a year-to-date basis for the nine months ended September 30, 2024 and the twelve months ended December 31, 2023.
Schedule of Past Due Loans Including Current Loans	The following aging analysis of past due and current loans as of September 30, 2024, and December 31, 2023, provides further information regarding Key’s credit exposure. Aging Analysis of Loan Portfolio (a) As of September 30, 2024 Current (b)(c) 30-59 Days Past Due (b) 60-89 Days Past Due (b) 90 and Greater Days Past Due (b) Non-performing Total Past Due and Non-performing Loans (b) Total Loans (d) Dollars in millions LOAN TYPE Commercial and industrial $ 52,258 $ 41 $ 37 $ 73 $ 365 $ 516 $ 52,774 Commercial real estate: Commercial mortgage 13,369 23 4 65 176 268 13,637 Construction 3,091 — — 2 — 2 3,093 Total commercial real estate loans 16,460 23 4 67 176 270 16,730 Commercial lease financing 2,913 — — — — — 2,913 Total commercial loans $ 71,631 $ 64 $ 41 $ 140 $ 541 $ 786 $ 72,417 Real estate — residential mortgage $ 20,022 $ 7 $ 6 $ — $ 87 $ 100 $ 20,122 Home equity loans 6,431 22 8 4 90 124 6,555 Other consumer loans 5,299 16 9 10 4 39 5,338 Credit cards 885 6 5 12 6 29 914 Total consumer loans $ 32,637 $ 51 $ 28 $ 26 $ 187 $ 292 $ 32,929 Total loans $ 104,268 $ 115 $ 69 $ 166 $ 728 $ 1,078 $ 105,346 (a) Amounts in table represent amortized cost and exclude loans held for sale. (b) Accrued inter est of $480 million p resented in “Accrued income and other assets” on the Consolidated Balance Sheets is excluded from the amortized cost basis disclosed in this table. (c) Includes balances of $100 million in Commercial mortgage and $5 million in Real estate - residential mortgage associated with loans sold to GNMA where Key has the right but not the obligation to repurchase. (d) Net of unearned income, net of deferred fees and costs, and unamortized discounts and premiums. As of December 31, 2023 Current (b) 30-59 Days Past Due (b) 60-89 Days Past Due (b) 90 and Greater Days Past Due (b) Non-performing Loans Total Past Due and Non-performing Loans (b) Total Loans (c) Dollars in millions LOAN TYPE Commercial and industrial $ 55,354 $ 62 $ 30 $ 72 $ 297 $ 461 $ 55,815 Commercial real estate: Commercial mortgage 15,049 25 3 10 100 138 15,187 Construction 3,065 1 — — — 1 3,066 Total commercial real estate loans 18,114 26 3 10 100 139 18,253 Commercial lease financing 3,520 2 1 — — 3 3,523 Total commercial loans $ 76,988 $ 90 $ 34 $ 82 $ 397 $ 603 $ 77,591 Real estate — residential mortgage $ 20,863 $ 17 $ 7 $ — $ 71 $ 95 $ 20,958 Home equity loans 7,001 27 10 4 97 138 7,139 Other consumer loans 5,877 16 10 9 4 39 5,916 Credit cards 974 6 5 12 5 28 1,002 Total consumer loans $ 34,715 $ 66 $ 32 $ 25 $ 177 $ 300 $ 35,015 Total loans $ 111,703 $ 156 $ 66 $ 107 $ 574 $ 903 $ 112,606 (a) Amounts in table represent amortized cost and exclude loans held for sale. (b) Accrued interest of $522 million presented in “Accrued income and other assets” on the Consolidated Balance Sheets is excluded from the amortized cost basis disclosed in this table. (c) Net of unearned income, net of deferred fees and costs, and unamortized discounts and premiums.
Schedule of Modified Financing Receivables	The following tables show the amortized cost basis at the end of the noted reporting periods of the loans modified to borrowers experiencing financial difficulty within the past 12 months or since the adoption of ASU 2022-02 for the reporting period in 2023. The tables do not include those modifications that only resulted in an insignificant payment delay. The tables do not include consumer loans that are still within a trial modification period. Trial modifications may be done for consumer borrowers where a trial payment plan period is offered in advance of a permanent loan modification. As of September 30, 2024, there were 110 loans totaling $19 million in a trial modification period. As of September 30, 2023, there were 115 loans totaling $17 million in a trial modification period. Commitments outstanding to lend additional funds to borrowers experiencing financial difficulty whose loans were modified were $29 million and $67 million at September 30, 2024 and September 30, 2023, respectively. As of September 30, 2024 Interest Rate Reduction Term Extension Other Combination Total Dollars in millions Amortized Cost Basis Amortized Cost Basis Amortized Cost Basis Amortized Cost Basis Amortized Cost Basis % of Total Loan Type LOAN TYPE Commercial and Industrial $ — $ 126 $ 11 $ 16 $ 153 0.29 % Commercial real estate: Commercial mortgage 28 189 3 — 220 1.61 Construction — 27 — — 27 0.87 Total commercial real estate loans 28 216 3 — 247 1.48 Commercial lease financing — — — — — — Total commercial loans $ 28 $ 342 $ 14 $ 16 $ 400 0.55 % Real estate — residential mortgage 1 — — 11 12 0.06 Home equity loans 3 1 1 6 11 0.17 Other consumer loans — 1 — 2 3 0.06 Credit cards — — — 4 4 0.44 Total consumer loans 4 2 1 23 30 0.09 Total loans $ 32 $ 344 $ 15 $ 39 $ 430 0.41 % As of September 30, 2023 Interest Rate Reduction Term Extension Other Combination Total Dollars in millions Amortized Cost Basis Amortized Cost Basis Amortized Cost Basis Amortized Cost Basis Amortized Cost Basis % of Total Loan Type LOAN TYPE Commercial and Industrial $ — $ 158 $ 46 $ 31 $ 235 0.41 % Commercial real estate: Commercial mortgage — 7 — — 7 0.05 Construction — — — — — — Total commercial real estate loans — 7 — — 7 0.04 Commercial lease financing — — — — — — Total commercial loans $ — $ 165 $ 46 $ 31 $ 242 0.30 % Real estate — residential mortgage 1 — 7 8 0.04 Home equity loans 1 — 1 5 7 0.10 Other consumer loans — 1 — 1 2 0.03 Credit cards — — — 3 3 0.30 Total consumer loans 2 1 1 16 20 0.06 Total loans $ 2 $ 166 $ 47 $ 47 $ 262 0.23 % The following table summarizes the financial impacts of loan modifications made to specific loans for the noted periods. Three months ended September 30, 2024 Weighted-average Interest Rate Change Weighted-average Term Extension (in years) LOAN TYPE Commercial and Industrial (17.00) % 0.42 Commercial mortgage — % 0.43 Real estate — residential mortgage (1.85) % 2.47 Home equity loans (4.68) % 5.60 Other consumer loans (4.18) % 0.40 Credit cards (12.13) % 0.25 Nine months ended September 30, 2024 Weighted-average Interest Rate Change Weighted-average Term Extension (in years) LOAN TYPE Commercial and Industrial (6.29) % 1.14 Commercial mortgage (1.91) % 0.20 Construction — % 3.20 Real estate — residential mortgage (1.73) % 5.77 Home equity loans (3.75) % 6.44 Other consumer loans (3.90) % 0.62 Credit cards (15.21) % 0.75 Three months ended September 30, 2023 Weighted-average Interest Rate Change Weighted-average Term Extension (in years) LOAN TYPE Commercial and Industrial 0.21 % 0.85 Real estate — residential mortgage (1.55) % 12.24 Home equity loans (3.71) % 5.56 Other consumer loans (4.65) % 1.32 Credit cards (11.52) % 0.75 Nine months ended September 30, 2023 Weighted-average Interest Rate Change Weighted-average Term Extension (in years) LOAN TYPE Commercial and Industrial 0.34 % 0.54 Commercial mortgage — % 1.08 Real estate — residential mortgage (2.03) % 7.56 Home equity loans (4.13) % 6.15 Other consumer loans (4.38) % 0.99 Credit cards (14.05) % 0.75 Three months ended September 30, 2024 Dollars in millions Interest Rate Reduction Term Extension Other Combination Total LOAN TYPE Commercial and Industrial $ — $ 1 $ — $ — $ 1 Commercial real estate Commercial mortgage 28 — — 1 29 Construction — — — — — Total commercial real estate loans 28 — — 1 29 Total commercial loans 28 1 — 1 30 Home equity loans $ — $ — $ — $ — $ — Total consumer loans $ — $ — $ — $ — $ — Total loans $ 28 $ 1 $ — $ 1 $ 30 Nine months ended September 30, 2024 Dollars in millions Interest Rate Reduction Term Extension Other Combination Total LOAN TYPE Commercial and Industrial $ — $ 17 $ — $ 1 $ 18 Commercial real estate Commercial mortgage 28 — 1 29 Construction — — — — — Total commercial real estate loans 28 — — 1 29 Total commercial loans 28 17 — 2 47 Home equity loans — — — 1 1 Total consumer loans $ — $ — $ — $ 1 $ 1 Total loans $ 28 $ 17 $ — $ 3 $ 48 As of September 30, 2024 Current 30-89 Days 90 and Greater Total Dollars in millions LOAN TYPE Commercial and Industrial $ 132 $ 18 $ 3 $ 153 Commercial real estate Commercial mortgage 189 — 31 220 Construction 27 — — 27 Total commercial real estate loans 348 18 34 400 Commercial lease financing — — — — Total commercial loans 348 18 34 400 Real estate — residential mortgage 9 3 — 12 Home equity loans 9 1 1 11 Other consumer loans 3 — — 3 Credit cards 4 — — 4 Total consumer loans $ 25 $ 4 $ 1 $ 30 Total loans $ 373 $ 22 $ 35 $ 430 The following table depicts the performance of loans that have been modified for borrowers experiencing financial difficulty since the adoption of ASU 2022-02 on January 1, 2023 through September 30, 2023. As of September 30, 2023 Current 30-89 Days 90 and Greater Total Dollars in millions LOAN TYPE Commercial and Industrial $ 231 $ 1 $ 3 $ 235 Commercial real estate Commercial mortgage 7 — — 7 Construction — — — — Total commercial real estate loans 238 1 3 242 Commercial lease financing — — — — Total commercial loans 238 1 3 242 Real estate — residential mortgage 8 — — 8 Home equity loans 7 — — 7 Other consumer loans 2 — — 2 Credit cards 3 — — 3 Total consumer loans $ 20 $ — $ — $ 20 Total loans $ 258 $ 1 $ 3 $ 262
Schedule of Changes in Liability for Credit Losses on Off-Balance Sheet Exposures	Changes in the liability for credit losses for off balance sheet exposures are summarized as follows: Three months ended September 30, Nine months ended September 30, Dollars in millions 2024 2023 2024 2023 Balance at beginning of period $ 286 $ 291 $ 296 $ 225 Provision (credit) for losses on off balance sheet exposures (6) 2 (16) 68 Other — (3) — (3) Balance at end of period $ 280 $ 290 $ 280 $ 290

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2024
Fair Value Disclosures [Abstract]
Schedule of Fair Value of Assets and Liabilities Measured on Recurring Basis	The following tables present these assets and liabilities at September 30, 2024, and December 31, 2023. September 30, 2024 December 31, 2023 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Dollars in millions ASSETS MEASURED ON A RECURRING BASIS Trading account assets: U.S. Treasury, agencies and corporations $ — $ 928 $ — $ 928 $ — $ 685 $ — $ 685 States and political subdivisions — 102 — 102 — 93 — 93 Other mortgage-backed securities — 355 — 355 — 340 — 340 Other securities — 14 — 14 — 21 — 21 Total trading account securities — 1,399 — 1,399 — 1,139 — 1,139 Commercial loans — 5 — 5 — 3 — 3 Total trading account assets — 1,404 — 1,404 — 1,142 — 1,142 Securities available for sale: U.S. Treasury, agencies and corporations — 9,223 — 9,223 — 9,026 — 9,026 Agency residential collateralized mortgage obligations — 12,991 — 12,991 — 15,478 — 15,478 Agency residential mortgage-backed securities — 7,321 — 7,321 — 3,589 — 3,589 Agency commercial mortgage-backed securities — 4,634 — 4,634 — 9,092 — 9,092 Other securities — — — — — — — — Total securities available for sale — 34,169 — 34,169 — 37,185 — 37,185 Other investments: Principal investments: Direct — — — — — — — — Indirect (measured at NAV) (a) — — — 16 — — — 17 Total principal investments — — — 16 — — — 17 Equity investments: Direct — 6 3 9 — — 2 2 Direct (measured at NAV) (a) — — — 45 — — — 40 Indirect (measured at NAV) (a) — — — 3 — — — 4 Total equity investments — 6 3 57 — — 2 46 Total other investments — 6 3 73 — — 2 63 Loans, net of unearned income (residential) — — 9 9 — — 9 9 Loans held for sale (residential) — 61 — 61 — 51 — 51 Derivative assets: Interest rate — 179 7 186 — 175 (2) 173 Foreign exchange 48 22 — 70 74 15 — 89 Commodity — 423 — 423 — 721 — 721 Credit — — — — — — — — Other — 10 1 11 — 14 2 16 Derivative assets 48 634 8 690 74 925 — 999 Netting adjustments (b) — — — (499) — — — (818) Total derivative assets 48 634 8 191 74 925 — 181 Total assets on a recurring basis at fair value $ 48 $ 36,274 $ 20 $ 35,907 $ 74 $ 39,303 $ 11 $ 38,631 LIABILITIES MEASURED ON A RECURRING BASIS Bank notes and other short-term borrowings: Short positions $ 79 $ 780 $ — $ 859 $ 30 $ 774 $ — $ 804 Derivative liabilities: Interest rate 1 694 — 695 — 985 — 985 Foreign exchange 40 23 — 63 58 15 — 73 Commodity — 401 — 401 — 698 — 698 Credit — 17 — 17 — 1 — 1 Other — 7 — 7 — 20 — 20 Derivative liabilities 41 1,142 — 1,183 58 1,719 — 1,777 Netting adjustments (b) — — — (343) — — — (473) Total derivative liabilities 41 1,142 — 840 58 1,719 — 1,304 Total liabilities on a recurring basis at fair value $ 120 $ 1,922 $ — $ 1,699 $ 88 $ 2,493 $ — $ 2,108 (a) Certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated balance sheet. (b) Netting adjustments represent the amounts recorded to convert our derivative assets and liabilities from a gross basis to a net basis in accordance with the applicable accounting guidance. The net basis takes into account the impact of bilateral collateral and master netting agreements that allow us to settle all derivative contracts with a single counterparty on a net basis and to offset the net derivative position with the related cash collateral. Total derivative assets and liabilities include these netting adjustments.
Schedule of Fair Value of Direct and Indirect Investments, Related Unfunded Commitments and Financial Support Provided	The following table presents the fair value of our direct and indirect principal investments and related unfunded commitments at September 30, 2024, as well as financial support provided for the three and nine months ended September 30, 2024, and September 30, 2023. Financial support provided Three months ended September 30, Nine months ended September 30, September 30, 2024 2024 2023 2024 2023 Dollars in millions Fair Value Unfunded Funded Funded Other Funded Funded Other Funded Funded Other Funded Funded Other INVESTMENT TYPE Direct investments $ — $ — $ — $ — $ — $ — $ — $ — $ — $ — Indirect investments (measured at NAV) (a) 16 1 — — — — — — — — Total $ 16 $ 1 $ — $ — $ — $ — $ — $ — $ — $ — (a) Our indirect investments consist of buyout funds, venture capital funds, and fund of funds. These investments are generally not redeemable. Instead, distributions are received through the liquidation of the underlying investments of the fund. An investment in any one of these funds typically can be sold only with the approval of the fund’s general partners. At September 30, 2024, no significant liquidation of the underlying investments has been communicated to Key. The purpose of funding our capital commitments to these investments is to allow the funds to make additional follow-on investments and pay fund expenses until the fund dissolves. We, and all other investors in the fund, are obligated to fund the full amount of our respective capital commitments to the fund based on our and their respective ownership percentages, as noted in the applicable Limited Partnership Agreement.
Schedule of Change in Fair Values of Level 3 Financial Instruments	The following table shows the components of the change in the fair values of our Level 3 financial instruments measured at fair value on a recurring basis for the three and nine months ended September 30, 2024, and September 30, 2023. Dollars in millions Beginning of Period Balance Gains (Losses) Included in Other Comprehensive Income Gains (Losses) Included in Earnings Purchases Sales Settlements Transfers Other Transfers into Level 3 Transfers out of Level 3 End of Period Balance Unrealized Gains (Losses) Included in Earnings Nine months ended September 30, 2024 Other investments Equity investments Direct (a) $ 2 $ — $ 1 $ — $ — $ — $ — $ — $ — $ 3 — Loans, net of unearned income (residential) 9 — — — — — (2) — 2 9 — Derivative instruments (b) Interest rate (2) — (5) (c) 7 — — — 2 (d) 5 (d) 7 — Other (e) 2 — — (c) — — — (1) — — 1 — Three months ended September 30, 2024 Other investments Equity investments Direct (a) $ 2 $ — $ 1 $ — $ — $ — $ — $ — $ — $ 3 — Loans, net of unearned income (residential) 11 — — — — — (2) — — 9 — Derivative instruments (b) Interest rate (2) — 2 (c) 6 — — — 1 (d) — (d) 7 — Other (e) 1 — — (c) — — — — — — 1 — Dollars in millions Beginning of Period Balance Gains (Losses) Included in Other Comprehensive Income Gains (Losses) Included in Earnings Purchases Sales Settlements Transfers Other Transfers into Level 3 Transfers out of Level 3 End of Period Balance Unrealized Gains (Losses) Included in Earnings Nine months ended September 30, 2023 Other investments Principal investments Direct (a) $ 1 $ — $ — $ — $ — $ — $ — $ — $ — $ 1 $ — Equity investments Direct (a) 2 — — — — — — — — 2 — Loans, net of unearned income (residential) 9 — — — — — — — — 9 — Derivative instruments (b) Interest rate 2 — (23) (c) 18 1 — — (3) (d) 6 (d) 1 — Credit (2) — — (c) — — — — — — Other (e) — — — (c) — — — — — (1) (1) — Three months ended September 30, 2023 Other investments Principal investments Direct (a) $ 1 $ — $ — $ — $ — $ — $ — $ — $ — $ 1 $ — Equity investments Direct (a) 2 — — — — — — — — 2 — Loans, net of unearned income (residential) 9 — — — — — — — — 9 — Derivative instruments (b) Interest rate 5 — (6) (c) — — — — — (d) 2 (d) 1 — Credit — — — (c) — — — — — — — — Other (e) 1 — — (c) — — — (2) — — (1) — (a) Realized and unrealized gains and losses on principal investments and other equity investments are reported in “other income” on the income statement. (b) Amounts represent Level 3 derivative assets less Level 3 derivative liabilities. (c) Realized and unrealized gains and losses on derivative instruments are reported in “corporate services income” and “other income” on the income statement. (d) Certain instruments previously classified as Level 2 were transferred to Level 3 because Level 3 unobservable inputs became significant. Certain derivatives previously classified as Level 3 were transferred to Level 2 because Level 3 unobservable inputs became less significant. (e) Amounts represent Level 3 interest rate lock commitments.
Schedule of Assets and Liabilities Measured at Fair Value on Nonrecurring Basis	The following table presents our assets measured at fair value on a nonrecurring basis at September 30, 2024, and December 31, 2023: September 30, 2024 December 31, 2023 Dollars in millions Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total ASSETS MEASURED ON A NONRECURRING BASIS Collateral-dependent loans $ — $ — $ 150 $ 150 $ — $ — $ 104 $ 104 Accrued income and other assets — — 25 25 — — 29 29 Total assets on a nonrecurring basis at fair value $ — $ — $ 175 $ 175 $ — $ — $ 133 $ 133
Schedule of Quantitative Information about Level 3 Fair Value Measurements	The range and weighted-average of the significant unobservable inputs used to measure the fair value of our material Level 3 recurring and nonrecurring assets at September 30, 2024, and December 31, 2023, along with the valuation techniques used, are shown in the following table: Level 3 Asset (Liability) Valuation Technique Significant Unobservable Input Range (Weighted-Average) (a), (b) Dollars in millions September 30, 2024 December 31, 2023 September 30, 2024 December 31, 2023 Recurring Loans, net of unearned income (residential) $ 9 $ 9 Market comparable pricing Comparability factor 61.71 - 95.00% (73.33%) 62.67-89.60% (70.83%) Derivative instruments: Interest rate 7 2 Discounted cash flows Probability of default .02 - 100% (4.30%) .02 - 100% (5.30%) Loss given default 0 - 1 (.491) 0 - 1 (.477) Insignificant level 3 assets, net of liabilities (c) 4 4 Nonrecurring Collateral-dependent loans 150 104 Fair value of collateral Credit and liquidity discount 0 - 100.00% (23.00%) 0 - 10.00% (5.00%) Accrued income and other assets: OREO and other Level 3 assets (d) 13 21 Appraised value Appraised value N/M N/M (a) The weighted average of significant unobservable inputs is calculated using a weighting relative to fair value. (b) For significant unobservable inputs with no range, a single figure is reported to denote the single quantitative factor used. (c) Represents the aggregate amount of Level 3 assets and liabilities measured at fair value on a recurring basis that are individually and in the aggregate insignificant. The amount includes certain equity investments and certain financial derivative assets and liabilities. (d) Excludes $12 million and $8 million pertaining to mortgage servicing assets measured at fair value as of September 30, 2024 and December 31, 2023, respectively. Refer to Note 8 (“Mortgage Servicing Assets”) for significant unobservable inputs pertaining to these assets.
Schedule of Fair Value Disclosures of Financial Instruments	The Levels in the fair value hierarchy ascribed to our financial instruments and the related carrying amounts at September 30, 2024, and December 31, 2023, are shown in the following tables. Assets and liabilities are further arranged by measurement category. September 30, 2024 Fair Value Dollars in millions Carrying Amount Level 1 Level 2 Level 3 Measured at NAV Netting Adjustment Total ASSETS (by measurement category) Fair value - net income Trading account assets (b) $ 1,404 $ — $ 1,404 $ — $ — $ — $ 1,404 Other investments (b) 1,117 — 6 1,047 64 — 1,117 Loans, net of unearned income (residential) (d) 9 — — 9 — — 9 Loans held for sale (residential) (b) 61 — 61 — — — 61 Derivative assets - trading (b) 212 48 642 8 — (486) (f) 212 Fair value - OCI Securities available for sale (b) 34,169 — 34,169 — — — 34,169 Derivative assets - hedging (b)(g) (21) — (8) — — (13) (f) (21) Amortized cost Held-to-maturity securities (c) 7,702 — 7,317 — — — 7,317 Loans, net of unearned income (d) 103,843 — — 100,480 — — 100,480 Loans held for sale (b) 997 — — 997 — — 997 Other Cash and other short-term investments (a) 24,072 24,072 — — — — 24,072 LIABILITIES (by measurement category) Fair value - net income Derivative liabilities - trading (b) $ 836 $ 41 $ 1,122 $ — $ — $ (327) (f) $ 836 Fair value - OCI Derivative liabilities - hedging (b)(g) 4 — 20 — — (16) (f) 4 Amortized cost Time deposits (e) 18,352 — 18,505 — — — 18,505 Short-term borrowings (a) 2,403 79 2,324 — — — 2,403 Long-term debt (e) 15,677 11,842 3,796 — — — 15,638 Other Deposits with no stated maturity (a) 132,001 — 132,001 — — — 132,001 December 31, 2023 Fair Value Dollars in millions Carrying Amount Level 1 Level 2 Level 3 Measured at NAV Netting Adjustment Total ASSETS (by measurement category) Fair value - net income Trading account assets (b) $ 1,142 $ — $ 1,142 $ — $ — $ — $ 1,142 Other investments (b) 1,244 — — 1,183 61 — 1,244 Loans, net of unearned income (residential) (d) 9 — — 9 — — 9 Loans held for sale (residential) (b) 51 — 51 — — — 51 Derivative assets - trading (b) 168 $ 74 886 — — (792) (f) 168 Fair value - OCI Securities available for sale (b) 37,185 — 37,185 — — — 37,185 Derivative assets - hedging (b)(g) 13 — 39 — — (26) (f) 13 Amortized cost Held-to-maturity securities (c) 8,575 — 8,056 — — — 8,056 Loans, net of unearned income (d) 111,089 — — 105,950 — — 105,950 Loans held for sale (b) 432 — — 432 — — 432 Other Cash and other short-term investments (a) 11,758 11,758 — — — — 11,758 LIABILITIES (by measurement category) Fair value - net income Derivative liabilities - trading (b) $ 1,304 $ 58 $ 1,707 $ — $ — $ (461) (f) $ 1,304 Fair value - OCI Derivative liabilities - hedging (b)(g) — — 12 — — (12) (f) — Amortized cost Time deposits (e) 14,776 — 14,911 — — — 14,911 Short-term borrowings (a) 3,091 30 3,061 — — — 3,091 Long-term debt (e) 19,554 11,288 7,720 — — — 19,008 Other Deposits with no stated maturity (a) 130,811 — 130,811 — — — 130,811 Valuation Methods and Assumptions (a) Fair value equals or approximates carrying amount. The fair value of deposits with no stated maturity does not take into consideration the value ascribed to core deposit intangibles. (b) Information pertaining to our methodology for measuring the fair values of these assets and liabilities is included in the sections entitled “Qualitative Disclosures of Valuation Techniques” and “Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis” within our 2023 Form 10-K Note 6 (“Fair Value Measurements”). Investments accounted for under the cost method (or cost less impairment adjusted for observable price changes for certain equity investments) are classified as Level 3 assets. These investments are not actively traded in an open market as sales for these types of investments are rare. The carrying amount of the investments carried at cost are adjusted for declines in value if they are considered to be other-than-temporary (or due to observable orderly transactions of the same issuer for equity investments eligible for the cost less impairment measurement alternative). These adjustments are included in “other income” on the income statement. (c) Fair values of held-to-maturity securities are determined by using models that are based on security-specific details, as well as relevant industry and economic factors. The most significant of these inputs are quoted market prices, interest rate spreads on relevant benchmark securities, and certain prepayment assumptions. We review the valuations derived from the models to ensure that they are reasonable and consistent with the values placed on similar securities traded in the secondary markets. (d) The fair value of loans is based on the present value of the expected cash flows. The projected cash flows are based on the contractual terms of the loans, adjusted for prepayments and use of a discount rate based on the relative risk of the cash flows, taking into account the loan type, maturity of the loan, liquidity risk, servicing costs, and a required return on debt and capital. In addition, an incremental liquidity discount is applied to certain loans, using historical sales of loans during periods of similar economic conditions as a benchmark. The fair value of loans includes lease financing receivables at their aggregate carrying amount, which is equivalent to their fair value. (e) Fair values of time deposits and long-term debt classified as Level 2 are based on discounted cash flows utilizing relevant market inputs. (f) Netting adjustments represent the amounts recorded to convert our derivative assets and liabilities from a gross basis to a net basis in accordance with the applicable accounting guidance. The net basis takes into account the impact of bilateral collateral and master netting agreements that allow us to settle all derivative contracts with a single counterparty on a net basis and to offset the net derivative position with the related cash collateral. Total derivative assets and liabilities include these netting adjustments. (g) Derivative assets-hedging and derivative liabilities-hedging includes both cash flow and fair value hedges. Additional information regarding our accounting policies for cash flow and fair value hedges is provided in Note 1 (“Summary of Significant Accounting Policies”) under the heading “Derivatives and Hedging” beginning on page 112 of our 2023 Form 10-K.

