KeyCorp (KEY) 10-Q 2 Nov 21 2021 Q3 Quarterly report Financial data

Cover Page

Cover Page - shares	9 Months Ended
	Sep. 30, 2021	Oct. 29, 2021
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2021
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		931,058,285
Entity Central Index Key	0000091576
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Amendment Flag	false
Common Stock
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

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands		Sep. 30, 2021	Dec. 31, 2020
ASSETS
Cash and due from banks		$ 763,000	$ 1,091,000
Short-term investments		19,608,000	16,194,000
Trading account assets		902,000	735,000
Securities available for sale		40,594,000	27,556,000
Held-to-maturity securities (fair value: $8,664 and $8,023)		8,423,000	7,595,000
Other investments		607,000	621,000
Loans, net of unearned income of $361 and $449		98,609,000	101,185,000
Less: Allowance for loan and lease losses		(1,084,000)	(1,626,000)
Net loans		97,525,000	99,559,000
Loans held for sale	[1]	1,805,000	1,583,000
Premises and equipment		678,000	753,000
Goodwill		2,673,000	2,664,000
Other intangible assets		144,000	188,000
Corporate-owned life insurance		4,312,000	4,286,000
Accrued income and other assets		8,404,000	6,812,000
Discontinued assets		597,000	699,000
Total assets		187,035,000	170,336,000
Deposits in domestic offices:
NOW and money market deposit accounts		87,242,000	80,427,000
Savings deposits		7,259,000	5,913,000
Certificates of deposit ($100,000 or more)		1,890,000	2,733,000
Other time deposits		2,315,000	3,010,000
Total interest-bearing deposits		98,706,000	92,083,000
Noninterest-bearing deposits		53,225,000	43,199,000
Total deposits		151,931,000	135,282,000
Federal funds purchased and securities sold under repurchase agreements		228,000	220,000
Bank notes and other short-term borrowings		767,000	759,000
Accrued expense and other liabilities		3,434,000	2,385,000
Long-term debt		13,165,000	13,709,000
Total liabilities		169,525,000	152,355,000
EQUITY
Preferred stock		1,900,000	1,900,000
Common Shares, $1 par value; authorized 2,100,000,000 and 2,100,000,000 shares; issued 1,256,702,081 and 1,256,702,081 shares		1,257,000	1,257,000
Capital surplus		6,141,000	6,281,000
Retained earnings		14,133,000	12,751,000
Treasury stock, at cost (326,158,458 and 280,928,782 shares)		(5,876,000)	(4,946,000)
Accumulated other comprehensive income (loss)		(45,000)	738,000
Key shareholders’ equity		17,510,000	17,981,000
Total liabilities and equity		$ 187,035,000	$ 170,336,000
[1]	Total loans held for sale include real estate — residential mortgage loans held for sale at fair value of $237 million at September 30, 2021, and $264 million at December 31, 2020.

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Fair Value	$ 8,664,000,000	$ 8,023,000,000
Financing Receivable, Deferred Commitment Fee	361,000,000	449,000,000
Aggregate Amount Of Certificates Of Deposit	$ 100,000	$ 100,000
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)	326,158,458	280,928,782
Residential Mortgage
Loans held for sale	$ 237,000,000	$ 264,000,000

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
INTEREST INCOME
Loans		$ 882	$ 927	$ 2,659	$ 2,933
Loans held for sale		13	18	35	58
Securities available for sale		135	115	398	365
Held-to-maturity securities		43	53	133	171
Trading account assets		4	3	14	16
Short-term investments		9	1	20	14
Other investments		1	2	5	3
Total interest income		1,087	1,119	3,264	3,560
INTEREST EXPENSE
Deposits		15	54	52	319
Federal funds purchased and securities sold under repurchase agreements		0	0	0	6
Bank notes and other short-term borrowings		2	1	6	11
Long-term debt		54	64	168	225
Total interest expense		71	119	226	561
NET INTEREST INCOME		1,016	1,000	3,038	2,999
Provision for credit losses		(107)	160	(422)	1,001
Net interest income after provision for credit losses		1,123	840	3,460	1,998
NONINTEREST INCOME
Trust and investment services income		129	128	395	384
Investment banking and debt placement fees		235	146	614	418
Service charges on deposit accounts		91	77	247	229
Operating lease income and other leasing gains		37	38	111	128
Corporate services income		69	51	188	165
Cards and payments income		111	114	329	271
Corporate-owned life insurance income		33	30	94	101
Consumer mortgage income		33	51	106	133
Commercial mortgage servicing fees		34	18	112	48
Other income	[1]	25	28	89	(27)
Total noninterest income		797	681	2,285	1,850
NONINTEREST EXPENSE
Personnel		640	588	1,887	1,675
Net occupancy		74	76	225	223
Computer processing		67	59	211	170
Business services and professional fees		56	49	157	142
Equipment		25	25	75	74
Operating lease expense		30	33	95	103
Marketing		32	22	89	67
Intangible asset amortization		15	15	44	50
Other expense		173	170	476	477
Total noninterest expense		1,112	1,037	3,259	2,981
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES		808	484	2,486	867
Income taxes		165	60	501	113
INCOME (LOSS) FROM CONTINUING OPERATIONS		643	424	1,985	754
Income (loss) from discontinued operations		2	4	11	7
NET INCOME (LOSS)		645	428	1,996	761
Less: Net income (loss) attributable to noncontrolling interests		0	0	0	0
NET INCOME (LOSS) ATTRIBUTABLE TO KEY		645	428	1,996	761
Income (loss) from continuing operations attributable to Key common shareholders		616	397	1,905	674
Net income (loss) attributable to Key common shareholders		$ 618	$ 401	$ 1,916	$ 681
Per Common Share:
Income (loss) from continuing operations attributable to Key common shareholders (in usd per share)		$ 0.65	$ 0.41	$ 1.99	$ 0.70
Income (loss) from discontinued operations, net of taxes (in usd per share)		0	0	0.01	0.01
Net income (loss) attributable to Key common shareholders (in usd per share)	[2]	0.66	0.41	2	0.70
Per Common Share — assuming dilution:
Income (loss) from continuing operations attributable to Key common shareholders (in usd per share)		0.65	0.41	1.98	0.69
Income (loss) from discontinued operations, net of taxes (in usd per share)		0	0	0.01	0.01
Net income (loss) attributable to Key common shareholders (in usd per share)	[2]	0.65	0.41	1.99	0.70
Cash dividends declared per common share (in usd per share)		$ 0.185	$ 0.185	$ 0.555	$ 0.555
Weighted-average common shares outstanding (000) (in shares)		942,446	967,804	955,069	967,632
Effect of common share options and other stock awards (in shares)		10,077	6,184	9,712	6,648
Weighted-average common shares and potential common shares outstanding (in shares)	[3]	952,523	973,988	964,781	974,280
[1]	For the three and nine months ended September 30, 2021, net securities gains (losses) totaled less than $1 million. For the three months ended September 30, 2021 and September 30, 2020, we did not have any impairment losses related to securities. For the three months ended September 30, 2020, we had no net securities gains (losses). For the nine months ended September 30, 2020, net securities gains (losses) totaled $4 million.
[2]	EPS may not foot due to rounding.
[3]	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 ($)	3 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Impairment losses related to securities	$ 0	$ 0
Maximum
Net securities gains (losses)	$ 1,000,000

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 645	$ 428	$ 1,996	$ 761
Other comprehensive income (loss), net of tax:
Net unrealized gains (losses) on securities available for sale, net of income taxes of $56, $(3), $195, and $163	(174)	(8)	(617)	527
Net unrealized gains (losses) on derivative financial instruments, net of income taxes of $9, $(19), $57, and $93	(29)	(64)	(180)	299
Net pension and postretirement benefit costs, net of income taxes of $(3), $1, $(5), and $5	8	3	14	15
Total other comprehensive income (loss), net of tax	(195)	(69)	(783)	841
Comprehensive income (loss)	450	359	1,213	1,602
Less: Comprehensive income attributable to noncontrolling interests	0	0	0	0
Comprehensive income (loss) attributable to Key	$ 450	$ 359	$ 1,213	$ 1,602

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net unrealized gains (losses) on securities available for sale, tax	$ 56	$ (3)	$ 195	$ 163
Net unrealized gains (losses) on derivative financial instruments, tax	9	(19)	57	93
Net pension and postretirement benefit costs, tax	$ (3)	$ 1	$ (5)	$ 5

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	Preferred Stock	Common Stock	Capital Surplus	Retained Earnings	Retained EarningsSeries D Preferred Stock	Retained EarningsSeries E Preferred Stock	Retained EarningsSeries F Preferred Stock	Retained EarningsSeries G Preferred Stock	Treasury Stock, at Cost	Accumulated Other Comprehensive Income (Loss)	Cumulative Effect, Period of Adoption, Adjustment	[1]	Cumulative Effect, Period of Adoption, AdjustmentRetained Earnings	[1]
Beginning Balance, Preferred Shares (in shares) at Dec. 31, 2019						1,396,000
Beginning Balance, Common Shares (in shares) at Dec. 31, 2019							977,189,000
Beginning balance at Dec. 31, 2019	$ 17,038					$ 1,900	$ 1,257	$ 6,295	$ 12,469					$ (4,909)	$ 26	$ (230)		$ (230)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	761								761
Other comprehensive income (loss)	841														841
Deferred compensation	2							2
Cash dividends declared on common shares	(542)								(542)
Cash dividends declared on preferred stock		$ (20)	$ (23)	$ (18)	$ (19)					$ (20)	$ (23)	$ (18)	$ (19)
Open market Common Share repurchases (in shares)							(6,067,000)
Open market Common Share repurchases	(117)													(117)
Employee equity compensation program Common Share repurchases (in shares)							(1,815,000)
Employee equity compensation program Common Share repurchases	(70)							(34)						(36)
Common shares reissued (returned) for stock options and other employee benefit plans (in shares)							6,898,000
Common shares reissued (returned) for stock options and other employee benefit plans	122													122
Other	(3)								(3)
Ending Balance, Preferred Shares (in shares) at Sep. 30, 2020						1,396,000
Ending Balance, Common Shares (in shares) at Sep. 30, 2020							976,205,000
Ending balance at Sep. 30, 2020	17,722					$ 1,900	$ 1,257	6,263	12,375					(4,940)	867
Beginning Balance, Preferred Shares (in shares) at Jun. 30, 2020						1,396,000
Beginning Balance, Common Shares (in shares) at Jun. 30, 2020							975,947,000
Beginning balance at Jun. 30, 2020	17,542					$ 1,900	$ 1,257	6,240	12,154					(4,945)	936
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	428								428
Other comprehensive income (loss)	(69)														(69)
Deferred compensation	2							2
Cash dividends declared on common shares	(180)								(180)
Cash dividends declared on preferred stock		(7)	(8)	(6)	(6)					(7)	(8)	(6)	(6)
Open market Common Share repurchases (in shares)							0
Open market Common Share repurchases	0													0
Employee equity compensation program Common Share repurchases (in shares)							(1,000)
Employee equity compensation program Common Share repurchases	21							21						0
Common shares reissued (returned) for stock options and other employee benefit plans (in shares)							259,000
Common shares reissued (returned) for stock options and other employee benefit plans	5							0						5
Ending Balance, Preferred Shares (in shares) at Sep. 30, 2020						1,396,000
Ending Balance, Common Shares (in shares) at Sep. 30, 2020							976,205,000
Ending balance at Sep. 30, 2020	17,722					$ 1,900	$ 1,257	6,263	12,375					(4,940)	867
Beginning Balance, Preferred Shares (in shares) at Dec. 31, 2020						1,396,000
Beginning Balance, Common Shares (in shares) at Dec. 31, 2020							975,773,000
Beginning balance at Dec. 31, 2020	17,981					$ 1,900	$ 1,257	6,281	12,751					(4,946)	738
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	1,996								1,996
Other comprehensive income (loss)	(783)														(783)
Deferred compensation	5							5
Cash dividends declared on common shares	(534)								(534)
Cash dividends declared on preferred stock		$ (20)	$ (23)	$ (18)	$ (19)					(20)	(23)	(18)	(19)
Open market Common Share repurchases (in shares)							(27,346,000)
Open market Common Share repurchases	(559)													(559)
Employee equity compensation program Common Share repurchases (in shares)							(1,604,000)
Employee equity compensation program Common Share repurchases	(32)													(32)
Common shares reissued (returned) for stock options and other employee benefit plans (in shares)							7,274,000
Common shares reissued (returned) for stock options and other employee benefit plans	101							(28)						129
Common share purchases under accelerated repurchase program (in shares)							(23,553,000)
Common share purchases under ASR program	(585)							(117)						(468)
Ending Balance, Preferred Shares (in shares) at Sep. 30, 2021		21,000	500,000	425,000	450,000	1,396,000
Ending Balance, Common Shares (in shares) at Sep. 30, 2021							930,544,000
Ending balance at Sep. 30, 2021	17,510					$ 1,900	$ 1,257	6,141	14,133					(5,876)	(45)
Beginning Balance, Preferred Shares (in shares) at Jun. 30, 2021						1,396,000
Beginning Balance, Common Shares (in shares) at Jun. 30, 2021							960,276,000
Beginning balance at Jun. 30, 2021	17,941					$ 1,900	$ 1,257	6,232	13,689					(5,287)	150
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	645								645
Other comprehensive income (loss)	(195)														(195)
Deferred compensation	5							5
Cash dividends declared on common shares	(176)								(176)
Cash dividends declared on preferred stock		$ (6)	$ (7)	$ (7)	$ (5)					$ (6)	$ (7)	$ (7)	$ (5)
Open market Common Share repurchases (in shares)							(6,367,000)
Open market Common Share repurchases	(125)													(125)
Employee equity compensation program Common Share repurchases (in shares)							(3,000)
Employee equity compensation program Common Share repurchases	0							0						0
Common shares reissued (returned) for stock options and other employee benefit plans (in shares)							191,000
Common shares reissued (returned) for stock options and other employee benefit plans	25							21						4
Common share purchases under accelerated repurchase program (in shares)							(23,553,000)
Common share purchases under ASR program	(585)							(117)						(468)
Ending Balance, Preferred Shares (in shares) at Sep. 30, 2021		21,000	500,000	425,000	450,000	1,396,000
Ending Balance, Common Shares (in shares) at Sep. 30, 2021							930,544,000
Ending balance at Sep. 30, 2021	$ 17,510					$ 1,900	$ 1,257	$ 6,141	$ 14,133					$ (5,876)	$ (45)
[1]	Includes the impact of implementing ASU 2016-13, Financial Instruments - Credit Losses (ASC 326): Measurement of Credit Losses on Financial Instruments. See Note 1 (“Summary of Significant Accounting Policies) in our 2020 Form 10-K for more information on our adoption of this guidance and the impact to our results of operations.

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Equity (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Cash dividends declared on Common Shares (in usd per share)	$ 0.185	$ 0.185	$ 0.555	$ 0.555
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	$ 0.53125	$ 1.054689	$ 1.054689

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
OPERATING ACTIVITIES
Net income (loss)	$ 1,996	$ 761
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Provision for credit losses	(422)	1,001
Depreciation and amortization expense, net	80	112
Accretion of acquired loans	19	23
Increase in cash surrender value of corporate-owned life insurance	(82)	(86)
Stock-based compensation expense	78	75
Deferred income taxes (benefit)	126	(217)
Proceeds from sales of loans held for sale	11,282	10,079
Originations of loans held for sale, net of repayments	(10,818)	(10,040)
Net losses (gains) on sales of loans held for sale	(192)	(169)
Net losses (gains) on leased equipment	(9)	(17)
Net securities losses (gains)	0	(4)
Net losses (gains) on sales of fixed assets	13	3
Net decrease (increase) in trading account assets	(167)	307
Net transfers of loans held for sale	26	0
Other operating activities, net	(767)	(1,101)
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	1,163	727
INVESTING ACTIVITIES
Cash received (used) in acquisitions, net of cash acquired	(9)	0
Net decrease (increase) in short-term investments, excluding acquisitions	(3,414)	(12,876)
Purchases of securities available for sale	(19,726)	(9,582)
Proceeds from sales of securities available for sale	0	583
Proceeds from prepayments and maturities of securities available for sale	5,824	4,642
Proceeds from prepayments and maturities of held-to-maturity securities	2,004	1,702
Purchases of held-to-maturity securities	(3)	(17)
Purchases of other investments	(26)	(110)
Proceeds from sales of other investments	36	79
Proceeds from prepayments and maturities of other investments	8	13
Net decrease (increase) in loans, excluding acquisitions, sales and transfers	(545)	(9,118)
Proceeds from sales of portfolio loans	(243)
Proceeds from sales of portfolio loans		140
Proceeds from corporate-owned life insurance	56	46
Purchases of premises, equipment, and software	(31)	(45)
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES	(16,069)	(24,543)
FINANCING ACTIVITIES
Net increase (decrease) in deposits, excluding acquisitions	16,649	24,876
Net increase (decrease) in short-term borrowings	16	(61)
Net proceeds from issuance of long-term debt	1,203	2,502
Payments on long-term debt	(1,521)	(2,509)
Open market common share repurchases	(559)	(117)
Employee equity compensation program Common Share repurchases	(32)	(36)
Common share purchases under ASR program	(585)	0
Net proceeds from reissuance of Common Shares	21	7
Cash dividends paid	(614)	(622)
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	14,578	24,040
NET INCREASE (DECREASE) IN CASH AND DUE FROM BANKS	(328)	224
CASH AND DUE FROM BANKS AT BEGINNING OF PERIOD	1,091	732
CASH AND DUE FROM BANKS AT END OF PERIOD	763	956
Additional disclosures relative to cash flows:
Interest paid	254	601
Income taxes paid (refunded)	212	175
Noncash items:
Reduction of secured borrowing and related collateral	7	5
Loans transferred to portfolio from held for sale	86	32
Loans transferred to held for sale from portfolio	3,403	292
Loans transferred to OREO	3	94
CMBS risk retentions	0	41
ABS risk retentions	13	22
Securities received as consideration	$ 2,825	$ 0

Basis of Presentation and Accou

Basis of Presentation and Accounting Policies	9 Months Ended
	Sep. 30, 2021
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 to conform to current reporting practices. 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% 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 2020 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. Goodwill and Other Intangible Assets Effective January 1, 2021, Key changed its approach for allocating equity to its reporting units. The carrying amounts of Key’s reporting units now represent the combination of regulatory and economic equity for goodwill impairment testing and management reporting purposes. The fair values of each reporting unit are estimated using a combination of market and income approaches. For more information, refer to Note 10 (“Goodwill”). Accounting Guidance Adopted in 2021 Standard Required Adoption Description Effect on Financial Statements or ASU 2019-12, January 1, 2021 This ASU simplifies the accounting for income Along with general improvements, it adds The guidance should be applied on either a The adoption of this accounting guidance did not have a material effect on our financial condition or results of operations. ASU 2020-01, January 1, 2021 This guidance clarifies that when applying the It also clarifies that companies should not This guidance should be applied on prospective basis. The adoption of this accounting guidance did not have a material effect on our financial condition or results of operations. ASU 2020-08, Codification Improvements to Subtopic 310-20, Receivables—Nonrefundable Fees and Other Costs January 1, 2021 This ASU clarifies that at each reporting period an entity should reevaluate whether a callable debt security is within the scope of ASC 310, which says that to the extent the amortized cost basis of an individual callable debt security exceeds the amount repayable by the issuer at the earliest call date, the premium shall be amortized to the earliest call date, unless prepayment guidance is applied. This guidance should be applied on a prospective basis. The adoption of this accounting guidance did not have a material effect on our financial condition or results of operations. ASU 2021-01, Reference January 1, 2021 The ASU clarifies that certain optional expedients and exceptions related to contracts modified as a result of reference rate reform and hedge accounting apply to derivatives affected by the discounting transition, such as those that use an interest rate for margining, The guidance may be applied on a full retrospective basis as of any date from the beginning of an interim period that includes or is subsequent to March 12, 2020. Alternatively, it may be applied on a prospective basis to new modifications from any date within an interim period that includes or is subsequent to the date of the issuance of a final Update, until the financial statements are available to be issued. Key adopted this guidance on January 1, 2021, on a prospective basis and will assess the impact in conjunction with the reference rate transition.

Earnings Per Common Share

Earnings Per Common Share	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Earnings Per Common Share	2. Earnings Per Common Share Basic earnings per share is the amount of earnings (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 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 2021 2020 2021 2020 EARNINGS Income (loss) from continuing operations $ 643 $ 424 $ 1,985 $ 754 Less: Net income (loss) attributable to noncontrolling interests — — — — Income (loss) from continuing operations attributable to Key 643 424 1,985 754 Less: Dividends on Preferred Stock 27 27 80 80 Income (loss) from continuing operations attributable to Key common shareholders 616 397 1,905 674 Income (loss) from discontinued operations, net of taxes 2 4 11 7 Net income (loss) attributable to Key common shareholders $ 618 $ 401 $ 1,916 $ 681 WEIGHTED-AVERAGE COMMON SHARES Weighted-average Common Shares outstanding (000) 942,446 967,804 955,069 967,632 Effect of Common Share options and other stock awards 10,077 6,184 9,712 6,648 Weighted-average Common Shares and potential Common Shares outstanding (000) (a) 952,523 973,988 964,781 974,280 EARNINGS PER COMMON SHARE Income (loss) from continuing operations attributable to Key common shareholders $ .65 $ .41 $ 1.99 $ .70 Income (loss) from discontinued operations, net of taxes — — .01 .01 Net income (loss) attributable to Key common shareholders (b) .66 .41 2.00 .70 Income (loss) from continuing operations attributable to Key common shareholders — assuming dilution $ .65 $ .41 $ 1.98 $ .69 Income (loss) from discontinued operations, net of taxes — assuming dilution — — .01 .01 Net income (loss) attributable to Key common shareholders — assuming dilution (b) .65 .41 1.99 .70 (a) Assumes conversion of Common Share options and other stock awards and/or convertible preferred stock, as applicable. (b) EPS may not foot due to rounding.

Loan Portfolio

Loan Portfolio	9 Months Ended
	Sep. 30, 2021
Loans Receivables [Abstract]
Loan Portfolio	3. Loan Portfolio Loan Portfolio by Portfolio Segment and Financing Receivable (a) Dollars in millions September 30, 2021 December 31, 2020 Commercial and industrial (b) $ 49,553 $ 52,907 Commercial real estate: Commercial mortgage 13,674 12,687 Construction 2,120 1,987 Total commercial real estate loans 15,794 14,674 Commercial lease financing (c) 3,982 4,399 Total commercial loans 69,329 71,980 Residential — prime loans: Real estate — residential mortgage 14,204 9,298 Home equity loans 8,747 9,360 Total residential — prime loans 22,951 18,658 Consumer direct loans 5,324 4,714 Credit cards 928 989 Consumer indirect loans 77 4,844 Total consumer loans 29,280 29,205 Total loans (d) $ 98,609 $ 101,185 (a) Accrued interest of $211 million and $241 million at September 30, 2021, and December 31, 2020, respectively, presented in "other assets" on the Consolidated Balance Sheets is excluded from the amortized cost basis disclosed in this table. (b) Loan balances include $139 million and $127 million of commercial credit card balances at September 30, 2021, and December 31, 2020, respectively. (c) Commercial lease financing includes receivables held as collateral for a secured borrowing of $16 million and $23 million at September 30, 2021, and December 31, 2020, respectively. Principal reductions are based on the cash payments received from these related receivables. Additional information pertaining to this secured borrowing is included in Note 20 (“Long-Term Debt”) beginning on page 171 of our 2020 Form 10-K.