Securities (Tables)

Securities (Tables)	9 Months Ended
	Sep. 30, 2024
Investments, Debt and Equity Securities [Abstract]
Schedule of Details of Securities	The amortized cost, unrealized gains and losses, and approximate fair value of our securities available for sale and held-to-maturity securities are presented in the following tables. Gross unrealized gains and losses represent the difference between the amortized cost and the fair value of securities on the balance sheet as of the dates indicated. Accordingly, the amount of these gains and losses may change in the future as market conditions change. September 30, 2024 December 31, 2023 Dollars in millions Amortized Cost (a) Gross Unrealized Gains Gross Unrealized Losses Fair Value Amortized Cost (b) Gross Unrealized Gains Gross Unrealized Losses Fair Value SECURITIES AVAILABLE FOR SALE U.S. Treasury, agencies, and corporations $ 9,156 $ 97 $ 30 $ 9,223 $ 9,300 $ 6 $ 280 $ 9,026 Agency residential collateralized mortgage obligations 15,647 7 2,663 12,991 18,911 4 3,437 15,478 Agency residential mortgage-backed securities 7,808 23 510 7,321 4,189 — 600 3,589 Agency commercial mortgage-backed securities 5,002 — 368 4,634 10,295 — 1,203 9,092 Total securities available for sale $ 37,613 $ 127 $ 3,571 $ 34,169 $ 42,695 $ 10 $ 5,520 $ 37,185 HELD-TO-MATURITY SECURITIES Agency residential collateralized mortgage obligations $ 4,743 $ 8 $ 218 $ 4,533 $ 5,170 $ 9 $ 283 $ 4,896 Agency residential mortgage-backed securities 154 — 11 143 165 — 13 152 Agency commercial mortgage-backed securities 2,385 2 153 2,234 2,473 1 204 2,270 Asset-backed securities (c) 394 — 13 381 738 — 29 709 Other securities 26 — — 26 29 — — 29 Total held-to-maturity securities $ 7,702 $ 10 395 $ 7,317 $ 8,575 $ 10 $ 529 $ 8,056 (a) Amortized cost amounts exclude accrued interes t receivable which is recorded within Other Assets on the balance sheet. At September 30, 2024, accrued interest receivable on available for sale securities and held-to-maturity securities totaled $77 million and $22 million , respectively. (b) Amortized cost amounts exclude accrued interes t receivable which is recorded within Other Assets on the balance sheet. At December 31, 2023, accrued interest receivable on available for sale securities and held-to-maturity securities totaled $64 million and $25 million , respectively. (c) Consists primarily of $388 million of securities as of September 30, 2024, and $731 million of securities as of December 31, 2023, related to the purchase of senior notes from a securitization collateralized by sold indirect auto loans.
Schedule of Securities in an Unrealized Loss Position	The following table summarizes securities in an unrealized loss position for which an allowance for credit losses has not been recorded as of September 30, 2024, and December 31, 2023. Duration of Unrealized Loss Position Less than 12 Months 12 Months or Longer Total Dollars in millions Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses September 30, 2024 Securities available for sale: U.S Treasury, agencies, and corporations $ 3,228 $ 3 $ 766 $ 27 $ 3,994 $ 30 Agency residential collateralized mortgage obligations 93 — 11,807 2,663 11,900 2,663 Agency residential mortgage-backed securities 2,012 12 3,369 498 5,381 510 Agency commercial mortgage-backed securities — — 4,583 368 4,583 368 Held-to-maturity securities: Agency residential collateralized mortgage obligations 164 2 3,585 216 3,749 218 Agency residential mortgage-backed securities — — 143 11 143 11 Agency commercial mortgage-backed securities — — 2,162 153 2,162 153 Asset-backed securities — — 381 13 381 13 Other securities — — 8 — 8 — Total securities in an unrealized loss position $ 5,497 $ 17 $ 26,804 $ 3,949 $ 32,301 $ 3,966 December 31, 2023 Securities available for sale: U.S. Treasury, agencies, and corporations $ — $ — $ 8,532 $ 280 $ 8,532 $ 280 Agency residential collateralized mortgage obligations — — 14,979 3,437 14,979 3,437 Agency residential mortgage-backed securities 24 — 3,562 600 3,586 600 Agency commercial mortgage-backed securities 891 49 8,201 1,154 9,092 1,203 Held-to-maturity securities: Agency residential collateralized mortgage obligations 1,123 30 3,070 253 4,193 283 Agency residential mortgage-backed securities — — 152 13 152 13 Agency commercial mortgage-backed securities — — 2,199 204 2,199 204 Asset-backed securities — — 709 29 709 29 Other securities 17 — (a) 12 — 29 — Total securities in an unrealized loss position $ 2,055 $ 79 $ 41,416 $ 5,970 $ 43,471 $ 6,049 (a)
Schedule of Securities by Maturity	The following table shows our securities by remaining maturity at September 30, 2024. CMOs, other mortgage-backed securities, and asset-backed securities in the available for sale portfolio and held-to-maturity portfolio are presented based on their expected average lives. The remaining securities, in both the available-for-sale and held-to-maturity portfolios, are presented based on their remaining contractual maturity. Actual maturities may differ from expected or contractual maturities since borrowers have the right to prepay obligations with or without prepayment penalties. September 30, 2024 Securities Available for Sale Held to Maturity Securities Dollars in millions Amortized Cost Fair Value Amortized Cost Fair Value Due in one year or less $ 2,695 $ 2,688 $ 78 $ 76 Due after one through five years 12,034 11,778 3,444 3,336 Due after five through ten years 14,339 12,301 2,396 2,257 Due after ten years 8,545 7,402 1,784 1,648 Total $ 37,613 $ 34,169 $ 7,702 $ 7,317

Derivatives and Hedging Activ_2

Derivatives and Hedging Activities (Tables)	9 Months Ended
	Sep. 30, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Fair Values, Volume of Activity and Gain (Loss) Information Related to Derivative Instruments	The following table summarizes the fair values of our derivative instruments on a gross and net basis as of September 30, 2024, and December 31, 2023. Total derivative assets and liabilities are adjusted to take into account the impact of legally enforceable master netting agreements that allow us to settle all derivative contracts with a single counterparty on a net basis and to offset the net derivative position with the related cash collateral. Securities collateral related to legally enforceable master netting agreements is not offset on the balance sheet. Our derivative instruments are included in “accrued income and other assets” or “accrued expenses and other liabilities” on the Consolidated Balance Sheets, as follows: September 30, 2024 December 31, 2023 Fair Value (a) Fair Value (a) Dollars in millions Notional Derivative Assets Derivative Liabilities Notional Amount Derivative Assets Derivative Liabilities Derivatives designated as hedging instruments: Interest rate $ 58,507 $ (8) $ 20 $ 44,621 $ 39 $ 12 Derivatives not designated as hedging instruments: Interest rate 72,584 194 675 78,051 134 973 Foreign exchange 6,383 70 63 6,034 89 73 Commodity 8,832 423 401 11,611 721 698 Credit 136 — 17 121 — 1 Other (b) 3,147 11 7 2,683 16 20 Total derivatives not designated as hedging instruments: 91,082 698 1,163 98,500 960 1,765 Netting adjustments (c) — (499) (343) — (818) (473) Net derivatives in the balance sheet 149,589 191 840 143,121 181 1,304 Other collateral (d) — — (2) — (1) (18) Net derivative amounts $ 149,589 $ 191 $ 838 $ 143,121 $ 180 $ 1,286 (a) We take into account bilateral collateral and master netting agreements that allow us to settle all derivative contracts held with a single counterparty on a net basis, and to offset the net derivative position with the related cash collateral when recognizing derivative assets and liabilities. As a result, we could have derivative contracts with negative fair values included in derivative assets and contracts with positive fair values included in derivative liabilities. (b) Other derivatives include interest rate lock commitments related to our residential and commercial banking activities, forward sale commitments related to our residential mortgage banking activities, forward purchase and sales contracts consisting of contractual commitments associated with “to be announced” securities and when-issued securities, and other customized derivative contracts. (c) Netting adjustments represent the amounts recorded to convert our derivative assets and liabilities from a gross basis to a net basis in accordance with the applicable accounting guidance. As of September 30, 2024, excess collateral that has not been offset against net derivative instrument positions totaled $170 million of cash collateral and $261 million of securities collateral posted as well as $30 million of cash collateral and $188 million of securities collateral held. As of December 31, 2023, excess collateral that has not been offset against net derivative instrument positions totaled $161 million of cash collateral and $269 million of securities collateral posted as well as $16 million of cash collateral and $212 million of securities collateral held. (d) Other collateral represents the amount that cannot be used to offset our derivative assets and liabilities from a gross basis to a net basis in accordance with the applicable accounting guidance. The other collateral consists of securities and is exchanged under bilateral collateral and master netting agreements that allow us to offset the net derivative position with the related collateral. The application of the other collateral cannot reduce the net derivative position below zero. Therefore, excess other collateral, if any, is not reflected above.
Schedule of Pre-Tax Net Gains (Losses) on Fair Value Hedges	The following tables summarize the amounts that were recorded on the balance sheet as of September 30, 2024, and December 31, 2023, related to cumulative basis adjustments for fair value hedges. September 30, 2024 Dollars in millions Balance sheet line item in which the hedge item is included Carrying amount of hedged item (a) Hedge accounting basis adjustment (b) Interest rate contracts Long-term debt $ 10,500 $ (240) Interest rate contracts Securities Available for Sale (c) 12,286 (300) December 31, 2023 Balance sheet line item in which the hedge item is included Carrying amount of hedged item (a) Hedge accounting basis adjustment (b) Interest rate contracts Long-term debt $ 9,919 $ (437) Interest rate contracts Securities Available for Sale (c) 8,655 (152) (a) The carrying amount represents the portion of the asset or liability designated as the hedged item. (b) Basis adjustments related to de-designated hedged items that no longer qualify as fair value hedges reduced the hedge accounting basis adjustm en t by $5 million a nd $5 million at September 30, 2024, and December 31, 2023, respectively. (c) Certain amounts are designed as fair value hedges under the portfolio layer method. The carrying amount represents the amortized costs basis of the prepayable financial assets used to designate hedging relationships in which the hedged item is the l ast layer expected to be remaining at the end of the relationship. At September 30, 2024, and December 31, 2023, the amortized costs of the closed portfolios in these hedging relationships was $12.3 billion and $12.8 billion, respectively, of which $7.2 billion were designated in a portfolio layer hedging relationship for both period ends. At September 30, 2024, and December 31, 2023, the cumulative basis adjustments associated with these amounts totaled $195 million and $147 million, respectively.
Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location	The following tables summarize the effect of fair value and cash flow hedge accounting on the income statement for the three- and nine-month periods ended September 30, 2024, and September 30, 2023. Location and amount of net gains (losses) recognized in income on fair value and cash flow hedging relationships Dollars in millions Interest expense – long-term debt Interest income – loans Interest Income - securities Investment banking and debt placement fees Three months ended September 30, 2024 Total amounts presented in the consolidated statement of income $ (292) $ 1,516 $ 298 $ 171 Net gains (losses) on fair value hedging relationships Interest contracts Recognized on hedged items $ (333) $ — $ 329 $ — Recognized on derivatives designated as hedging instruments 258 — (285) — Net income (expense) recognized on fair value hedges $ (75) $ — $ 44 $ — Net gain (loss) on cash flow hedging relationships Interest contracts Realized gains (losses) (pre-tax) reclassified from AOCI into net income $ — $ (184) $ — $ (3) Net income (expense) recognized on cash flow hedges $ — $ (184) $ — $ (3) Three months ended September 30, 2023 Total amounts presented in the consolidated statement of income $ (351) $ 1,593 $ 192 $ 141 Net gains (losses) on fair value hedging relationships Interest contracts Recognized on hedged items $ 3 $ — $ (54) $ — Recognized on derivatives designated as hedging instruments (54) — 63 — Net income (expense) recognized on fair value hedges $ (51) $ — $ 9 $ — Net gain (loss) on cash flow hedging relationships Interest contracts Realized gains (losses) (pre-tax) reclassified from AOCI into net income $ — $ (248) $ — $ 2 Net income (expense) recognized on cash flow hedges $ — $ (248) $ — $ 2 Location and amount of net gains (losses) recognized in income on fair value and cash flow hedging relationships Dollars in millions Interest expense – long-term debt Interest income – loans Interest Income - Securities Investment banking and debt placement fees Nine months ended September 30, 2024 Total amounts presented in the consolidated statement of income $ (952) $ 4,578 $ 789 $ 467 Net gains (losses) on fair value hedging relationships Interest contracts Recognized on hedged items $ (198) $ — $ 156 $ — Recognized on derivatives designated as hedging instruments (22) — (47) — Net income (expense) recognized on fair value hedges $ (220) $ — $ 109 $ — Net gain (loss) on cash flow hedging relationships Interest contracts Realized gains (losses) (pre-tax) reclassified from AOCI into net income $ (1) $ (599) $ — $ (2) Net income (expense) recognized on cash flow hedges $ (1) $ (599) $ — $ (2) Nine months ended September 30, 2023 Total amounts presented in the consolidated statement of income $ (975) $ 4,645 $ 580 $ 406 Net gains (losses) on fair value hedging relationships Interest contracts Recognized on hedged items $ 226 $ — $ (72) $ — Recognized on derivatives designated as hedging instruments (374) — 93 — Net income (expense) recognized on fair value hedges $ (148) $ — $ 21 $ — Net gain (loss) on cash flow hedging relationships Interest contracts Realized gains (losses) (pre-tax) reclassified from AOCI into net income $ (1) $ (708) $ — $ 3 Net income (expense) recognized on cash flow hedges $ (1) $ (708) $ — $ 3
Schedule of Derivative Instrument Cash Flow Hedge Earning Recognized by Income Statement Location	The following tables summarize the pre-tax net gains (losses) on our cash flow hedges for the three- and nine-month periods ended September 30, 2024, and September 30, 2023, and where they are recorded on the income statement. The table includes net gains (losses) recognized in OCI during the period and net gains (losses) reclassified from OCI into income during the current period. Dollars in millions Net Gains (Losses) Recognized in OCI Income Statement Location of Net Gains (Losses) Reclassified From OCI Into Income Net Gains (Losses) Reclassified From OCI Into Income Three months ended September 30, 2024 Cash Flow Hedges Interest rate $ 410 Interest income — Loans $ (184) Interest rate — Interest expense — Long-term debt — Interest rate (5) Investment banking and debt placement fees (3) Total $ 405 $ (187) Three months ended September 30, 2023 Cash Flow Hedges Interest rate $ (228) Interest income — Loans $ (248) Interest rate 12 Interest expense — Long-term debt — Interest rate 5 Investment banking and debt placement fees 2 Total $ (211) $ (246) Dollars in millions Net Gains (Losses) Recognized in OCI Income Statement Location of Net Gains (Losses) Reclassified From OCI Into Income Net Gains (Losses) Reclassified From OCI Into Income (a) Nine months ended September 30, 2024 Cash Flow Hedges Interest rate $ 49 Interest income — Loans $ (599) Interest rate 1 Interest expense — Long-term debt (1) Interest rate (4) Investment banking and debt placement fees (2) Total $ 46 $ (602) Nine months ended September 30, 2023 Cash Flow Hedges Interest rate $ (584) Interest income — Loans $ (708) Interest rate 8 Interest expense — Long-term debt (1) Interest rate 5 Investment banking and debt placement fees 3 Total $ (571) $ (706)
Schedule of Pre-Tax Net Gains (Losses) on Derivatives Not Designated as Hedging Instruments	The following table summarizes the pre-tax net gains (losses) on our derivatives that are not designated as hedging instruments for the three- and nine-month periods ended September 30, 2024, and September 30, 2023, and where they are recorded on the income statement. Three months ended September 30, 2024 Three months ended September 30, 2023 Dollars in millions Corporate services income Consumer mortgage income Other income Total Corporate services income Consumer mortgage income Other income Total NET GAINS (LOSSES) Interest rate $ 8 $ — $ 3 $ 11 $ 8 $ — $ 1 $ 9 Foreign exchange 13 — — 13 13 — — 13 Commodity 4 — — 4 5 — — 5 Credit — — (22) (22) — — (12) (12) Other — — 3 3 — 1 6 7 Total net gains (losses) $ 25 $ — $ (16) $ 9 $ 26 $ 1 $ (6) $ 22 Nine months ended September 30, 2024 Nine months ended September 30, 2023 Dollars in millions Corporate services income Consumer mortgage income Other income Total Corporate services income Consumer mortgage income Other income Total NET GAINS (LOSSES) Interest rate $ 27 $ — $ 4 $ 31 $ 33 $ — $ — $ 33 Foreign exchange 39 — — 39 39 — — 39 Commodity 9 — — 9 19 — — 19 Credit 1 — (36) (35) 2 — (43) (41) Other — 1 9 10 — 4 2 6 Total net gains (losses) $ 76 $ 1 $ (23) $ 54 $ 93 $ 4 $ (41) $ 56
Schedule of Fair Value of Derivative Assets by Type	The following table summarizes the fair value of our derivative assets by type at the dates indicated. These assets represent our net exposure to potential loss after taking into account the effects of bilateral collateral and master netting agreements and other means used to mitigate risk. Dollars in millions September 30, 2024 December 31, 2023 Interest rate $ 139 $ 123 Foreign exchange 22 42 Commodity 237 409 Credit — — Other 11 15 Derivative assets before collateral 409 589 Plus(Less): Related collateral (218) (408) Total derivative assets $ 191 $ 181
Schedule of Credit Derivatives Sold and Held	The following table provides information on the types of credit derivatives sold by us and held on the balance sheet at September 30, 2024, and December 31, 2023. The notional amount represents the amount that the seller could be required to pay. The payment/performance risk shown in the table represents a weighted average of the default probabilities for all reference entities in the respective portfolios. These default probabilities are implied from observed credit indices in the credit default swap market, which are mapped to reference entities based on Key’s internal risk rating. September 30, 2024 December 31, 2023 Dollars in millions Notional Average Term (Years) Payment / Performance Risk Notional Amount Average Term (Years) Payment / Performance Risk Other $ 12 5.24 2.07 % $ 4 10.69 4.86 % Total credit derivatives sold $ 12 — — $ 4 — —
Schedule of Credit Risk Contingent Feature	Refer to the table below for the aggregate fair value of all derivative contracts with credit risk contingent features held by Key’s banking affiliate KeyBank that were in a net liability position. Dollars in millions September 30, 2024 December 31, 2023 Net derivative liabilities with credit-risk contingent features $ (27) $ (45) Collateral posted 26 42

Mortgage Servicing Assets (Tabl

Mortgage Servicing Assets (Tables)	9 Months Ended
	Sep. 30, 2024
Servicing Asset [Abstract]
Schedule of Changes in Carrying Amount of Mortgage Servicing Assets	Changes in the carrying amount of commercial mortgage servicing assets are summarized as follows: Three months ended September 30, Nine months ended September 30, Dollars in millions 2024 2023 2024 2023 Balance at beginning of period $ 612 $ 627 $ 638 $ 653 Servicing retained from loan sales 17 40 44 66 Purchases 7 8 17 18 Amortization (30) (30) (93) (92) Temporary (impairments) recoveries — — — — Balance at end of period $ 606 $ 645 $ 606 $ 645 Fair value at end of period $ 816 $ 871 $ 816 $ 871 Changes in the carrying amount of residential mortgage servicing assets are summarized as follows: Three months ended September 30, Nine months ended September 30, Dollars in millions 2024 2023 2024 2023 Balance at beginning of period $ 109 $ 106 $ 108 $ 106 Servicing retained from loan sales 4 4 9 8 Purchases — — — — Amortization (3) (3) (8) (7) Temporary (impairments) recoveries (2) — (1) — Balance at end of period $ 108 $ 107 $ 108 $ 107 Fair value at end of period $ 129 $ 137 $ 129 $ 137
Schedule of Range and Weighted-Average of Significant Unobservable Inputs	The range and weighted average of the significant unobservable inputs used to determine the fair value of our commercial mortgage servicing assets at September 30, 2024, and September 30, 2023, along with the valuation techniques, are shown in the following table: September 30, 2024 September 30, 2023 Valuation Technique Significant Unobservable Input Range Weighted Average Range Weighted Average Discounted cash flow Expected defaults 1.00 % 2.00 % 1.01 % 1.00 % 2.00 % 1.01 % Residual cash flows discount rate 7.17 % 10.72 % 10.38 % 7.44 % 10.50 % 10.13 % Escrow earn rate 4.51 % 4.56 % 4.51 % 5.48 % 5.61 % 5.49 % Loan assumption rate — % 2.36 % 1.99 % — % 2.13 % 1.96 % September 30, 2024 September 30, 2023 Valuation Technique Significant Unobservable Input Range Weighted Average Range Weighted Average Discounted cash flow Prepayment speed 7.08 % 53.34 % 8.33 % 5.24 % 36.95 % 6.87 % Discount rate 6.50 % 8.75 % 6.60 % 6.50 % 8.75 % 6.59 % Servicing cost $ 70.00 $ 3,582 $ 75.25 $ 70.00 $ 4,332 $ 74.70

Leases (Tables)