Asset Quality

Asset Quality	9 Months Ended
	Sep. 30, 2021
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 110 of our 2020 Form 10-K. The ALLL at September 30, 2021, 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, 2021: Dollars in millions June 30, 2021 Provision Charge-offs Recoveries September 30, 2021 Commercial and Industrial $ 499 $ (30) $ (27) $ 20 $ 462 Commercial real estate: Real estate — commercial mortgage 227 (44) — 1 184 Real estate — construction 35 (8) — — 27 Total commercial real estate loans 262 (52) — 1 211 Commercial lease financing 34 (7) (1) 6 32 Total commercial loans 795 (89) (28) 27 705 Real estate — residential mortgage 86 (1) 2 1 88 Home equity loans 136 (13) (1) 2 124 Consumer direct loans 115 (5) (7) 2 105 Credit cards 68 (4) (6) 1 59 Consumer indirect loans 20 5 (26) 4 3 Total consumer loans 425 (18) (38) 10 379 Total ALLL — continuing operations 1,220 (107) (66) 37 1,084 Discontinued operations 30 (1) (1) 1 29 Total ALLL — including discontinued operations $ 1,250 $ (108) $ (67) $ 38 $ 1,113 Three months ended September 30, 2020: Dollars in millions June 30, 2020 Provision Charge-offs Recoveries September 30, 2020 Commercial and Industrial $ 725 $ 177 $ (101) $ 9 $ 810 Commercial real estate: Real estate — commercial mortgage 292 (2) (13) 2 279 Real estate — construction 41 (7) — — 34 Total commercial real estate loans 333 (9) (13) 2 313 Commercial lease financing 55 13 (10) — 58 Total commercial loans 1,113 181 (124) 11 1,181 Real estate — residential mortgage 101 2 — 1 104 Home equity loans 197 (13) (4) 3 183 Consumer direct loans 130 1 (8) 2 125 Credit cards 107 (5) (9) 2 95 Consumer indirect loans 60 (16) (6) 4 42 Total consumer loans 595 (31) (27) 12 549 Total ALLL — continuing operations 1,708 150 (a) (151) 23 1,730 Discontinued operations 43 (1) — — 42 Total ALLL — including discontinued operations $ 1,751 $ 149 $ (151) $ 23 $ 1,772 (a) Excludes a provision for losses on lending-related commitments of $10 million. Nine months ended September 30, 2021 Dollars in millions December 31, 2020 Provision Charge-offs Recoveries September 30, 2021 Commercial and Industrial $ 678 $ (135) $ (141) $ 60 $ 462 Commercial real estate: Real estate — commercial mortgage 327 (112) (39) 8 184 Real estate — construction 47 (20) — — 27 Total commercial real estate loans 374 (132) — — 211 Commercial lease financing 47 (17) (5) 7 32 Total commercial loans 1,099 (284) (185) 75 705 Real estate — residential mortgage 102 (17) 1 2 88 Home equity loans 171 (44) (7) 4 124 Consumer direct loans 128 (7) (22) 6 105 Credit cards 87 (13) (21) 6 59 Consumer indirect loans 39 (12) (38) 14 3 Total consumer loans 527 (93) (87) 32 379 Total ALLL — continuing operations 1,626 (377) (a) (272) 107 1,084 Discontinued operations 36 (6) (3) 2 29 Total ALLL — including discontinued operations $ 1,662 $ (383) $ (275) $ 109 $ 1,113 (a) Excludes a credit for losses on lending-related comm itments of $45 million Nine months ended September 30, 2020 Dollars in millions December 31, 2019 Impact of ASC 326 Adoption January 1, 2020 Provision Charge-offs Recoveries September 30, 2020 Commercial and Industrial $ 551 $ (141) $ 410 $ 613 $ (232) $ 19 $ 810 Commercial real estate: Real estate — commercial mortgage 143 16 159 135 (18) 3 279 Real estate — construction 22 (7) 15 19 — — 34 Total commercial real estate loans 165 9 174 154 (18) 3 313 Commercial lease financing 35 8 43 30 (16) 1 58 Total commercial loans 751 (124) 627 797 (266) 23 1,181 Real estate — residential mortgage 7 77 84 21 (2) 1 104 Home equity loans 31 147 178 9 (10) 6 183 Consumer direct loans 34 63 97 52 (30) 6 125 Credit cards 47 35 82 39 (32) 6 95 Consumer indirect loans 30 6 36 16 (22) 12 42 Total consumer loans 149 328 477 137 (96) 31 549 Total ALLL — continuing operations 900 204 1,104 934 (a) (362) 54 1,730 Discontinued operations 10 31 41 2 (4) 3 42 Total ALLL — including discontinued operations $ 910 $ 235 $ 1,145 $ 936 $ (366) $ 57 $ 1,772 (a) Excludes a provision for losses on lending-related commitments of $67 million. As described in Note 1 ("Summary of Significant Accounting Policies"), under the heading “Allowance for Loan and Lease Losses” beginning on page 110 of our 2020 Form 10-K, we estimate the ALLL using relevant available information, from internal and external sources, relating to past events, current 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), GDP, industrial production, and unemployment rate Commercial real estate BBB corporate bond rate (spread), property and real estate price indices, and unemployment rate 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 Consumer direct Unemployment rate and U.S. household income Consumer indirect New vehicle sales, used vehicle prices, and unemployment rate 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, 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, 2021, the economic outlook continues to be strong, but the emergence of the Delta variant of the COVID-19 virus negatively impacted supply chains and consumer confidence. We utilized the Moody’s August 2021 Consensus forecast as our baseline forecast to estimate our expected credit losses as of September 30, 2021. We determined such forecast to be a reasonable view of the outlook for the economy given all available information at quarter end. The baseline scenario continues to reflect moderate economic growth over the next two years in markets in which we operate. U.S. GDP continues to increase at an 8.2% annualized rate in the third quarter of 2021 and at an annual rate of approximately 6% and 5% for 2021 and 2022, respectively. The national unemployment rate forecast is 5.3% in the third quarter of 2021, and is expected to decline to 4.7% by the fourth quarter of 2021 and 4.0% by the fourth quarter of 2022. 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 unprecedented economic uncertainty caused by the COVID-19 pandemic, our future loss estimates may vary considerably from our September 30, 2021 assumptions. Commercial Loan Portfolio The ALLL from continuing operations for the commercial segment decreased by $90 million, or 11.3%, from June 30, 2021. The overall decrease in the allowance is driven by improvements in economic forecasts and asset quality, partially offset by loan growth. The changes to the economic forecast primarily reflect improvements in economic drivers used in our models. The favorable unemployment and GDP outlook contributes to the overall commercial segment reserve decrease. Expected improvements in real estate price indices lead to a reduction in reserve for our commercial real estate book. Positive risk rating migrations are driving a modest decrease in ALLL levels for the commercial and industrial portfolio. The ALLL results also reflect incremental credit risk considerations as a result of the future economic uncertainties which are addressed through qualitative adjustments. As of September 30, 2021, we concluded that no ALLL is necessary for $3.1 billion in outstanding PPP loans as they are 100% guaranteed by the SBA. Consumer Loan Portfolio The ALLL from continuing operations for the consumer segment decreased by $46 million, or 10.8%, from June 30, 2021. The overall decrease in the allowance is driven by updated economic forecasts that capture an im proving outlook for several drivers and strong portfolio performance, partially offset by growth in consumer real estate. The most meaningful changes to the economic forecast contributing to the reduction in reserves include improvement in the unemployment rate outlook, which impacts all consumer portfolios. In addition, the housing market and home price index outlook continue to display strength, which impacts the residential mortgage and home equity segments. As it relates to the decline in the ALLL due to portfolio factors, shifts are largely driven by attrition activity, targeted portfolio growth and overall strong credit drivers. The ALLL results also reflect incremental credit risk considerations as a result of the economic uncertainty and related borrower assistance programs, which are addressed through qualitative adjustments. 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 problem 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) As of September 30, 2021 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 2021 2020 2019 2018 2017 Prior Total Commercial and Industrial Risk Rating: Pass $ 9,315 $ 5,420 $ 4,491 $ 3,186 $ 2,016 $ 3,884 $ 18,950 $ 102 $ 47,364 Criticized (Accruing) 40 115 193 192 236 208 925 27 1,936 Criticized (Nonaccruing) — 9 18 41 6 16 160 3 253 Total commercial and industrial 9,355 5,544 4,702 3,419 2,258 4,108 20,035 132 49,553 Real estate — commercial mortgage Risk Rating: Pass 3,219 1,357 2,589 1,338 687 3,073 690 64 13,017 Criticized (Accruing) 15 20 87 85 123 228 48 2 608 Criticized (Nonaccruing) — 1 1 5 1 37 4 — 49 Total real estate — commercial mortgage 3,234 1,378 2,677 1,428 811 3,338 742 66 13,674 Real estate — construction Risk Rating: Pass 318 619 610 292 104 49 29 6 2,027 Criticized (Accruing) — 4 13 52 22 1 1 — 93 Criticized (Nonaccruing) — — — — — — — — — Total real estate — construction 318 623 623 344 126 50 30 6 2,120 Commercial lease financing Risk Rating: Pass 655 815 744 348 347 997 — — 3,906 Criticized (Accruing) — 4 35 14 13 5 — — 71 Criticized (Nonaccruing) — — 1 1 1 2 — — 5 Total commercial lease financing 655 819 780 363 361 1,004 — 3,982 Total commercial loans $ 13,562 $ 8,364 $ 8,782 $ 5,554 $ 3,556 $ 8,500 $ 20,807 $ 204 $ 69,329 As of December 31, 2020 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 2020 2019 2018 2017 2016 Prior Total Commercial and Industrial Risk Rating: Pass $ 13,100 $ 5,487 $ 4,040 $ 2,617 $ 1,967 $ 2,709 $ 19,832 $ 118 $ 49,870 Criticized (Accruing) 66 198 174 236 150 279 1,527 22 2,652 Criticized (Nonaccruing) 8 27 71 28 17 7 226 1 385 Total commercial and industrial 13,174 5,712 4,285 2,881 2,134 2,995 21,585 141 52,907 Real estate — commercial mortgage Risk Rating: Pass 1,591 2,937 1,737 867 765 3,027 885 43 11,852 Criticized (Accruing) 12 142 81 145 72 255 22 2 731 Criticized (Nonaccruing) — 1 4 4 2 88 5 — 104 Total real estate — commercial mortgage 1,603 3,080 1,822 1,016 839 3,370 912 45 12,687 Real estate — construction Risk Rating: Pass 367 764 510 188 27 22 31 5 1,914 Criticized (Accruing) — 14 38 18 — 2 1 — 73 Criticized (Nonaccruing) — — — — — — — — — Total real estate — construction 367 778 548 206 27 24 32 5 1,987 Commercial lease financing Risk Rating: Pass 1,076 1,050 534 504 228 901 — — 4,293 Criticized (Accruing) 10 35 15 26 7 4 — — 97 Criticized (Nonaccruing) — 2 2 2 2 1 — — 9 Total commercial lease financing 1,086 1,087 551 532 237 906 — — 4,399 Total commercial loans $ 16,230 $ 10,657 $ 7,206 $ 4,635 $ 3,237 $ 7,295 $ 22,529 $ 191 $ 71,980 (a) Accrued intere st of $117 million a nd $140 million as of September 30, 2021 and December 31, 2020, respectively, presented in Other Assets on the Consolidated Balance Sheets, was excluded from the amortized cost basis disclosed in these tables. Consumer Credit Exposure Credit Risk Profile by FICO Score and Vintage (a) As of September 30, 2021 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 2021 2020 2019 2018 2017 Prior Total Real estate — residential mortgage FICO Score: 750 and above $ 6,071 $ 3,150 $ 933 $ 104 $ 141 $ 1,218 — — $ 11,617 660 to 749 1,300 407 186 47 31 323 — — 2,294 Less than 660 23 12 19 16 10 151 — — 231 No Score 19 1 1 2 4 34 1 — 62 Total real estate — residential mortgage 7,413 3,570 1,139 169 186 1,726 1 — 14,204 Home equity loans FICO Score: 750 and above 919 885 285 113 139 739 $ 2,333 $ 462 5,875 660 to 749 345 295 130 49 47 222 1,037 158 2,283 Less than 660 20 26 20 14 15 99 336 48 578 No Score — 2 — 1 — 2 5 1 11 Total home equity loans 1,284 1,208 435 177 201 1,062 3,711 669 8,747 Consumer direct loans FICO Score: 750 and above 1,287 1,271 594 76 20 137 109 — 3,494 660 to 749 413 350 200 51 13 48 217 — 1,292 Less than 660 19 22 29 12 3 14 61 — 160 No Score 47 45 32 16 9 21 208 — 378 Total consumer direct loans 1,766 1,688 855 155 45 220 595 — 5,324 Credit cards FICO Score: 750 and above — — — — — — 472 — 472 660 to 749 — — — — — — 375 — 375 Less than 660 — — — — — — 72 — 72 No Score — — — — — — 9 — 9 Total credit cards — — — — — — 928 — 928 Consumer indirect loans FICO Score: 750 and above 4 — — — — 36 — — 40 660 to 749 — — — — — 26 — — 26 Less than 660 — — — — — 11 — — 11 No Score — — — — — — — — — Total consumer indirect loans 4 — — — — 73 — — 77 Total consumer loans $ 10,467 $ 6,466 $ 2,429 $ 501 $ 432 $ 3,081 $ 5,235 $ 669 $ 29,280 As of December 31, 2020 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 2020 2019 2018 2017 2016 Prior Total Real estate — residential mortgage FICO Score: 750 and above $ 3,595 $ 1,620 $ 194 $ 254 $ 537 $ 1,211 — — $ 7,411 660 to 749 710 284 76 48 100 332 — — 1,550 Less than 660 16 28 21 10 26 170 — — 271 No Score 1 2 2 7 2 52 — — 66 Total real estate — residential mortgage 4,322 1,934 293 319 665 1,765 — — 9,298 Home equity loans FICO Score: 750 and above 1,043 404 168 202 190 839 $ 2,689 $ 590 6,125 660 to 749 385 198 82 77 69 253 1,237 206 2,507 Less than 660 27 30 18 20 20 113 426 61 715 No Score 2 2 1 — — 2 5 1 13 Total home equity loans 1,457 634 269 299 279 1,207 4,357 858 9,360 Consumer direct loans FICO Score: 750 and above 1,840 883 115 32 16 57 119 — 3,062 660 to 749 479 268 80 22 14 33 254 1 1,151 Less than 660 23 37 21 8 5 10 81 — 185 No Score 65 35 21 21 10 11 153 — 316 Total consumer direct loans 2,407 1,223 237 83 45 111 607 1 4,714 Credit cards FICO Score: 750 and above — — — — — — 488 — 488 660 to 749 — — — — — — 407 — 407 Less than 660 — — — — — — 93 — 93 No Score — — — — — — 1 — 1 Total credit cards — — — — — — 989 — 989 Consumer indirect loans FICO Score: 750 and above 1,092 924 369 188 69 66 — — 2,708 660 to 749 653 558 232 97 36 47 — — 1,623 Less than 660 143 163 99 54 25 28 — — 512 No Score 1 — — — — — — — 1 Total consumer indirect loans 1,889 1,645 700 339 130 141 — — 4,844 Total consumer loans $ 10,075 $ 5,436 $ 1,499 $ 1,040 $ 1,119 $ 3,224 $ 5,953 $ 859 $ 29,205 (a) Accrued intere st of $95 million and $101 million as of September 30, 2021 and December 31, 2020, respectively, presented in Other Assets on the Consolidated Balance Sheets, was excluded from the amortized cost basis disclosed in this table. 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 2020 Form 10-K. Under the CARES Act as well as banking regulator interagency guidance, certain loan modifications to borrowers experiencing financial distress as a result of the economic impacts created by the COVID-19 pandemic may not be required to be reported as past due. For COVID-19 related loan modifications which occurred from March 1, 2020, through September 30, 2021, and met the loan modification criteria under either the CARES Act or the criteria specified by the regulatory agencies, we have elected to re-age to current status all commercial loans and consumer loans that are not secured by real-estate and freeze the delinquency status of consumer real estate secured loans as of the modification or forbearance grant date. At September 30, 2021 , th e portfolio loans and leases in active deferral or forebearance as part of our COVID-19 hardship relief programs totaled $174 million, of which $124 million of loan modifications and forbearances made under the criteria of either the CARES Act, banking regulator interagency guidance, or short-term forbearance policies were not reported as nonperforming. The following aging analysis of past due and current loans as of September 30, 2021, and December 31, 2020, provides further information regarding Key’s credit exposure. Aging Analysis of Loan Portfolio (a) September 30, 2021 Current 30-59 Days Past Due (b) 60-89 Days Past Due (b) 90 and Greater Days Past Due (b) Non-performing Total Past Total Loans (c) Dollars in millions LOAN TYPE Commercial and industrial $ 49,161 $ 56 $ 33 $ 50 $ 253 $ 392 $ 49,553 Commercial real estate: Commercial mortgage 13,606 12 2 5 49 68 13,674 Construction 2,118 1 — 1 — 2 2,120 Total commercial real estate loans 15,724 13 2 6 49 70 15,794 Commercial lease financing 3,973 2 1 1 5 9 3,982 Total commercial loans $ 68,858 $ 71 $ 36 $ 57 $ 307 $ 471 $ 69,329 Real estate — residential mortgage $ 14,096 $ 6 $ 3 $ 6 $ 93 $ 108 $ 14,204 Home equity loans 8,559 22 10 10 146 188 8,747 Consumer direct loans 5,307 6 3 4 4 17 5,324 Credit cards 914 3 3 5 3 14 928 Consumer indirect loans 75 1 — — 1 2 77 Total consumer loans $ 28,951 $ 38 $ 19 $ 25 $ 247 $ 329 $ 29,280 Total loans $ 97,809 $ 109 $ 55 $ 82 $ 554 $ 800 $ 98,609 (a) Amounts in table represent amortized cost and exclude loans held for sale. (b) Accrued inter est of $211 million p resented in 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. December 31, 2020 Current 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 Total Loans (c) Dollars in millions LOAN TYPE Commercial and industrial $ 52,396 $ 36 $ 50 $ 40 $ 385 $ 511 $ 52,907 Commercial real estate: Commercial mortgage 12,548 9 5 21 104 139 12,687 Construction 1,986 — — 1 — 1 1,987 Total commercial real estate loans 14,534 9 5 22 104 140 14,674 Commercial lease financing 4,369 21 1 — 8 30 4,399 Total commercial loans $ 71,299 $ 66 $ 56 $ 62 $ 497 $ 681 $ 71,980 Real estate — residential mortgage $ 9,173 $ 11 $ 3 $ 1 $ 110 $ 125 $ 9,298 Home equity loans 9,143 34 20 9 154 217 9,360 Consumer direct loans 4,694 7 4 4 5 20 4,714 Credit cards 972 5 3 7 2 17 989 Consumer indirect loans 4,792 25 7 3 17 52 4,844 Total consumer loans $ 28,774 $ 82 $ 37 $ 24 $ 288 $ 431 $ 29,205 Total loans $ 100,073 $ 148 $ 93 $ 86 $ 785 $ 1,112 $ 101,185 (a) Amounts in table represent amortized cost and exclude loans held for sale. (b) Accrued interest of $241 million presented in 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, 2021, the approximate carrying amount of our commercial nonperforming loans outstanding represented 62% of their original contractual amount owed, total nonperforming loans outstanding represented 72% of their original contractual amount owed, and nonperforming assets in total were carried at 77% of their original contractual amount owed. Nonperforming loans reduced expected interest income by $6 million and $20 million for the three and nine months ended September 30, 2021,respectively, and $7 million and $20 million for the three and nine months ended September 30, 2020, respectively. The amortized cost basis of nonperforming loans on nonaccrual status for which there is no related allowance for credit losses was $492 million at September 30, 2021. 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 commercial machinery, commercial properties, and commercial real estate construction projects. Our consumer loans have collateral that includes residential real estate, automobiles, boats, and RVs. There were no significant changes in the extent to which collateral secures our collateral-dependent financial assets during the three months ended September 30, 2021 . TDRs We classify loan modifications as TDRs when a borrower is experiencing financial difficulties and we have granted a concession without commensurate financial, structural, or legal consideration. Our loan modifications are handled on a case-by-case basis and are negotiated to achieve mutually agreeable terms that maximize loan collectability and meet the borrower’s financial needs. Under the CARES Act as well as banking regulator interagency guidance, certain loan modifications to borrowers experiencing financial distress as a result of the economic impacts created by the COVID-19 pandemic may not be required to be treated as TDRs under U.S. GAAP. As of September 30, 2021, the outstanding balance of loans that underwent CO VID-19 related loan modifications for which we elected to suspend TDR accoun ting as such loan modifications met the criteria under either the CARES Act or banking regulator interagency guidance total ed $124 million. Commitments outstanding to lend additional funds to borrowers whose loan terms have been modified in TDRs w ere $21 million a nd $1 million at September 30, 2021, and December 31, 2020, respectively. The consumer TDR other concession category in the table below primarily includes those borrowers’ debts that are discharged through Chapter 7 bankruptcy and have not been formally re-affirmed. At September 30, 2021, and December 31, 2020, the recorded investment of consumer residential mortgage loans in the process of foreclosure was approximately $70 million and $92 million, respectively. The following table shows the post-modification outstanding recorded investment by concession type for our commercial and consumer accruing and nonaccruing TDRs that occurred during the periods indicated: Three Months Ended September 30, Nine Months Ended September 30, Dollars in millions 2021 2020 2021 2020 Commercial loans: Extension of Maturity Date $ — $ — $ 5 $ 8 Payment or Covenant Modification/Deferment — — 7 — Bankruptcy Plan Modification — — — — Increase in new commitment or new money — — — — Total $ — $ — $ 12 $ 8 Consumer loans: Interest rate reduction $ 3 $ 13 $ 6 $ 22 Other 12 6 18 18 Total $ 15 $ 19 $ 24 $ 40 Total TDRs $ 15 $ 19 $ 36 $ 48 The following table summarizes the change in the post-modification outstanding recorded investment of our accruing and nonaccruing TDRs during the periods indicated: Three Months Ended September 30, Nine Months Ended September 30, Dollars in millions 2021 2020 2021 2020 Balance at beginning of the period $ 334 $ 310 $ 363 $ 347 Additions 17 26 98 65 Payments (81) (22) (162) (75) Charge-offs — (8) (29) (31) Balance at end of period $ 270 $ 306 $ 270 $ 306 A further breakdown of TDRs included in nonperforming loans by loan category for the periods indicated are as follows: September 30, 2021 December 31, 2020 Number of Loans Pre-modification Outstanding Recorded Investment Post-modification Outstanding Recorded Investment Number of Loans Pre-modification Outstanding Recorded Investment Post-modification Outstanding Recorded Investment Dollars in millions LOAN TYPE Nonperforming: Commercial and industrial 35 $ 92 $ 53 66 $ 136 $ 92 Commercial real estate: Commercial mortgage 3 50 29 7 62 50 Total commercial real estate loans 3 50 29 7 62 50 Total commercial loans 38 142 82 73 198 142 Real estate — residential mortgage 218 26 25 258 35 34 Home equity loans 569 38 33 630 41 37 Consumer direct loans 201 3 3 212 3 3 Credit cards 328 2 2 356 2 2 Consumer indirect loans 23 1 1 861 15 11 Total consumer loans 1,339 70 64 2,317 96 87 Total nonperforming TDRs 1,377 212 146 2,390 294 229 Prior-year accruing: (a) Commercial and industrial 7 49 26 3 5 — Commercial real estate Commercial mortgage 1 — — — — — Total commercial real estate loans 1 — — — — — Total commercial loans 8 49 26 3 5 — Real estate — residential mortgage 464 39 34 485 37 31 Home equity loans 1,648 100 78 1,781 106 83 Consumer direct loans 206 5 3 163 4 3 Credit cards 564 4 1 536 3 1 Consumer indirect loans 150 16 8 775 29 16 Total consumer loans 3,032 164 124 3,740 179 134 Total prior-year accruing TDRs 3,040 163 124 3,743 184 134 Total TDRs 4,417 $ 375 $ 270 6,133 $ 478 $ 363 (a) All TDRs that were restructured prior to January 1, 2021, and January 1, 2020, are fully accruing. Commercial loan TDRs are considered defaulted when principal and interest payments are 90 days past due. Consumer loan TDRs are considered defaulted when principal and interest payments are more than 60 days past due. During the three months ended September 30, 2021, there were two commercial loan TDRs and 33 consumer loan TDRs with a combined recorded investment of $2 million that experienced payment defaults after modifications resulting in TDR status during 2020. During the three months ended September 30, 2020, there were no commercial loan TDRs and 33 consumer loan TDRs with a combined recorded investment of $1 million that experienced payment defaults after modifications resulting in TDR status during 2019. During the nine months ended September 30, 2021, there were five commercial loan TDRs and 98 consumer loan TDRs with a combined recorded investment of $4 million that experienced payment defaults after modifications resulting in TDR status during 2020. During the nine months ended September 30, 2020, there were no commercial loan TDRs and 160 consumer loan TDRs with a combined recorded investment of $4 million that experienced payment defaults after modifications resulting in TDR status during 2019. Liability for Credit Losses on Off Balance Sheet Exposures The liability for credit losses inherent in unfunded lending-related commitments, such as letters of credit and unfunded loan commitments, and certain financial guarantees is included in “accrued expense and other liabilities” on the balance sheet. Changes in the liability for credit losses on off balance sheet exposures are summarized as follows: Three months ended September 30, Nine months ended September 30, Dollars in millions 2021 2020 2021 2020 Balance at the end of the prior period $ 152 $ 198 $ 197 $ 68 Liability for credit losses on contingent guarantees at the end of the prior period — — — 7 Cumulative effect from change in accounting principle (a), (b) — — — 66 Balance at beginning of period 152 198 197 141 Provision (credit) for losses on off balance sheet exposures — 10 (45) 67 Balance at end of period $ 152 $ 208 $ 152 $ 208 (a) The cumulative effect from change in accounting principle relates to the January 1, 2020, adoption of ASU 2016-13. (b) The nine months ended September 30, 2020, amount exclud es $4 million related to the provision for other financial assets.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2021
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 our principal market. 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 2020 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 2020 Form 10-K. The following tables present these assets and liabilities at September 30, 2021, and December 31, 2020. September 30, 2021 December 31, 2020 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 — $ 747 — $ 747 — $ 633 — $ 633 States and political subdivisions — 91 — 91 — 24 — 24 Other mortgage-backed securities — 21 — 21 — 47 — 47 Other securities $ 17 13 — 30 — 13 — 13 Total trading account securities 17 872 — 889 — 717 — 717 Commercial loans — 13 — 13 — 18 — 18 Total trading account assets 17 885 — 902 — 735 — 735 Securities available for sale: U.S. Treasury, agencies and corporations — 8,938 — 8,938 — 1,000 — 1,000 States and political subdivisions — — — — — — — — Agency residential collateralized mortgage obligations — 16,104 — 16,104 — 14,273 — 14,273 Agency residential mortgage-backed securities — 5,408 — 5,408 — 2,164 — 2,164 Agency commercial mortgage-backed securities — 10,121 — 10,121 — 10,106 — 10,106 Other securities — 1 $ 22 23 — — $ 13 13 Total securities available for sale — 40,572 22 40,594 — 27,543 13 27,556 Other investments: Principal investments: Direct — — 1 1 — — 1 1 Indirect (measured at NAV) (a) — — — 48 — — — 53 Total principal investments — — 1 49 — — 1 54 Equity investments: Direct — — 9 9 — — 13 13 Direct (measured at NAV) (a) — — — 16 — — — 7 Indirect (measured at NAV) (a) — — — 6 — — — 7 Total equity investments — — 9 31 — — 13 27 Total other investments — — 10 80 — — 14 81 Loans, net of unearned income (residential) — — 10 10 — — 11 11 Loans held for sale (residential) — 237 — 237 — 264 — 264 Derivative assets: Interest rate — 920 34 954 — 1,528 56 1,584 Foreign exchange 65 15 — 80 $ 78 31 — 109 Commodity — 1,799 — 1,799 — 424 2 426 Credit — — — — — — 1 1 Other — 16 6 22 — 26 32 58 Derivative assets 65 2,750 40 2,855 78 2,009 91 2,178 Netting adjustments (b) — — — (302) — — — (380) Total derivative assets 65 2,750 40 2,553 78 2,009 91 1,798 Accrued income and other assets — — — — — — — — Total assets on a recurring basis at fair value $ 82 $ 44,444 $ 82 $ 44,376 $ 78 $ 30,551 $ 129 $ 30,445 LIABILITIES MEASURED ON A RECURRING BASIS Bank notes and other short-term borrowings: Short positions $ 212 $ 555 — $ 767 $ 256 $ 503 — $ 759 Derivative liabilities: Interest rate — 273 — 273 — 288 — 288 Foreign exchange 60 15 — 75 72 31 — 103 Commodity — 1,805 — 1,805 — 408 — 408 Credit — 1 $ 6 7 — — $ 11 11 Other — 11 — 11 — 16 — 16 Derivative liabilities 60 2,105 6 2,171 72 743 11 826 Netting adjustments (b) — — — (1,911) — — — (675) Total derivative liabilities 60 2,105 6 260 72 743 11 151 Total liabilities on a recurring basis at fair value $ 272 $ 2,660 $ 6 $ 1,027 $ 328 $ 1,246 $ 11 $ 910 (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, 2021, as well as financial support provided for the three and nine months ended September 30, 2021, and September 30, 2020. Financial support provided Three months ended September 30, Nine months ended September 30, September 30, 2021 2021 2020 2021 2020 Dollars in millions Fair Value Unfunded Commitments Funded Commitments Funded Other Funded Commitments Funded Other Funded Commitments Funded Other Funded Commitments Funded Other INVESTMENT TYPE Direct investments $ 1 — — — — — — — — — Indirect investments (measured at NAV) (a) 48 $ 13 $ — — 1 — $ 4 — $ 1 — Total $ 49 $ 13 $ — — 1 — $ 4 — $ 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, 2021, 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, 2021, and September 30, 2020. 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, 2021 Securities available for sale Other securities $ 13 $ 9 — — — — — — — $ 22 — Other investments Principal investments Direct (a) 1 — — — — — — — — 1 — Equity investments Direct (a) 13 — $ (1) — — — — — $ (3) 9 $ (1) Loans held for sale (residential) — — — — $ (1) — $ 1 — — — — Loans, net of unearned income (residential) 11 — — — (2) — 1 — — 10 — Derivative instruments (b) Interest rate 56 — (20) (c) $ 1 (7) — — $ 21 (d) (17) (d) 34 — Credit (10) — 4 (c) — — — — — — (6) — Other (e) 32 — (3) (c) — — — (23) — — 6 — Three months ended September 30, 2021 Securities available for sale Other securities $ 22 — — — — — — — — $ 22 — Other investments Principal investments Direct (a) 1 — — — — — — — — 1 — Equity investments Direct (a) 9 — — — — — — — — 9 — Loans held for sale (residential) — — — — — — — — — — — Loans, net of unearned income (residential) 11 — — — (1) — — — — 10 — Derivative instruments (b) Interest rate 35 — $ (5) (c) $ 1 $ (1) — — $ 9 (d) $ (5) (d) 34 — Credit (5) — — (1) — — — — (6) — Other (e) 13 — — (c) — — — $ (7) — — 6 — 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, 2020 Trading account assets Other mortgage-backed securities — — — — $ (9) — — $ 36 — $ 27 — Securities available for sale Other securities $ 11 $ 1 — — — — — — — 12 — Other investments Principal investments Direct (a) 1 — — — — — — — — 1 — Equity investments Direct (a) 12 — $ — — — — — — — 12 — Loans held for sale (residential) — — — — (10) — $ 11 — — 1 — Loans, net of unearned income (residential) 4 — — — (2) — 6 — — 8 — Derivative instruments (b) Interest rate 22 — $ 18 (c) $ 14 (5) — — $ 98 (d) $ (66) (d) 81 — Credit (8) — (6) (c) $ 1 — — — (13) — Other (e) 5 — — — — — 39 — — 44 — Three months ended September 30, 2020 Trading account assets Other mortgage-backed securities $ 36 — — — $ (9) $ — — $ — — $ 27 $ — Securities available for sale Other securities 12 — — — — — — — — 12 — Other investments Principal investments Direct (a) 1 — — — — — — — — 1 — Equity investments Direct (a) 12 $ — 12 — Loans held for sale (residential) — — — — $ — — $ 1 — — 1 — Loans, net of unearned income (residential) 5 — — — — — 3 — — 8 — Derivative instruments (b) Interest rate 52 $ (3) (c) $ 2 $ (4) $ 36 (d) $ (2) (d) 81 Credit (17) — 4 (c) — — — — — — (13) — Other (e) 46 — 5 — — (7) — 44 — (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 2020 Form 10-K. There were no liabilities measured at fair value on a nonrecurring basis at September 30, 2021, and December 31, 2020. The following table presents our assets measured at fair value on a nonrecurring basis at September 30, 2021, and December 31, 2020: September 30, 2021 December 31, 2020 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 — — $ 5 $ 5 — — $ 108 $ 108 Accrued income and other assets — — 74 74 — $ — 56 56 Total assets on a nonrecurring basis at fair value — — $ 79 $ 79 — — $ 164 $ 164 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, 2021, and December 31, 2020, the carrying amount of equity investments under this method was $168 million and $171 million, respectively. No impairment was recorded for the three months ended September 30, 2021. Quantitative Information about Level 3 Fair Value Measurements The range and weighted-average of the significant unobservable inputs used to fair value our material Level 3 recurring and nonrecurring assets at September 30, 2021, and December 31, 2020, along with the valuation techniques used, are shown in the following table: Level 3 Asset (Liability) Valuation Technique Significant Unobservable Input Range (Weighted-Average) (b), (c) Dollars in millions September 30, 2021 December 31, 2020 September 30, 2021 December 31, 2020 Recurring Securities available-for-sale: Other securities $ 22 13 Discounted cash flows Discount rate N/A (16.61%) N/A (15.09%) Marketability discount N/A (30.00%) N/A (30.00%) Volatility factor N/A (55.00%) N/A (44.00%) Other investments: (a) Equity investments Direct 9 13 Discounted cash flows Discount rate N/A (14.15%) 13.90 - 17.04% (15.47%) Marketability discount N/A N/A (30.00%) Volatility factor N/A N/A (52.00%) Loans, net of unearned income (residential) 10 11 Market comparable pricing Comparability factor 64.50 - 97.30% (94.13%) 64.50-99.04% (94.17%) Derivative instruments: Interest rate 34 56 Discounted cash flows Probability of default .02 - 100% (16.60%) .02 - 100% (7.90%) Internal risk rating 1 - 19 (15.133) 1 - 19 (9.675) Loss given default 0 - 1 (.500) 0 - 1 (.483) Credit (assets) — 1 Discounted cash flows Probability of default .02 - 100% (3.10%) .02 - 100% (4.70%) Internal risk rating 1 - 19 (9.024) 1 - 19 (10.478) Loss given default 0 - 1 (.498) 0 - 1 (.490) Credit (liabilities) (6) (11) Discounted cash flows Probability of default .02 - 100% (14.91%) .02 - 100% (15.45%) Internal risk rating 1 - 19 (8.197) 1 - 19 (8.555) Loss given default 0 - 1 (.422) 0 - 1 (.431) Other (d) 6 32 Discounted cash flows Loan closing rates 5.90 - 99.70% (85.17%) 36.95 - 99.68% (77.51%) Nonrecurring Collateral-dependent loans 5 108 Fair value of collateral Discount rate 0 - 0.00% (0.00%) 0 - 100.00% (36.00%) Accrued income and other assets: OREO and other Level 3 assets (e) 12 16 Appraised value Appraised value N/M N/M (a) Principal investments, direct is excluded from this table as the balance at September 30, 2021, and December 31, 2020, is insignificant (less than $1 million). (b) The weighted average of significant unobservable inputs is calculated using a weighting relative to fair value. (c) For significant unobservable inputs with no range, a single figure is reported to denote the single quantitative factor used. (d) Amounts represent interest rate lock commitments. (e) Excludes $62 million and $40 million pertaining to servicing assets at September 30, 2021, and December 31, 2020, 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, 2021, and December 31, 2020, are shown in the following tables. Assets and liabilities are further arranged by measurement category. September 30, 2021 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) $ 902 $ 17 $ 885 — — — $ 902 Other investments (b) 607 — — $ 537 $ 70 — 607 Loans, net of unearned income (residential) (d) 10 — — 10 — — 10 Loans held for sale (residential) (b) 237 — 237 — — — 237 Derivative assets - trading (b) 2,469 65 2,739 7 — $ (342) (f) 2,469 Fair value - OCI Securities available for sale (b) 40,594 — 40,572 22 — — 40,594 Derivative assets - hedging (b)(g) 84 — 45 — — 39 (f) 84 Amortized cost Held-to-maturity securities (c) 8,423 — 8,664 — — — 8,664 Loans, net of unearned income (d) 97,515 — — 97,435 — — 97,435 Loans held for sale (b) 1,568 — — 1,568 — — 1,568 Other Cash and other short-term investments (a) 20,371 20,371 — — — — 20,371 LIABILITIES (by measurement category) Fair value - net income Derivative liabilities - trading (b) $ 249 $ 60 $ 2,093 $ 7 — $ (1,911) (f) $ 249 Fair value - OCI Derivative liabilities - hedging (b)(g) 11 — 11 — — — (f) 11 Amortized cost Time deposits (e) 4,205 — 4,214 — — — 4,214 Short-term borrowings (a) 995 212 783 — — — 995 Long-term debt (e) 13,165 13,076 716 — — — 13,792 Other Deposits with no stated maturity (a) 147,726 — 147,726 — — — 147,726 December 31, 2020 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) $ 735 — $ 735 — — — $ 735 Other investments (b) 621 — — $ 555 $ 66 — 621 Loans, net of unearned income (residential) (d) 11 — — 11 — — 11 Loans held for sale (residential) (b) 264 — 264 — — — 264 Derivative assets - trading (b) 1,676 $ 78 1,939 91 — $ (433) (f) 1,675 Fair value - OCI Securities available for sale (b) 27,556 — 27,543 13 — — 27,556 Derivative assets - hedging (b)(g) 123 — 70 — — 53 (f) 123 Amortized cost Held-to-maturity securities (c) 7,595 — 8,023 — — — 8,023 Loans, net of unearned income (d) 99,548 — — 98,946 — — 98,946 Loans held for sale (b) 1,319 — — 1,319 — — 1,319 Other Short-term investments - U.S. Treasury Bills (b) — — — — — — — Cash and other short-term investments (a) 17,285 17,285 — — — — 17,285 LIABILITIES (by measurement category) Fair value - net income Derivative liabilities - trading (b) $ 154 $ 72 $ 746 $ 11 — $ (675) (f) $ 154 Fair value - OCI Derivative liabilities - hedging (b)(g) (3) — (3) — — — (f) (3) Amortized cost Time deposits (e) 5,743 — 5,765 — — — 5,765 Short-term borrowings (a) 979 256 723 — — — 979 Long-term debt (e) 13,709 13,925 734 — — — 14,659 Other Deposits with no stated maturity (a) 129,539 — 129,539 — — — 129,539 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 2020 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 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 (“1. Summary of Significant Accounting Policies”) under the heading “Derivatives and Hedging” beginning on page 114 of our 2020 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, and loans in portfolio recorded at fair value. All of these loans were excluded from the table above as follows: • Loans at carrying value, net of allowance, of $602 million ($518 million at fair value) at September 30, 2021, and $674 million ($567 million at fair value) at December 31, 2020; • Portfolio loans at fair value of $2 million at September 30, 2021, and $2 million at December 31, 2020. 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, 2021
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, 2021 December 31, 2020 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 $ 8,960 — $ 22 $ 8,938 $ 1,000 — — $ 1,000 Agency residential collateralized mortgage obligations 16,143 $ 168 207 16,104 14,001 $ 297 $ 25 14,273 Agency residential mortgage-backed securities 5,409 51 52 5,408 2,094 70 — 2,164 Agency commercial mortgage-backed securities 10,141 253 273 10,121 9,707 432 33 10,106 Other securities 8 15 23 8 5 — 13 Total securities available for sale $ 40,661 $ 487 $ 554 $ 40,594 $ 26,810 $ 804 $ 58 $ 27,556 HELD-TO-MATURITY SECURITIES Agency residential collateralized mortgage obligations $ 2,485 $ 69 — $ 2,554 $ 3,775 $ 124 — $ 3,899 Agency residential mortgage-backed securities 184 7 — 191 271 14 — 285 Agency commercial mortgage-backed securities 2,901 165 — 3,066 3,515 290 — 3,805 Asset-backed securities (c) 2,837 — — 2,837 19 — — 19 Other securities 16 — — 16 15 — — 15 Total held-to-maturity securities $ 8,423 $ 241 — $ 8,664 $ 7,595 $ 428 $ — $ 8,023 (a) Amortized cost amounts exclude accrued interes t receivable which is recorded within Other Assets on the balance sheet. At September 30, 2021, accrued interest receivable on available for sale securities and held-to-maturity securities totaled $53 million and $15 million, respectively. (b) Amortized cost amounts exclude accrued interes t receivable which is recorded within Other Assets on the balance sheet. At December 31, 2020, accrued interest receivable on available for sale securities and held-to-maturity securities totaled $42 million and $15 million , respectively. (c) Includes $2.8 billion of securities as of September 30, 2021 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, 2021, and December 31, 2020. 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, 2021 Securities available for sale: U.S Treasury, agencies, and corporations $ 8,938 $ 22 — — $ 8,938 $ 22 Agency residential collateralized mortgage obligations 7,647 150 $ 868 $ 57 8,515 207 Agency residential mortgage-backed securities 3,619 52 6 — (a) 3,625 52 Agency commercial mortgage-backed securities 4,219 215 1,093 58 5,312 273 Held-to-maturity securities: Asset-backed securities 1 — (a) 1 — 2 — Other securities 8,460 — (a) — — (a) 8,460 — Total securities in an unrealized loss position $ 32,884 $ 439 $ 1,968 $ 115 $ 34,852 $ 554 December 31, 2020 Securities available for sale: Agency residential collateralized mortgage obligations $ 2,110 $ 25 — — $ 2,110 $ 25 Agency residential mortgage-backed securities 6 — (b) $ 5 — (b) 11 — Agency commercial mortgage-backed securities 2,709 33 — — 2,709 33 Held-to-maturity securities: Agency residential collateralized mortgage obligations — — 24 — (b) 24 — Other securities 5 — (b) — — 5 — Total securities in an unrealized loss position $ 4,830 $ 58 $ 29 — $ 4,859 $ 58 (a) At September 30, 2021, gross unrealized losses totaled less than $1 million for asset-backed securities and other securities held-to-maturity with a loss duration of less than 12 months and asset-backed securities held-to-maturity with a loss duration of 12 months or longer. At September 30, 2021, gross unrealized losses totaled less than $1 million for agency residential mortgage-backed securities available for sale with a loss duration greater than 12 months. (b) At December 31, 2020, gross unrealized losses totaled less than $1 million for agency residential mortgage-backed securities available for sale with a loss duration of less than 12 months and less than $1 million for other securities held-to-maturity with a loss duration of less than 12 months. At December 31, 2020, gross unrealized losses totaled less than $1 million for agency residential mortgage-backed securities available for sale with a loss duration greater than 12 months or longer and less than $1 million for agency residential collateralized mortgage obligations held to maturity with a loss duration greater than 12 months or longer. Based on our evaluation at September 30, 2021, 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. At September 30, 2021, securities available for sale and held-to-maturity securities totaling $14.7 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. 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, 2021 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 $ 230 $ 247 $ 93 $ 95 Due after one through five years 19,818 20,076 6,330 6,452 Due after five through ten years 17,312 17,128 2,000 2,117 Due after ten years 3,301 3,143 — — Total $ 40,661 $ 40,594 $ 8,423 $ 8,664

Derivatives and Hedging Activit

Derivatives and Hedging Activities	9 Months Ended
	Sep. 30, 2021
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, 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 meet client financing and hedging needs. At September 30, 2021, after taking into account the effects of bilateral collateral and master netting agreements, we had $84 million of derivative assets and $11 million of derivative liabilities that relate to contracts entered into for hedging purposes. 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 $2.5 billion and derivative liabilities of $249 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 108 of our 2020 Form 10-K. Our derivative strategies and related risk management objectives are described in Note 8 (“Derivatives and Hedging Activities”) beginning on page 143 of our 2020 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, 2021, and December 31, 2020. The derivative asset and liability balances are presented on a gross basis, prior to the application of bilateral collateral and master netting agreements, but after the variation margin payments with central clearing organizations have been applied as settlement, as applicable. 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 balance sheet, as follows: September 30, 2021 December 31, 2020 Fair Value Fair Value Dollars in millions Notional Amount Derivative Assets Derivative Liabilities Notional Amount Derivative Assets Derivative Liabilities Derivatives designated as hedging instruments: Interest rate $ 36,423 $ 45 $ 11 $ 36,135 $ 70 $ (3) Derivatives not designated as hedging instruments: Interest rate 72,688 909 262 78,424 1,514 291 Foreign exchange 7,378 80 75 6,385 109 103 Commodity 15,090 1,799 1,805 9,702 426 408 Credit 339 — 7 423 1 11 Other (a) 3,652 22 11 4,951 58 16 Total 99,147 2,810 2,160 99,885 2,108 829 Netting adjustments (b) — (302) (1,911) — (380) (675) Net derivatives in the balance sheet 135,570 2,553 260 136,020 1,798 151 Other collateral (c) — (1) (30) — (2) (11) Net derivative amounts $ 135,570 $ 2,552 $ 230 $ 136,020 $ 1,796 $ 140 (a) Other derivatives include interest rate lock commitments and 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. (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. (c) 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-month period ended September 30, 2021, 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, 2021, and December 31, 2020, related to cumulative basis adjustments for fair value hedges. September 30, 2021 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 $ 8,077 $ 205 Interest rate contracts Securities Available for Sale (c) 6,280 168 December 31, 2020 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 $ 8,182 $ 416 Interest rate contracts Securities Available for Sale (c) 2,080 21 (a) The carrying amount represents the portion of the 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 ent by $7 million and $8 million at September 30, 2021, and December 31, 2020, respectively, (c) These amounts are designed as fair value hedges under the last-of-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, 2021, and December 31, 2020, the amortized costs of the closed portfolios in these hedging relationships was $7.7 billion and $2.5 billion, respectively. Cash flow hedges. During the nine-month period ended September 30, 2021, we did not exclude any portion of cash flow hedging instruments from the assessment of hedge effectiveness. Considering the inter est rates, yield curves, and notional amounts as of September 30, 2021, we expect to reclassify an estimated $167 million of after-tax net gains on derivative instruments designated as cash flow hedges from AOCI to income during the next 12 m onths. In addition, we expect to reclassify approxi mately $6 million of n et gains related to terminated cash flow hedges from AOCI to income during the next 12 months. As of September 30, 2021, the maximum length of time over which we hedge forecasted transac tions is 5.9 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, 2021, and September 30, 2020. 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 Interest expense - deposits Other income Three months ended September 30, 2021 Total amounts presented in the consolidated statement of income $ (54) $ 882 $ 135 $ 235 $ (15) $ 25 Net gains (losses) on fair value hedging relationships Interest contracts Recognized on hedged items 37 — (38) — — — Recognized on derivatives designated as hedging instruments (8) — 39 — — — Net income (expense) recognized on fair value hedges $ 29 — $ 1 — — — Net gain (loss) on cash flow hedging relationships Interest contracts Realized gains (losses) (pre-tax) reclassified from AOCI into net income $ (1) $ 79 $ — $ (1) — — Net income (expense) recognized on cash flow hedges $ (1) $ 79 — $ (1) — — Three months ended September 30, 2020 Total amounts presented in the consolidated statement of income $ (64) $ 927 $ 115 $ 146 $ (54) $ 28 Net gains (losses) on fair value hedging relationships Interest contracts Recognized on hedged items $ 47 — — — — — Recognized on derivatives designated as hedging instruments (7) — — — — — Net income (expense) recognized on fair value hedges $ 40 — — — — — Net gain (loss) on cash flow hedging relationships Interest contracts Realized gains (losses) (pre-tax) reclassified from AOCI into net income $ (1) $ 100 — — — — Net income (expense) recognized on cash flow hedges $ (1) $ 100 — — — — 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 Interest expense - deposits Other income Nine months ended September 30, 2021 Total amounts presented in the consolidated statement of income $ (168) $ 2,659 $ 398 $ 614 $ (52) $ 89 Net gains (losses) on fair value hedging relationships Interest contracts Recognized on hedged items 210 — (147) — — — Recognized on derivatives designated as hedging instruments (113) — 147 — — — Net income (expense) recognized on fair value hedges $ 97 — — — — — Net gain (loss) on cash flow hedging relationships Interest contracts Realized gains (losses) (pre-tax) reclassified from AOCI into net income $ (3) $ 253 — — — — Net income (expense) recognized on cash flow hedges $ (3) $ 253 — — — — Nine months ended September 30, 2020 Total amounts presented in the consolidated statement of income $ (225) $ 2,933 $ 365 $ 418 $ (319) $ (27) Net gains (losses) on fair value hedging relationships Interest contracts Recognized on hedged items $ (252) — — — — — Recognized on derivatives designated as hedging instruments 343 — — — — — Net income (expense) recognized on fair value hedges $ 91 — — — — — Net gain (loss) on cash flow hedging relationships Interest contracts Realized gains (losses) (pre-tax) reclassified from AOCI into net income $ (3) $ 224 — — — — Net income (expense) recognized on cash flow hedges $ (3) $ 224 — — — — 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, 2021, and September 30, 2020, 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, 2021 Cash Flow Hedges Interest rate $ (2) Interest income — Loans $ 79 Interest rate — Interest expense — Long-term debt (1) Interest rate 4 Investment banking and debt placement fees (1) Total $ 2 $ 77 Three months ended September 30, 2020 Cash Flow Hedges Interest rate $ 5 Interest income — Loans $ 100 Interest rate — Interest expense — Long-term debt (1) Interest rate 10 Investment banking and debt placement fees — Total $ 15 $ 99 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, 2021 Cash Flow Hedges Interest rate $ (144) Interest income — Loans $ 253 Interest rate 2 Interest expense — Long-term debt (3) Interest rate 9 Investment banking and debt placement fees — Net Investment Hedges Foreign exchange contracts — Other Income — Total $ (133) $ 250 Nine months ended September 30, 2020 Cash Flow Hedges Interest rate $ 629 Interest income — Loans $ 224 Interest rate (6) Interest expense — Long-term debt (3) Interest rate (10) Investment banking and debt placement fees — Net Investment Hedges Foreign exchange contracts — Other Income — Total $ 613 $ 221 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, 2021, and September 30, 2020, and where they are recorded on the income statement. Three months ended September 30, 2021 Three months ended September 30, 2020 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 — — $ 8 $ 5 — $ (1) $ 4 Foreign exchange 12 — — 12 9 — — 9 Commodity 4 — — 4 5 — — 5 Credit 1 — $ (9) (8) 4 — (8) (4) Other — $ — — — — $ 28 (8) 20 Total net gains (losses) $ 25 $ — $ (9) $ 16 $ 23 $ 28 $ (17) $ 34 Nine months ended September 30, 2021 Nine months ended September 30, 2020 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 $ 19 — $ 1 $ 20 $ 23 — $ (10) $ 13 Foreign exchange 34 — — 34 29 — — 29 Commodity 12 — — 12 13 — — 13 Credit 5 — (27) (22) (6) — (20) (26) Other — $ 13 (22) (9) — $ 36 17 53 Total net gains (losses) $ 70 $ 13 $ (48) $ 35 $ 59 $ 36 $ (13) $ 82 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 $49 million was nette d against derivative assets on the balance sheet at September 30, 2021, compa red to $63 million of cash collateral netted against derivative assets at December 31, 2020. The cash collateral netted against derivative liabilities totaled $1.6 billion at September 30, 2021, and $232 million at December 31, 2020. 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 147 of our 2020 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 gross 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, 2021 December 31, 2020 Interest rate $ 838 $ 1,448 Foreign exchange 38 52 Commodity 1,606 178 Credit — (1) Other 22 58 Derivative assets before collateral 2,504 1,735 Plus(Less): Related collateral 49 63 Total derivative assets $ 2,553 $ 1,798 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, 2021, we had gross exposure of $159 million to broker-dealers and banks. We had net exposure of $175 million after the application of master netting agreements and cash collateral, where such qualifying agreements exist. We had net exposure of $173 million after considering $2 million of additional collateral held in the form of securities. 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. For transactions that are not clearable, we mitigate our market risk by buying and selling U.S. Treasuries and Eurodollar 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 $25 million at September 30, 2021. The CVA is calculated from potential future exposures, expected recovery rates, and market-implied probabilities of default. At September 30, 2021, we had gross exposure of $2.5 billion 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 $2.4 billion on 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 of $7 million as of September 30, 2021, and $9 million as of December 31, 2020. 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 148 of our 2020 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, 2021, and December 31, 2020. 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, 2021 December 31, 2020 Dollars in millions Notional Amount Average Term (Years) Payment / Performance Risk Notional Amount Average Term (Years) Payment / Performance Risk Other $ 146 13.04 17.88 % $ 227 12.76 19.53 % Total credit derivatives sold $ 146 — — $ 227 — — 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, 2021, KeyBank’s rating was “A3” with Moody’s and “A-” with S&P, and KeyCorp’s rating was “Baa1” with Moody’s and “BBB+” with S&P. As of September 30, 2021, the aggregate fair value of all derivative contracts with credit risk contingent features (i.e., those containing collateral posting or termination provisions based on our ratings) held by KeyBank that were in a net liability position totaled $1.7 billion, which was comprised of $194 million in derivative assets and $1.9 billion in derivative liabilities. We had $1.6 billion in cash and securities collateral posted to cover those positions as of September 30, 2021. There were no derivative contracts with credit risk contingent features held by KeyCorp at September 30, 2021. The following table summarizes the additional cash and securities collateral that KeyBank would have been required to deliver under the ISDA Master Agreements had the credit risk contingent features been triggered for the derivative contracts in a net liability position as of September 30, 2021, and December 31, 2020. The additional collateral amounts were calculated based on scenarios under which KeyBank’s ratings are downgraded one, two, or three ratings as of September 30, 2021, and December 31, 2020, and take into account all collateral already posted. A similar calculation was performed for Ke yCorp, and no addition al collateral would have been required as of September 30, 2021, and December 31, 2020. For more information about the credit ratings for KeyBank and KeyCorp, see the discussion under the heading “Factors affecting liquidity” in the section entitled “Liquidity risk management” in Item 2 of this report. September 30, 2021 December 31, 2020 Dollars in millions Moody’s S&P Moody’s S&P KeyBank’s long-term senior unsecured credit ratings A3 A- A3 A- One rating downgrade $ 2 $ 2 $ 1 $ 1 Two rating downgrades 3 3 1 1 Three rating downgrades 3 3 1 1 KeyBank’s long-term senior unsecured credit rating was four ratings above noninvestment grade at Moody’s and S&P as of September 30, 2021, and December 31, 2020. If Key Bank’s ratings had been downgraded below investment grade as of September 30, 2021, or December 31, 2020, payments of $4 million and $2 million, respectively, would have been required to either terminate the contracts or post additional collateral for th ose contracts in a net liability position, taking into account all collateral already posted. If KeyCorp’s ratings had been downgraded below investment grade as of September 30, 2021, or December 31, 2020, no payments would have been required to either terminate the contracts or post additional collateral for those contracts in a net liability position, taking into account all collateral already posted.