Leases (Tables)	9 Months Ended
	Sep. 30, 2024
Leases [Abstract]
Schedule of Operating Lease, Lease Income	The components of equipment leasing income are summarized in the table below: Three months ended September 30, Nine months ended September 30, Dollars in millions 2024 2023 2024 2023 Sales-type and direct financing leases Interest income on lease receivable $ 17 $ 19 $ 53 $ 58 Interest income related to accretion of unguaranteed residual asset 2 3 7 10 Interest income on deferred fees and costs 5 2 15 2 Total sales-type and direct financing lease income $ 24 $ 24 $ 75 $ 70 Operating leases Operating lease income related to lease payments $ 16 $ 19 $ 53 $ 65 Other operating leasing gains — 3 8 5 Total operating lease income and other leasing gains 16 22 61 70 Total lease income $ 40 $ 46 $ 136 $ 140
Schedule of Sales-type Lease, Lease Income	The components of equipment leasing income are summarized in the table below: Three months ended September 30, Nine months ended September 30, Dollars in millions 2024 2023 2024 2023 Sales-type and direct financing leases Interest income on lease receivable $ 17 $ 19 $ 53 $ 58 Interest income related to accretion of unguaranteed residual asset 2 3 7 10 Interest income on deferred fees and costs 5 2 15 2 Total sales-type and direct financing lease income $ 24 $ 24 $ 75 $ 70 Operating leases Operating lease income related to lease payments $ 16 $ 19 $ 53 $ 65 Other operating leasing gains — 3 8 5 Total operating lease income and other leasing gains 16 22 61 70 Total lease income $ 40 $ 46 $ 136 $ 140
Schedule of Direct Financing Lease, Lease Income	The components of equipment leasing income are summarized in the table below: Three months ended September 30, Nine months ended September 30, Dollars in millions 2024 2023 2024 2023 Sales-type and direct financing leases Interest income on lease receivable $ 17 $ 19 $ 53 $ 58 Interest income related to accretion of unguaranteed residual asset 2 3 7 10 Interest income on deferred fees and costs 5 2 15 2 Total sales-type and direct financing lease income $ 24 $ 24 $ 75 $ 70 Operating leases Operating lease income related to lease payments $ 16 $ 19 $ 53 $ 65 Other operating leasing gains — 3 8 5 Total operating lease income and other leasing gains 16 22 61 70 Total lease income $ 40 $ 46 $ 136 $ 140

Goodwill (Tables)

Goodwill (Tables)	9 Months Ended
	Sep. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Carrying Amount of Goodwill	The carrying amount of goodwill by reporting segment is presented in the following table: Dollars in millions Consumer Bank Commercial Bank Total BALANCE AT SEPTEMBER 30, 2023 $ 1,819 $ 933 $ 2,752 BALANCE AT DECEMBER 31, 2023 $ 1,819 $ 933 $ 2,752 BALANCE AT SEPTEMBER 30, 2024 $ 1,819 $ 933 $ 2,752

Variable Interest Entities (Tab

Variable Interest Entities (Tables)	9 Months Ended
	Sep. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Variable Interest Entities Information	The assets and liabilities presented in the table below convey the size of KCDC’s direct and indirect investments at September 30, 2024, and December 31, 2023. As these investments represent unconsolidated VIEs, the assets and liabilities of the investments themselves are not recorded on our Consolidated Balance Sheets. Additional information pertaining to our LIHTC investments is included in Note 13 (“Variable Interest Entities”) beginning on page 154 of our 2023 Form 10-K. Unconsolidated VIEs Dollars in millions Total Assets Total Liabilities Maximum Exposure to Loss September 30, 2024 LIHTC investments $ 10,008 $ 4,579 $ 2,674 December 31, 2023 LIHTC investments $ 8,904 $ 3,848 $ 2,768 Unconsolidated VIEs Dollars in millions Total Assets Total Liabilities Maximum Exposure to Loss September 30, 2024 Indirect investments $ 2,372 $ 3 $ 17 December 31, 2023 Indirect investments $ 2,741 $ 91 $ 18 Other unconsolidated VIEs Dollars in millions Total Assets Total Liabilities September 30, 2024 Other unconsolidated VIEs $ 818 $ 1 December 31, 2023 Other unconsolidated VIEs $ 1,149 $ 1

Securities Financing Activiti_2

Securities Financing Activities (Tables)	9 Months Ended
	Sep. 30, 2024
Banking and Thrift, Other Disclosure [Abstract]
Schedule of Summarized Securities Financing Agreements	The following table summarizes our securities financing agreements at September 30, 2024, and December 31, 2023: September 30, 2024 December 31, 2023 Dollars in millions Gross Amount Presented in Balance Sheet Netting Adjustments (a) Collateral (b) Net Amounts Gross Amount Presented in Balance Sheet Netting Adjustments (a) Collateral (b) Net Amounts Offsetting of financial assets: Reverse repurchase agreements $ 3 $ (3) $ — $ — $ 7 $ (7) $ — $ — Securities borrowed — — — — — — — — Total $ 3 $ (3) $ — $ — $ 7 $ (7) $ — $ — Offsetting of financial liabilities: Repurchase agreements (c) $ 44 $ (3) $ (41) $ — $ 38 $ (7) $ (31) $ — Total $ 44 $ (3) $ (41) $ — $ 38 $ (7) $ (31) $ — (a) Netting adjustments take into account the impact of master netting agreements that allow us to settle with a single counterparty on a net basis. (b) These adjustments take into account the impact of bilateral collateral agreements that allow us to offset the net positions with the related collateral. The application of collateral cannot reduce the net position below zero. Therefore, excess collateral, if any, is not reflected above. (c) Repurchase agreements are collateralized by mortgage-backed securities and U.S. Treasuries and are contracted on an overnight or continuous basis.

Employee Benefits (Tables)

Employee Benefits (Tables)	9 Months Ended
	Sep. 30, 2024
Retirement Benefits [Abstract]
Schedule Of Net Pension Cost (Benefit) for All Funded and Unfunded Plans	The components of net pension cost (benefit) for all funded and unfunded plans are recorded in Other expense and are summarized in the following table. For more information on our Pension Plans and Other Postretirement Benefit Plans, see Note 18 (“Employee Benefits”) beginning on page 162 of our 2023 Form 10-K. Three months ended September 30, Nine months ended September 30, Dollars in millions 2024 2023 2024 2023 Interest cost on PBO $ 10 $ 11 $ 30 $ 33 Expected return on plan assets (10) (11) (29) (32) Amortization of losses 3 3 8 8 Settlement loss — — — — Net pension cost $ 3 $ 3 $ 9 $ 9

Trust Preferred Securities Is_2

Trust Preferred Securities Issued by Unconsolidated Subsidiaries (Tables)	9 Months Ended
	Sep. 30, 2024
Banking and Thrift, Other Disclosure [Abstract]
Schedule Of Trust Preferred Securities, Common Stock and Related Debentures	The trust preferred securities, common stock, and related debentures are summarized as follows: Dollars in millions Trust Preferred Securities, Net of Discount (a) Common Stock Principal Amount of Debentures, Net of Discount (b) Interest Rate of Trust Preferred Securities and Debentures (c) Maturity of Trust Preferred Securities and Debentures September 30, 2024 KeyCorp Capital I $ 156 $ 6 $ 162 6.333 % 2028 KeyCorp Capital II 87 4 91 6.875 2029 KeyCorp Capital III 113 4 117 7.750 2029 HNC Statutory Trust III 21 1 22 6.763 2035 HNC Statutory Trust IV 21 1 22 6.518 2037 Willow Grove Statutory Trust I 18 1 19 6.797 2036 Westbank Capital Trust II 8 — 8 7.265 2034 Westbank Capital Trust III 8 — 8 7.265 2034 Total $ 432 $ 17 $ 449 6.898 % — December 31, 2023 $ 431 $ 17 $ 448 6.981 % — (a) The trust preferred securities must be redeemed when the related debentures mature, or earlier if provided in the governing indenture. Each issue of trust preferred securities carries an interest rate identical to that of the related debenture. Certain trust preferred securities include basis adjustments related to fair value hedges totaling $20 million and $15 million at September 30, 2024, and December 31, 2023, respectively. See Note 7 (“Derivatives and Hedging Activities”) for an explanation of fair value hedges. (b) We have the right to redeem these debentures. If the debentures purchased by KeyCorp Capital I, HNC Statutory Trust III, Willow Grove Statutory Trust I, HNC Statutory Trust IV, Westbank Capital Trust II, or Westbank Capital Trust III are redeemed before they mature, the redemption price will be the principal amount, plus any accrued but unpaid interest. If the debentures purchased by KeyCorp Capital II or KeyCorp Capital III are redeemed before they mature, the redemption price will be the greater of: (i) the principal amount, plus any accrued but unpaid interest, or (ii) the sum of the present values of principal and interest payments discounted at the Treasury Rate (as defined in the applicable indenture), plus 20 basis points for KeyCorp Capital II or 25 basis points for KeyCorp Capital III, or 50 basis points in the case of redemption upon either a tax or a capital treatment event for either KeyCorp Capital II or KeyCorp Capital III, plus any accrued but unpaid interest. (c) The interest rates for the trust preferred securities issued by KeyCorp Capital II and KeyCorp Capital III are fixed. The trust preferred securities issued by KeyCorp Capital I, HNC Statutory Trust III, HNC Statutory Trust IV, Willow Grove Statutory Trust I, Westbank Capital Trust II, and Westbank Capital Trust III have a floating interest rate, based on three-month CME term SOFR plus 26.161 basis points, that reprices quarterly. The total interest rates are weighted-average rates.

Contingent Liabilities and Gu_2

Contingent Liabilities and Guarantees (Tables)	9 Months Ended
	Sep. 30, 2024
Commitments and Contingencies Disclosure [Abstract]
Schedule of Guarantees	The following table shows the types of guarantees that we had outstanding at September 30, 2024. Information pertaining to the basis for determining the liabilities recorded in connection with these guarantees is included in Note 1 (“Summary of Significant Accounting Policies”) under the heading “Contingencies and Guarantees” beginning on page 115 of our 2023 Form 10-K. September 30, 2024 Maximum Potential Undiscounted Future Payments Liability Recorded Dollars in millions Financial guarantees: Standby letters of credit $ 4,234 $ 77 Recourse agreement with FNMA 7,743 63 Residential mortgage reserve 3,385 8 Written put options (a) 2,315 104 Total $ 17,677 $ 252 (a) The maximum potential undiscounted future payments represent notional amounts of derivatives qualifying as guarantees.

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Tables)	9 Months Ended
	Sep. 30, 2024
Equity [Abstract]
Schedule of Changes in AOCI	Our changes in AOCI for the three and nine months ended September 30, 2024, and September 30, 2023, are as follows: Dollars in millions Unrealized gains (losses) on securities available for sale Unrealized gains (losses) on derivative financial instruments Net pension and postretirement benefit costs Total Balance at December 31, 2023 $ (4,190) $ (763) $ (276) $ (5,229) Other comprehensive income before reclassification, net of income taxes 850 (85) — 765 Amounts reclassified from AOCI, net of income taxes (a) 721 458 4 1,183 Net current-period other comprehensive income, net of income taxes 1,571 373 4 1,948 Balance at September 30, 2024 $ (2,619) $ (390) $ (272) $ (3,281) Balance at June 30, 2024 $ (4,282) $ (589) $ (273) $ (5,144) Other comprehensive income before reclassification, net of income taxes 951 57 (1) 1,007 Amounts reclassified from AOCI, net of income taxes (a) 712 142 2 856 Net current-period other comprehensive income, net of income taxes 1,663 199 1 1,863 Balance at September 30, 2024 $ (2,619) $ (390) $ (272) $ (3,281) Balance at December 31, 2022 $ (4,895) $ (1,124) $ (276) $ (6,295) Other comprehensive income before reclassification, net of income taxes (509) (376) — (885) Amounts reclassified from AOCI, net of income taxes (a) — 537 4 541 Net current-period other comprehensive income, net of income taxes (509) 161 4 (344) Balance at September 30, 2023 $ (5,404) $ (963) $ (272) $ (6,639) Balance at June 30, 2023 $ (4,736) $ (1,035) $ (273) $ (6,044) Other comprehensive income before reclassification, net of income taxes (668) (115) — (783) Amounts reclassified from AOCI, net of income taxes (a) — 187 1 188 Net current-period other comprehensive income, net of income taxes (668) 72 1 (595) Balance at September 30, 2023 $ (5,404) $ (963) $ (272) $ (6,639) (a) See table below for details about these reclassifications.
Schedule of Reclassifications Out of AOCI	Our reclassifications out of AOCI for the three and nine months ended September 30, 2024, and September 30, 2023, are as follows: Three months ended September 30, Affected Line Item in the Consolidated Statement of Income Dollars in millions 2024 2023 Unrealized gains (losses) on securities available for sale Realized gains $ — $ — Net securities gains (losses) Realized losses (935) — Net securities gains (losses) (935) — Income (loss) from continuing operations before income taxes (223) — Income taxes $ (712) $ — Income (loss) from continuing operations Unrealized gains (losses) on derivative financial instruments Interest rate $ (184) $ (248) Interest income — Loans Interest rate — — Interest expense — Long-term debt Interest rate (3) 2 Investment banking and debt placement fees (187) (246) Income (loss) from continuing operations before income taxes (45) (59) Income taxes $ (142) $ (187) Income (loss) from continuing operations Net pension and postretirement benefit costs Amortization of losses $ (3) $ (3) Other expense Settlement loss — — Other expense Amortization of unrecognized prior service credit — — Other expense (3) (3) Income (loss) from continuing operations before income taxes (1) (2) Income taxes $ (2) $ (1) Income (loss) from continuing operations Nine months ended September 30, Affected Line Item in the Consolidated Statement of Income Dollars in millions 2024 2023 Unrealized gains (losses) on securities available for sale Realized gains $ — $ — Net securities gains (losses) Realized losses (948) — Net securities gains (losses) (948) — Income (loss) from continuing operations before income taxes (227) — Income taxes $ (721) $ — Income (loss) from continuing operations Unrealized gains (losses) on derivative financial instruments Interest rate $ (599) $ (708) Interest income — Loans Interest rate (1) (1) Interest expense — Long-term debt Interest rate (2) 3 Investment banking and debt placement fees (602) (706) Income (loss) from continuing operations before income taxes (144) (169) Income taxes $ (458) $ (537) Income (loss) from continuing operations Net pension and postretirement benefit costs Amortization of losses $ (8) $ (8) Other expense Settlement loss — — Other expense Amortization of unrecognized prior service credit 1 1 Other expense (7) (7) Income (loss) from continuing operations before income taxes (3) (3) Income taxes $ (4) $ (4) Income (loss) from continuing operations

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	9 Months Ended
	Sep. 30, 2024
Equity [Abstract]
Schedule of Preferred Stock	The following table summarizes our preferred stock at September 30, 2024. Preferred stock series Amount outstanding (in millions) Book value (net of capital surplus) Shares authorized and outstanding Par value Liquidation preference Ownership interest per depositary share Liquidation preference per depositary share Third quarter 2024 dividends paid per depositary share 5.000% Fixed-to-Floating Rate Perpetual Noncumulative Series D $ 525 $ 519 21,000 $ 1 $ 25,000 1/25th $ 1,000 $ 12.50 6.125% Fixed-to-Floating Rate Perpetual Noncumulative Series E 500 490 500,000 1 1,000 1/40th 25 .382813 5.650% Fixed Rate Perpetual Noncumulative Series F 425 412 425,000 1 1,000 1/40th 25 .353125 5.625% Fixed Rate Perpetual Non-Cumulative Series G 450 435 450,000 1 1,000 1/40th 25 .351563 6.200% Fixed Rate Reset Perpetual Non-Cumulative Series H 600 590 600,000 1 1,000 1/40th 25 .387500

Business Segment Reporting (Tab

Business Segment Reporting (Tables)	9 Months Ended
	Sep. 30, 2024
Segment Reporting [Abstract]
Schedule of Selected Financial Data for Our Business Segments	The table below shows selected financial data for our business segments for the three- and nine-month periods ended September 30, 2024, and September 30, 2023. Capital is assigned to each business segment based on a combination of regulatory and economic equity. Three months ended September 30, Consumer Bank Commercial Bank Other Total Key Dollars in millions 2024 2023 2024 2023 2024 2023 2024 2023 SUMMARY OF OPERATIONS Net interest income (TE) $ 584 $ 534 $ 460 $ 446 $ (80) $ (57) $ 964 $ 923 Noninterest income 230 241 408 363 (907) 39 (269) 643 Total revenue (TE) (a) 814 775 868 809 (987) (18) 695 1,566 Provision for credit losses 52 14 41 68 2 (1) 95 81 Depreciation and amortization expense 17 21 18 21 18 13 53 55 Other noninterest expense 632 655 427 412 (18) (12) 1,041 1,055 Income (loss) from continuing operations before income taxes (TE) 113 85 382 308 (989) (18) (494) 375 Allocated income taxes and TE adjustments 27 20 82 68 (192) (15) (83) 73 Income (loss) from continuing operations 86 65 300 240 (797) (3) (411) 302 Income (loss) from discontinued operations, net of taxes — — — — 1 1 1 1 Net income (loss) $ 86 $ 65 $ 300 $ 240 $ (796) $ (2) $ (410) $ 303 AVERAGE BALANCES (b) Loans and leases $ 38,332 $ 41,610 $ 67,452 $ 75,598 $ 460 $ 419 $ 106,244 $ 117,627 Total assets (a) 41,188 44,429 76,395 85,930 70,026 61,982 187,609 192,341 Deposits 86,431 82,683 58,696 56,078 2,644 6,064 147,771 144,825 OTHER FINANCIAL DATA Net loan charge-offs (b) $ 54 $ 36 $ 99 $ 35 $ 1 $ — $ 154 $ 71 Return on average allocated equity (b) 10.34 % 7.42 % 11.98 % 9.11 % (125.18) % 11.90 % (10.35) % 8.66 % Return on average allocated equity 10.34 7.42 11.98 9.11 (125.02) 7.93 (10.32) 8.69 Average full-time equivalent employees (c) 7,388 7,666 2,387 2,549 7,030 7,451 16,805 17,666 (a) Substantially all revenue generated by our major business segments is derived from clients that reside in the United States. Substantially all long-lived assets, including premises and equipment, capitalized software, and goodwill held by our major business segments, are located in the United States. (b) From continuing operations. (c) The number of average full-time equivalent employees was not adjusted for discontinued operations. Nine months ended September 30, Consumer Bank Commercial Bank Other Total Key Dollars in millions 2024 2023 2024 2023 2024 2023 2024 2023 SUMMARY OF OPERATIONS Net interest income (TE) $ 1,651 $ 1,677 $ 1,268 $ 1,414 $ (170) $ (76) $ 2,749 $ 3,015 Noninterest income 689 709 1,167 1,079 (851) 72 1,005 1,860 Total revenue (TE) (a) 2,340 2,386 2,435 2,493 (1,021) (4) 3,754 4,875 Provision for credit losses 83 106 231 283 (18) (2) 296 387 Depreciation and amortization expense 58 62 59 67 44 47 161 176 Other noninterest expense 1,943 1,938 1,258 1,213 (46) 35 3,155 3,186 Income (loss) from continuing operations before income taxes (TE) 256 280 887 930 (1,001) (84) 142 1,126 Allocated income taxes and TE adjustments 61 67 176 196 (176) (36) 61 227 Income (loss) from continuing operations 195 213 711 734 (825) (48) 81 899 Income (loss) from discontinued operations, net of taxes — — — — 2 3 2 3 Net income (loss) $ 195 $ 213 $ 711 $ 734 $ (823) $ (45) $ 83 $ 902 AVERAGE BALANCES (b) Loans and leases $ 39,139 $ 42,118 $ 69,105 $ 76,816 $ 494 $ 437 $ 108,738 $ 119,371 Total assets (a) 41,966 44,945 78,234 86,727 66,491 61,551 186,691 193,223 Deposits 85,305 82,535 57,467 53,983 2,182 7,198 144,954 143,716 OTHER FINANCIAL DATA Net loan charge-offs (b) $ 144 $ 93 $ 200 $ 76 (18) (1) $ 326 $ 168 Return on average allocated equity (b) 7.64 % 8.04 % 9.50 % 9.37 % (68.90) % (713.06) % 0.72 % 8.57 % Return on average allocated equity 7.64 8.04 9.50 9.37 (68.74) (668.50) 0.74 8.60 Average full-time equivalent employees (c) 7,360 7,850 2,347 2,530 7,027 7,500 16,734 17,880 (a) Substantially all revenue generated by our major business segments is derived from clients that reside in the United States. Substantially all long-lived assets, including premises and equipment, capitalized software, and goodwill held by our major business segments, are located in the United States. (b) From continuing operations. (c) The number of average full-time equivalent employees was not adjusted for discontinued operations.

Revenue from Contracts with C_2

Revenue from Contracts with Customers (Tables)	9 Months Ended
	Sep. 30, 2024
Revenue from Contract with Customer [Abstract]
Schedule of Disaggregation of Revenue	The following table represents a disaggregation of revenue from contracts with customers, by business segment, for the three- and nine-month periods ended September 30, 2024, and September 30, 2023. The development and application of the methodologies that we use to allocate items among our business segments is a dynamic process. Accordingly, financial results may be revised periodically to reflect enhanced alignment of expense base allocations drivers, changes in the risk profile of a particular business, or changes in our organizational structure. Three months ended September 30, 2024 Three months ended September 30, 2023 Dollars in millions Consumer Bank Commercial Bank Total Contract Revenue Consumer Bank Commercial Bank Total Contract Revenue NONINTEREST INCOME Trust and investment services income $ 114 $ 17 $ 131 $ 104 $ 16 $ 120 Investment banking and debt placement fees — 128 128 — 70 70 Services charges on deposit accounts 35 32 67 41 28 69 Cards and payments income 45 45 90 43 42 85 Other noninterest income 3 — 3 3 — 3 Total revenue from contracts with customers $ 197 $ 222 $ 419 $ 191 $ 156 $ 347 Other noninterest income (a) $ 219 $ 257 Noninterest income from Other (b) (907) 39 Total noninterest income $ (269) $ 643 (a) Noninterest income considered earned outside the scope of contracts with customers. (b) Other includes other segments that consists of corporate treasury, our principal investing unit, and various exit portfolios as well as reconciling items which primarily represents the unallocated portion of nonearning assets of corporate support functions. Charges related to the funding of these assets are part of net interest income and are allocated to the business segments through noninterest expense. Reconciling items also includes intercompany eliminations and certain items that are not allocated to the business segments because they do not reflect their normal operations. Refer to Note 20 (“Business Segment Reporting”) for more information. Nine months ended September 30, 2024 Nine months ended September 30, 2023 Dollars in millions Consumer Bank Commercial Bank Total Contract Revenue Consumer Bank Commercial Bank Total Contract Revenue NONINTEREST INCOME Trust and investment services income $ 334 $ 51 $ 385 $ 306 $ 50 $ 356 Investment banking and debt placement fees — 357 357 — 261 261 Services charges on deposit accounts 103 93 196 121 84 205 Cards and payments income 133 114 247 136 107 243 Other noninterest income 10 — 10 9 — 9 Total revenue from contracts with customers $ 580 $ 615 $ 1,195 $ 572 $ 502 $ 1,074 Other noninterest income (a) $ 661 $ 714 Noninterest income from Other(b) (851) 72 Total noninterest income $ 1,005 $ 1,860

Earnings Per Common Share (Deta

Earnings Per Common Share (Details) - 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
Income (loss) from continuing operations		$ (411)	$ 302	$ 81	$ 899
Less: Dividends on Preferred Stock		36	36	108	108
Income (loss) from continuing operations attributable to Key common shareholders		(447)	266	(27)	791
Income (loss) from discontinued operations, net of taxes		1	1	2	3
Net income (loss) attributable to Key common shareholders		$ (446)	$ 267	$ (25)	$ 794
WEIGHTED-AVERAGE COMMON SHARES
Weighted-average Common Shares outstanding (in shares)		948,979	927,131	936,962	927,019
Effect of Common Share options and other stock awards (in shares)	[1]	0	4,613	0	5,213
Weighted-average Common Shares and potential Common Shares outstanding (in shares)	[2]	948,979	931,744	936,962	932,232
EARNINGS PER COMMON SHARE
Income (loss) from continuing operations attributable to Key common shareholders (in usd per share)		$ (0.47)	$ 0.29	$ (0.03)	$ 0.85
Income (loss) from discontinued operations, net of taxes (in usd per share)		0	0	0	0
Net income (loss) attributable to Key common shareholders (in usd per share)	[3]	(0.47)	0.29	(0.03)	0.86
Income (loss) from continuing operations attributable to Key common shareholders - assuming dilution (in usd per share)		(0.47)	0.29	(0.03)	0.85
Income (loss) from discontinued operations, net of taxes - assuming dilution (in usd per share)		0	0	0	0
Net income (loss) attributable to Key common shareholders (in usd per share)	[3]	$ (0.47)	$ 0.29	$ (0.03)	$ 0.85
[1] For periods ended in a loss from continuing operations attributable to Key common shareholders, anti-dilutive instruments have been excluded from the calculation of diluted earnings per share. Assumes conversion of Common Share options and other stock awards and/or convertible preferred stock, as applicable. EPS may not foot due to rounding.