Mortgage Servicing Assets

Mortgage Servicing Assets	9 Months Ended
	Sep. 30, 2021
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 115 of our 2020 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 2021 2020 2021 2020 Balance at beginning of period $ 600 $ 565 $ 578 $ 539 Servicing retained from loan sales 31 30 88 107 Purchases 8 6 22 24 Amortization (30) (29) (89) (88) Temporary (impairments) recoveries — (6) 10 (16) Balance at end of period $ 609 $ 566 $ 609 $ 566 Fair value at end of period $ 735 $ 685 $ 735 $ 685 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, 2021, and September 30, 2020, along with the valuation techniques, are shown in the following table: dollars in millions September 30, 2021 September 30, 2020 Valuation Technique Significant Unobservable Input Range Weighted Average Range Weighted Average Discounted cash flow Expected defaults 1.00 % 2.00 % 1.15 % 1.00 % 2.00 % 1.17 % Residual cash flows discount rate 7.64 % 10.49 % 9.31 % 7.72 % 10.66 % 9.30 % Escrow earn rate 1.04 % 1.37 % 1.04 % 0.92 % 1.16 % 1.05 % Loan assumption rate — % 1.71 % 1.40 % — % 1.78 % 1.39 % 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 $193 million for the nine-month period ended September 30, 2021, and $154 million for the nine-month period ended September 30, 2020. This fee income was offset by $89 million of amortization for the nine-month period ended September 30, 2021, and $88 million for the nine-month period ended September 30, 2020. 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 2021 2020 2021 2020 Balance at beginning of period $ 77 $ 46 $ 58 $ 46 Servicing retained from loan sales 9 12 32 25 Purchases — — — — Amortization (4) (4) (14) (9) Temporary (impairments) recoveries 3 (1) 9 (9) Balance at end of period $ 85 $ 53 $ 85 $ 53 Fair value at end of period $ 89 $ 54 $ 89 $ 54 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, 2021, and September 30, 2020, along with the valuation techniques, are shown in the following table: September 30, 2021 September 30, 2020 Valuation Technique Significant Unobservable Input Range Weighted Average Range Weighted Average Discounted cash flow Prepayment speed 8.03 % 48.88 % 11.67 % 12.35 % 53.36 % 16.89 % Discount rate 7.50 % 8.57 % 7.54 % 7.51 % 8.80 % 7.57 % Servicing cost $ 62.00 $ 4,375 $ 68.15 $ 62.00 $ 5,125 $ 81.67 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 servicing assets for September 30, 2021, 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 $30 million for the nine-month period ended September 30, 2021, and $24 million for the nine-month period ended September 30, 2020. This fee income was offset by $14 million of amortization for the nine-month period ended September 30, 2021, and $9 million for the nine-month period ended September 30, 2020. 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, 2021
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 152 of our 2020 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 2021 2020 2021 2020 Sales-type and direct financing leases Interest income on lease receivable $ 13 $ 36 $ 59 $ 91 Interest income related to accretion of unguaranteed residual asset 9 (7) 12 (1) Total sales-type and direct financing lease income 22 29 71 90 Operating leases Operating lease income related to lease payments 31 34 95 103 Other operating leasing gains 6 4 16 25 Total operating lease income and other leasing gains 36 38 111 128 Total lease income $ 58 $ 67 $ 182 $ 218 In April 2020, the FASB provided elections under which entities can choose to account for eligible rent concessions either by applying the existing lease modification accounting guidance or by applying an expedient to account for
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 152 of our 2020 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 2021 2020 2021 2020 Sales-type and direct financing leases Interest income on lease receivable $ 13 $ 36 $ 59 $ 91 Interest income related to accretion of unguaranteed residual asset 9 (7) 12 (1) Total sales-type and direct financing lease income 22 29 71 90 Operating leases Operating lease income related to lease payments 31 34 95 103 Other operating leasing gains 6 4 16 25 Total operating lease income and other leasing gains 36 38 111 128 Total lease income $ 58 $ 67 $ 182 $ 218 In April 2020, the FASB provided elections under which entities can choose to account for eligible rent concessions either by applying the existing lease modification accounting guidance or by applying an expedient to account for
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 152 of our 2020 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 2021 2020 2021 2020 Sales-type and direct financing leases Interest income on lease receivable $ 13 $ 36 $ 59 $ 91 Interest income related to accretion of unguaranteed residual asset 9 (7) 12 (1) Total sales-type and direct financing lease income 22 29 71 90 Operating leases Operating lease income related to lease payments 31 34 95 103 Other operating leasing gains 6 4 16 25 Total operating lease income and other leasing gains 36 38 111 128 Total lease income $ 58 $ 67 $ 182 $ 218 In April 2020, the FASB provided elections under which entities can choose to account for eligible rent concessions either by applying the existing lease modification accounting guidance or by applying an expedient to account for
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 152 of our 2020 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 2021 2020 2021 2020 Sales-type and direct financing leases Interest income on lease receivable $ 13 $ 36 $ 59 $ 91 Interest income related to accretion of unguaranteed residual asset 9 (7) 12 (1) Total sales-type and direct financing lease income 22 29 71 90 Operating leases Operating lease income related to lease payments 31 34 95 103 Other operating leasing gains 6 4 16 25 Total operating lease income and other leasing gains 36 38 111 128 Total lease income $ 58 $ 67 $ 182 $ 218 In April 2020, the FASB provided elections under which entities can choose to account for eligible rent concessions either by applying the existing lease modification accounting guidance or by applying an expedient to account for
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 152 of our 2020 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 2021 2020 2021 2020 Sales-type and direct financing leases Interest income on lease receivable $ 13 $ 36 $ 59 $ 91 Interest income related to accretion of unguaranteed residual asset 9 (7) 12 (1) Total sales-type and direct financing lease income 22 29 71 90 Operating leases Operating lease income related to lease payments 31 34 95 103 Other operating leasing gains 6 4 16 25 Total operating lease income and other leasing gains 36 38 111 128 Total lease income $ 58 $ 67 $ 182 $ 218 In April 2020, the FASB provided elections under which entities can choose to account for eligible rent concessions either by applying the existing lease modification accounting guidance or by applying an expedient to account for

Goodwill

Goodwill	9 Months Ended
	Sep. 30, 2021
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 115 of our 2020 Form 10-K. The fair values of each reporting unit are estimated using a combination of market and income approaches. In our latest quantitative test as of September 30, 2020, the income approach, which was weighted at 75%, utilized discounted cash flow projections for each reporting unit. The market approach, which was weighted at 25%, consisted primarily of public company metrics but also considered recent transactions in the financial services industry. The carrying amounts of Key’s reporting units represent the combination of regulatory and economic equity for goodwill impairment testing and management reporting purposes. Changes in the carrying amount of goodwill by reporting segment are presented in the following table: Dollars in millions Consumer Bank Commercial Bank Total BALANCE AT SEPTEMBER 30, 2020 $ 1,752 $ 912 $ 2,664 BALANCE AT BALANCE AT DECEMBER 31, 2020 $ 1,752 $ 912 $ 2,664 AQN Strategies acquisition 9 — 9 BALANCE AT SEPTEMBER 30, 2021 $ 1,761 $ 912 $ 2,673

Variable Interest Entities

Variable Interest Entities	9 Months Ended
	Sep. 30, 2021
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 156 of our 2020 Form 10-K. LIHTC investments. We had $1.5 billion and $1.4 billion of investments in LIHTC operating partnerships at September 30, 2021, and December 31, 2020, respectively. These investments are recorded in “accrued income and other assets” on our balance sheet. 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, 2021, and December 31, 2020, we had liabilities of $608 million and $484 million, respectively, related to investments in qualified affordable housing projects, which are recorded in “accrued expenses and other liabilities” on our balance sheet. We continue to invest in these LIHTC operating partnerships. Through KCIC, formed as a wholly-owned subsidiary of KeyBank National Association, we create funds that hold interests in LIHTC investments. KCIC is the managing member of the fund. We have determined that we are not the primary beneficiary of the fund because although we have the power to direct the activities that most significantly influence its economic performance, we do not have benefits that could potentially be deemed significant to the fund. Therefore, we do not consolidate the fund. The assets and liabilities presented in the table below convey the size of KCDC’s direct and indirect investments at September 30, 2021, and December 31, 2020. As these investments represent unconsolidated VIEs, the assets and liabilities of the investments themselves are not recorded on our balance sheet. Additional information pertaining to our LIHTC investments is included in Note 13 (“Variable Interest Entities”) beginning on page 156 of our 2020 Form 10-K. Unconsolidated VIEs Dollars in millions Total Assets Total Liabilities Maximum Exposure to Loss September 30, 2021 LIHTC investments $ 7,389 $ 2,861 $ 1,882 December 31, 2020 LIHTC investments $ 6,914 $ 2,765 $ 1,823 We amortize our LIHTC investments over the period that we expect to receive the tax benefits. During the first nine months of 2021, we recognized $147 million of amortization and $139 million of tax credits associated with these investments within “income taxes” on our income statement. During the first nine months of 2020, we recognized $137 million of amortization and $135 million of tax credits 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 $48 million and $53 million at September 30, 2021, and December 31, 2020, respectively. These investments are recorded in “other investments” on our balance sheet. 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, 2021, and December 31, 2020. Unconsolidated VIEs Dollars in millions Total Assets Total Liabilities Maximum Exposure to Loss September 30, 2021 Indirect investments $ 10,199 $ 189 $ 61 December 31, 2020 Indirect investments $ 10,899 $ 168 $ 78 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, 2021, and December 31, 2020, that can be used to settle the entities’ obligations. The entities had no liabilities at September 30, 2021, and December 31, 2020, and other equity investors have no recourse to our general credit. Additional information on our indirect and direct principal investments is provided in Note 5 (“Fair Value Measurements”) and in Note 13 (“Variable Interest Entities “) beginning on page 156 of our 2020 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, 2021, and December 31, 2020. 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 balance sheet. Of the total balance as of September 30, 2021, $2.8 billion 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 1 of our 2020 Form 10-K. Other unconsolidated VIEs Dollars in millions Total Assets Total Liabilities September 30, 2021 Other unconsolidated VIEs $ 3,166 $ 1 December 31, 2020 Other unconsolidated VIEs $ 351 $ 1

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2021
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 20.4% for the third quarter of 2021 and 12.5% for the third quarter of 2020. The effective tax rates are less than our combined federal and state statutory tax rate of 23.7%, primarily due to income from investments in tax-advantaged assets such as corporate-owned life insurance and credits associated with renewable energy and low-income housing investments. Deferred Taxes At September 30, 2021, we had a net deferred tax asset of $41 million, compared to a net deferred tax liability of $100 million at December 31, 2020, which are included in “accrued income and other assets” and “accrued expense and other liabilities,” respectively, on the balance sheet. 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 $12 million at September 30, 2021, and no valuation allowance at December 31, 2020. The valuation allowance is associated with federal and state capital loss carryforwards. Unrecognized Tax Benefits At September 30, 2021, Key’s unrecognized tax benefits were $55 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.

Acquisitions and Discontinued O

Acquisitions and Discontinued Operations	9 Months Ended
	Sep. 30, 2021
Business Combination and Asset Acquisition [Abstract]
Acquisitions and Discontinued Operations	13. Acquisition and Discontinued Operations Acquisitions Arbitria Quum Notitia, LLC (AQN Strategies). On February 25, 2021, KeyCorp acquired AQN Strategies, a diversified consulting practice, specializing in analytically driven strategies and solutions as it relates to bank transformations, credit and growth, and payments intelligence. The acquisition of AQN Strategies will advance Key’s analytics by adding senior talent and expertise directly aligned to Key’s focus areas. The acquisition was accounted for as a business combination. As a result, we recognized goodwill of $9 million. No other material assets were acquired or liabilities assumed as a result of the acquisition. Discontinued operations Discontinued operations primarily includes our government-guaranteed and private education lending business. At September 30, 2021, and December 31, 2020, approximately $602 million and $710 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, 2021
Banking and Thrift, Other Disclosures [Abstract]
Securities Financing Activities	14. Securities Financing Activities We enter into repurchase agreements to finance overnight customer sweep deposits. We also enter into repurchase and reverse repurchase agreements to settle other securities obligations. We account for these securities financing agreements as collateralized financing transactions. Repurchase and reverse repurchase agreements are recorded on the balance sheet at the amounts for which the securities will be subsequently sold or repurchased. Securities borrowed transactions are recorded on the balance sheet at the amounts of cash collateral advanced. While our securities financing agreements incorporate a right of set off, the assets and liabilities are reported on a gross basis. Reverse repurchase agreements and securities borrowed transactions are included in “short-term investments” on the Consolidated Balance Sheets; repurchase agreements are included in “federal funds purchased and securities sold under repurchase agreements.” Additional information regarding our securities financing activities, including risk management activities, is provided in Note 16 (“Securities Financing Activities”) beginning on page 160 of our 2020 Form 10-K. The following table summarizes our securities financing agreements at September 30, 2021, and December 31, 2020: September 30, 2021 December 31, 2020 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 $ 11 $ (11) — — $ 6 $ (6) — — Securities borrowed $ 500 $ — $ (500) — $ 500 $ — $ (500) — Total $ 511 $ (11) $ (500) — $ 506 $ (6) $ (500) — Offsetting of financial liabilities: Repurchase agreements (c) $ 229 $ (11) $ (218) — $ 220 $ (6) $ (214) — Total $ 229 $ (11) $ (218) — $ 220 $ (6) $ (214) — (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 mortgaged-backed agency securities and are contracted on an overnight or continuous basis. As of September 30, 2021, the carrying amount of assets pledged as collateral against repurchase agreements totaled $283 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, 2021, the liabilities associated with collateral pledged were solely comprised of customer sweep financing activity and had a carrying value of $218 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, 2021
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 164 of our 2020 Form 10-K. Three months ended September 30, Nine months ended September 30, Dollars in millions 2021 2020 2021 2020 Interest cost on PBO $ 6 $ 9 $ 18 $ 26 Expected return on plan assets (7) (10) (21) (29) Amortization of losses 5 5 14 13 Settlement loss 7 — 7 8 Net pension cost $ 11 $ 4 $ 18 $ 18

Trust Preferred Securities Issu

Trust Preferred Securities Issued by Unconsolidated Subsidiaries	9 Months Ended
	Sep. 30, 2021
Banking and Thrift, Other Disclosures [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, discussed in “Supervision and regulation” in Item 2 of this report, 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, 2021 KeyCorp Capital I $ 156 $ 6 $ 162 0.885 % 2028 KeyCorp Capital II 101 4 105 6.875 2029 KeyCorp Capital III 140 4 144 7.750 2029 HNC Statutory Trust III 20 1 21 1.531 2035 Willow Grove Statutory Trust I 20 1 21 1.409 2036 HNC Statutory Trust IV 17 1 18 1.426 2037 Westbank Capital Trust II 8 — 8 2.312 2034 Westbank Capital Trust III 8 — 8 2.312 2034 Total $ 470 $ 17 $ 486 4.343 % — December 31, 2020 $ 483 $ 17 $ 500 4.464 % — (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 $56 million at September 30, 2021, and $70 million at December 31, 2020. 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. The principal amount of certain debentures includes basis adjustments related to fair value hedges totaling $56 million at September 30, 2021, and $70 million at December 31, 2020. See Note 7 (“Derivatives and Hedging Activities”) for an explanation of fair value hedges. The principal amount of debentures, net of discounts, is included in “long-term debt” on the balance sheet. (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 have a floating interest rate, equal to three-month LIBOR plus 74 basis points, that reprices quarterly. The trust preferred securities issued by HNC Statutory Trust III have a floating interest rate, equal to three-month LIBOR plus 140 basis points, that reprices quarterly. The trust preferred securities issued by Willow Grove Statutory Trust I have a floating interest rate, equal to three-month LIBOR plus 131 basis points, that reprices quarterly. The trust preferred securities issued by HNC Statutory Trust IV have a floating interest rate, equal to three-month LIBOR plus 128 basis points, that reprices quarterly. The trust preferred securities issued by Westbank Capital Trust II and Westbank Capital Trust III each have a floating interest rate, equal to three-month LIBOR plus 219 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, 2021
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. 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, 2021. 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 116 of our 2020 Form 10-K. September 30, 2021 Maximum Potential Undiscounted Future Payments Liability Recorded Dollars in millions Financial guarantees: Standby letters of credit $ 3,463 $ 83 Recourse agreement with FNMA 6,272 25 Residential mortgage reserve 2,972 14 Written put options (a) 3,835 57 Total $ 16,542 $ 179 (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, 2021, 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 174 of our 2020 Form 10-K. Standby letters of credit. At September 30, 2021, our standby letters of credit had a remaining weighted-average life of 1.7 years, with remaining actual lives ranging from less than 1 year to as many as 13.2 years. Recourse agreement with FNMA. At September 30, 2021, the outstanding commercial mortgage loans in this program had a weighted-average remaining term of 7.7 years, and the unpaid principal balance outstanding of loans sold by us as a participant was $20.6 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 30.5% of the principal balance of loans outstanding at September 30, 2021. 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 in an amount that we believe approximates the fair value of our liability in addition to the expected credit loss for the guarantee as described in Note 4 (“Asset Quality“). Residential Mortgage Banking. At September 30, 2021, the unpaid principal balance outstanding of loans sold by us in this program was $9.7 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 30% of the principal balance of loans outstanding at September 30, 2021. Our liability for estimated repurchase obligations on loans sold, which is included in Other liabilities on the Consolidated Balance Sheets, was $14 million at September 30, 2021. For more information on our residential mortgages, see Note 8 (“Mortgage Servicing Assets“). Written put options. At September 30, 2021, our written put options had an average life of 2.1 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 175 of our 2020 Form 10-K.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	9 Months Ended
	Sep. 30, 2021
Equity [Abstract]
Accumulated Other Comprehensive Income	18. Accumulated Other Comprehensive Income Our changes in AOCI for the three and nine months ended September 30, 2021, and September 30, 2020, 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, 2020 $ 567 $ 476 $ (305) $ 738 Other comprehensive income before reclassification, net of income taxes (617) 11 (2) (608) Amounts reclassified from AOCI, net of income taxes (a) — (191) 16 (175) Net current-period other comprehensive income, net of income taxes (617) (180) 14 (783) Balance at September 30, 2021 $ (50) $ 296 $ (291) $ (45) Balance at June 30, 2021 $ 124 $ 325 $ (299) $ 150 Other comprehensive income before reclassification, net of income taxes (174) 30 (1) (145) Amounts reclassified from AOCI, net of income taxes (a) — (59) 9 (50) Net current-period other comprehensive income, net of income taxes (174) (29) 8 (195) Balance at September 30, 2021 $ (50) $ 296 $ (291) $ (45) Balance at December 31, 2019 $ 115 $ 250 $ (339) $ 26 Other comprehensive income before reclassification, net of income taxes 530 467 (1) 996 Amounts reclassified from AOCI, net of income taxes (a) (3) (168) 16 (155) Net current-period other comprehensive income, net of income taxes 527 299 15 841 Balance at September 30, 2020 $ 642 $ 549 $ (324) $ 867 Balance at June 30, 2020 $ 650 $ 613 $ (327) $ 936 Other comprehensive income before reclassification, net of income taxes (8) 11 (1) 2 Amounts reclassified from AOCI, net of income taxes (a) — (75) 4 (71) Net current-period other comprehensive income, net of income taxes (8) (64) 3 (69) Balance at September 30, 2020 $ 642 $ 549 $ (324) $ 867 (a) See table below for details about these reclassifications. Our reclassifications out of AOCI for the three and nine months ended September 30, 2021, and September 30, 2020, are as follows: Three months ended September 30, Affected Line Item in the Statement Where Net Income is Presented Dollars in millions 2021 2020 Unrealized gains (losses) on derivative financial instruments Interest rate $ 79 $ 100 Interest income — Loans Interest rate (1) (1) Interest expense — Long-term debt Interest rate (1) — Investment banking and debt placement fees 77 99 Income (loss) from continuing operations before income taxes 18 24 Income taxes $ 59 $ 75 Income (loss) from continuing operations Net pension and postretirement benefit costs Amortization of losses $ (5) $ (5) Other expense Settlement loss (7) — Other expense (12) (5) Income (loss) from continuing operations before income taxes (3) (1) Income taxes $ (9) $ (4) Income (loss) from continuing operations Nine months ended September 30, Affected Line Item in the Statement Where Net Income is Presented Dollars in millions 2021 2020 Unrealized gains (losses) on available for sale securities Realized gains — $ 4 Other income — 4 Income (loss) from continuing operations before income taxes — 1 Income taxes — $ 3 Income (loss) from continuing operations Unrealized gains (losses) on derivative financial instruments Interest rate $ 253 $ 224 Interest income — Loans Interest rate (3) (3) Interest expense — Long-term debt Interest rate — — Investment banking and debt placement fees 250 221 Income (loss) from continuing operations before income taxes 59 53 Income taxes $ 191 $ 168 Income (loss) from continuing operations Net pension and postretirement benefit costs Amortization of losses $ (14) $ (13) Other expense Settlement loss (7) (8) Other expense (21) (21) Income (loss) from continuing operations before income taxes (5) (5) Income taxes $ (16) $ (16) Income (loss) from continuing operations

Shareholders' Equity

Shareholders' Equity	9 Months Ended
	Sep. 30, 2021
Equity [Abstract]
Shareholders' Equity	19. Shareholders' Equity Comprehensive Capital Plan In the third quarter of 2021, under our current authorization pursuant to our 2021 capital plan, we completed $593 million of Common Share repurchases. Of the $593 million total common shares repurchased in the third quarter of 2021, $468 million were related to the initial settlement of an ASR program entered into with Goldman Sachs & Co. LLC (Goldman Sachs) on September 10, 2021, and $125 million were purchased in the open market. Less than $1 million of Common Share repurchases related to employee equity compensation programs. Under the ASR program, we made a cash payment of $585 million to Goldman Sachs and received an initial delivery of 23.6 million shares of our common stock from Goldman Sachs based on the then current market price of $19.87 of our common stock. The payment to Goldman Sachs was recorded as a reduction to our shareholders’ equity, consisting of a $468 million impact to treasury stock, which reflected the value of the initial 23.6 million shares received upon initial settlement, and a $117 million reduction to our capital surplus balance, which reflects the value of common stock held back by Goldman Sachs pending final settlement of the ASR program. The total number of shares that we will repurchase under the ASR program will be based on the volume-weighted average share price of our common stock during the term of the ASR agreement, less a discount, and subject to potential adjustments pursuant to the terms and conditions of the ASR agreement. Consistent with our capital plan, the Board declared a quarterly dividend of $.185 per Common Share for the third quarter of 2021. Common Share repurchases and Common Share dividends paid during the third quarter are consistent with the Federal Reserve’s third quarter capital distribution limitations. Preferred Stock Preferred stock series Amount outstanding (in millions) Shares authorized and outstanding Par value Liquidation preference Ownership interest per depositary share Liquidation preference per depositary share Third quarter 2021 dividends paid per depositary share Fixed-to-Floating Rate Perpetual Noncumulative Series D $ 525 21,000 $ 1 $ 25,000 1/25th $ 1,000 $ 12.50 Fixed-to-Floating Rate Perpetual Noncumulative Series E 500 500,000 1 1,000 1/40th 25 .382813 Fixed Rate Perpetual Noncumulative Series F 425 425,000 1 1,000 1/40th 25 .353125 Fixed Rate Perpetual Non-Cumulative Series G 450 450,000 1 1,000 1/40th 25 .351563

Business Segment Reporting

Business Segment Reporting	9 Months Ended
	Sep. 30, 2021
Segment Reporting [Abstract]
Business Segment Reporting	20. Business Segment Reporting 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, student loan refinancing, mortgage and home equity, credit card, treasury services, and business advisory services. In addition, wealth management and investment services are offered to assist non-profit, and high-net-worth clients with their banking, trust, portfolio management, life insurance, 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 needs of middle market clients in seven industry sectors: consumer, energy, healthcare, industrial, public sector, real estate, and technology. The Commercial operating segment is also a significant servicer of commercial mortgage loans and a significant special servicer of CMBS. The Institutional operating segment delivers a broad suite of banking and capital markets products to its clients, including syndicated finance, debt and equity capital markets, commercial payments, equipment finance, commercial mortgage banking, derivatives, foreign exchange, financial 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 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 include intercompany eliminations and certain items that are not allocated to the business segments because they do not reflect their normal operations. 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. The table below shows selected financial data for our business segments for the three- and nine-month periods ended September 30, 2021, and September 30, 2020. 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 2021 2020 2021 2020 2021 2020 2021 2020 SUMMARY OF OPERATIONS Net interest income (TE) $ 582 $ 598 $ 414 $ 427 $ 29 $ (19) $ 1,025 $ 1,006 Noninterest income 288 266 477 384 32 31 797 681 Total revenue (TE) (a) 870 864 891 811 61 12 1,822 1,687 Provision for credit losses (38) (3) (69) 150 — 13 (107) 160 Depreciation and amortization expense 31 19 34 35 22 35 87 89 Other noninterest expense 560 548 436 412 29 (12) 1,025 948 Income (loss) from continuing operations before income taxes (TE) 317 300 490 214 10 (24) 817 490 Allocated income taxes and TE adjustments 76 71 106 41 (8) (46) 174 66 Income (loss) from continuing operations 241 229 384 173 18 22 643 424 Income (loss) from discontinued operations, net of taxes — — — — 2 4 2 4 Net income (loss) 241 229 384 173 20 26 645 428 Less: Net income (loss) attributable to noncontrolling interests — — — — — — — — Net income (loss) attributable to Key $ 241 $ 229 $ 384 $ 173 $ 20 $ 26 $ 645 $ 428 AVERAGE BALANCES (b) Loans and leases $ 39,796 $ 38,354 $ 59,914 $ 66,378 $ 428 $ 187 $ 100,138 $ 104,919 Total assets (a) 42,981 43,304 69,285 74,530 69,105 50,977 181,371 168,811 Deposits 89,156 82,829 56,546 51,585 1,214 530 146,916 134,944 OTHER FINANCIAL DATA Net loan charge-offs (b) $ 35 $ 23 $ (6) $ 103 $ — $ 2 $ 29 $ 128 Return on average allocated equity (b) 25.81 % 26.21 % 18.68 % 13.35 % 1.18 % .96 % 14.25 % 9.51 % Return on average allocated equity 25.81 26.21 18.68 13.35 1.31 1.14 14.30 9.60 Average full-time equivalent employees (c) 7,976 8,323 2,371 2,312 6,662 6,462 17,009 17,097 (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 2021 2020 2021 2020 2021 2020 2021 2020 SUMMARY OF OPERATIONS Net interest income (TE) $ 1,788 $ 1,765 $ 1,244 $ 1,305 $ 28 $ (50) $ 3,060 $ 3,020 Noninterest income 798 740 1,377 1,023 110 87 2,285 1,850 Total revenue (TE) (a) 2,586 2,505 2,621 2,328 138 37 5,345 4,870 Provision for credit losses (132) 289 (267) 697 (23) 15 (422) 1,001 Depreciation and amortization expense 71 59 101 108 95 105 267 272 Other noninterest expense 1,706 1,597 1,263 1,144 23 (32) 2,992 2,709 Income (loss) from continuing operations before income taxes (TE) 941 560 1,524 379 43 (51) 2,508 888 Allocated income taxes and TE adjustments 226 133 324 38 (27) (37) 523 134 Income (loss) from continuing operations 715 427 1,200 341 70 (14) 1,985 754 Income (loss) from discontinued operations, net of taxes — — — — 11 7 11 7 Net income (loss) 715 427 1,200 341 81 (7) 1,996 761 Less: Net income (loss) attributable to noncontrolling interests — — — — — — — — Net income (loss) attributable to Key $ 715 $ 427 $ 1,200 $ 341 $ 81 (d) $ (7) $ 1,996 $ 761 AVERAGE BALANCES (b) Loans and leases $ 39,883 $ 36,319 $ 60,358 $ 66,374 $ 321 $ 325 $ 100,562 $ 103,018 Total assets (a) 43,094 40,644 69,607 75,205 64,493 43,897 177,194 159,746 Deposits 87,549 78,414 54,660 45,350 814 691 143,023 124,455 OTHER FINANCIAL DATA Net loan charge-offs (b) $ 105 $ 106 $ 81 $ 200 (21) 2 $ 165 $ 308 Return on average allocated equity (b) 26.70 % 16.66 % 18.92 % 9.19 % 1.62 % (.20) % 14.87 % 5.74 % Return on average allocated equity 26.70 16.66 18.92 9.19 1.87 (.10) 14.96 5.79 Average full-time equivalent employees (c) 8,062 8,171 2,371 2,288 6,601 6,299 17,034 16,758 (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, 2021
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, 2021, and September 30, 2020. 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, 2021 Three months ended September 30, 2020 Dollars in millions Consumer Bank Commercial Bank Total Contract Revenue Consumer Bank Commercial Bank Total Contract Revenue NONINTEREST INCOME Trust and investment services income $ 105 $ 16 $ 121 $ 100 $ 15 $ 115 Investment banking and debt placement fees — 169 169 — 69 69 Services charges on deposit accounts 56 35 91 45 32 77 Cards and payments income 46 61 107 43 69 112 Other noninterest income 2 — 2 3 — 3 Total revenue from contracts with customers $ 209 $ 281 $ 490 $ 191 $ 185 $ 376 Other noninterest income (a) $ 275 $ 274 Noninterest income from Other (b) 32 31 Total noninterest income $ 797 $ 681 (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, 2021 Nine months ended September 30, 2020 Dollars in millions Consumer Bank Commercial Bank Total Contract Revenue Consumer Bank Commercial Bank Total Contract Revenue NONINTEREST INCOME Trust and investment services income $ 311 $ 49 $ 360 $ 279 $ 49 $ 328 Investment banking and debt placement fees — 367 367 — 176 176 Services charges on deposit accounts 145 102 247 138 91 229 Cards and payments income 135 187 322 118 147 265 Other noninterest income 5 2 7 7 — 7 Total revenue from contracts with customers $ 596 $ 707 $ 1,303 $ 542 $ 463 $ 1,005 Other noninterest income (a) $ 872 $ 758 Noninterest income from Other (b) 110 87 Total noninterest income $ 2,285 $ 1,850 (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. We had no material contract assets or contract liabilities as of September 30, 2021, and September 30, 2020.

Basis of Presentation and Acc_2

Basis of Presentation and Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2021
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 to conform to current reporting practices. 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% 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 2020 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.
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets Effective January 1, 2021, Key changed its approach for allocating equity to its reporting units. The carrying amounts of Key’s reporting units now represent the combination of regulatory and economic equity for goodwill impairment testing and management reporting purposes. The fair values of each reporting unit are estimated using a combination of market and income approaches. For more information, refer to Note 10 (“Goodwill”).
Accounting Guidance Adopted in 2021	Accounting Guidance Adopted in 2021 Standard Required Adoption Description Effect on Financial Statements or ASU 2019-12, January 1, 2021 This ASU simplifies the accounting for income Along with general improvements, it adds The guidance should be applied on either a The adoption of this accounting guidance did not have a material effect on our financial condition or results of operations. ASU 2020-01, January 1, 2021 This guidance clarifies that when applying the It also clarifies that companies should not This guidance should be applied on prospective basis. The adoption of this accounting guidance did not have a material effect on our financial condition or results of operations. ASU 2020-08, Codification Improvements to Subtopic 310-20, Receivables—Nonrefundable Fees and Other Costs January 1, 2021 This ASU clarifies that at each reporting period an entity should reevaluate whether a callable debt security is within the scope of ASC 310, which says that to the extent the amortized cost basis of an individual callable debt security exceeds the amount repayable by the issuer at the earliest call date, the premium shall be amortized to the earliest call date, unless prepayment guidance is applied. This guidance should be applied on a prospective basis. The adoption of this accounting guidance did not have a material effect on our financial condition or results of operations. ASU 2021-01, Reference January 1, 2021 The ASU clarifies that certain optional expedients and exceptions related to contracts modified as a result of reference rate reform and hedge accounting apply to derivatives affected by the discounting transition, such as those that use an interest rate for margining, The guidance may be applied on a full retrospective basis as of any date from the beginning of an interim period that includes or is subsequent to March 12, 2020. Alternatively, it may be applied on a prospective basis to new modifications from any date within an interim period that includes or is subsequent to the date of the issuance of a final Update, until the financial statements are available to be issued. Key adopted this guidance on January 1, 2021, on a prospective basis and will assess the impact in conjunction with the reference rate transition.

Basis of Presentation and Acc_3

Basis of Presentation and Accounting Policies (Tables)	9 Months Ended
	Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of New Accounting Pronouncements and Changes in Accounting Principles	Standard Required Adoption Description Effect on Financial Statements or ASU 2019-12, January 1, 2021 This ASU simplifies the accounting for income Along with general improvements, it adds The guidance should be applied on either a The adoption of this accounting guidance did not have a material effect on our financial condition or results of operations. ASU 2020-01, January 1, 2021 This guidance clarifies that when applying the It also clarifies that companies should not This guidance should be applied on prospective basis. The adoption of this accounting guidance did not have a material effect on our financial condition or results of operations. ASU 2020-08, Codification Improvements to Subtopic 310-20, Receivables—Nonrefundable Fees and Other Costs January 1, 2021 This ASU clarifies that at each reporting period an entity should reevaluate whether a callable debt security is within the scope of ASC 310, which says that to the extent the amortized cost basis of an individual callable debt security exceeds the amount repayable by the issuer at the earliest call date, the premium shall be amortized to the earliest call date, unless prepayment guidance is applied. This guidance should be applied on a prospective basis. The adoption of this accounting guidance did not have a material effect on our financial condition or results of operations. ASU 2021-01, Reference January 1, 2021 The ASU clarifies that certain optional expedients and exceptions related to contracts modified as a result of reference rate reform and hedge accounting apply to derivatives affected by the discounting transition, such as those that use an interest rate for margining, The guidance may be applied on a full retrospective basis as of any date from the beginning of an interim period that includes or is subsequent to March 12, 2020. Alternatively, it may be applied on a prospective basis to new modifications from any date within an interim period that includes or is subsequent to the date of the issuance of a final Update, until the financial statements are available to be issued. Key adopted this guidance on January 1, 2021, on a prospective basis and will assess the impact in conjunction with the reference rate transition.