Loan Portfolio (Details)

Loan Portfolio (Details) - USD ($)	Sep. 30, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 105,346,000,000	$ 112,606,000,000
Accrued interest	480,000,000	522,000,000
Discontinued operations | Education Lending
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	272,000,000	339,000,000
Total commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	72,417,000,000	77,591,000,000
Accrued interest	344,000,000	383,000,000
Total commercial loans | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	52,774,000,000	55,815,000,000
Total commercial loans | Commercial and industrial | Collateral Pledged
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	261,000,000	0
Total commercial loans | Total commercial real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	16,730,000,000	18,253,000,000
Total commercial loans | Commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	13,637,000,000	15,187,000,000
Total commercial loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	3,093,000,000	3,066,000,000
Total commercial loans | Commercial lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	2,913,000,000	3,523,000,000
Total commercial loans | Commercial lease financing | Collateral Pledged
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	3,000,000	7,000,000
Total commercial loans | Credit cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	219,000,000	207,000,000
Total consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	32,929,000,000	35,015,000,000
Accrued interest	135,000,000	139,000,000
Total consumer loans | Total residential — prime loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	26,677,000,000	28,097,000,000
Total consumer loans | Real estate — residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	20,122,000,000	20,958,000,000
Total consumer loans | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	6,555,000,000	7,139,000,000
Total consumer loans | Other consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	5,338,000,000	5,916,000,000
Total consumer loans | Credit cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	914,000,000	1,002,000,000
Total consumer loans | Credit cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 914,000,000	$ 1,002,000,000

Asset Quality - Schedule of Cha

Asset Quality - Schedule of Changes in Allowance for Loan and Lease Losses by Loan Category (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 1,547	$ 1,480	$ 1,508	$ 1,337
Provision	101	79	312	319
Charge-offs	(167)	(87)	(395)	(223)
Recoveries	13	16	69	55
Ending balance	1,494	1,488	1,494	1,488
Total ALLL, including discontinued operations, beginning balance	1,561	1,498	1,524	1,358
Total provision, including discontinued operations	101	78	311	317
Total charge-offs, including discontinued operations	(168)	(87)	(398)	(226)
Total recoveries, including discontinued operations	13	16	70	56
Total ALLL, including discontinued operations, ending balance	1,507	1,505	1,507	1,505
Provision (credit) for losses on lending-related commitments	(6)	2	(16)	68
Total commercial loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	1,160	986	1,060	864
Provision	80	82	304	268
Charge-offs	(138)	(63)	(307)	(154)
Recoveries	8	11	53	38
Ending balance	1,110	1,016	1,110	1,016
Total consumer loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	387	494	448	473
Provision	21	(3)	8	51
Charge-offs	(29)	(24)	(88)	(69)
Recoveries	5	5	16	17
Ending balance	384	472	384	472
Commercial and Industrial | Total commercial loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	682	599	556	601
Provision	101	29	336	81
Charge-offs	(131)	(62)	(279)	(139)
Recoveries	7	10	46	33
Ending balance	659	576	659	576
Total commercial real estate loans | Total commercial loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	449	354	471	231
Provision	(21)	55	(29)	191
Charge-offs	(7)	(1)	(22)	(15)
Recoveries	1	0	2	1
Ending balance	422	408	422	408
Real estate — commercial mortgage | Total commercial loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	383	315	419	203
Provision	(19)	46	(41)	171
Charge-offs	(7)	(1)	(22)	(15)
Recoveries	1	0	2	1
Ending balance	358	360	358	360
Real estate — construction | Total commercial loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	66	39	52	28
Provision	(2)	9	12	20
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Ending balance	64	48	64	48
Commercial lease financing | Total commercial loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	29	33	33	32
Provision	0	(2)	(3)	(4)
Charge-offs	0	0	(6)	0
Recoveries	0	1	5	4
Ending balance	29	32	29	32
Real estate — residential mortgage | Total consumer loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	115	200	162	196
Provision	(5)	(20)	(53)	(17)
Charge-offs	0	0	(2)	(1)
Recoveries	1	1	4	3
Ending balance	111	181	111	181
Home equity loans | Total consumer loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	71	96	86	98
Provision	1	(5)	(14)	(6)
Charge-offs	(1)	(1)	(2)	(4)
Recoveries	1	1	2	3
Ending balance	72	91	72	91
Other consumer loans | Total consumer loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	128	126	122	113
Provision	15	11	49	42
Charge-offs	(17)	(14)	(49)	(37)
Recoveries	2	2	6	7
Ending balance	128	125	128	125
Credit cards | Total consumer loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	73	72	78	66
Provision	10	11	26	32
Charge-offs	(11)	(9)	(35)	(27)
Recoveries	1	1	4	4
Ending balance	73	75	73	75
Discontinued operations
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	14	18	16	21
Provision	0	(1)	(1)	(2)
Charge-offs	(1)	0	(3)	(3)
Recoveries	0	0	1	1
Ending balance	$ 13	$ 17	$ 13	$ 17

Asset Quality - Narrative (Deta

Asset Quality - Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) loan	Sep. 30, 2023 USD ($) loan	Dec. 31, 2023 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of carrying amount of our commercial nonperforming loans outstanding (as a percent)	83%		83%
Percentage of nonperforming loans outstanding face value (as a percent)	86%		86%
Percentage of loans held for sale and other nonperforming assets (as a percent)	89%		89%
Net reduction to interest income	$ 14	$ 10	$ 41	$ 26
Contractually current percentage of nonperforming loans	37%		37%		41%
Financial receivable, modifications, subsequent default, recorded investment	$ 30	3	$ 48	10
Loan restructuring trial modifications amount			430	262
Commitments outstanding to lend additional funds	29	$ 67	$ 29	$ 67
Trial Modification Plans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loan modifications | loan			110	115
Loan restructuring trial modifications amount			$ 19	$ 17
Non-performing Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonperforming loans on nonaccrual status with no allowance	370		370		$ 301
Total commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivable, modifications, subsequent default, recorded investment	30		47
Loan restructuring trial modifications amount			400	242
Total commercial loans | Continuing Operations
Accounts, Notes, Loans and Financing Receivable [Line Items]
Decrease in ALLL	$ 50
Decrease in ALLL (as a percent)	4.30%
Total consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivable, modifications, subsequent default, recorded investment	$ 0		1
Loan restructuring trial modifications amount			30	20
Total consumer loans | Real Estate Residential Mortgage and Home Equity Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivable, modifications, subsequent default, recorded investment			$ 73	$ 92
Total consumer loans | Continuing Operations
Accounts, Notes, Loans and Financing Receivable [Line Items]
Decrease in ALLL	$ 3
Decrease in ALLL (as a percent)	0.80%

Asset Quality - Schedule of Com

Asset Quality - Schedule of Commercial Credit Exposure (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 105,346	$ 112,606
Accrued interest	480	522
Total commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current	5,252	6,150
Writeoff, current period		1
One year prior	5,715	16,998
Writeoff, one year period		8
Two years prior	14,259	11,508
Writeoff, two year period		36
Three years prior	8,606	4,178
Writeoff, three year period		19
Four years prior	3,296	4,375
Writeoff, four year period		13
Prior	9,296	7,448
Writeoff, prior		42
Revolving Loans Amortized Cost Basis	25,783	26,721
Writeoff, Revolving Loans Amortized Cost Basis		108
Revolving Loans Converted to Term Loans Amortized Cost Basis	210	213
Revolving Loans Converted to Term Loans Amortized Cost Basis, writeoff		0
Total	72,417	77,591
Writeoff, total		227
Accrued interest	344	383
Total commercial loans | Commercial and Industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Current	4,313	4,118
Writeoff, current period		1
One year prior	3,573	10,555
Writeoff, one year period		7
Two years prior	8,382	6,618
Writeoff, two year period		35
Three years prior	4,786	2,774
Writeoff, three year period		8
Four years prior	2,159	2,219
Writeoff, four year period		11
Prior	4,547	3,774
Writeoff, prior		21
Revolving Loans Amortized Cost Basis	24,859	25,619
Writeoff, Revolving Loans Amortized Cost Basis		105
Revolving Loans Converted to Term Loans Amortized Cost Basis	155	138
Revolving Loans Converted to Term Loans Amortized Cost Basis, writeoff		0
Total	52,774	55,815
Writeoff, total		188
Total commercial loans | Commercial and Industrial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current	4,215	4,020
One year prior	3,330	10,145
Two years prior	7,612	6,141
Three years prior	4,309	2,539
Four years prior	1,895	2,064
Prior	4,090	3,534
Revolving Loans Amortized Cost Basis	22,943	24,395
Revolving Loans Converted to Term Loans Amortized Cost Basis	117	123
Total	48,511	52,961
Total commercial loans | Commercial and Industrial | Criticized (Accruing)
Financing Receivable, Credit Quality Indicator [Line Items]
Current	76	84
One year prior	224	361
Two years prior	664	427
Three years prior	442	233
Four years prior	261	127
Prior	414	170
Revolving Loans Amortized Cost Basis	1,779	1,140
Revolving Loans Converted to Term Loans Amortized Cost Basis	38	15
Total	3,898	2,557
Total commercial loans | Commercial and Industrial | Criticized (Nonaccruing)
Financing Receivable, Credit Quality Indicator [Line Items]
Current	22	14
One year prior	19	49
Two years prior	106	50
Three years prior	35	2
Four years prior	3	28
Prior	43	70
Revolving Loans Amortized Cost Basis	137	84
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	365	297
Total commercial loans | Commercial and Industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Writeoff, current period	0
Writeoff, one year period	6
Writeoff, two year period	40
Writeoff, three year period	105
Writeoff, four year period	4
Writeoff, prior	25
Writeoff, Revolving Loans Amortized Cost Basis	99
Revolving Loans Converted to Term Loans Amortized Cost Basis, writeoff	0
Writeoff, total	279
Total commercial loans | Real estate — commercial mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Current	642	1,090
Writeoff, current period	0	0
One year prior	874	4,310
Writeoff, one year period	0	1
Two years prior	3,887	3,334
Writeoff, two year period	0	1
Three years prior	2,787	822
Writeoff, three year period	0	11
Four years prior	718	1,738
Writeoff, four year period	0	2
Prior	3,787	2,755
Writeoff, prior	21	21
Revolving Loans Amortized Cost Basis	889	1,071
Writeoff, Revolving Loans Amortized Cost Basis	1	3
Revolving Loans Converted to Term Loans Amortized Cost Basis	53	67
Revolving Loans Converted to Term Loans Amortized Cost Basis, writeoff	0	0
Total	13,637	15,187
Writeoff, total	22	39
Total commercial loans | Real estate — commercial mortgage | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current	623	1,084
One year prior	808	3,664
Two years prior	3,127	2,922
Three years prior	2,344	804
Four years prior	629	1,545
Prior	3,338	2,507
Revolving Loans Amortized Cost Basis	865	1,017
Revolving Loans Converted to Term Loans Amortized Cost Basis	42	66
Total	11,776	13,609
Total commercial loans | Real estate — commercial mortgage | Criticized (Accruing)
Financing Receivable, Credit Quality Indicator [Line Items]
Current	19	6
One year prior	66	646
Two years prior	705	411
Three years prior	372	15
Four years prior	87	186
Prior	406	193
Revolving Loans Amortized Cost Basis	22	20
Revolving Loans Converted to Term Loans Amortized Cost Basis	11	1
Total	1,688	1,478
Total commercial loans | Real estate — commercial mortgage | Criticized (Nonaccruing)
Financing Receivable, Credit Quality Indicator [Line Items]
Current	0	0
One year prior	0	0
Two years prior	55	1
Three years prior	71	3
Four years prior	2	7
Prior	43	55
Revolving Loans Amortized Cost Basis	2	34
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	173	100
Total commercial loans | Real estate — construction
Financing Receivable, Credit Quality Indicator [Line Items]
Current	60	411
Writeoff, current period	0	0
One year prior	773	1,225
Writeoff, one year period	0	0
Two years prior	1,288	972
Writeoff, two year period	0	0
Three years prior	608	221
Writeoff, three year period	0	0
Four years prior	156	103
Writeoff, four year period	0	0
Prior	171	95
Writeoff, prior	0	0
Revolving Loans Amortized Cost Basis	35	31
Writeoff, Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	2	8
Revolving Loans Converted to Term Loans Amortized Cost Basis, writeoff	0	0
Total	3,093	3,066
Writeoff, total	0	0
Total commercial loans | Real estate — construction | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current	60	401
One year prior	757	1,185
Two years prior	1,172	912
Three years prior	466	157
Four years prior	88	62
Prior	93	48
Revolving Loans Amortized Cost Basis	35	31
Revolving Loans Converted to Term Loans Amortized Cost Basis	2	8
Total	2,673	2,804
Total commercial loans | Real estate — construction | Criticized (Accruing)
Financing Receivable, Credit Quality Indicator [Line Items]
Current	0	10
One year prior	16	40
Two years prior	116	60
Three years prior	142	64
Four years prior	68	41
Prior	78	47
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	420	262
Total commercial loans | Real estate — construction | Criticized (Nonaccruing)
Financing Receivable, Credit Quality Indicator [Line Items]
Current	0	0
One year prior	0	0
Two years prior	0	0
Three years prior	0	0
Four years prior	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	0	0
Total commercial loans | Commercial lease financing
Financing Receivable, Credit Quality Indicator [Line Items]
Current	237	531
Writeoff, current period	0	0
One year prior	495	908
Writeoff, one year period	0	0
Two years prior	702	584
Writeoff, two year period	0	0
Three years prior	425	361
Writeoff, three year period	0	0
Four years prior	263	315
Writeoff, four year period	0	0
Prior	791	824
Writeoff, prior	6	0
Revolving Loans Amortized Cost Basis		0
Writeoff, Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis, writeoff	0	0
Total	2,913	3,523
Writeoff, total	6	0
Total commercial loans | Commercial lease financing | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current	235	520
One year prior	465	878
Two years prior	685	575
Three years prior	415	352
Four years prior	255	307
Prior	777	808
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	2,832	3,440
Total commercial loans | Commercial lease financing | Criticized (Accruing)
Financing Receivable, Credit Quality Indicator [Line Items]
Current	2	11
One year prior	30	30
Two years prior	17	9
Three years prior	10	9
Four years prior	8	8
Prior	14	16
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	81	83
Total commercial loans | Commercial lease financing | Criticized (Nonaccruing)
Financing Receivable, Credit Quality Indicator [Line Items]
Current	0	0
One year prior	0	0
Two years prior	0	0
Three years prior	0	0
Four years prior	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	0	$ 0
Total commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Writeoff, current period	0
Writeoff, one year period	6
Writeoff, two year period	40
Writeoff, three year period	105
Writeoff, four year period	4
Writeoff, prior	52
Writeoff, Revolving Loans Amortized Cost Basis	100
Revolving Loans Converted to Term Loans Amortized Cost Basis, writeoff	0
Writeoff, total	$ 307

Asset Quality - Schedule of Con

Asset Quality - Schedule of Consumer Credit Exposure (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 105,346	$ 112,606
Accrued interest	480	522
Total consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current	415	1,295
Writeoff, current year	1	0
One year prior	1,201	8,602
Writeoff, one year	5	12
Two years prior	8,269	12,343
Writeoff, two year	13	10
Three years prior	10,698	4,151
Writeoff, three year	9	6
Four years prior	4,050	1,277
Writeoff, four year	5	5
Prior	3,477	2,131
Writeoff, prior	7	6
Revolving Loans Amortized Cost Basis	4,437	4,747
Writeoff, Revolving Loans Amortized Cost Basis	48	51
Revolving Loans Converted to Term Loans Amortized Cost Basis	382	469
Revolving Loans Converted to Term Loans Amortized Cost Basis, writeoff	0	1
Total	32,929	35,015
Writeoff, total	88	91
Accrued interest	135	139
Total consumer loans | Real estate — residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Current	214	877
Writeoff, current year	1	0
One year prior	828	6,790
Writeoff, one year	0	0
Two years prior	6,497	8,622
Writeoff, two year	0	0
Three years prior	8,052	2,663
Writeoff, three year	0	0
Four years prior	2,520	693
Writeoff, four year	0	0
Prior	2,010	1,311
Writeoff, prior	1	1
Revolving Loans Amortized Cost Basis	1	2
Writeoff, Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis, writeoff	0	0
Total	20,122	20,958
Writeoff, total	2	1
Total consumer loans | Real estate — residential mortgage | 750 and above
Financing Receivable, Credit Quality Indicator [Line Items]
Current	159	680
One year prior	692	5,992
Two years prior	5,786	7,785
Three years prior	7,290	2,392
Four years prior	2,275	586
Prior	1,566	923
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	17,768	18,358
Total consumer loans | Real estate — residential mortgage | 660 to 749
Financing Receivable, Credit Quality Indicator [Line Items]
Current	52	180
One year prior	119	739
Two years prior	628	780
Three years prior	697	248
Four years prior	218	90
Prior	289	240
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	2,003	2,277
Total consumer loans | Real estate — residential mortgage | Less than 660
Financing Receivable, Credit Quality Indicator [Line Items]
Current	2	15
One year prior	15	58
Two years prior	82	56
Three years prior	64	22
Four years prior	26	17
Prior	140	130
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	329	298
Total consumer loans | Real estate — residential mortgage | No Score
Financing Receivable, Credit Quality Indicator [Line Items]
Current	1	2
One year prior	2	1
Two years prior	1	1
Three years prior	1	1
Four years prior	1	0
Prior	15	18
Revolving Loans Amortized Cost Basis	1	2
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	22	25
Total consumer loans | Home equity loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current	41	29
Writeoff, current year	0
One year prior	58	163
Writeoff, one year	0
Two years prior	212	1,842
Writeoff, two year	0
Three years prior	1,029	614
Writeoff, three year	0
Four years prior	795	197
Writeoff, four year	0
Prior	1,044	620
Writeoff, prior	1
Revolving Loans Amortized Cost Basis	2,994	3,205
Writeoff, Revolving Loans Amortized Cost Basis	1
Revolving Loans Converted to Term Loans Amortized Cost Basis	382	469
Revolving Loans Converted to Term Loans Amortized Cost Basis, writeoff	0
Total	6,555	7,139
Writeoff, total	2
Total consumer loans | Home equity loans | 750 and above
Financing Receivable, Credit Quality Indicator [Line Items]
Current	26	0
One year prior	33	85
Two years prior	142	1,575
Three years prior	798	435
Four years prior	631	114
Prior	758	378
Revolving Loans Amortized Cost Basis	1,926	2,034
Revolving Loans Converted to Term Loans Amortized Cost Basis	269	331
Total	4,583	4,952
Total consumer loans | Home equity loans | 660 to 749
Financing Receivable, Credit Quality Indicator [Line Items]
Current	14	24
One year prior	20	65
Two years prior	54	229
Three years prior	191	152
Four years prior	134	66
Prior	198	164
Revolving Loans Amortized Cost Basis	792	886
Revolving Loans Converted to Term Loans Amortized Cost Basis	88	107
Total	1,491	1,693
Total consumer loans | Home equity loans | Less than 660
Financing Receivable, Credit Quality Indicator [Line Items]
Current	1	3
One year prior	5	13
Two years prior	16	38
Three years prior	40	27
Four years prior	30	17
Prior	87	77
Revolving Loans Amortized Cost Basis	272	281
Revolving Loans Converted to Term Loans Amortized Cost Basis	25	31
Total	476	487
Total consumer loans | Home equity loans | No Score
Financing Receivable, Credit Quality Indicator [Line Items]
Current	0	2
One year prior	0	0
Two years prior	0	0
Three years prior	0	0
Four years prior	0	0
Prior	1	1
Revolving Loans Amortized Cost Basis	4	4
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	5	7
Total consumer loans | Home equity loans
Financing Receivable, Credit Quality Indicator [Line Items]
Writeoff, current year		(1)
Writeoff, one year		0
Writeoff, two year		0
Writeoff, three year		0
Writeoff, four year		0
Writeoff, prior		2
Writeoff, Revolving Loans Amortized Cost Basis		0
Revolving Loans Converted to Term Loans Amortized Cost Basis, writeoff		1
Writeoff, total		2
Total consumer loans | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current	160	389
Writeoff, current year	0	1
One year prior	315	1,649
Writeoff, one year	5	12
Two years prior	1,560	1,879
Writeoff, two year	13	10
Three years prior	1,617	874
Writeoff, three year	9	6
Four years prior	735	387
Writeoff, four year	5	5
Prior	423	200
Writeoff, prior	5	3
Revolving Loans Amortized Cost Basis	528	538
Writeoff, Revolving Loans Amortized Cost Basis	12	14
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis, writeoff	0	0
Total	5,338	5,916
Writeoff, total	49	51
Total consumer loans | Other consumer loans | 750 and above
Financing Receivable, Credit Quality Indicator [Line Items]
Current	76	185
One year prior	157	1,187
Two years prior	1,192	1,455
Three years prior	1,258	660
Four years prior	560	277
Prior	268	112
Revolving Loans Amortized Cost Basis	90	97
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	3,601	3,973
Total consumer loans | Other consumer loans | 660 to 749
Financing Receivable, Credit Quality Indicator [Line Items]
Current	51	150
One year prior	115	365
Two years prior	291	342
Three years prior	284	171
Four years prior	137	83
Prior	113	60
Revolving Loans Amortized Cost Basis	185	199
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	1,176	1,370
Total consumer loans | Other consumer loans | Less than 660
Financing Receivable, Credit Quality Indicator [Line Items]
Current	7	24
One year prior	25	64
Two years prior	60	65
Three years prior	59	32
Four years prior	31	17
Prior	28	16
Revolving Loans Amortized Cost Basis	56	57
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	266	275
Total consumer loans | Other consumer loans | No Score
Financing Receivable, Credit Quality Indicator [Line Items]
Current	26	30
One year prior	18	33
Two years prior	17	17
Three years prior	16	11
Four years prior	7	10
Prior	14	12
Revolving Loans Amortized Cost Basis	197	185
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	295	298
Total consumer loans | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Current	0	0
Writeoff, current year	0	0
One year prior	0	0
Writeoff, one year	0	0
Two years prior	0	0
Writeoff, two year	0	0
Three years prior	0	0
Writeoff, three year	0	0
Four years prior	0	0
Writeoff, four year	0	0
Prior	0	0
Writeoff, prior	0	0
Revolving Loans Amortized Cost Basis	914	1,002
Writeoff, Revolving Loans Amortized Cost Basis	35	37
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis, writeoff	0	0
Total	914	1,002
Writeoff, total	35	37
Total consumer loans | Credit cards | 750 and above
Financing Receivable, Credit Quality Indicator [Line Items]
Current	0	0
One year prior	0	0
Two years prior	0	0
Three years prior	0	0
Four years prior	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	438	489
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	438	489
Total consumer loans | Credit cards | 660 to 749
Financing Receivable, Credit Quality Indicator [Line Items]
Current	0	0
One year prior	0	0
Two years prior	0	0
Three years prior	0	0
Four years prior	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	368	400
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	368	400
Total consumer loans | Credit cards | Less than 660
Financing Receivable, Credit Quality Indicator [Line Items]
Current	0	0
One year prior	0	0
Two years prior	0	0
Three years prior	0	0
Four years prior	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	107	112
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	107	112
Total consumer loans | Credit cards | No Score
Financing Receivable, Credit Quality Indicator [Line Items]
Current	0	0
One year prior	0	0
Two years prior	0	0
Three years prior	0	0
Four years prior	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	1	1
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	$ 1	$ 1

Asset Quality - Schedule of Agi

Asset Quality - Schedule of Aging Analysis of Past Due and Current Loans (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Financing Receivable, Past Due [Line Items]
Total loans	$ 105,346	$ 112,606
Accrued interest	480	522
Total commercial loans
Financing Receivable, Past Due [Line Items]
Total loans	72,417	77,591
Accrued interest	344	383
Total consumer loans
Financing Receivable, Past Due [Line Items]
Total loans	32,929	35,015
Accrued interest	135	139
Non-performing Loans
Financing Receivable, Past Due [Line Items]
Total loans	728	574
Non-performing Loans | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total loans	541	397
Non-performing Loans | Total consumer loans
Financing Receivable, Past Due [Line Items]
Total loans	187	177
Current
Financing Receivable, Past Due [Line Items]
Total loans	104,268	111,703
Current | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total loans	71,631	76,988
Current | Total consumer loans
Financing Receivable, Past Due [Line Items]
Total loans	32,637	34,715
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	115	156
30-59 Days Past Due | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total loans	64	90
30-59 Days Past Due | Total consumer loans
Financing Receivable, Past Due [Line Items]
Total loans	51	66
60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	69	66
60-89 Days Past Due | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total loans	41	34
60-89 Days Past Due | Total consumer loans
Financing Receivable, Past Due [Line Items]
Total loans	28	32
90 and Greater Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	166	107
90 and Greater Days Past Due | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total loans	140	82
90 and Greater Days Past Due | Total consumer loans
Financing Receivable, Past Due [Line Items]
Total loans	26	25
Total Past Due and Non-performing Loans
Financing Receivable, Past Due [Line Items]
Total loans	1,078	903
Total Past Due and Non-performing Loans | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total loans	786	603
Total Past Due and Non-performing Loans | Total consumer loans
Financing Receivable, Past Due [Line Items]
Total loans	292	300
Commercial and industrial | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total loans	52,774	55,815
Commercial and industrial | Non-performing Loans | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total loans	365	297
Commercial and industrial | Current | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total loans	52,258	55,354
Commercial and industrial | 30-59 Days Past Due | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total loans	41	62
Commercial and industrial | 60-89 Days Past Due | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total loans	37	30
Commercial and industrial | 90 and Greater Days Past Due | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total loans	73	72
Commercial and industrial | Total Past Due and Non-performing Loans | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total loans	516	461
Total commercial real estate loans | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total loans	16,730	18,253
Total commercial real estate loans | Non-performing Loans | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total loans	176	100
Total commercial real estate loans | Current | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total loans	16,460	18,114
Total commercial real estate loans | 30-59 Days Past Due | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total loans	23	26
Total commercial real estate loans | 60-89 Days Past Due | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total loans	4	3
Total commercial real estate loans | 90 and Greater Days Past Due | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total loans	67	10
Total commercial real estate loans | Total Past Due and Non-performing Loans | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total loans	270	139
Commercial mortgage | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total loans	13,637	15,187
Commercial mortgage | Non-performing Loans | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total loans	176	100
Commercial mortgage | Current | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total loans	13,369	15,049
Commercial mortgage | Current | Total commercial loans | Government National Mortgage Association (GNMA)
Financing Receivable, Past Due [Line Items]
Total loans	100
Commercial mortgage | 30-59 Days Past Due | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total loans	23	25
Commercial mortgage | 60-89 Days Past Due | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total loans	4	3
Commercial mortgage | 90 and Greater Days Past Due | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total loans	65	10
Commercial mortgage | Total Past Due and Non-performing Loans | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total loans	268	138
Construction | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total loans	3,093	3,066
Construction | Non-performing Loans | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total loans	0	0
Construction | Current | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total loans	3,091	3,065
Construction | 30-59 Days Past Due | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total loans	0	1
Construction | 60-89 Days Past Due | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total loans	0	0
Construction | 90 and Greater Days Past Due | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total loans	2	0
Construction | Total Past Due and Non-performing Loans | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total loans	2	1
Commercial lease financing | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total loans	2,913	3,523
Commercial lease financing | Non-performing Loans | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total loans	0	0
Commercial lease financing | Current | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total loans	2,913	3,520
Commercial lease financing | 30-59 Days Past Due | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total loans	0	2
Commercial lease financing | 60-89 Days Past Due | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total loans	0	1
Commercial lease financing | 90 and Greater Days Past Due | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total loans	0	0
Commercial lease financing | Total Past Due and Non-performing Loans | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total loans	0	3
Real estate — residential mortgage | Total consumer loans
Financing Receivable, Past Due [Line Items]
Total loans	20,122	20,958
Real estate — residential mortgage | Non-performing Loans | Total consumer loans
Financing Receivable, Past Due [Line Items]
Total loans	87	71
Real estate — residential mortgage | Current | Total commercial loans | Government National Mortgage Association (GNMA)
Financing Receivable, Past Due [Line Items]
Total loans	5
Real estate — residential mortgage | Current | Total consumer loans
Financing Receivable, Past Due [Line Items]
Total loans	20,022	20,863
Real estate — residential mortgage | 30-59 Days Past Due | Total consumer loans
Financing Receivable, Past Due [Line Items]
Total loans	7	17
Real estate — residential mortgage | 60-89 Days Past Due | Total consumer loans
Financing Receivable, Past Due [Line Items]
Total loans	6	7
Real estate — residential mortgage | 90 and Greater Days Past Due | Total consumer loans
Financing Receivable, Past Due [Line Items]
Total loans	0	0
Real estate — residential mortgage | Total Past Due and Non-performing Loans | Total consumer loans
Financing Receivable, Past Due [Line Items]
Total loans	100	95
Home equity loans | Total consumer loans
Financing Receivable, Past Due [Line Items]
Total loans	6,555	7,139
Home equity loans | Non-performing Loans | Total consumer loans
Financing Receivable, Past Due [Line Items]
Total loans	90	97
Home equity loans | Current | Total consumer loans
Financing Receivable, Past Due [Line Items]
Total loans	6,431	7,001
Home equity loans | 30-59 Days Past Due | Total consumer loans
Financing Receivable, Past Due [Line Items]
Total loans	22	27
Home equity loans | 60-89 Days Past Due | Total consumer loans
Financing Receivable, Past Due [Line Items]
Total loans	8	10
Home equity loans | 90 and Greater Days Past Due | Total consumer loans
Financing Receivable, Past Due [Line Items]
Total loans	4	4
Home equity loans | Total Past Due and Non-performing Loans | Total consumer loans
Financing Receivable, Past Due [Line Items]
Total loans	124	138
Other consumer loans | Total consumer loans
Financing Receivable, Past Due [Line Items]
Total loans	5,338	5,916
Other consumer loans | Non-performing Loans | Total consumer loans
Financing Receivable, Past Due [Line Items]
Total loans	4	4
Other consumer loans | Current | Total consumer loans
Financing Receivable, Past Due [Line Items]
Total loans	5,299	5,877
Other consumer loans | 30-59 Days Past Due | Total consumer loans
Financing Receivable, Past Due [Line Items]
Total loans	16	16
Other consumer loans | 60-89 Days Past Due | Total consumer loans
Financing Receivable, Past Due [Line Items]
Total loans	9	10
Other consumer loans | 90 and Greater Days Past Due | Total consumer loans
Financing Receivable, Past Due [Line Items]
Total loans	10	9
Other consumer loans | Total Past Due and Non-performing Loans | Total consumer loans
Financing Receivable, Past Due [Line Items]
Total loans	39	39
Credit cards | Total commercial loans
Financing Receivable, Past Due [Line Items]
Total loans	219	207
Credit cards | Total consumer loans
Financing Receivable, Past Due [Line Items]
Total loans	914	1,002
Credit cards | Non-performing Loans | Total consumer loans
Financing Receivable, Past Due [Line Items]
Total loans	6	5
Credit cards | Current | Total consumer loans
Financing Receivable, Past Due [Line Items]
Total loans	885	974
Credit cards | 30-59 Days Past Due | Total consumer loans
Financing Receivable, Past Due [Line Items]
Total loans	6	6
Credit cards | 60-89 Days Past Due | Total consumer loans
Financing Receivable, Past Due [Line Items]
Total loans	5	5
Credit cards | 90 and Greater Days Past Due | Total consumer loans
Financing Receivable, Past Due [Line Items]
Total loans	12	12
Credit cards | Total Past Due and Non-performing Loans | Total consumer loans
Financing Receivable, Past Due [Line Items]
Total loans	$ 29	$ 28

Asset Quality - Schedule of Mod

Asset Quality - Schedule of Modifications for Borrowers Experiencing Financial Difficulty (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 430	$ 262
Amortized Cost Basis (as a percent)	0.41%	0.23%
Interest Rate Reduction
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 32	$ 2
Term Extension
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	344	166
Other
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	15	47
Combination
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	39	47
Total commercial real estate loans | Commercial and Industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 153	$ 235
Amortized Cost Basis (as a percent)	0.29%	0.41%
Total commercial real estate loans | Commercial and Industrial | Interest Rate Reduction
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 0	$ 0
Total commercial real estate loans | Commercial and Industrial | Term Extension
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	126	158
Total commercial real estate loans | Commercial and Industrial | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	11	46
Total commercial real estate loans | Commercial and Industrial | Combination
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	16	31
Total commercial real estate loans | Total commercial real estate loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 247	$ 7
Amortized Cost Basis (as a percent)	1.48%	0.04%
Total commercial real estate loans | Total commercial real estate loans | Interest Rate Reduction
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 28	$ 0
Total commercial real estate loans | Total commercial real estate loans | Term Extension
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	216	7
Total commercial real estate loans | Total commercial real estate loans | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	3	0
Total commercial real estate loans | Total commercial real estate loans | Combination
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	0	0
Total commercial real estate loans | Commercial mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 220	$ 7
Amortized Cost Basis (as a percent)	1.61%	0.05%
Total commercial real estate loans | Commercial mortgage | Interest Rate Reduction
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 28	$ 0
Total commercial real estate loans | Commercial mortgage | Term Extension
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	189	7
Total commercial real estate loans | Commercial mortgage | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	3	0
Total commercial real estate loans | Commercial mortgage | Combination
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	0	0
Total commercial real estate loans | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 27	$ 0
Amortized Cost Basis (as a percent)	0.87%	0%
Total commercial real estate loans | Construction | Interest Rate Reduction
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 0	$ 0
Total commercial real estate loans | Construction | Term Extension
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	27	0
Total commercial real estate loans | Construction | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	0	0
Total commercial real estate loans | Construction | Combination
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	0	0
Total commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 400	$ 242
Amortized Cost Basis (as a percent)	0.55%	0.30%
Total commercial loans | Interest Rate Reduction
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 28	$ 0
Total commercial loans | Term Extension
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	342	165
Total commercial loans | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	14	46
Total commercial loans | Combination
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	16	31
Total commercial loans | Commercial lease financing
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 0	$ 0
Amortized Cost Basis (as a percent)	0%	0%
Total commercial loans | Commercial lease financing | Interest Rate Reduction
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 0	$ 0
Total commercial loans | Commercial lease financing | Term Extension
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	0	0
Total commercial loans | Commercial lease financing | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	0	0
Total commercial loans | Commercial lease financing | Combination
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	0	0
Total consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 30	$ 20
Amortized Cost Basis (as a percent)	0.09%	0.06%
Total consumer loans | Interest Rate Reduction
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 4	$ 2
Total consumer loans | Term Extension
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	2	1
Total consumer loans | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	1	1
Total consumer loans | Combination
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	23	16
Total consumer loans | Real estate — residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 12	$ 8
Amortized Cost Basis (as a percent)	0.06%	0.04%
Total consumer loans | Real estate — residential mortgage | Interest Rate Reduction
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 1	$ 1
Total consumer loans | Real estate — residential mortgage | Term Extension
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	0	0
Total consumer loans | Real estate — residential mortgage | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	0
Total consumer loans | Real estate — residential mortgage | Combination
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	11	7
Total consumer loans | Home equity loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 11	$ 7
Amortized Cost Basis (as a percent)	0.17%	0.10%
Total consumer loans | Home equity loans | Interest Rate Reduction
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 3	$ 1
Total consumer loans | Home equity loans | Term Extension
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	1	0
Total consumer loans | Home equity loans | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	1	1
Total consumer loans | Home equity loans | Combination
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	6	5
Total consumer loans | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 3	$ 2
Amortized Cost Basis (as a percent)	0.06%	0.03%
Total consumer loans | Other consumer loans | Interest Rate Reduction
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 0	$ 0
Total consumer loans | Other consumer loans | Term Extension
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	1	1
Total consumer loans | Other consumer loans | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	0	0
Total consumer loans | Other consumer loans | Combination
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	2	1
Total consumer loans | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 4	$ 3
Amortized Cost Basis (as a percent)	0.44%	0.30%
Total consumer loans | Credit cards | Interest Rate Reduction
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 0	$ 0
Total consumer loans | Credit cards | Term Extension
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	0	0
Total consumer loans | Credit cards | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	0	0
Total consumer loans | Credit cards | Combination
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis	$ 4	$ 3

Asset Quality - Schedule of Fin

Asset Quality - Schedule of Financial Effects of Modifications to Borrowers Experiencing Financial Difficulty (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Total commercial real estate loans | Commercial and Industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-average Interest Rate Change	(17.00%)	0.21%	(6.29%)	0.34%
Weighted-average Term Extension (in years)	5 months 1 day	10 months 6 days	1 year 1 month 20 days	6 months 14 days
Total commercial real estate loans | Commercial mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-average Interest Rate Change	0%		(1.91%)	0%
Weighted-average Term Extension (in years)	5 months 4 days		2 months 12 days	1 year 29 days
Total commercial real estate loans | Construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-average Interest Rate Change			0%
Weighted-average Term Extension (in years)			3 years 2 months 12 days
Total consumer loans | Real estate — residential mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-average Interest Rate Change	(1.85%)	(1.55%)	(1.73%)	(2.03%)
Weighted-average Term Extension (in years)	2 years 5 months 19 days	12 years 2 months 26 days	5 years 9 months 7 days	7 years 6 months 21 days
Total consumer loans | Home equity loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-average Interest Rate Change	(4.68%)	(3.71%)	(3.75%)	(4.13%)
Weighted-average Term Extension (in years)	5 years 7 months 6 days	5 years 6 months 21 days	6 years 5 months 8 days	6 years 1 month 24 days
Total consumer loans | Other consumer loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-average Interest Rate Change	(4.18%)	(4.65%)	(3.90%)	(4.38%)
Weighted-average Term Extension (in years)	4 months 24 days	1 year 3 months 25 days	7 months 13 days	11 months 26 days
Total consumer loans | Credit cards
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-average Interest Rate Change	(12.13%)	(11.52%)	(15.21%)	(14.05%)
Weighted-average Term Extension (in years)	3 months	9 months	9 months	9 months

Asset Quality - Schedule of Amo

Asset Quality - Schedule of Amortized Cost Basis of Modified Loans That Subsequently Defaulted (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivable, modifications, subsequent default, recorded investment	$ 30	$ 3	$ 48	$ 10
Interest Rate Reduction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivable, modifications, subsequent default, recorded investment	28		28
Term Extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivable, modifications, subsequent default, recorded investment	1		17
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivable, modifications, subsequent default, recorded investment	0		0
Combination
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivable, modifications, subsequent default, recorded investment	1		3
Total commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivable, modifications, subsequent default, recorded investment	30		47
Total commercial loans | Interest Rate Reduction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivable, modifications, subsequent default, recorded investment	28		28
Total commercial loans | Term Extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivable, modifications, subsequent default, recorded investment	1		17
Total commercial loans | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivable, modifications, subsequent default, recorded investment	0		0
Total commercial loans | Combination
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivable, modifications, subsequent default, recorded investment	1		2
Total commercial loans | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivable, modifications, subsequent default, recorded investment	1		18
Total commercial loans | Commercial and Industrial | Interest Rate Reduction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivable, modifications, subsequent default, recorded investment	0		0
Total commercial loans | Commercial and Industrial | Term Extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivable, modifications, subsequent default, recorded investment	1		17
Total commercial loans | Commercial and Industrial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivable, modifications, subsequent default, recorded investment	0		0
Total commercial loans | Commercial and Industrial | Combination
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivable, modifications, subsequent default, recorded investment	0		1
Total commercial real estate loans | Total commercial real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivable, modifications, subsequent default, recorded investment	29		29
Total commercial real estate loans | Total commercial real estate loans | Interest Rate Reduction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivable, modifications, subsequent default, recorded investment	28		28
Total commercial real estate loans | Total commercial real estate loans | Term Extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivable, modifications, subsequent default, recorded investment	0		0
Total commercial real estate loans | Total commercial real estate loans | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivable, modifications, subsequent default, recorded investment	0		0
Total commercial real estate loans | Total commercial real estate loans | Combination
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivable, modifications, subsequent default, recorded investment	1		1
Total commercial real estate loans | Commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivable, modifications, subsequent default, recorded investment	29		29
Total commercial real estate loans | Commercial mortgage | Interest Rate Reduction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivable, modifications, subsequent default, recorded investment	28		28
Total commercial real estate loans | Commercial mortgage | Term Extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivable, modifications, subsequent default, recorded investment	0		0
Total commercial real estate loans | Commercial mortgage | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivable, modifications, subsequent default, recorded investment	0
Total commercial real estate loans | Commercial mortgage | Combination
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivable, modifications, subsequent default, recorded investment	1		1
Total commercial real estate loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivable, modifications, subsequent default, recorded investment	0		0
Total commercial real estate loans | Construction | Interest Rate Reduction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivable, modifications, subsequent default, recorded investment	0		0
Total commercial real estate loans | Construction | Term Extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivable, modifications, subsequent default, recorded investment	0		0
Total commercial real estate loans | Construction | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivable, modifications, subsequent default, recorded investment	0		0
Total commercial real estate loans | Construction | Combination
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivable, modifications, subsequent default, recorded investment	0		0
Total consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivable, modifications, subsequent default, recorded investment	0		1
Total consumer loans | Interest Rate Reduction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivable, modifications, subsequent default, recorded investment	0		0
Total consumer loans | Term Extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivable, modifications, subsequent default, recorded investment	0		0
Total consumer loans | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivable, modifications, subsequent default, recorded investment	0		0
Total consumer loans | Combination
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivable, modifications, subsequent default, recorded investment	0		1
Total consumer loans | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivable, modifications, subsequent default, recorded investment	0		1
Total consumer loans | Home equity loans | Interest Rate Reduction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivable, modifications, subsequent default, recorded investment	0		0
Total consumer loans | Home equity loans | Term Extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivable, modifications, subsequent default, recorded investment	0		0
Total consumer loans | Home equity loans | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivable, modifications, subsequent default, recorded investment	0		0
Total consumer loans | Home equity loans | Combination
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivable, modifications, subsequent default, recorded investment	$ 0		$ 1

Asset Quality - Schedule of Per

Asset Quality - Schedule of Performance of Loans That Have Been Modified in the Last 12 Months (Details) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023
Financing Receivable, Past Due [Line Items]
Total loans modified in last 12 months	$ 430	$ 262
Current
Financing Receivable, Past Due [Line Items]
Total loans modified in last 12 months	373	258
30-89 Days  Past Due
Financing Receivable, Past Due [Line Items]
Total loans modified in last 12 months	22	1
90 and Greater Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans modified in last 12 months	35	3
Total commercial loans
Financing Receivable, Past Due [Line Items]
Total loans modified in last 12 months	400	242
Total commercial loans | Current
Financing Receivable, Past Due [Line Items]
Total loans modified in last 12 months	348	238
Total commercial loans | 30-89 Days  Past Due
Financing Receivable, Past Due [Line Items]
Total loans modified in last 12 months	18	1
Total commercial loans | 90 and Greater Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans modified in last 12 months	34	3
Total commercial loans | Commercial and Industrial
Financing Receivable, Past Due [Line Items]
Total loans modified in last 12 months	153	235
Total commercial loans | Commercial and Industrial | Current
Financing Receivable, Past Due [Line Items]
Total loans modified in last 12 months	132	231
Total commercial loans | Commercial and Industrial | 30-89 Days  Past Due
Financing Receivable, Past Due [Line Items]
Total loans modified in last 12 months	18	1
Total commercial loans | Commercial and Industrial | 90 and Greater Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans modified in last 12 months	3	3
Total commercial loans | Total commercial real estate loans
Financing Receivable, Past Due [Line Items]
Total loans modified in last 12 months	400	242
Total commercial loans | Total commercial real estate loans | Current
Financing Receivable, Past Due [Line Items]
Total loans modified in last 12 months	348	238
Total commercial loans | Total commercial real estate loans | 30-89 Days  Past Due
Financing Receivable, Past Due [Line Items]
Total loans modified in last 12 months	18	1
Total commercial loans | Total commercial real estate loans | 90 and Greater Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans modified in last 12 months	34	3
Total commercial loans | Commercial mortgage
Financing Receivable, Past Due [Line Items]
Total loans modified in last 12 months	220	7
Total commercial loans | Commercial mortgage | Current
Financing Receivable, Past Due [Line Items]
Total loans modified in last 12 months	189	7
Total commercial loans | Commercial mortgage | 30-89 Days  Past Due
Financing Receivable, Past Due [Line Items]
Total loans modified in last 12 months	0	0
Total commercial loans | Commercial mortgage | 90 and Greater Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans modified in last 12 months	31	0
Total commercial loans | Construction
Financing Receivable, Past Due [Line Items]
Total loans modified in last 12 months	27	0
Total commercial loans | Construction | Current
Financing Receivable, Past Due [Line Items]
Total loans modified in last 12 months	27	0
Total commercial loans | Construction | 30-89 Days  Past Due
Financing Receivable, Past Due [Line Items]
Total loans modified in last 12 months	0	0
Total commercial loans | Construction | 90 and Greater Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans modified in last 12 months	0	0
Total commercial loans | Commercial lease financing
Financing Receivable, Past Due [Line Items]
Total loans modified in last 12 months	0	0
Total commercial loans | Commercial lease financing | Current
Financing Receivable, Past Due [Line Items]
Total loans modified in last 12 months	0	0
Total commercial loans | Commercial lease financing | 30-89 Days  Past Due
Financing Receivable, Past Due [Line Items]
Total loans modified in last 12 months	0	0
Total commercial loans | Commercial lease financing | 90 and Greater Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans modified in last 12 months	0	0
Total consumer loans
Financing Receivable, Past Due [Line Items]
Total loans modified in last 12 months	30	20
Total consumer loans | Current
Financing Receivable, Past Due [Line Items]
Total loans modified in last 12 months	25	20
Total consumer loans | 30-89 Days  Past Due
Financing Receivable, Past Due [Line Items]
Total loans modified in last 12 months	4	0
Total consumer loans | 90 and Greater Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans modified in last 12 months	1	0
Total consumer loans | Real estate — residential mortgage
Financing Receivable, Past Due [Line Items]
Total loans modified in last 12 months	12	8
Total consumer loans | Real estate — residential mortgage | Current
Financing Receivable, Past Due [Line Items]
Total loans modified in last 12 months	9	8
Total consumer loans | Real estate — residential mortgage | 30-89 Days  Past Due
Financing Receivable, Past Due [Line Items]
Total loans modified in last 12 months	3	0
Total consumer loans | Real estate — residential mortgage | 90 and Greater Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans modified in last 12 months	0	0
Total consumer loans | Home equity loans
Financing Receivable, Past Due [Line Items]
Total loans modified in last 12 months	11	7
Total consumer loans | Home equity loans | Current
Financing Receivable, Past Due [Line Items]
Total loans modified in last 12 months	9	7
Total consumer loans | Home equity loans | 30-89 Days  Past Due
Financing Receivable, Past Due [Line Items]
Total loans modified in last 12 months	1	0
Total consumer loans | Home equity loans | 90 and Greater Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans modified in last 12 months	1	0
Total consumer loans | Other consumer loans
Financing Receivable, Past Due [Line Items]
Total loans modified in last 12 months	3	2
Total consumer loans | Other consumer loans | Current
Financing Receivable, Past Due [Line Items]
Total loans modified in last 12 months	3	2
Total consumer loans | Other consumer loans | 30-89 Days  Past Due
Financing Receivable, Past Due [Line Items]
Total loans modified in last 12 months	0	0
Total consumer loans | Other consumer loans | 90 and Greater Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans modified in last 12 months	0	0
Total consumer loans | Credit cards
Financing Receivable, Past Due [Line Items]
Total loans modified in last 12 months	4	3
Total consumer loans | Credit cards | Current
Financing Receivable, Past Due [Line Items]
Total loans modified in last 12 months	4	3
Total consumer loans | Credit cards | 30-89 Days  Past Due
Financing Receivable, Past Due [Line Items]
Total loans modified in last 12 months	0	0
Total consumer loans | Credit cards | 90 and Greater Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans modified in last 12 months	$ 0	$ 0

Asset Quality - Schedule of C_2

Asset Quality - Schedule of Changes in Liability for Credit Losses on Lending Related Commitments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period	$ 286	$ 291	$ 296	$ 225
Provision (credit) for losses on off balance sheet exposures	(6)	2	(16)	68
Other	0	(3)	0	(3)
Balance at end of period	$ 280	$ 290	$ 280	$ 290