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
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 2021 2020 2021 2020 EARNINGS Income (loss) from continuing operations $ 643 $ 424 $ 1,985 $ 754 Less: Net income (loss) attributable to noncontrolling interests — — — — Income (loss) from continuing operations attributable to Key 643 424 1,985 754 Less: Dividends on Preferred Stock 27 27 80 80 Income (loss) from continuing operations attributable to Key common shareholders 616 397 1,905 674 Income (loss) from discontinued operations, net of taxes 2 4 11 7 Net income (loss) attributable to Key common shareholders $ 618 $ 401 $ 1,916 $ 681 WEIGHTED-AVERAGE COMMON SHARES Weighted-average Common Shares outstanding (000) 942,446 967,804 955,069 967,632 Effect of Common Share options and other stock awards 10,077 6,184 9,712 6,648 Weighted-average Common Shares and potential Common Shares outstanding (000) (a) 952,523 973,988 964,781 974,280 EARNINGS PER COMMON SHARE Income (loss) from continuing operations attributable to Key common shareholders $ .65 $ .41 $ 1.99 $ .70 Income (loss) from discontinued operations, net of taxes — — .01 .01 Net income (loss) attributable to Key common shareholders (b) .66 .41 2.00 .70 Income (loss) from continuing operations attributable to Key common shareholders — assuming dilution $ .65 $ .41 $ 1.98 $ .69 Income (loss) from discontinued operations, net of taxes — assuming dilution — — .01 .01 Net income (loss) attributable to Key common shareholders — assuming dilution (b) .65 .41 1.99 .70 (a) Assumes conversion of Common Share options and other stock awards and/or convertible preferred stock, as applicable. (b) EPS may not foot due to rounding.

Loan Portfolio (Tables)

Loan Portfolio (Tables)	9 Months Ended
	Sep. 30, 2021
Loans Receivables [Abstract]
Loans by Category	Dollars in millions September 30, 2021 December 31, 2020 Commercial and industrial (b) $ 49,553 $ 52,907 Commercial real estate: Commercial mortgage 13,674 12,687 Construction 2,120 1,987 Total commercial real estate loans 15,794 14,674 Commercial lease financing (c) 3,982 4,399 Total commercial loans 69,329 71,980 Residential — prime loans: Real estate — residential mortgage 14,204 9,298 Home equity loans 8,747 9,360 Total residential — prime loans 22,951 18,658 Consumer direct loans 5,324 4,714 Credit cards 928 989 Consumer indirect loans 77 4,844 Total consumer loans 29,280 29,205 Total loans (d) $ 98,609 $ 101,185 (a) Accrued interest of $211 million and $241 million at September 30, 2021, and December 31, 2020, respectively, presented in "other assets" on the Consolidated Balance Sheets is excluded from the amortized cost basis disclosed in this table. (b) Loan balances include $139 million and $127 million of commercial credit card balances at September 30, 2021, and December 31, 2020, respectively. (c) Commercial lease financing includes receivables held as collateral for a secured borrowing of $16 million and $23 million at September 30, 2021, and December 31, 2020, respectively. Principal reductions are based on the cash payments received from these related receivables. Additional information pertaining to this secured borrowing is included in Note 20 (“Long-Term Debt”) beginning on page 171 of our 2020 Form 10-K.

Asset Quality (Tables)

Asset Quality (Tables)	9 Months Ended
	Sep. 30, 2021
Credit Loss [Abstract]
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, 2021: Dollars in millions June 30, 2021 Provision Charge-offs Recoveries September 30, 2021 Commercial and Industrial $ 499 $ (30) $ (27) $ 20 $ 462 Commercial real estate: Real estate — commercial mortgage 227 (44) — 1 184 Real estate — construction 35 (8) — — 27 Total commercial real estate loans 262 (52) — 1 211 Commercial lease financing 34 (7) (1) 6 32 Total commercial loans 795 (89) (28) 27 705 Real estate — residential mortgage 86 (1) 2 1 88 Home equity loans 136 (13) (1) 2 124 Consumer direct loans 115 (5) (7) 2 105 Credit cards 68 (4) (6) 1 59 Consumer indirect loans 20 5 (26) 4 3 Total consumer loans 425 (18) (38) 10 379 Total ALLL — continuing operations 1,220 (107) (66) 37 1,084 Discontinued operations 30 (1) (1) 1 29 Total ALLL — including discontinued operations $ 1,250 $ (108) $ (67) $ 38 $ 1,113 Three months ended September 30, 2020: Dollars in millions June 30, 2020 Provision Charge-offs Recoveries September 30, 2020 Commercial and Industrial $ 725 $ 177 $ (101) $ 9 $ 810 Commercial real estate: Real estate — commercial mortgage 292 (2) (13) 2 279 Real estate — construction 41 (7) — — 34 Total commercial real estate loans 333 (9) (13) 2 313 Commercial lease financing 55 13 (10) — 58 Total commercial loans 1,113 181 (124) 11 1,181 Real estate — residential mortgage 101 2 — 1 104 Home equity loans 197 (13) (4) 3 183 Consumer direct loans 130 1 (8) 2 125 Credit cards 107 (5) (9) 2 95 Consumer indirect loans 60 (16) (6) 4 42 Total consumer loans 595 (31) (27) 12 549 Total ALLL — continuing operations 1,708 150 (a) (151) 23 1,730 Discontinued operations 43 (1) — — 42 Total ALLL — including discontinued operations $ 1,751 $ 149 $ (151) $ 23 $ 1,772 (a) Excludes a provision for losses on lending-related commitments of $10 million. Nine months ended September 30, 2021 Dollars in millions December 31, 2020 Provision Charge-offs Recoveries September 30, 2021 Commercial and Industrial $ 678 $ (135) $ (141) $ 60 $ 462 Commercial real estate: Real estate — commercial mortgage 327 (112) (39) 8 184 Real estate — construction 47 (20) — — 27 Total commercial real estate loans 374 (132) — — 211 Commercial lease financing 47 (17) (5) 7 32 Total commercial loans 1,099 (284) (185) 75 705 Real estate — residential mortgage 102 (17) 1 2 88 Home equity loans 171 (44) (7) 4 124 Consumer direct loans 128 (7) (22) 6 105 Credit cards 87 (13) (21) 6 59 Consumer indirect loans 39 (12) (38) 14 3 Total consumer loans 527 (93) (87) 32 379 Total ALLL — continuing operations 1,626 (377) (a) (272) 107 1,084 Discontinued operations 36 (6) (3) 2 29 Total ALLL — including discontinued operations $ 1,662 $ (383) $ (275) $ 109 $ 1,113 (a) Excludes a credit for losses on lending-related comm itments of $45 million Nine months ended September 30, 2020 Dollars in millions December 31, 2019 Impact of ASC 326 Adoption January 1, 2020 Provision Charge-offs Recoveries September 30, 2020 Commercial and Industrial $ 551 $ (141) $ 410 $ 613 $ (232) $ 19 $ 810 Commercial real estate: Real estate — commercial mortgage 143 16 159 135 (18) 3 279 Real estate — construction 22 (7) 15 19 — — 34 Total commercial real estate loans 165 9 174 154 (18) 3 313 Commercial lease financing 35 8 43 30 (16) 1 58 Total commercial loans 751 (124) 627 797 (266) 23 1,181 Real estate — residential mortgage 7 77 84 21 (2) 1 104 Home equity loans 31 147 178 9 (10) 6 183 Consumer direct loans 34 63 97 52 (30) 6 125 Credit cards 47 35 82 39 (32) 6 95 Consumer indirect loans 30 6 36 16 (22) 12 42 Total consumer loans 149 328 477 137 (96) 31 549 Total ALLL — continuing operations 900 204 1,104 934 (a) (362) 54 1,730 Discontinued operations 10 31 41 2 (4) 3 42 Total ALLL — including discontinued operations $ 910 $ 235 $ 1,145 $ 936 $ (366) $ 57 $ 1,772 (a) Excludes a provision for losses on lending-related commitments of $67 million.
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), GDP, industrial production, and unemployment rate Commercial real estate BBB corporate bond rate (spread), property and real estate price indices, and unemployment rate 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 Consumer direct Unemployment rate and U.S. household income Consumer indirect New vehicle sales, used vehicle prices, and unemployment rate 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.
Financing Receivable Credit Quality Indicators	Credit Risk Profile by Creditworthiness Category and Vintage (a) As of September 30, 2021 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 2021 2020 2019 2018 2017 Prior Total Commercial and Industrial Risk Rating: Pass $ 9,315 $ 5,420 $ 4,491 $ 3,186 $ 2,016 $ 3,884 $ 18,950 $ 102 $ 47,364 Criticized (Accruing) 40 115 193 192 236 208 925 27 1,936 Criticized (Nonaccruing) — 9 18 41 6 16 160 3 253 Total commercial and industrial 9,355 5,544 4,702 3,419 2,258 4,108 20,035 132 49,553 Real estate — commercial mortgage Risk Rating: Pass 3,219 1,357 2,589 1,338 687 3,073 690 64 13,017 Criticized (Accruing) 15 20 87 85 123 228 48 2 608 Criticized (Nonaccruing) — 1 1 5 1 37 4 — 49 Total real estate — commercial mortgage 3,234 1,378 2,677 1,428 811 3,338 742 66 13,674 Real estate — construction Risk Rating: Pass 318 619 610 292 104 49 29 6 2,027 Criticized (Accruing) — 4 13 52 22 1 1 — 93 Criticized (Nonaccruing) — — — — — — — — — Total real estate — construction 318 623 623 344 126 50 30 6 2,120 Commercial lease financing Risk Rating: Pass 655 815 744 348 347 997 — — 3,906 Criticized (Accruing) — 4 35 14 13 5 — — 71 Criticized (Nonaccruing) — — 1 1 1 2 — — 5 Total commercial lease financing 655 819 780 363 361 1,004 — 3,982 Total commercial loans $ 13,562 $ 8,364 $ 8,782 $ 5,554 $ 3,556 $ 8,500 $ 20,807 $ 204 $ 69,329 As of December 31, 2020 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 2020 2019 2018 2017 2016 Prior Total Commercial and Industrial Risk Rating: Pass $ 13,100 $ 5,487 $ 4,040 $ 2,617 $ 1,967 $ 2,709 $ 19,832 $ 118 $ 49,870 Criticized (Accruing) 66 198 174 236 150 279 1,527 22 2,652 Criticized (Nonaccruing) 8 27 71 28 17 7 226 1 385 Total commercial and industrial 13,174 5,712 4,285 2,881 2,134 2,995 21,585 141 52,907 Real estate — commercial mortgage Risk Rating: Pass 1,591 2,937 1,737 867 765 3,027 885 43 11,852 Criticized (Accruing) 12 142 81 145 72 255 22 2 731 Criticized (Nonaccruing) — 1 4 4 2 88 5 — 104 Total real estate — commercial mortgage 1,603 3,080 1,822 1,016 839 3,370 912 45 12,687 Real estate — construction Risk Rating: Pass 367 764 510 188 27 22 31 5 1,914 Criticized (Accruing) — 14 38 18 — 2 1 — 73 Criticized (Nonaccruing) — — — — — — — — — Total real estate — construction 367 778 548 206 27 24 32 5 1,987 Commercial lease financing Risk Rating: Pass 1,076 1,050 534 504 228 901 — — 4,293 Criticized (Accruing) 10 35 15 26 7 4 — — 97 Criticized (Nonaccruing) — 2 2 2 2 1 — — 9 Total commercial lease financing 1,086 1,087 551 532 237 906 — — 4,399 Total commercial loans $ 16,230 $ 10,657 $ 7,206 $ 4,635 $ 3,237 $ 7,295 $ 22,529 $ 191 $ 71,980 (a) Accrued intere st of $117 million a nd $140 million as of September 30, 2021 and December 31, 2020, respectively, presented in Other Assets on the Consolidated Balance Sheets, was excluded from the amortized cost basis disclosed in these tables. Consumer Credit Exposure Credit Risk Profile by FICO Score and Vintage (a) As of September 30, 2021 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 2021 2020 2019 2018 2017 Prior Total Real estate — residential mortgage FICO Score: 750 and above $ 6,071 $ 3,150 $ 933 $ 104 $ 141 $ 1,218 — — $ 11,617 660 to 749 1,300 407 186 47 31 323 — — 2,294 Less than 660 23 12 19 16 10 151 — — 231 No Score 19 1 1 2 4 34 1 — 62 Total real estate — residential mortgage 7,413 3,570 1,139 169 186 1,726 1 — 14,204 Home equity loans FICO Score: 750 and above 919 885 285 113 139 739 $ 2,333 $ 462 5,875 660 to 749 345 295 130 49 47 222 1,037 158 2,283 Less than 660 20 26 20 14 15 99 336 48 578 No Score — 2 — 1 — 2 5 1 11 Total home equity loans 1,284 1,208 435 177 201 1,062 3,711 669 8,747 Consumer direct loans FICO Score: 750 and above 1,287 1,271 594 76 20 137 109 — 3,494 660 to 749 413 350 200 51 13 48 217 — 1,292 Less than 660 19 22 29 12 3 14 61 — 160 No Score 47 45 32 16 9 21 208 — 378 Total consumer direct loans 1,766 1,688 855 155 45 220 595 — 5,324 Credit cards FICO Score: 750 and above — — — — — — 472 — 472 660 to 749 — — — — — — 375 — 375 Less than 660 — — — — — — 72 — 72 No Score — — — — — — 9 — 9 Total credit cards — — — — — — 928 — 928 Consumer indirect loans FICO Score: 750 and above 4 — — — — 36 — — 40 660 to 749 — — — — — 26 — — 26 Less than 660 — — — — — 11 — — 11 No Score — — — — — — — — — Total consumer indirect loans 4 — — — — 73 — — 77 Total consumer loans $ 10,467 $ 6,466 $ 2,429 $ 501 $ 432 $ 3,081 $ 5,235 $ 669 $ 29,280 As of December 31, 2020 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 2020 2019 2018 2017 2016 Prior Total Real estate — residential mortgage FICO Score: 750 and above $ 3,595 $ 1,620 $ 194 $ 254 $ 537 $ 1,211 — — $ 7,411 660 to 749 710 284 76 48 100 332 — — 1,550 Less than 660 16 28 21 10 26 170 — — 271 No Score 1 2 2 7 2 52 — — 66 Total real estate — residential mortgage 4,322 1,934 293 319 665 1,765 — — 9,298 Home equity loans FICO Score: 750 and above 1,043 404 168 202 190 839 $ 2,689 $ 590 6,125 660 to 749 385 198 82 77 69 253 1,237 206 2,507 Less than 660 27 30 18 20 20 113 426 61 715 No Score 2 2 1 — — 2 5 1 13 Total home equity loans 1,457 634 269 299 279 1,207 4,357 858 9,360 Consumer direct loans FICO Score: 750 and above 1,840 883 115 32 16 57 119 — 3,062 660 to 749 479 268 80 22 14 33 254 1 1,151 Less than 660 23 37 21 8 5 10 81 — 185 No Score 65 35 21 21 10 11 153 — 316 Total consumer direct loans 2,407 1,223 237 83 45 111 607 1 4,714 Credit cards FICO Score: 750 and above — — — — — — 488 — 488 660 to 749 — — — — — — 407 — 407 Less than 660 — — — — — — 93 — 93 No Score — — — — — — 1 — 1 Total credit cards — — — — — — 989 — 989 Consumer indirect loans FICO Score: 750 and above 1,092 924 369 188 69 66 — — 2,708 660 to 749 653 558 232 97 36 47 — — 1,623 Less than 660 143 163 99 54 25 28 — — 512 No Score 1 — — — — — — — 1 Total consumer indirect loans 1,889 1,645 700 339 130 141 — — 4,844 Total consumer loans $ 10,075 $ 5,436 $ 1,499 $ 1,040 $ 1,119 $ 3,224 $ 5,953 $ 859 $ 29,205 (a) Accrued intere st of $95 million and $101 million as of September 30, 2021 and December 31, 2020, respectively, presented in Other Assets on the Consolidated Balance Sheets, was excluded from the amortized cost basis disclosed in this table.
Past Due Loans Including Current Loans	The following aging analysis of past due and current loans as of September 30, 2021, and December 31, 2020, provides further information regarding Key’s credit exposure. Aging Analysis of Loan Portfolio (a) September 30, 2021 Current 30-59 Days Past Due (b) 60-89 Days Past Due (b) 90 and Greater Days Past Due (b) Non-performing Total Past Total Loans (c) Dollars in millions LOAN TYPE Commercial and industrial $ 49,161 $ 56 $ 33 $ 50 $ 253 $ 392 $ 49,553 Commercial real estate: Commercial mortgage 13,606 12 2 5 49 68 13,674 Construction 2,118 1 — 1 — 2 2,120 Total commercial real estate loans 15,724 13 2 6 49 70 15,794 Commercial lease financing 3,973 2 1 1 5 9 3,982 Total commercial loans $ 68,858 $ 71 $ 36 $ 57 $ 307 $ 471 $ 69,329 Real estate — residential mortgage $ 14,096 $ 6 $ 3 $ 6 $ 93 $ 108 $ 14,204 Home equity loans 8,559 22 10 10 146 188 8,747 Consumer direct loans 5,307 6 3 4 4 17 5,324 Credit cards 914 3 3 5 3 14 928 Consumer indirect loans 75 1 — — 1 2 77 Total consumer loans $ 28,951 $ 38 $ 19 $ 25 $ 247 $ 329 $ 29,280 Total loans $ 97,809 $ 109 $ 55 $ 82 $ 554 $ 800 $ 98,609 (a) Amounts in table represent amortized cost and exclude loans held for sale. (b) Accrued inter est of $211 million p resented in 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. December 31, 2020 Current 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 Total Loans (c) Dollars in millions LOAN TYPE Commercial and industrial $ 52,396 $ 36 $ 50 $ 40 $ 385 $ 511 $ 52,907 Commercial real estate: Commercial mortgage 12,548 9 5 21 104 139 12,687 Construction 1,986 — — 1 — 1 1,987 Total commercial real estate loans 14,534 9 5 22 104 140 14,674 Commercial lease financing 4,369 21 1 — 8 30 4,399 Total commercial loans $ 71,299 $ 66 $ 56 $ 62 $ 497 $ 681 $ 71,980 Real estate — residential mortgage $ 9,173 $ 11 $ 3 $ 1 $ 110 $ 125 $ 9,298 Home equity loans 9,143 34 20 9 154 217 9,360 Consumer direct loans 4,694 7 4 4 5 20 4,714 Credit cards 972 5 3 7 2 17 989 Consumer indirect loans 4,792 25 7 3 17 52 4,844 Total consumer loans $ 28,774 $ 82 $ 37 $ 24 $ 288 $ 431 $ 29,205 Total loans $ 100,073 $ 148 $ 93 $ 86 $ 785 $ 1,112 $ 101,185 (a) Amounts in table represent amortized cost and exclude loans held for sale. (b) Accrued interest of $241 million presented in 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.
Post-Modification Outstanding Recorded Investment by Concession Type for Our Commercial Accruing and Nonaccruing TDRs	The following table shows the post-modification outstanding recorded investment by concession type for our commercial and consumer accruing and nonaccruing TDRs that occurred during the periods indicated: Three Months Ended September 30, Nine Months Ended September 30, Dollars in millions 2021 2020 2021 2020 Commercial loans: Extension of Maturity Date $ — $ — $ 5 $ 8 Payment or Covenant Modification/Deferment — — 7 — Bankruptcy Plan Modification — — — — Increase in new commitment or new money — — — — Total $ — $ — $ 12 $ 8 Consumer loans: Interest rate reduction $ 3 $ 13 $ 6 $ 22 Other 12 6 18 18 Total $ 15 $ 19 $ 24 $ 40 Total TDRs $ 15 $ 19 $ 36 $ 48
Summary Of Post-Modification Outstanding Recorded Investment, Accruing And Nonaccruing TDRs	The following table summarizes the change in the post-modification outstanding recorded investment of our accruing and nonaccruing TDRs during the periods indicated: Three Months Ended September 30, Nine Months Ended September 30, Dollars in millions 2021 2020 2021 2020 Balance at beginning of the period $ 334 $ 310 $ 363 $ 347 Additions 17 26 98 65 Payments (81) (22) (162) (75) Charge-offs — (8) (29) (31) Balance at end of period $ 270 $ 306 $ 270 $ 306
Breakdown of Nonperforming TDRs by Loans Category	A further breakdown of TDRs included in nonperforming loans by loan category for the periods indicated are as follows: September 30, 2021 December 31, 2020 Number of Loans Pre-modification Outstanding Recorded Investment Post-modification Outstanding Recorded Investment Number of Loans Pre-modification Outstanding Recorded Investment Post-modification Outstanding Recorded Investment Dollars in millions LOAN TYPE Nonperforming: Commercial and industrial 35 $ 92 $ 53 66 $ 136 $ 92 Commercial real estate: Commercial mortgage 3 50 29 7 62 50 Total commercial real estate loans 3 50 29 7 62 50 Total commercial loans 38 142 82 73 198 142 Real estate — residential mortgage 218 26 25 258 35 34 Home equity loans 569 38 33 630 41 37 Consumer direct loans 201 3 3 212 3 3 Credit cards 328 2 2 356 2 2 Consumer indirect loans 23 1 1 861 15 11 Total consumer loans 1,339 70 64 2,317 96 87 Total nonperforming TDRs 1,377 212 146 2,390 294 229 Prior-year accruing: (a) Commercial and industrial 7 49 26 3 5 — Commercial real estate Commercial mortgage 1 — — — — — Total commercial real estate loans 1 — — — — — Total commercial loans 8 49 26 3 5 — Real estate — residential mortgage 464 39 34 485 37 31 Home equity loans 1,648 100 78 1,781 106 83 Consumer direct loans 206 5 3 163 4 3 Credit cards 564 4 1 536 3 1 Consumer indirect loans 150 16 8 775 29 16 Total consumer loans 3,032 164 124 3,740 179 134 Total prior-year accruing TDRs 3,040 163 124 3,743 184 134 Total TDRs 4,417 $ 375 $ 270 6,133 $ 478 $ 363 (a) All TDRs that were restructured prior to January 1, 2021, and January 1, 2020, are fully accruing.
Changes in Liability for Credit Losses on Off-Balance Sheet Exposures	Changes in the liability for credit losses on off balance sheet exposures are summarized as follows: Three months ended September 30, Nine months ended September 30, Dollars in millions 2021 2020 2021 2020 Balance at the end of the prior period $ 152 $ 198 $ 197 $ 68 Liability for credit losses on contingent guarantees at the end of the prior period — — — 7 Cumulative effect from change in accounting principle (a), (b) — — — 66 Balance at beginning of period 152 198 197 141 Provision (credit) for losses on off balance sheet exposures — 10 (45) 67 Balance at end of period $ 152 $ 208 $ 152 $ 208 (a) The cumulative effect from change in accounting principle relates to the January 1, 2020, adoption of ASU 2016-13. (b) The nine months ended September 30, 2020, amount exclud es $4 million related to the provision for other financial assets.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2021
Fair Value Disclosures [Abstract]
Fair Value of Assets and Liabilities Measured on Recurring Basis	The following tables present these assets and liabilities at September 30, 2021, and December 31, 2020. September 30, 2021 December 31, 2020 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 — $ 747 — $ 747 — $ 633 — $ 633 States and political subdivisions — 91 — 91 — 24 — 24 Other mortgage-backed securities — 21 — 21 — 47 — 47 Other securities $ 17 13 — 30 — 13 — 13 Total trading account securities 17 872 — 889 — 717 — 717 Commercial loans — 13 — 13 — 18 — 18 Total trading account assets 17 885 — 902 — 735 — 735 Securities available for sale: U.S. Treasury, agencies and corporations — 8,938 — 8,938 — 1,000 — 1,000 States and political subdivisions — — — — — — — — Agency residential collateralized mortgage obligations — 16,104 — 16,104 — 14,273 — 14,273 Agency residential mortgage-backed securities — 5,408 — 5,408 — 2,164 — 2,164 Agency commercial mortgage-backed securities — 10,121 — 10,121 — 10,106 — 10,106 Other securities — 1 $ 22 23 — — $ 13 13 Total securities available for sale — 40,572 22 40,594 — 27,543 13 27,556 Other investments: Principal investments: Direct — — 1 1 — — 1 1 Indirect (measured at NAV) (a) — — — 48 — — — 53 Total principal investments — — 1 49 — — 1 54 Equity investments: Direct — — 9 9 — — 13 13 Direct (measured at NAV) (a) — — — 16 — — — 7 Indirect (measured at NAV) (a) — — — 6 — — — 7 Total equity investments — — 9 31 — — 13 27 Total other investments — — 10 80 — — 14 81 Loans, net of unearned income (residential) — — 10 10 — — 11 11 Loans held for sale (residential) — 237 — 237 — 264 — 264 Derivative assets: Interest rate — 920 34 954 — 1,528 56 1,584 Foreign exchange 65 15 — 80 $ 78 31 — 109 Commodity — 1,799 — 1,799 — 424 2 426 Credit — — — — — — 1 1 Other — 16 6 22 — 26 32 58 Derivative assets 65 2,750 40 2,855 78 2,009 91 2,178 Netting adjustments (b) — — — (302) — — — (380) Total derivative assets 65 2,750 40 2,553 78 2,009 91 1,798 Accrued income and other assets — — — — — — — — Total assets on a recurring basis at fair value $ 82 $ 44,444 $ 82 $ 44,376 $ 78 $ 30,551 $ 129 $ 30,445 LIABILITIES MEASURED ON A RECURRING BASIS Bank notes and other short-term borrowings: Short positions $ 212 $ 555 — $ 767 $ 256 $ 503 — $ 759 Derivative liabilities: Interest rate — 273 — 273 — 288 — 288 Foreign exchange 60 15 — 75 72 31 — 103 Commodity — 1,805 — 1,805 — 408 — 408 Credit — 1 $ 6 7 — — $ 11 11 Other — 11 — 11 — 16 — 16 Derivative liabilities 60 2,105 6 2,171 72 743 11 826 Netting adjustments (b) — — — (1,911) — — — (675) Total derivative liabilities 60 2,105 6 260 72 743 11 151 Total liabilities on a recurring basis at fair value $ 272 $ 2,660 $ 6 $ 1,027 $ 328 $ 1,246 $ 11 $ 910 (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.
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, 2021, as well as financial support provided for the three and nine months ended September 30, 2021, and September 30, 2020. Financial support provided Three months ended September 30, Nine months ended September 30, September 30, 2021 2021 2020 2021 2020 Dollars in millions Fair Value Unfunded Commitments Funded Commitments Funded Other Funded Commitments Funded Other Funded Commitments Funded Other Funded Commitments Funded Other INVESTMENT TYPE Direct investments $ 1 — — — — — — — — — Indirect investments (measured at NAV) (a) 48 $ 13 $ — — 1 — $ 4 — $ 1 — Total $ 49 $ 13 $ — — 1 — $ 4 — $ 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, 2021, 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.
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, 2021, and September 30, 2020. 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, 2021 Securities available for sale Other securities $ 13 $ 9 — — — — — — — $ 22 — Other investments Principal investments Direct (a) 1 — — — — — — — — 1 — Equity investments Direct (a) 13 — $ (1) — — — — — $ (3) 9 $ (1) Loans held for sale (residential) — — — — $ (1) — $ 1 — — — — Loans, net of unearned income (residential) 11 — — — (2) — 1 — — 10 — Derivative instruments (b) Interest rate 56 — (20) (c) $ 1 (7) — — $ 21 (d) (17) (d) 34 — Credit (10) — 4 (c) — — — — — — (6) — Other (e) 32 — (3) (c) — — — (23) — — 6 — Three months ended September 30, 2021 Securities available for sale Other securities $ 22 — — — — — — — — $ 22 — Other investments Principal investments Direct (a) 1 — — — — — — — — 1 — Equity investments Direct (a) 9 — — — — — — — — 9 — Loans held for sale (residential) — — — — — — — — — — — Loans, net of unearned income (residential) 11 — — — (1) — — — — 10 — Derivative instruments (b) Interest rate 35 — $ (5) (c) $ 1 $ (1) — — $ 9 (d) $ (5) (d) 34 — Credit (5) — — (1) — — — — (6) — Other (e) 13 — — (c) — — — $ (7) — — 6 — 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, 2020 Trading account assets Other mortgage-backed securities — — — — $ (9) — — $ 36 — $ 27 — Securities available for sale Other securities $ 11 $ 1 — — — — — — — 12 — Other investments Principal investments Direct (a) 1 — — — — — — — — 1 — Equity investments Direct (a) 12 — $ — — — — — — — 12 — Loans held for sale (residential) — — — — (10) — $ 11 — — 1 — Loans, net of unearned income (residential) 4 — — — (2) — 6 — — 8 — Derivative instruments (b) Interest rate 22 — $ 18 (c) $ 14 (5) — — $ 98 (d) $ (66) (d) 81 — Credit (8) — (6) (c) $ 1 — — — (13) — Other (e) 5 — — — — — 39 — — 44 — Three months ended September 30, 2020 Trading account assets Other mortgage-backed securities $ 36 — — — $ (9) $ — — $ — — $ 27 $ — Securities available for sale Other securities 12 — — — — — — — — 12 — Other investments Principal investments Direct (a) 1 — — — — — — — — 1 — Equity investments Direct (a) 12 $ — 12 — Loans held for sale (residential) — — — — $ — — $ 1 — — 1 — Loans, net of unearned income (residential) 5 — — — — — 3 — — 8 — Derivative instruments (b) Interest rate 52 $ (3) (c) $ 2 $ (4) $ 36 (d) $ (2) (d) 81 Credit (17) — 4 (c) — — — — — — (13) — Other (e) 46 — 5 — — (7) — 44 — (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 Nonrecurring Basis	The following table presents our assets measured at fair value on a nonrecurring basis at September 30, 2021, and December 31, 2020: September 30, 2021 December 31, 2020 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 — — $ 5 $ 5 — — $ 108 $ 108 Accrued income and other assets — — 74 74 — $ — 56 56 Total assets on a nonrecurring basis at fair value — — $ 79 $ 79 — — $ 164 $ 164
Quantitative Information about Level 3 Fair Value Measurements	The range and weighted-average of the significant unobservable inputs used to fair value our material Level 3 recurring and nonrecurring assets at September 30, 2021, and December 31, 2020, along with the valuation techniques used, are shown in the following table: Level 3 Asset (Liability) Valuation Technique Significant Unobservable Input Range (Weighted-Average) (b), (c) Dollars in millions September 30, 2021 December 31, 2020 September 30, 2021 December 31, 2020 Recurring Securities available-for-sale: Other securities $ 22 13 Discounted cash flows Discount rate N/A (16.61%) N/A (15.09%) Marketability discount N/A (30.00%) N/A (30.00%) Volatility factor N/A (55.00%) N/A (44.00%) Other investments: (a) Equity investments Direct 9 13 Discounted cash flows Discount rate N/A (14.15%) 13.90 - 17.04% (15.47%) Marketability discount N/A N/A (30.00%) Volatility factor N/A N/A (52.00%) Loans, net of unearned income (residential) 10 11 Market comparable pricing Comparability factor 64.50 - 97.30% (94.13%) 64.50-99.04% (94.17%) Derivative instruments: Interest rate 34 56 Discounted cash flows Probability of default .02 - 100% (16.60%) .02 - 100% (7.90%) Internal risk rating 1 - 19 (15.133) 1 - 19 (9.675) Loss given default 0 - 1 (.500) 0 - 1 (.483) Credit (assets) — 1 Discounted cash flows Probability of default .02 - 100% (3.10%) .02 - 100% (4.70%) Internal risk rating 1 - 19 (9.024) 1 - 19 (10.478) Loss given default 0 - 1 (.498) 0 - 1 (.490) Credit (liabilities) (6) (11) Discounted cash flows Probability of default .02 - 100% (14.91%) .02 - 100% (15.45%) Internal risk rating 1 - 19 (8.197) 1 - 19 (8.555) Loss given default 0 - 1 (.422) 0 - 1 (.431) Other (d) 6 32 Discounted cash flows Loan closing rates 5.90 - 99.70% (85.17%) 36.95 - 99.68% (77.51%) Nonrecurring Collateral-dependent loans 5 108 Fair value of collateral Discount rate 0 - 0.00% (0.00%) 0 - 100.00% (36.00%) Accrued income and other assets: OREO and other Level 3 assets (e) 12 16 Appraised value Appraised value N/M N/M (a) Principal investments, direct is excluded from this table as the balance at September 30, 2021, and December 31, 2020, is insignificant (less than $1 million). (b) The weighted average of significant unobservable inputs is calculated using a weighting relative to fair value. (c) For significant unobservable inputs with no range, a single figure is reported to denote the single quantitative factor used. (d) Amounts represent interest rate lock commitments. (e) Excludes $62 million and $40 million pertaining to servicing assets at September 30, 2021, and December 31, 2020, 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, 2021, and December 31, 2020, are shown in the following tables. Assets and liabilities are further arranged by measurement category. September 30, 2021 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) $ 902 $ 17 $ 885 — — — $ 902 Other investments (b) 607 — — $ 537 $ 70 — 607 Loans, net of unearned income (residential) (d) 10 — — 10 — — 10 Loans held for sale (residential) (b) 237 — 237 — — — 237 Derivative assets - trading (b) 2,469 65 2,739 7 — $ (342) (f) 2,469 Fair value - OCI Securities available for sale (b) 40,594 — 40,572 22 — — 40,594 Derivative assets - hedging (b)(g) 84 — 45 — — 39 (f) 84 Amortized cost Held-to-maturity securities (c) 8,423 — 8,664 — — — 8,664 Loans, net of unearned income (d) 97,515 — — 97,435 — — 97,435 Loans held for sale (b) 1,568 — — 1,568 — — 1,568 Other Cash and other short-term investments (a) 20,371 20,371 — — — — 20,371 LIABILITIES (by measurement category) Fair value - net income Derivative liabilities - trading (b) $ 249 $ 60 $ 2,093 $ 7 — $ (1,911) (f) $ 249 Fair value - OCI Derivative liabilities - hedging (b)(g) 11 — 11 — — — (f) 11 Amortized cost Time deposits (e) 4,205 — 4,214 — — — 4,214 Short-term borrowings (a) 995 212 783 — — — 995 Long-term debt (e) 13,165 13,076 716 — — — 13,792 Other Deposits with no stated maturity (a) 147,726 — 147,726 — — — 147,726 December 31, 2020 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) $ 735 — $ 735 — — — $ 735 Other investments (b) 621 — — $ 555 $ 66 — 621 Loans, net of unearned income (residential) (d) 11 — — 11 — — 11 Loans held for sale (residential) (b) 264 — 264 — — — 264 Derivative assets - trading (b) 1,676 $ 78 1,939 91 — $ (433) (f) 1,675 Fair value - OCI Securities available for sale (b) 27,556 — 27,543 13 — — 27,556 Derivative assets - hedging (b)(g) 123 — 70 — — 53 (f) 123 Amortized cost Held-to-maturity securities (c) 7,595 — 8,023 — — — 8,023 Loans, net of unearned income (d) 99,548 — — 98,946 — — 98,946 Loans held for sale (b) 1,319 — — 1,319 — — 1,319 Other Short-term investments - U.S. Treasury Bills (b) — — — — — — — Cash and other short-term investments (a) 17,285 17,285 — — — — 17,285 LIABILITIES (by measurement category) Fair value - net income Derivative liabilities - trading (b) $ 154 $ 72 $ 746 $ 11 — $ (675) (f) $ 154 Fair value - OCI Derivative liabilities - hedging (b)(g) (3) — (3) — — — (f) (3) Amortized cost Time deposits (e) 5,743 — 5,765 — — — 5,765 Short-term borrowings (a) 979 256 723 — — — 979 Long-term debt (e) 13,709 13,925 734 — — — 14,659 Other Deposits with no stated maturity (a) 129,539 — 129,539 — — — 129,539 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 2020 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 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 (“1. Summary of Significant Accounting Policies”) under the heading “Derivatives and Hedging” beginning on page 114 of our 2020 Form 10-K.