Fair Value Measurements - Sched

Fair Value Measurements - Schedule of Fair Value of Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	$ 1,404	$ 1,142
Total securities available for sale	34,169	37,185
Loans, net of unearned income (residential)	105,346	112,606
Netting adjustments	(499)	(818)
Total derivative assets	191	181
LIABILITIES MEASURED ON A RECURRING BASIS
Netting adjustments	(343)	(473)
U.S. Treasury, agencies and corporations
ASSETS MEASURED ON A RECURRING BASIS
Total securities available for sale	9,223	9,026
Agency residential mortgage-backed securities
ASSETS MEASURED ON A RECURRING BASIS
Total securities available for sale	7,321	3,589
Agency commercial mortgage-backed securities
ASSETS MEASURED ON A RECURRING BASIS
Total securities available for sale	4,634	9,092
Level 3 | Other
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets	1
Recurring
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	1,399	1,139
Commercial loans	5	3
Total trading account assets	1,404	1,142
Total securities available for sale	34,169	37,185
Total other investments	73	63
Loans, net of unearned income (residential)	9	9
Loans held for sale (residential)	61	51
Derivative assets	690	999
Netting adjustments	(499)	(818)
Total derivative assets	191	181
Total assets on a recurring basis at fair value	35,907	38,631
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities	1,183	1,777
Netting adjustments	(343)	(473)
Total derivative liabilities	840	1,304
Total liabilities on a recurring basis at fair value	1,699	2,108
Recurring | Short positions
LIABILITIES MEASURED ON A RECURRING BASIS
Short positions	859	804
Recurring | Interest rate
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets	186	173
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities	695	985
Recurring | Foreign exchange
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets	70	89
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities	63	73
Recurring | Commodity
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets	423	721
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities	401	698
Recurring | Credit
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets	0	0
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities	17	1
Recurring | Other
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets	11	16
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities	7	20
Recurring | Agency residential collateralized mortgage obligations
ASSETS MEASURED ON A RECURRING BASIS
Total securities available for sale	12,991	15,478
Recurring | Other mortgage-backed securities
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	355	340
Recurring | U.S. Treasury, agencies and corporations
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	928	685
Total securities available for sale	9,223	9,026
Recurring | States and political subdivisions
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	102	93
Recurring | Agency residential mortgage-backed securities | Other mortgage-backed securities
ASSETS MEASURED ON A RECURRING BASIS
Total securities available for sale	7,321	3,589
Recurring | Agency commercial mortgage-backed securities
ASSETS MEASURED ON A RECURRING BASIS
Total securities available for sale	4,634	9,092
Recurring | Other securities
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	14	21
Total securities available for sale	0	0
Recurring | Principal Investments
ASSETS MEASURED ON A RECURRING BASIS
Total other investments	16	17
Recurring | Direct
ASSETS MEASURED ON A RECURRING BASIS
Total other investments	0	0
Recurring | Equity Investments
ASSETS MEASURED ON A RECURRING BASIS
Total other investments	57	46
Recurring | Equity Investments, Direct
ASSETS MEASURED ON A RECURRING BASIS
Total other investments	9	2
Recurring | Level 1
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	0	0
Commercial loans	0	0
Total trading account assets	0	0
Total securities available for sale	0	0
Total other investments	0	0
Loans, net of unearned income (residential)	0	0
Loans held for sale (residential)	0	0
Derivative assets	48	74
Netting adjustments	0	0
Total derivative assets	48	74
Total assets on a recurring basis at fair value	48	74
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities	41	58
Netting adjustments	0	0
Total derivative liabilities	41	58
Total liabilities on a recurring basis at fair value	120	88
Recurring | Level 1 | Short positions
LIABILITIES MEASURED ON A RECURRING BASIS
Short positions	79	30
Recurring | Level 1 | Interest rate
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets	0	0
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities	1	0
Recurring | Level 1 | Foreign exchange
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets	48	74
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities	40	58
Recurring | Level 1 | Commodity
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets	0	0
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities	0	0
Recurring | Level 1 | Credit
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets	0	0
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities	0	0
Recurring | Level 1 | Other
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets	0	0
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities	0	0
Recurring | Level 1 | Agency residential collateralized mortgage obligations
ASSETS MEASURED ON A RECURRING BASIS
Total securities available for sale	0	0
Recurring | Level 1 | Other mortgage-backed securities
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	0	0
Recurring | Level 1 | U.S. Treasury, agencies and corporations
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	0	0
Total securities available for sale	0	0
Recurring | Level 1 | States and political subdivisions
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	0	0
Recurring | Level 1 | Agency residential mortgage-backed securities | Other mortgage-backed securities
ASSETS MEASURED ON A RECURRING BASIS
Total securities available for sale	0	0
Recurring | Level 1 | Agency commercial mortgage-backed securities
ASSETS MEASURED ON A RECURRING BASIS
Total securities available for sale	0	0
Recurring | Level 1 | Other securities
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	0	0
Total securities available for sale	0	0
Recurring | Level 1 | Principal Investments
ASSETS MEASURED ON A RECURRING BASIS
Total other investments	0	0
Recurring | Level 1 | Direct
ASSETS MEASURED ON A RECURRING BASIS
Total other investments	0	0
Recurring | Level 1 | Equity Investments
ASSETS MEASURED ON A RECURRING BASIS
Total other investments	0	0
Recurring | Level 1 | Equity Investments, Direct
ASSETS MEASURED ON A RECURRING BASIS
Total other investments	0	0
Recurring | Level 2
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	1,399	1,139
Commercial loans	5	3
Total trading account assets	1,404	1,142
Total securities available for sale	34,169	37,185
Total other investments	6	0
Loans, net of unearned income (residential)	0	0
Loans held for sale (residential)	61	51
Derivative assets	634	925
Netting adjustments	0	0
Total derivative assets	634	925
Total assets on a recurring basis at fair value	36,274	39,303
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities	1,142	1,719
Netting adjustments	0	0
Total derivative liabilities	1,142	1,719
Total liabilities on a recurring basis at fair value	1,922	2,493
Recurring | Level 2 | Short positions
LIABILITIES MEASURED ON A RECURRING BASIS
Short positions	780	774
Recurring | Level 2 | Interest rate
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets	179	175
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities	694	985
Recurring | Level 2 | Foreign exchange
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets	22	15
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities	23	15
Recurring | Level 2 | Commodity
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets	423	721
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities	401	698
Recurring | Level 2 | Credit
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets	0	0
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities	17	1
Recurring | Level 2 | Other
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets	10	14
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities	7	20
Recurring | Level 2 | Agency residential collateralized mortgage obligations
ASSETS MEASURED ON A RECURRING BASIS
Total securities available for sale	12,991	15,478
Recurring | Level 2 | Other mortgage-backed securities
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	355	340
Recurring | Level 2 | U.S. Treasury, agencies and corporations
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	928	685
Total securities available for sale	9,223	9,026
Recurring | Level 2 | States and political subdivisions
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	102	93
Recurring | Level 2 | Agency residential mortgage-backed securities | Other mortgage-backed securities
ASSETS MEASURED ON A RECURRING BASIS
Total securities available for sale	7,321	3,589
Recurring | Level 2 | Agency commercial mortgage-backed securities
ASSETS MEASURED ON A RECURRING BASIS
Total securities available for sale	4,634	9,092
Recurring | Level 2 | Other securities
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	14	21
Total securities available for sale	0	0
Recurring | Level 2 | Principal Investments
ASSETS MEASURED ON A RECURRING BASIS
Total other investments	0	0
Recurring | Level 2 | Direct
ASSETS MEASURED ON A RECURRING BASIS
Total other investments	0	0
Recurring | Level 2 | Equity Investments
ASSETS MEASURED ON A RECURRING BASIS
Total other investments	6	0
Recurring | Level 2 | Equity Investments, Direct
ASSETS MEASURED ON A RECURRING BASIS
Total other investments	6	0
Recurring | Level 3
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	0	0
Commercial loans	0	0
Total trading account assets	0	0
Total securities available for sale	0	0
Total other investments	3	2
Loans, net of unearned income (residential)	9	9
Loans held for sale (residential)	0	0
Derivative assets	8	0
Netting adjustments	0	0
Total derivative assets	8	0
Total assets on a recurring basis at fair value	20	11
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities	0	0
Netting adjustments	0	0
Total derivative liabilities	0	0
Total liabilities on a recurring basis at fair value	0	0
Recurring | Level 3 | Short positions
LIABILITIES MEASURED ON A RECURRING BASIS
Short positions	0	0
Recurring | Level 3 | Interest rate
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets	7	(2)
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities	0	0
Recurring | Level 3 | Foreign exchange
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets	0	0
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities	0	0
Recurring | Level 3 | Commodity
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets	0	0
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities	0	0
Recurring | Level 3 | Credit
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets	0	0
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities	0	0
Recurring | Level 3 | Other
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets		2
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities	0	0
Recurring | Level 3 | Agency residential collateralized mortgage obligations
ASSETS MEASURED ON A RECURRING BASIS
Total securities available for sale	0	0
Recurring | Level 3 | Other mortgage-backed securities
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	0	0
Recurring | Level 3 | U.S. Treasury, agencies and corporations
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	0	0
Total securities available for sale	0	0
Recurring | Level 3 | States and political subdivisions
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	0	0
Recurring | Level 3 | Agency residential mortgage-backed securities | Other mortgage-backed securities
ASSETS MEASURED ON A RECURRING BASIS
Total securities available for sale	0	0
Recurring | Level 3 | Agency commercial mortgage-backed securities
ASSETS MEASURED ON A RECURRING BASIS
Total securities available for sale	0	0
Recurring | Level 3 | Other securities
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	0	0
Total securities available for sale	0	0
Recurring | Level 3 | Principal Investments
ASSETS MEASURED ON A RECURRING BASIS
Total other investments	0	0
Recurring | Level 3 | Direct
ASSETS MEASURED ON A RECURRING BASIS
Total other investments	0	0
Recurring | Level 3 | Equity Investments
ASSETS MEASURED ON A RECURRING BASIS
Total other investments	3	2
Recurring | Level 3 | Equity Investments, Direct
ASSETS MEASURED ON A RECURRING BASIS
Total other investments	3	2
Recurring | Measured at NAV | Indirect investments | Variable Interest Entity, Not Primary Beneficiary
ASSETS MEASURED ON A RECURRING BASIS
Total other investments	16	17
Recurring | Measured at NAV | Equity Investments Direct, NAV
ASSETS MEASURED ON A RECURRING BASIS
Total other investments	45	40
Recurring | Measured at NAV | Equity Investments Indirect, NAV
ASSETS MEASURED ON A RECURRING BASIS
Total other investments	$ 3	$ 4

Fair Value Measurements - Sch_2

Fair Value Measurements - Schedule of Fair Value of Direct and Indirect Investments, Related Unfunded Commitments and Financial Support Provided (Details) - Principal Investments - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	$ 16		$ 16
Unfunded Commit-ments	1		1
Funded Commit-ments	0	$ 0	0	$ 0
Funded Other	0	0	0	0
Direct investments
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	0		0
Unfunded Commit-ments	0		0
Funded Commit-ments	0	0	0	0
Funded Other	0	0	0	0
Indirect investments (measured at NAV)
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	16		16
Unfunded Commit-ments	1		1
Funded Commit-ments	0	0	0	0
Funded Other	$ 0	$ 0	$ 0	$ 0

Fair Value Measurements - Sch_3

Fair Value Measurements - Schedule of Change in Fair Values of Level 3 Financial Instruments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning of Period Balance	$ 2	$ 2	$ 2	$ 2
Gains (Losses) Included in Other Comprehensive Income	0	0	0	0
Gains (Losses) Included in Earnings	1	0	1	0
Purchases	0	0	0	0
Sales	0	0	0	0
Settlements	0	0	0	0
Transfers Other	0	0	0	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
End of Period Balance	3	2	3	2
Unrealized Gains (Losses) Included in Earnings	0	0	0	0
Direct
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning of Period Balance		1		1
Gains (Losses) Included in Other Comprehensive Income		0		0
Gains (Losses) Included in Earnings		0		0
Purchases		0		0
Sales		0		0
Settlements		0		0
Transfers Other		0		0
Transfers into Level 3		0		0
Transfers out of Level 3		0		0
End of Period Balance		1		1
Unrealized Gains (Losses) Included in Earnings		0		0
Interest rate
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning of Period Balance	(2)	5	(2)	2
Gains (Losses) Included in Other Comprehensive Income	0	0	0	0
Gains (Losses) Included in Earnings	2	(6)	(5)	(23)
Purchases	6	0	7	18
Sales	0	0	0	1
Settlements	0	0	0	0
Transfers Other	0	0	0	0
Transfers into Level 3	1	0	2	(3)
Transfers out of Level 3	0	2	5	6
End of Period Balance	7	1	7	1
Unrealized Gains (Losses) Included in Earnings	0	0	0	0
Credit
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning of Period Balance		0		(2)
Gains (Losses) Included in Other Comprehensive Income		0		0
Gains (Losses) Included in Earnings		0		0
Purchases		0		0
Sales		0
Settlements		0		0
Transfers Other		0		0
Transfers into Level 3		0		0
Transfers out of Level 3		0
End of Period Balance		0		0
Unrealized Gains (Losses) Included in Earnings		0		0
Other
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning of Period Balance	1	1	2	0
Gains (Losses) Included in Other Comprehensive Income	0	0	0	0
Gains (Losses) Included in Earnings	0	0	0	0
Purchases	0	0	0	0
Sales	0	0	0	0
Settlements	0	0	0	0
Transfers Other	0	(2)	(1)	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	(1)
End of Period Balance	1	(1)	1	(1)
Unrealized Gains (Losses) Included in Earnings	0	0	0	0
Loans, net of unearned income (residential)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning of Period Balance	11	9	9	9
Gains (Losses) Included in Other Comprehensive Income	0	0	0	0
Gains (Losses) Included in Earnings	0	0	0	0
Purchases	0	0	0	0
Sales	0	0	0	0
Settlements	0	0	0	0
Transfers Other	(2)	0	(2)	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	2	0
End of Period Balance	9	9	9	9
Unrealized Gains (Losses) Included in Earnings	$ 0	$ 0	$ 0	$ 0

Fair Value Measurements - Narra

Fair Value Measurements - Narrative (Details) - USD ($)	3 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other equity investments	$ 386,000,000	$ 339,000,000
Impairment loss	0
Loans, net of allowance	103,852,000,000	111,098,000,000
Fair Value | Education Lending | Discontinued operations
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans, net of allowance	203,000,000	264,000,000
Fair Value | Nonrecurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities measured at fair value on non recurring basis	0	0
Carrying Amount | Education Lending | Discontinued operations
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans, net of allowance	$ 272,000,000	$ 339,000,000

Fair Value Measurements - Sch_4

Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value on Nonrecurring Basis (Details) - Nonrecurring - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
ASSETS MEASURED ON A NONRECURRING BASIS
Collateral-dependent loans	$ 150	$ 104
Accrued income and other assets	25	29
Total assets on a recurring basis at fair value	175	133
Level 1
ASSETS MEASURED ON A NONRECURRING BASIS
Collateral-dependent loans	0	0
Accrued income and other assets	0	0
Total assets on a recurring basis at fair value	0	0
Level 2
ASSETS MEASURED ON A NONRECURRING BASIS
Collateral-dependent loans	0	0
Accrued income and other assets	0	0
Total assets on a recurring basis at fair value	0	0
Level 3
ASSETS MEASURED ON A NONRECURRING BASIS
Collateral-dependent loans	150	104
Accrued income and other assets	25	29
Total assets on a recurring basis at fair value	$ 175	$ 133

Fair Value Measurements - Sch_5

Fair Value Measurements - Schedule of Quantitative Information about Level 3 Fair Value Measurements (Details) $ in Millions	Sep. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)
Fair Value, Option, Quantitative Disclosures [Line Items]
Derivative assets	$ 191	$ 181
Mortgage servicing assets excluded from OREO	12	8
Recurring
Fair Value, Option, Quantitative Disclosures [Line Items]
Derivative assets	191	181
Nonrecurring
Fair Value, Option, Quantitative Disclosures [Line Items]
Collateral-dependent loans	150	104
Level 3 | Recurring
Fair Value, Option, Quantitative Disclosures [Line Items]
Derivative assets	8	0
Insignificant level 3 assets, net of liabilities	4	4
Level 3 | Nonrecurring
Fair Value, Option, Quantitative Disclosures [Line Items]
Collateral-dependent loans	150	104
Market comparable pricing | Level 3 | Recurring
Fair Value, Option, Quantitative Disclosures [Line Items]
Loans, net of unearned income (residential)	$ 9	$ 9
Market comparable pricing | Level 3 | Recurring | Comparability factor | Minimum
Fair Value, Option, Quantitative Disclosures [Line Items]
Loans, net of unearned income (residential), measurement input	0.6171	0.6267
Market comparable pricing | Level 3 | Recurring | Comparability factor | Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
Loans, net of unearned income (residential), measurement input	0.9500	0.8960
Market comparable pricing | Level 3 | Recurring | Comparability factor | Weighted Average
Fair Value, Option, Quantitative Disclosures [Line Items]
Loans, net of unearned income (residential), measurement input	0.7333	0.7083
Discounted cash flow | Level 3 | Recurring | Interest rate
Fair Value, Option, Quantitative Disclosures [Line Items]
Derivative assets	$ 7	$ 2
Discounted cash flow | Level 3 | Recurring | Interest rate | Probability of default | Minimum
Fair Value, Option, Quantitative Disclosures [Line Items]
Derivative assets, measurement input	0.0002	0.0002
Discounted cash flow | Level 3 | Recurring | Interest rate | Probability of default | Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
Derivative assets, measurement input	1	1
Discounted cash flow | Level 3 | Recurring | Interest rate | Probability of default | Weighted Average
Fair Value, Option, Quantitative Disclosures [Line Items]
Derivative assets, measurement input	0.0430	0.0530
Discounted cash flow | Level 3 | Recurring | Interest rate | Loss given default | Minimum
Fair Value, Option, Quantitative Disclosures [Line Items]
Derivative assets, measurement input	0	0
Discounted cash flow | Level 3 | Recurring | Interest rate | Loss given default | Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
Derivative assets, measurement input	1	1
Discounted cash flow | Level 3 | Recurring | Interest rate | Loss given default | Weighted Average
Fair Value, Option, Quantitative Disclosures [Line Items]
Derivative assets, measurement input	0.491	0.477
Fair value of collateral | Level 3 | Nonrecurring
Fair Value, Option, Quantitative Disclosures [Line Items]
Collateral-dependent loans	$ 150	$ 104
Fair value of collateral | Level 3 | Nonrecurring | Credit and liquidity discount | Minimum
Fair Value, Option, Quantitative Disclosures [Line Items]
Collateral-dependent loans, measurement input	0	0
Fair value of collateral | Level 3 | Nonrecurring | Credit and liquidity discount | Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
Collateral-dependent loans, measurement input	1	0.1000
Fair value of collateral | Level 3 | Nonrecurring | Credit and liquidity discount | Weighted Average
Fair Value, Option, Quantitative Disclosures [Line Items]
Collateral-dependent loans, measurement input	0.2300	0.0500
Appraised value | Level 3 | Nonrecurring
Fair Value, Option, Quantitative Disclosures [Line Items]
OREO and other Level 3 assets	$ 13	$ 21

Fair Value Measurements - Sch_6

Fair Value Measurements - Schedule of Fair Value Disclosures of Financial Instruments (Details) - USD ($) $ in Millions		Sep. 30, 2024	Dec. 31, 2023
ASSETS
Trading account assets		$ 1,404	$ 1,142
Derivative assets		191	181
Securities available for sale		34,169	37,185
Held to maturity securities		7,702	8,575
Loans, net of unearned income (residential)		105,346	112,606
Loans held for sale	[1]	1,058	483
LIABILITIES
Long-term debt, carrying amount		15,677	19,554
Carrying Amount
ASSETS
Trading account assets		1,404	1,142
Other investments		1,117	1,244
Loans, net of unearned income (residential)		9	9
Loans held for sale (residential)		61	51
Securities available for sale		34,169	37,185
Held to maturity securities		7,702	8,575
Loans, net of unearned income (residential)		103,843	111,089
Loans held for sale		997	432
Cash and other short-term investments		24,072	11,758
LIABILITIES
Time deposits, carrying amount		18,352	14,776
Short-term borrowings, carrying amount		2,403	3,091
Long-term debt, carrying amount		15,677	19,554
Deposits with no stated maturity		132,001	130,811
Carrying Amount | Derivatives Not Designated as Hedging Instruments
ASSETS
Derivative assets		212	168
LIABILITIES
Derivative liabilities		836	1,304
Carrying Amount | Derivatives Designated as Hedging Instruments
ASSETS
Derivative assets		(21)	13
LIABILITIES
Derivative liabilities		4	0
Fair Value
ASSETS
Trading account assets		1,404	1,142
Other investments		1,117	1,244
Loans, net of unearned income (residential)		9	9
Loans held for sale (residential)		61	51
Securities available for sale		34,169	37,185
Held to maturity securities		7,317	8,056
Loans, net of unearned income (residential)		100,480	105,950
Loans held for sale		997	432
Cash and other short-term investments		24,072	11,758
LIABILITIES
Time deposits, fair value		18,505	14,911
Short-term borrowings, fair value		2,403	3,091
Long-term debt, fair value		15,638	19,008
Deposits with no stated maturity		132,001	130,811
Fair Value | Derivatives Not Designated as Hedging Instruments
ASSETS
Derivative assets		212	168
Derivative assets, Netting Adjustment		(486)	(792)
LIABILITIES
Derivative liabilities		836	1,304
Derivative liabilities, Netting Adjustment		(327)	(461)
Fair Value | Derivatives Designated as Hedging Instruments
ASSETS
Derivative assets		(21)	13
Derivative assets, Netting Adjustment		(13)	(26)
LIABILITIES
Derivative liabilities		4	0
Derivative liabilities, Netting Adjustment		(16)	(12)
Fair Value | Level 1
ASSETS
Trading account assets		0	0
Other investments		0	0
Loans, net of unearned income (residential)		0	0
Loans held for sale (residential)		0	0
Securities available for sale		0	0
Held to maturity securities		0	0
Loans, net of unearned income (residential)		0	0
Loans held for sale		0	0
Cash and other short-term investments		24,072	11,758
LIABILITIES
Time deposits, fair value		0	0
Short-term borrowings, fair value		79	30
Long-term debt, fair value		11,842	11,288
Deposits with no stated maturity		0	0
Fair Value | Level 1 | Derivatives Not Designated as Hedging Instruments
ASSETS
Derivative assets		48	74
LIABILITIES
Derivative liabilities		41	58
Fair Value | Level 1 | Derivatives Designated as Hedging Instruments
ASSETS
Derivative assets		0	0
LIABILITIES
Derivative liabilities		0	0
Fair Value | Level 2
ASSETS
Trading account assets		1,404	1,142
Other investments		6	0
Loans, net of unearned income (residential)		0	0
Loans held for sale (residential)		61	51
Securities available for sale		34,169	37,185
Held to maturity securities		7,317	8,056
Loans, net of unearned income (residential)		0	0
Loans held for sale		0	0
Cash and other short-term investments		0	0
LIABILITIES
Time deposits, fair value		18,505	14,911
Short-term borrowings, fair value		2,324	3,061
Long-term debt, fair value		3,796	7,720
Deposits with no stated maturity		132,001	130,811
Fair Value | Level 2 | Derivatives Not Designated as Hedging Instruments
ASSETS
Derivative assets		642	886
LIABILITIES
Derivative liabilities		1,122	1,707
Fair Value | Level 2 | Derivatives Designated as Hedging Instruments
ASSETS
Derivative assets		(8)	39
LIABILITIES
Derivative liabilities		20	12
Fair Value | Level 3
ASSETS
Trading account assets		0	0
Other investments		1,047	1,183
Loans, net of unearned income (residential)		9	9
Loans held for sale (residential)		0	0
Securities available for sale		0	0
Held to maturity securities		0	0
Loans, net of unearned income (residential)		100,480	105,950
Loans held for sale		997	432
Cash and other short-term investments		0	0
LIABILITIES
Time deposits, fair value		0	0
Short-term borrowings, fair value		0	0
Long-term debt, fair value		0	0
Deposits with no stated maturity		0	0
Fair Value | Level 3 | Derivatives Not Designated as Hedging Instruments
ASSETS
Derivative assets		8	0
LIABILITIES
Derivative liabilities		0	0
Fair Value | Level 3 | Derivatives Designated as Hedging Instruments
ASSETS
Derivative assets		0	0
LIABILITIES
Derivative liabilities		0	0
Fair Value | Measured at NAV
ASSETS
Other investments		$ 64	$ 61
[1] Total loans held for sale include real estate — residential mortgage loans held for sale at fair value of $61 million at September 30, 2024, and $51 million at December 31, 2023.

Securities - Schedule of Detail

Securities - Schedule of Details of Securities (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
SECURITIES AVAILABLE FOR SALE
Amortized Cost	$ 37,613	$ 42,695
Gross Unrealized Gains	127	10
Gross Unrealized Losses	3,571	5,520
Fair Value	34,169	37,185
HELD-TO-MATURITY SECURITIES
Total	7,702	8,575
Gross Unrealized Gains	10	10
Gross Unrealized Losses	395	529
Fair Value	7,317	8,056
Debt securities, available for sale, accrued interest	77	64
Debt securities, held to maturity, accrued interest	22	25
U.S. Treasury, agencies and corporations
SECURITIES AVAILABLE FOR SALE
Amortized Cost	9,156	9,300
Gross Unrealized Gains	97	6
Gross Unrealized Losses	30	280
Fair Value	9,223	9,026
Agency residential collateralized mortgage obligations
SECURITIES AVAILABLE FOR SALE
Amortized Cost	15,647	18,911
Gross Unrealized Gains	7	4
Gross Unrealized Losses	2,663	3,437
Fair Value	12,991	15,478
HELD-TO-MATURITY SECURITIES
Total	4,743	5,170
Gross Unrealized Gains	8	9
Gross Unrealized Losses	218	283
Fair Value	4,533	4,896
Agency residential mortgage-backed securities
SECURITIES AVAILABLE FOR SALE
Amortized Cost	7,808	4,189
Gross Unrealized Gains	23	0
Gross Unrealized Losses	510	600
Fair Value	7,321	3,589
HELD-TO-MATURITY SECURITIES
Total	154	165
Gross Unrealized Gains	0	0
Gross Unrealized Losses	11	13
Fair Value	143	152
Agency commercial mortgage-backed securities
SECURITIES AVAILABLE FOR SALE
Amortized Cost	5,002	10,295
Gross Unrealized Gains	0	0
Gross Unrealized Losses	368	1,203
Fair Value	4,634	9,092
HELD-TO-MATURITY SECURITIES
Total	2,385	2,473
Gross Unrealized Gains	2	1
Gross Unrealized Losses	153	204
Fair Value	2,234	2,270
Asset-backed securities
HELD-TO-MATURITY SECURITIES
Total	394	738
Gross Unrealized Gains	0	0
Gross Unrealized Losses	13	29
Fair Value	381	709
Debt securities, held-to-maturity, purchase of senior notes	388	731
Other securities
HELD-TO-MATURITY SECURITIES
Total	26	29
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	$ 26	$ 29

Securities - Schedule of Availa

Securities - Schedule of Available for Sale Securities in an Unrealized Loss Position (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Held-to-maturity securities:
Temporarily impaired securities, fair value, less than 12 months	$ 5,497	$ 2,055
Temporarily impaired securities, gross unrealized losses, less than 12 months	17	79
Temporarily impaired securities, fair value, 12 months or longer	26,804	41,416
Temporarily impaired securities, gross unrealized losses, 12 months or longer	3,949	5,970
Temporarily impaired securities, fair value	32,301	43,471
Temporarily impaired securities, gross unrealized losses	3,966	6,049
U.S. Treasury, agencies and corporations
Securities available for sale:
Fair value, less than 12 months	3,228	0
Gross unrealized losses, less than 12 months	3	0
Fair value, 12 months or longer	766	8,532
Gross unrealized losses, 12 months or longer	27	280
Fair Value	3,994	8,532
Gross Unrealized Losses	30	280
Agency residential collateralized mortgage obligations
Securities available for sale:
Fair value, less than 12 months	93	0
Gross unrealized losses, less than 12 months	0	0
Fair value, 12 months or longer	11,807	14,979
Gross unrealized losses, 12 months or longer	2,663	3,437
Fair Value	11,900	14,979
Gross Unrealized Losses	2,663	3,437
Held-to-maturity securities:
Fair value, less than 12 months	164	1,123
Gross unrealized losses, less than 12 months	2	30
Fair value, 12 months or longer	3,585	3,070
Gross unrealized losses, 12 months or longer	216	253
Fair Value	3,749	4,193
Gross Unrealized Losses	218	283
Agency residential mortgage-backed securities
Securities available for sale:
Fair value, less than 12 months	2,012	24
Gross unrealized losses, less than 12 months	12	0
Fair value, 12 months or longer	3,369	3,562
Gross unrealized losses, 12 months or longer	498	600
Fair Value	5,381	3,586
Gross Unrealized Losses	510	600
Held-to-maturity securities:
Fair value, less than 12 months	0	0
Gross unrealized losses, less than 12 months	0	0
Fair value, 12 months or longer	143	152
Gross unrealized losses, 12 months or longer	11	13
Fair Value	143	152
Gross Unrealized Losses	11	13
Agency commercial mortgage-backed securities
Securities available for sale:
Fair value, less than 12 months	0	891
Gross unrealized losses, less than 12 months	0	49
Fair value, 12 months or longer	4,583	8,201
Gross unrealized losses, 12 months or longer	368	1,154
Fair Value	4,583	9,092
Gross Unrealized Losses	368	1,203
Held-to-maturity securities:
Fair value, less than 12 months	0	0
Gross unrealized losses, less than 12 months	0	0
Fair value, 12 months or longer	2,162	2,199
Gross unrealized losses, 12 months or longer	153	204
Fair Value	2,162	2,199
Gross Unrealized Losses	153	204
Asset-backed securities
Held-to-maturity securities:
Fair value, less than 12 months	0	0
Gross unrealized losses, less than 12 months	0	0
Fair value, 12 months or longer	381	709
Gross unrealized losses, 12 months or longer	13	29
Fair Value	381	709
Gross Unrealized Losses	13	29
Other securities
Held-to-maturity securities:
Fair value, less than 12 months	0	17
Gross unrealized losses, less than 12 months	0	0
Fair value, 12 months or longer	8	12
Gross unrealized losses, 12 months or longer	0	0
Fair Value	8	29
Gross Unrealized Losses	$ 0	$ 0

Securities - Narrative (Details

Securities - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract]
Gross realized gains	$ 0	$ 0	$ 0	$ 0
Gross realized losses	935,000,000	$ 0	948,000,000	$ 0
Securities pledged to secure securities sold under repurchase agreements	$ 22,900,000,000		$ 22,900,000,000

Securities - Schedule of Securi

Securities - Schedule of Securities by Maturity (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Securities Available for Sale, Amortized Cost
Due in one year or less	$ 2,695
Due after one through five years	12,034
Due after five through ten years	14,339
Due after ten years	8,545
Total	37,613
Securities Available for Sale, Fair Value
Due in one year or less	2,688
Due after one through five years	11,778
Due after five through ten years	12,301
Due after ten years	7,402
Total	34,169	$ 37,185
Held-to-Maturity Securities, Amortized Cost
Due in one year or less	78
Due after one through five years	3,444
Due after five through ten years	2,396
Due after ten years	1,784
Total	7,702	8,575
Held-to-Maturity Securities, Fair Value
Due in one year or less	76
Due after one through five years	3,336
Due after five through ten years	2,257
Due after ten years	1,648
Total	$ 7,317	$ 8,056

Derivatives and Hedging Activ_3

Derivatives and Hedging Activities - Narrative (Details) $ in Millions	9 Months Ended
	Sep. 30, 2024 USD ($) group	Dec. 31, 2023 USD ($)
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative assets after effects of bilateral collateral and master netting agreements	$ 21
Derivative liabilities after effects of bilateral collateral and master netting agreements	4
Derivative assets not designated as hedging instruments after effects of bilateral collateral and master netting agreements, and a reserve for potential future losses	212
Derivative liabilities not designated as hedging instruments after effects of bilateral collateral and master netting agreements, and a reserve for potential future losses	836
Reclassify of after-tax net losses on derivative instruments from AOCI	205
Reclassification of net losses related to terminated cash flow hedges from AOCI to income	$ 17
Maximum length of time over which forecasted transactions are hedged (in years)	3 years 7 months 9 days
Cash collateral netted against derivative assets	$ 218	$ 408
Collateral netted against derivative liabilities	$ 62	64
Number of derivative transactions group | group	2
Gross exposure on derivatives, after taking into account the effects of bilateral collateral and master netting agreements	$ 474
Net exposure on derivatives, after taking into account, the effects of bilateral collateral and master netting agreements	30
Default reserve associated with uncollateralized contracts	7
Gross exposure on derivatives after taking into account effects of master netting agreements	192
Net exposure on derivatives with clients after application of master netting agreements collateral and related reserve	161
Net liability position	$ 2	$ 1

Derivatives and Hedging Activ_4

Derivatives and Hedging Activities - Schedule of Fair Values, Volume of Activity and Gain (Loss) Information Related to Derivative Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Derivatives, Fair Value [Line Items]
Notional Amount	$ 149,589	$ 143,121
Derivative assets, netting adjustments	(499)	(818)
Derivative Assets, net	191	180
Derivative liabilities, netting adjustments	(343)	(473)
Derivative Liabilities, net	838	1,286
Amount of offset in excess of collateral posted	170	161
Amount of offset in excess of securities collateral posted	261	269
Amount of offset in excess of cash collateral held	30	16
Amount of offset in excess of securities collateral held	188	212
Derivatives Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Notional Amount	91,082	98,500
Derivative Assets	698	960
Derivative Liabilities	1,163	1,765
Interest rate | Derivatives Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Notional Amount	58,507	44,621
Derivative Assets	(8)	39
Derivative Liabilities	20	12
Interest rate | Derivatives Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Notional Amount	72,584	78,051
Derivative Assets	194	134
Derivative Liabilities	675	973
Foreign exchange | Derivatives Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Notional Amount	6,383	6,034
Derivative Assets	70	89
Derivative Liabilities	63	73
Commodity | Derivatives Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Notional Amount	8,832	11,611
Derivative Assets	423	721
Derivative Liabilities	401	698
Credit | Derivatives Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Notional Amount	136	121
Derivative Assets	0	0
Derivative Liabilities	17	1
Other | Derivatives Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Notional Amount	3,147	2,683
Derivative Assets	11	16
Derivative Liabilities	7	20
Net derivatives
Derivatives, Fair Value [Line Items]
Notional Amount	149,589	143,121
Derivative Assets, net	191	181
Derivative Liabilities, net	840	1,304
Other collateral
Derivatives, Fair Value [Line Items]
Notional Amount	0	0
Derivative Assets, net	0	(1)
Derivative Liabilities, net	$ (2)	$ (18)

Derivatives and Hedging Activ_5

Derivatives and Hedging Activities - Schedule of Cumulative Basis Adjustments on Fair Value Hedges (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Derivatives, Fair Value [Line Items]
Fair Value	$ 34,169	$ 37,185
Long-term debt | Interest rate
Derivatives, Fair Value [Line Items]
Carrying amount of hedged item	10,500	9,919
Hedge accounting basis adjustment	(240)	(437)
Long-term debt | Interest rate | Derivatives Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Hedge accounting basis adjustment	(5)	(5)
Securities Available for Sale | Interest rate
Derivatives, Fair Value [Line Items]
Carrying amount of hedged item	12,286	8,655
Hedge accounting basis adjustment	(300)	(152)
Fair Value	12,300	12,800
Hedged layer amount	7,200	7,200
Hedged asset portfolio layer method cumulative basis adjustments	$ 195	$ 147

Derivatives and Hedging Activ_6

Derivatives and Hedging Activities - Schedule of Effect of Fair Value and Cash Flow Hedges on Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Interest expense — Long-term debt	$ (292)	$ (351)	$ (952)	$ (975)
Interest income – loans	1,516	1,593	4,578	4,645
Interest Income - securities	298	192	789	580
Investment banking and debt placement fees	171	141	467	406
Net gain (loss) on cash flow hedging relationships
Realized gains (losses) (pre-tax) reclassified from AOCI into net income	(187)	(246)	(602)	(706)
Interest rate | Interest expense – long-term debt | Fair Value Hedging
Net gains (losses) on fair value hedging relationships
Recognized on hedged items	(333)	3	(198)	226
Recognized on derivatives designated as hedging instruments	258	(54)	(22)	(374)
Net income (expense) recognized on fair value hedges	(75)	(51)	(220)	(148)
Interest rate | Interest expense – long-term debt | Cash Flow Hedging
Net gain (loss) on cash flow hedging relationships
Realized gains (losses) (pre-tax) reclassified from AOCI into net income	0	0	(1)	(1)
Net income (expense) recognized on cash flow hedges	0	0	(1)	(1)
Interest rate | Interest income – loans | Fair Value Hedging
Net gains (losses) on fair value hedging relationships
Recognized on hedged items	0	0	0	0
Recognized on derivatives designated as hedging instruments	0	0	0	0
Net income (expense) recognized on fair value hedges	0	0	0	0
Interest rate | Interest income – loans | Cash Flow Hedging
Net gain (loss) on cash flow hedging relationships
Realized gains (losses) (pre-tax) reclassified from AOCI into net income	(184)	(248)	(599)	(708)
Net income (expense) recognized on cash flow hedges	(184)	(248)	(599)	(708)
Interest rate | Interest Income - securities | Fair Value Hedging
Net gains (losses) on fair value hedging relationships
Recognized on hedged items	329	(54)	156	(72)
Recognized on derivatives designated as hedging instruments	(285)	63	(47)	93
Net income (expense) recognized on fair value hedges	44	9	109	21
Interest rate | Interest Income - securities | Cash Flow Hedging
Net gain (loss) on cash flow hedging relationships
Realized gains (losses) (pre-tax) reclassified from AOCI into net income	0	0	0	0
Net income (expense) recognized on cash flow hedges	0	0	0	0
Interest rate | Investment banking and debt placement fees | Fair Value Hedging
Net gains (losses) on fair value hedging relationships
Recognized on hedged items	0	0	0	0
Recognized on derivatives designated as hedging instruments	0	0	0	0
Net income (expense) recognized on fair value hedges	0	0	0	0
Interest rate | Investment banking and debt placement fees | Cash Flow Hedging
Net gain (loss) on cash flow hedging relationships
Realized gains (losses) (pre-tax) reclassified from AOCI into net income	(3)	2	(2)	3
Net income (expense) recognized on cash flow hedges	$ (3)	$ 2	$ (2)	$ 3

Derivatives and Hedging Activ_7

Derivatives and Hedging Activities - Schedule of Derivative Instrument Cash Flow Hedge Earning Recognized by Income Statement Location (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Derivatives, Fair Value [Line Items]
Net Gains (Losses) Recognized in OCI	$ 405	$ (211)	$ 46	$ (571)
Realized gains (losses) (pre-tax) reclassified from AOCI into net income	(187)	(246)	(602)	(706)
Interest income – loans | Interest rate | Cash Flow Hedges
Derivatives, Fair Value [Line Items]
Net Gains (Losses) Recognized in OCI	410	(228)	49	(584)
Realized gains (losses) (pre-tax) reclassified from AOCI into net income	(184)	(248)	(599)	(708)
Interest expense — Long-term debt | Interest rate | Cash Flow Hedges
Derivatives, Fair Value [Line Items]
Net Gains (Losses) Recognized in OCI	0	12	1	8
Realized gains (losses) (pre-tax) reclassified from AOCI into net income	0	0	(1)	(1)
Investment banking and debt placement fees | Interest rate | Cash Flow Hedges
Derivatives, Fair Value [Line Items]
Net Gains (Losses) Recognized in OCI	(5)	5	(4)	5
Realized gains (losses) (pre-tax) reclassified from AOCI into net income	$ (3)	$ 2	$ (2)	$ 3

Derivatives and Hedging Activ_8

Derivatives and Hedging Activities - Schedule of Pre-Tax Net Gains (Losses) on Derivatives Not Designated as Hedging Instruments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	$ 9	$ 22	$ 54	$ 56
Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	11	9	31	33
Foreign exchange
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	13	13	39	39
Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	4	5	9	19
Credit
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	(22)	(12)	(35)	(41)
Other
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	3	7	10	6
Corporate services income
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	25	26	76	93
Corporate services income | Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	8	8	27	33
Corporate services income | Foreign exchange
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	13	13	39	39
Corporate services income | Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	4	5	9	19
Corporate services income | Credit
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	0	0	1	2
Corporate services income | Other
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	0	0	0	0
Consumer mortgage income
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	0	1	1	4
Consumer mortgage income | Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	0	0	0	0
Consumer mortgage income | Foreign exchange
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	0	0	0	0
Consumer mortgage income | Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	0	0	0	0
Consumer mortgage income | Credit
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	0	0	0	0
Consumer mortgage income | Other
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	0	1	1	4
Other income
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	(16)	(6)	(23)	(41)
Other income | Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	3	1	4	0
Other income | Foreign exchange
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	0	0	0	0
Other income | Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	0	0	0	0
Other income | Credit
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	(22)	(12)	(36)	(43)
Other income | Other
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	$ 3	$ 6	$ 9	$ 2

Derivatives and Hedging Activ_9

Derivatives and Hedging Activities - Schedule of Fair Value of Derivative Assets by Type (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Credit Derivatives [Line Items]
Derivative assets before collateral	$ 409	$ 589
Plus(Less): Related collateral	(218)	(408)
Derivative assets	191	181
Interest rate
Credit Derivatives [Line Items]
Derivative assets before collateral	139	123
Foreign exchange
Credit Derivatives [Line Items]
Derivative assets before collateral	22	42
Commodity
Credit Derivatives [Line Items]
Derivative assets before collateral	237	409
Credit
Credit Derivatives [Line Items]
Derivative assets before collateral	0	0
Other
Credit Derivatives [Line Items]
Derivative assets before collateral	$ 11	$ 15

Derivatives and Hedging Acti_10

Derivatives and Hedging Activities - Schedule of Credit Derivatives Sold and Held (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Credit Derivatives [Line Items]
Notional Amount	$ 12	$ 4
Payment / Performance Risk	0%	0%
Other
Credit Derivatives [Line Items]
Notional Amount	$ 12	$ 4
Average Term (Years)	5 years 2 months 26 days	10 years 8 months 8 days
Payment / Performance Risk	2.07%	4.86%

Derivatives and Hedging Acti_11

Derivatives and Hedging Activities - Schedule of Credit Risk Contingent Feature (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Net derivative liabilities with credit-risk contingent features	$ (27)	$ (45)
Collateral posted	$ 26	$ 42

Mortgage Servicing Assets - Sch

Mortgage Servicing Assets - Schedule of Changes in Carrying Amount of Mortgage Servicing Assets (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Commercial Mortgage Backed Securities
Servicing Asset at Amortized Cost, Balance [Roll Forward]
Balance at beginning of period	$ 612	$ 627	$ 638	$ 653
Servicing retained from loan sales	17	40	44	66
Purchases	7	8	17	18
Amortization	(30)	(30)	(93)	(92)
Temporary (impairments) recoveries	0	0	0	0
Balance at end of period	606	645	606	645
Fair value at end of period	816	871	816	871
Agency residential mortgage-backed securities
Servicing Asset at Amortized Cost, Balance [Roll Forward]
Balance at beginning of period	109	106	108	106
Servicing retained from loan sales	4	4	9	8
Purchases	0	0	0	0
Amortization	(3)	(3)	(8)	(7)
Temporary (impairments) recoveries	(2)	0	(1)	0
Balance at end of period	108	107	108	107
Fair value at end of period	$ 129	$ 137	$ 129	$ 137

Mortgage Servicing Assets - S_2

Mortgage Servicing Assets - Schedule of Range and Weighted-Average of Significant Unobservable Inputs (Details) - Discounted cash flow - USD ($)	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Commercial Mortgage Backed Securities | Minimum
Servicing Assets at Fair Value [Line Items]
Expected defaults	1%	1%
Residual cash flows discount rate	7.17%	7.44%
Escrow earn rate	4.51%	5.48%
Loan assumption rate	0%	0%
Commercial Mortgage Backed Securities | Maximum
Servicing Assets at Fair Value [Line Items]
Expected defaults	2%	2%
Residual cash flows discount rate	10.72%	10.50%
Escrow earn rate	4.56%	5.61%
Loan assumption rate	2.36%	2.13%
Commercial Mortgage Backed Securities | Weighted Average
Servicing Assets at Fair Value [Line Items]
Expected defaults	1.01%	1.01%
Residual cash flows discount rate	10.38%	10.13%
Escrow earn rate	4.51%	5.49%
Loan assumption rate	1.99%	1.96%
Agency residential mortgage-backed securities | Minimum
Servicing Assets at Fair Value [Line Items]
Prepayment speed	7.08%	5.24%
Residual cash flows discount rate	6.50%	6.50%
Servicing cost	$ 70	$ 70
Agency residential mortgage-backed securities | Maximum
Servicing Assets at Fair Value [Line Items]
Prepayment speed	53.34%	36.95%
Residual cash flows discount rate	8.75%	8.75%
Servicing cost	$ 3,582	$ 4,332
Agency residential mortgage-backed securities | Weighted Average
Servicing Assets at Fair Value [Line Items]
Prepayment speed	8.33%	6.87%
Residual cash flows discount rate	6.60%	6.59%
Servicing cost	$ 75.25	$ 74.70

Mortgage Servicing Assets - Nar

Mortgage Servicing Assets - Narrative (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Commercial Mortgage Backed Securities
Servicing Assets at Fair Value [Line Items]
Contractual fee income from servicing commercial mortgage loans	$ 284	$ 234
Amortization of servicing commercial mortgage loans	93	92
Residential mortgage-backed securities
Servicing Assets at Fair Value [Line Items]
Contractual fee income from servicing commercial mortgage loans	29	25
Amortization of servicing commercial mortgage loans	$ 8	$ 7

Leases (Details)

Leases (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Sales-type and direct financing leases
Interest income on lease receivable	$ 17	$ 19	$ 53	$ 58
Interest income related to accretion of unguaranteed residual asset	2	3	7	10
Interest income on deferred fees and costs	5	2	15	2
Total sales-type and direct financing lease income	24	24	75	70
Operating leases
Operating lease income related to lease payments	16	19	53	65
Other operating leasing gains	0	3	8	5
Total operating lease income and other leasing gains	16	22	61	70
Total lease income	$ 40	$ 46	$ 136	$ 140

Goodwill - Narrative (Details)

Goodwill - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($) reporting_unit	Sep. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)	Sep. 30, 2023 USD ($)
Goodwill [Line Items]
Number of reporting units | reporting_unit	3
Goodwill		$ 2,752	$ 2,752	$ 2,752
Commercial Bank
Goodwill [Line Items]
Goodwill	$ 218	218
Institutional Bank
Goodwill [Line Items]
Goodwill	$ 715	$ 715

Goodwill - Schedule of Carrying

Goodwill - Schedule of Carrying Amount of Goodwill (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Goodwill [Roll Forward]
Beginning balance		$ 2,752
Ending balance	$ 2,752	2,752
Consumer Bank
Goodwill [Roll Forward]
Beginning balance		1,819
Ending balance	1,819	1,819
Commercial Bank
Goodwill [Roll Forward]
Beginning balance		933
Ending balance	$ 933	$ 933

Variable Interest Entities - Na

Variable Interest Entities - Narrative (Details) - USD ($)	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Variable Interest Entity [Line Items]
Accrued income and other assets	$ 8,323,000,000		$ 8,601,000,000
Accrued expense and other liabilities	4,478,000,000		5,412,000,000
VIE, assets that can only be used to settle obligations	189,763,000,000		188,281,000,000
VIE, liabilities	172,911,000,000		173,644,000,000
Recurring
Variable Interest Entity [Line Items]
Other investments	73,000,000		63,000,000
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
VIE, assets that can only be used to settle obligations	818,000,000		1,149,000,000
VIE, liabilities	1,000,000		1,000,000
Variable Interest Entity, Not Primary Beneficiary | LIHTC
Variable Interest Entity [Line Items]
Accrued income and other assets	2,200,000,000		2,300,000,000
Accrued expense and other liabilities	1,100,000,000		1,400,000,000
VIE, assets that can only be used to settle obligations	10,008,000,000		8,904,000,000
VIE, liabilities	4,579,000,000		3,848,000,000
Variable Interest Entity, Not Primary Beneficiary | NMTC
Variable Interest Entity [Line Items]
Accrued income and other assets	29,000,000		25,000,000
Variable Interest Entity, Not Primary Beneficiary | Other Unconsolidated Variable Interest Entities
Variable Interest Entity [Line Items]
Other investments	388,000,000
Variable Interest Entity, Not Primary Beneficiary | Investments
Variable Interest Entity [Line Items]
Amortization of investment	171,000,000	$ 163,000,000
Tax credit of investment	166,000,000	151,000,000
Other tax benefits	41,000,000	$ 39,000,000
Variable Interest Entity, Primary Beneficiary | Investments
Variable Interest Entity [Line Items]
VIE, assets that can only be used to settle obligations	0		0
VIE, liabilities	0		0
Measured at NAV | Variable Interest Entity, Not Primary Beneficiary | Recurring | Indirect investments
Variable Interest Entity [Line Items]
Other investments	$ 16,000,000		$ 17,000,000

Variable Interest Entities - Sc

Variable Interest Entities - Schedule of Variable Interest Entities Information (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Variable Interest Entity [Line Items]
Total Assets	$ 189,763	$ 188,281
Total Liabilities	172,911	173,644
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Total Assets	818	1,149
Total Liabilities	1	1
Variable Interest Entity, Not Primary Beneficiary | LIHTC investments
Variable Interest Entity [Line Items]
Total Assets	10,008	8,904
Total Liabilities	4,579	3,848
Maximum Exposure to Loss	2,674	2,768
Variable Interest Entity, Not Primary Beneficiary | Indirect investments
Variable Interest Entity [Line Items]
Total Assets	2,372	2,741
Total Liabilities	3	91
Maximum Exposure to Loss	$ 17	$ 18

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Income Tax Contingency [Line Items]
Effective tax rate (as a percent)	18.80%	17.80%
Combined federal and state statutory tax rate (as a percent)	23.90%
Valuation allowance	$ 15		$ 12
First Niagara Bank, N.A.
Income Tax Contingency [Line Items]
Allocated bad debt deductions	92
Key Corp
Income Tax Contingency [Line Items]
Unrecognized tax benefits	46
Accrued Income And Other Assets
Income Tax Contingency [Line Items]
Net deferred tax assets	$ 1,400		$ 1,800

Discontinued Operations (Detail

Discontinued Operations (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Discontinued operations | Government Guaranteed Loans | Government-guaranteed And Private Education Lending Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loans included in divestiture	$ 272	$ 339

Securities Financing Activiti_3

Securities Financing Activities (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Securities Financing Transaction [Line Items]
Reverse repurchase agreements	$ 0	$ 0
Securities borrowed	0	0
Total	0	0
Repurchase agreements	0	0
Total	0	0
Collateral
Securities Financing Transaction [Line Items]
Reverse repurchase agreements	0	0
Securities borrowed	0	0
Total	0	0
Repurchase agreements	(41)	(31)
Total	(41)	(31)
Federal Agency CMOs
Securities Financing Transaction [Line Items]
Assets pledged as collateral	44
Liabilities pledged as collateral	41
Gross Amount Presented in Balance Sheet
Securities Financing Transaction [Line Items]
Reverse repurchase agreements	3	7
Securities borrowed	0	0
Total	3	7
Repurchase agreements	44	38
Total	44	38
Netting Adjustments
Securities Financing Transaction [Line Items]
Reverse repurchase agreements	(3)	(7)
Securities borrowed	0	0
Total	(3)	(7)
Repurchase agreements	(3)	(7)
Total	$ (3)	$ (7)

Employee Benefits (Details)

Employee Benefits (Details) - Pension Plans - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Defined Benefit Plan Disclosure [Line Items]
Interest cost on PBO	$ 10	$ 11	$ 30	$ 33
Expected return on plan assets	(10)	(11)	(29)	(32)
Amortization of losses	3	3	8	8
Settlement loss	0	0	0	0
Net pension cost	$ 3	$ 3	$ 9	$ 9

Trust Preferred Securities Is_3

Trust Preferred Securities Issued by Unconsolidated Subsidiaries (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Stock	$ 1,257	$ 1,257
Debentures adjustments related to financial instrument hedging	20	15
Total
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Trust Preferred Securities, Net of Discount	432	431
Common Stock	17	17
Principal Amount of Debentures, Net of Discount	$ 449	$ 448
Interest Rate of Trust Preferred Securities and Debentures	6.898%	6.981%
KeyCorp Capital I
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Trust Preferred Securities, Net of Discount	$ 156
Common Stock	6
Principal Amount of Debentures, Net of Discount	$ 162
Interest Rate of Trust Preferred Securities and Debentures	6.333%
KeyCorp Capital II
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Trust Preferred Securities, Net of Discount	$ 87
Common Stock	4
Principal Amount of Debentures, Net of Discount	$ 91
Interest Rate of Trust Preferred Securities and Debentures	6.875%
KeyCorp Capital II | Treasury Rate
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Basis spread on variable rate	0.20%
KeyCorp Capital III
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Trust Preferred Securities, Net of Discount	$ 113
Common Stock	4
Principal Amount of Debentures, Net of Discount	$ 117
Interest Rate of Trust Preferred Securities and Debentures	7.75%
KeyCorp Capital III | Treasury Rate
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Basis spread on variable rate	0.25%
HNC Statutory Trust III
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Trust Preferred Securities, Net of Discount	$ 21
Common Stock	1
Principal Amount of Debentures, Net of Discount	$ 22
Interest Rate of Trust Preferred Securities and Debentures	6.763%
HNC Statutory Trust IV
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Trust Preferred Securities, Net of Discount	$ 21
Common Stock	1
Principal Amount of Debentures, Net of Discount	$ 22
Interest Rate of Trust Preferred Securities and Debentures	6.518%
Willow Grove Statutory Trust I
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Trust Preferred Securities, Net of Discount	$ 18
Common Stock	1
Principal Amount of Debentures, Net of Discount	$ 19
Interest Rate of Trust Preferred Securities and Debentures	6.797%
Westbank Capital Trust II
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Trust Preferred Securities, Net of Discount	$ 8
Common Stock	0
Principal Amount of Debentures, Net of Discount	$ 8
Interest Rate of Trust Preferred Securities and Debentures	7.265%
Westbank Capital Trust III
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Trust Preferred Securities, Net of Discount	$ 8
Common Stock	0
Principal Amount of Debentures, Net of Discount	$ 8
Interest Rate of Trust Preferred Securities and Debentures	7.265%
Keycorp Capital II and III | Redemption Upon Either Tax or a Capital Treatment Event | Treasury Rate
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Basis spread on variable rate	0.50%
Westbank Capital Trust II and III | SOFR
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Basis spread on variable rate	0.26161%

Contingent Liabilities and Gu_3

Contingent Liabilities and Guarantees - Schedule of Guarantees (Details) $ in Millions	Sep. 30, 2024 USD ($)
Guarantor Obligations [Line Items]
Maximum Potential Undiscounted Future Payments	$ 17,677
Liability Recorded	252
Standby letters of credit
Guarantor Obligations [Line Items]
Maximum Potential Undiscounted Future Payments	4,234
Liability Recorded	77
Recourse agreement with FNMA
Guarantor Obligations [Line Items]
Maximum Potential Undiscounted Future Payments	7,743
Liability Recorded	63
Residential mortgage reserve
Guarantor Obligations [Line Items]
Maximum Potential Undiscounted Future Payments	3,385
Liability Recorded	8
Written put options
Guarantor Obligations [Line Items]
Maximum Potential Undiscounted Future Payments	2,315
Liability Recorded	$ 104

Contingent Liabilities and Gu_4

Contingent Liabilities and Guarantees - Narrative (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Commitments Contingencies And Guarantees [Line Items]
Reserve for potential losses	$ 280	$ 286	$ 296	$ 290	$ 291	$ 225
Standby letters of credit
Commitments Contingencies And Guarantees [Line Items]
Remaining weighted-average life of standby letters of credit (in years)	1 year 4 months 24 days
Recourse agreement with FNMA
Commitments Contingencies And Guarantees [Line Items]
Weighted-average remaining term for outstanding commercial mortgage loans (in years)	6 years 4 months 24 days
Unpaid principal balance outstanding of loans sold	$ 24,700
Maximum potential amount of undiscounted future payments possibly required as percentage of principal balance of loans outstanding (as a percent)	31.30%
Reserve for potential losses	$ 63
Residential mortgage reserve
Commitments Contingencies And Guarantees [Line Items]
Unpaid principal balance outstanding of loans sold	$ 11,300
Maximum potential amount of undiscounted future payments possibly required as percentage of principal balance of loans outstanding (as a percent)	30%
Liability for estimated repurchase obligations on loans sold	$ 8
Written put options
Commitments Contingencies And Guarantees [Line Items]
Weighted average life of written put options (in years)	1 year 1 month 6 days
Minimum | Standby letters of credit
Commitments Contingencies And Guarantees [Line Items]
Remaining actual life of standby letters of credit (in years)	1 year
Minimum | Low
Commitments Contingencies And Guarantees [Line Items]
Guarantee obligations (as a percent)	0%
Minimum | Moderate
Commitments Contingencies And Guarantees [Line Items]
Guarantee obligations (as a percent)	30%
Minimum | High
Commitments Contingencies And Guarantees [Line Items]
Guarantee obligations (as a percent)	70%
Maximum | Standby letters of credit
Commitments Contingencies And Guarantees [Line Items]
Remaining actual life of standby letters of credit (in years)	10 years 2 months 12 days
Maximum | Low
Commitments Contingencies And Guarantees [Line Items]
Guarantee obligations (as a percent)	30%
Maximum | Moderate
Commitments Contingencies And Guarantees [Line Items]
Guarantee obligations (as a percent)	70%

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income - Schedule of Changes in AOCI (Details) - 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	$ 14,789	$ 13,844	$ 14,637	$ 13,454
Other comprehensive income before reclassification, net of income taxes	1,007	(783)	765	(885)
Amounts reclassified from AOCI, net of income taxes	856	188	1,183	541
Total other comprehensive income (loss), net of tax	1,863	(595)	1,948	(344)
Ending balance	16,852	13,356	16,852	13,356
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(5,144)	(6,044)	(5,229)	(6,295)
Ending balance	(3,281)	(6,639)	(3,281)	(6,639)
Unrealized gains (losses) on securities available for sale
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(4,282)	(4,736)	(4,190)	(4,895)
Other comprehensive income before reclassification, net of income taxes	951	(668)	850	(509)
Amounts reclassified from AOCI, net of income taxes	712	0	721	0
Total other comprehensive income (loss), net of tax	1,663	(668)	1,571	(509)
Ending balance	(2,619)	(5,404)	(2,619)	(5,404)
Unrealized gains (losses) on derivative financial instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(589)	(1,035)	(763)	(1,124)
Other comprehensive income before reclassification, net of income taxes	57	(115)	(85)	(376)
Amounts reclassified from AOCI, net of income taxes	142	187	458	537
Total other comprehensive income (loss), net of tax	199	72	373	161
Ending balance	(390)	(963)	(390)	(963)
Net pension and postretirement benefit costs
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(273)	(273)	(276)	(276)
Other comprehensive income before reclassification, net of income taxes	(1)	0	0	0
Amounts reclassified from AOCI, net of income taxes	2	1	4	4
Total other comprehensive income (loss), net of tax	1	1	4	4
Ending balance	$ (272)	$ (272)	$ (272)	$ (272)

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Income - Schedule of Reclassifications Out of AOCI (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net securities gains (losses)	$ (935)	$ 0	$ (948)	$ (7)
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	(506)	367	107	1,103
Income taxes	(95)	65	26	204
Income (loss) from continuing operations	(411)	302	81	899
Interest income — Loans	1,516	1,593	4,578	4,645
Interest expense — Long-term debt	(292)	(351)	(952)	(975)
Investment banking and debt placement fees	171	141	467	406
Other expense	670	663	1,980	1,986
Reclassification out of Accumulated Other Comprehensive Income | Unrealized gains (losses) on securities available for sale
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	(935)	0	(948)	0
Income taxes	(223)	0	(227)	0
Income (loss) from continuing operations	(712)	0	(721)	0
Reclassification out of Accumulated Other Comprehensive Income | Realized gains on available for sale securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net securities gains (losses)	0	0	0	0
Reclassification out of Accumulated Other Comprehensive Income | Realized losses on available for sale securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net securities gains (losses)	(935)	0	(948)	0
Reclassification out of Accumulated Other Comprehensive Income | Unrealized gains (losses) on derivative financial instruments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	(187)	(246)	(602)	(706)
Income taxes	(45)	(59)	(144)	(169)
Income (loss) from continuing operations	(142)	(187)	(458)	(537)
Reclassification out of Accumulated Other Comprehensive Income | Unrealized gains (losses) on derivative financial instruments | Interest rate
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income — Loans	(184)	(248)	(599)	(708)
Interest expense — Long-term debt	0	0	(1)	(1)
Investment banking and debt placement fees	(3)	2	(2)	3
Reclassification out of Accumulated Other Comprehensive Income | Net pension and postretirement benefit costs
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	(3)	(3)	(7)	(7)
Income taxes	(1)	(2)	(3)	(3)
Income (loss) from continuing operations	(2)	(1)	(4)	(4)
Reclassification out of Accumulated Other Comprehensive Income | Amortization of losses
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other expense	(3)	(3)	(8)	(8)
Reclassification out of Accumulated Other Comprehensive Income | Settlement loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other expense	0	0	0	0
Reclassification out of Accumulated Other Comprehensive Income | Amortization of unrecognized prior service credit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other expense	$ 0	$ 0	$ 1	$ 1

Shareholders' Equity - Narrativ

Shareholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended		9 Months Ended
	Aug. 30, 2024	Aug. 12, 2024	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Amount repurchased during period less than						$ 38
Cash dividends declared on Common Shares (in usd per share)			$ 0.205	$ 0.205	$ 0.615	$ 0.615
Gross proceeds					$ 811	$ 0
Scotiabank Investment Agreement
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Investments		$ 2,800
Sale of stock, percentage of ownership after transaction	4.90%	14.90%
Fixed price per share (in dollars per share)		$ 17.17
Initial purchase of common shares (in shares)	47,829,359
Gross proceeds	$ 821
Sale of stock, expected consideration received		$ 2,000
Proceeds from issuance costs	$ 10
Equity Compensation Programs
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Amount repurchased during period less than			$ 1

Shareholders' Equity - Schedule

Shareholders' Equity - Schedule of Stockholders Equity (Details)	9 Months Ended
	Sep. 30, 2024 USD ($) $ / shares shares
Series D Preferred Stock
Class of Stock [Line Items]
Preferred stock, dividend rate (as a percent)	5%
Preferred stock, amount outstanding | $	$ 525,000,000
Book value (net of capital surplus) | $	$ 519,000,000
Preferred stock, shares authorized (in shares) | shares	21,000
Preferred stock, shares outstanding (in shares) | shares	21,000
Preferred stock, par value (in usd per share) | $ / shares	$ 1
Liquidation preference | $	$ 25,000
Ownership interest per depositary share ratio	0.04
Preferred stock, liquidation preference (in usd per share) | $ / shares	$ 1,000
Dividend payable per share (in usd per share) | $ / shares	$ 12.50
Series E Preferred Stock
Class of Stock [Line Items]
Preferred stock, dividend rate (as a percent)	6.125%
Preferred stock, amount outstanding | $	$ 500,000,000
Book value (net of capital surplus) | $	$ 490,000,000
Preferred stock, shares authorized (in shares) | shares	500,000
Preferred stock, shares outstanding (in shares) | shares	500,000
Preferred stock, par value (in usd per share) | $ / shares	$ 1
Liquidation preference | $	$ 1,000
Ownership interest per depositary share ratio	0.025
Preferred stock, liquidation preference (in usd per share) | $ / shares	$ 25
Dividend payable per share (in usd per share) | $ / shares	$ 0.382813
Series F Preferred Stock
Class of Stock [Line Items]
Preferred stock, dividend rate (as a percent)	5.65%
Preferred stock, amount outstanding | $	$ 425,000,000
Book value (net of capital surplus) | $	$ 412,000,000
Preferred stock, shares authorized (in shares) | shares	425,000
Preferred stock, shares outstanding (in shares) | shares	425,000
Preferred stock, par value (in usd per share) | $ / shares	$ 1
Liquidation preference | $	$ 1,000
Ownership interest per depositary share ratio	0.025
Preferred stock, liquidation preference (in usd per share) | $ / shares	$ 25
Dividend payable per share (in usd per share) | $ / shares	$ 0.353125
Series G Preferred Stock
Class of Stock [Line Items]
Preferred stock, dividend rate (as a percent)	5.625%
Preferred stock, amount outstanding | $	$ 450,000,000
Book value (net of capital surplus) | $	$ 435,000,000
Preferred stock, shares authorized (in shares) | shares	450,000
Preferred stock, shares outstanding (in shares) | shares	450,000
Preferred stock, par value (in usd per share) | $ / shares	$ 1
Liquidation preference | $	$ 1,000
Ownership interest per depositary share ratio	0.025
Preferred stock, liquidation preference (in usd per share) | $ / shares	$ 25
Dividend payable per share (in usd per share) | $ / shares	$ 0.351563
Series H Preferred Stock
Class of Stock [Line Items]
Preferred stock, dividend rate (as a percent)	6.20%
Preferred stock, amount outstanding | $	$ 600,000,000
Book value (net of capital surplus) | $	$ 590,000,000
Preferred stock, shares authorized (in shares) | shares	600,000
Preferred stock, shares outstanding (in shares) | shares	600,000
Preferred stock, par value (in usd per share) | $ / shares	$ 1
Liquidation preference | $	$ 1,000
Ownership interest per depositary share ratio	0.025
Preferred stock, liquidation preference (in usd per share) | $ / shares	$ 25
Dividend payable per share (in usd per share) | $ / shares	$ 0.387500

Business Segment Reporting - Na

Business Segment Reporting - Narrative (Details)	Sep. 30, 2024 state
Consumer Bank
Segment Reporting Information [Line Items]
Number of state branch networks	15
Commercial Bank
Segment Reporting Information [Line Items]
Number of state branch networks	15

Business Segment Reporting - Sc

Business Segment Reporting - Schedule of Selected Financial Data for Our Business Segments (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($) employee	Sep. 30, 2023 USD ($) employee	Sep. 30, 2024 USD ($) employee	Sep. 30, 2023 USD ($) employee
SUMMARY OF OPERATIONS
Net interest income (TE)	$ 964	$ 923	$ 2,749	$ 3,015
Noninterest income	(269)	643	1,005	1,860
Total revenue (TE)	695	1,566	3,754	4,875
Provision for credit losses	95	81	296	387
Depreciation and amortization expense	53	55	161	176
Other noninterest expense	1,041	1,055	3,155	3,186
Income (loss) from continuing operations before income taxes (TE)	(494)	375	142	1,126
Allocated income taxes and TE adjustments	(83)	73	61	227
Income (loss) from continuing operations	(411)	302	81	899
Income (loss) from discontinued operations, net of taxes	1	1	2	3
NET INCOME (LOSS)	(410)	303	83	902
AVERAGE BALANCES
Loans and leases	106,244	117,627	108,738	119,371
Total assets	187,609	192,341	186,691	193,223
Deposits	147,771	144,825	144,954	143,716
OTHER FINANCIAL DATA
Net loan charge-offs	$ 154	$ 71	$ 326	$ 168
Return on average allocated equity, continuing operations (as a percent)	(10.35%)	8.66%	0.72%	8.57%
Return on average allocated equity	(10.32%)	8.69%	0.74%	8.60%
Average full-time equivalent employees | employee	16,805	17,666	16,734	17,880
Operating Segments | Consumer Bank
SUMMARY OF OPERATIONS
Net interest income (TE)	$ 584	$ 534	$ 1,651	$ 1,677
Noninterest income	230	241	689	709
Total revenue (TE)	814	775	2,340	2,386
Provision for credit losses	52	14	83	106
Depreciation and amortization expense	17	21	58	62
Other noninterest expense	632	655	1,943	1,938
Income (loss) from continuing operations before income taxes (TE)	113	85	256	280
Allocated income taxes and TE adjustments	27	20	61	67
Income (loss) from continuing operations	86	65	195	213
Income (loss) from discontinued operations, net of taxes	0	0	0	0
NET INCOME (LOSS)	86	65	195	213
AVERAGE BALANCES
Loans and leases	38,332	41,610	39,139	42,118
Total assets	41,188	44,429	41,966	44,945
Deposits	86,431	82,683	85,305	82,535
OTHER FINANCIAL DATA
Net loan charge-offs	$ 54	$ 36	$ 144	$ 93
Return on average allocated equity, continuing operations (as a percent)	10.34%	7.42%	7.64%	8.04%
Return on average allocated equity	10.34%	7.42%	7.64%	8.04%
Average full-time equivalent employees | employee	7,388	7,666	7,360	7,850
Operating Segments | Commercial Bank
SUMMARY OF OPERATIONS
Net interest income (TE)	$ 460	$ 446	$ 1,268	$ 1,414
Noninterest income	408	363	1,167	1,079
Total revenue (TE)	868	809	2,435	2,493
Provision for credit losses	41	68	231	283
Depreciation and amortization expense	18	21	59	67
Other noninterest expense	427	412	1,258	1,213
Income (loss) from continuing operations before income taxes (TE)	382	308	887	930
Allocated income taxes and TE adjustments	82	68	176	196
Income (loss) from continuing operations	300	240	711	734
Income (loss) from discontinued operations, net of taxes	0	0	0	0
NET INCOME (LOSS)	300	240	711	734
AVERAGE BALANCES
Loans and leases	67,452	75,598	69,105	76,816
Total assets	76,395	85,930	78,234	86,727
Deposits	58,696	56,078	57,467	53,983
OTHER FINANCIAL DATA
Net loan charge-offs	$ 99	$ 35	$ 200	$ 76
Return on average allocated equity, continuing operations (as a percent)	11.98%	9.11%	9.50%	9.37%
Return on average allocated equity	11.98%	9.11%	9.50%	9.37%
Average full-time equivalent employees | employee	2,387	2,549	2,347	2,530
Other
SUMMARY OF OPERATIONS
Net interest income (TE)	$ (80)	$ (57)	$ (170)	$ (76)
Noninterest income	(907)	39	(851)	72
Total revenue (TE)	(987)	(18)	(1,021)	(4)
Provision for credit losses	2	(1)	(18)	(2)
Depreciation and amortization expense	18	13	44	47
Other noninterest expense	(18)	(12)	(46)	35
Income (loss) from continuing operations before income taxes (TE)	(989)	(18)	(1,001)	(84)
Allocated income taxes and TE adjustments	(192)	(15)	(176)	(36)
Income (loss) from continuing operations	(797)	(3)	(825)	(48)
Income (loss) from discontinued operations, net of taxes	1	1	2	3
NET INCOME (LOSS)	(796)	(2)	(823)	(45)
AVERAGE BALANCES
Loans and leases	460	419	494	437
Total assets	70,026	61,982	66,491	61,551
Deposits	2,644	6,064	2,182	7,198
OTHER FINANCIAL DATA
Net loan charge-offs	$ 1	$ 0	$ (18)	$ (1)
Return on average allocated equity, continuing operations (as a percent)	(125.18%)	11.90%	(68.90%)	(713.06%)
Return on average allocated equity	(125.02%)	7.93%	(68.74%)	(668.50%)
Average full-time equivalent employees | employee	7,030	7,451	7,027	7,500

Revenue from Contracts with C_3

Revenue from Contracts with Customers (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]
Total revenue from contracts with customers	$ 419	$ 347	$ 1,195	$ 1,074
Total noninterest income	(269)	643	1,005	1,860
Contract assets	0	0	0	0
Contract liabilities	0	0	0	0
Trust and investment services income
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	131	120	385	356
Investment banking and debt placement fees
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	128	70	357	261
Services charges on deposit accounts
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	67	69	196	205
Cards and payments income
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	90	85	247	243
Other noninterest income
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	3	3	10	9
Total noninterest income	219	257	661	714
Operating Segments | Consumer Bank
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	197	191	580	572
Operating Segments | Consumer Bank | Trust and investment services income
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	114	104	334	306
Operating Segments | Consumer Bank | Investment banking and debt placement fees
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
Operating Segments | Consumer Bank | Services charges on deposit accounts
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	35	41	103	121
Operating Segments | Consumer Bank | Cards and payments income
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	45	43	133	136
Operating Segments | Consumer Bank | Other noninterest income
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	3	3	10	9
Operating Segments | Commercial Bank
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	222	156	615	502
Operating Segments | Commercial Bank | Trust and investment services income
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	17	16	51	50
Operating Segments | Commercial Bank | Investment banking and debt placement fees
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	128	70	357	261
Operating Segments | Commercial Bank | Services charges on deposit accounts
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	32	28	93	84
Operating Segments | Commercial Bank | Cards and payments income
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	45	42	114	107
Operating Segments | Commercial Bank | Other noninterest income
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
Other
Disaggregation of Revenue [Line Items]
Total noninterest income	$ (907)	$ 39	$ (851)	$ 72