Securities (Tables)

Securities (Tables)	9 Months Ended
	Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]
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, 2021 December 31, 2020 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 $ 8,960 — $ 22 $ 8,938 $ 1,000 — — $ 1,000 Agency residential collateralized mortgage obligations 16,143 $ 168 207 16,104 14,001 $ 297 $ 25 14,273 Agency residential mortgage-backed securities 5,409 51 52 5,408 2,094 70 — 2,164 Agency commercial mortgage-backed securities 10,141 253 273 10,121 9,707 432 33 10,106 Other securities 8 15 23 8 5 — 13 Total securities available for sale $ 40,661 $ 487 $ 554 $ 40,594 $ 26,810 $ 804 $ 58 $ 27,556 HELD-TO-MATURITY SECURITIES Agency residential collateralized mortgage obligations $ 2,485 $ 69 — $ 2,554 $ 3,775 $ 124 — $ 3,899 Agency residential mortgage-backed securities 184 7 — 191 271 14 — 285 Agency commercial mortgage-backed securities 2,901 165 — 3,066 3,515 290 — 3,805 Asset-backed securities (c) 2,837 — — 2,837 19 — — 19 Other securities 16 — — 16 15 — — 15 Total held-to-maturity securities $ 8,423 $ 241 — $ 8,664 $ 7,595 $ 428 $ — $ 8,023 (a) Amortized cost amounts exclude accrued interes t receivable which is recorded within Other Assets on the balance sheet. At September 30, 2021, accrued interest receivable on available for sale securities and held-to-maturity securities totaled $53 million and $15 million, respectively. (b) Amortized cost amounts exclude accrued interes t receivable which is recorded within Other Assets on the balance sheet. At December 31, 2020, accrued interest receivable on available for sale securities and held-to-maturity securities totaled $42 million and $15 million , respectively. (c) Includes $2.8 billion of securities as of September 30, 2021 related to the purchase of senior notes from a securitization collateralized by sold indirect auto loans.
Schedule of Unrealized Loss on Investments	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, 2021, and December 31, 2020. 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, 2021 Securities available for sale: U.S Treasury, agencies, and corporations $ 8,938 $ 22 — — $ 8,938 $ 22 Agency residential collateralized mortgage obligations 7,647 150 $ 868 $ 57 8,515 207 Agency residential mortgage-backed securities 3,619 52 6 — (a) 3,625 52 Agency commercial mortgage-backed securities 4,219 215 1,093 58 5,312 273 Held-to-maturity securities: Asset-backed securities 1 — (a) 1 — 2 — Other securities 8,460 — (a) — — (a) 8,460 — Total securities in an unrealized loss position $ 32,884 $ 439 $ 1,968 $ 115 $ 34,852 $ 554 December 31, 2020 Securities available for sale: Agency residential collateralized mortgage obligations $ 2,110 $ 25 — — $ 2,110 $ 25 Agency residential mortgage-backed securities 6 — (b) $ 5 — (b) 11 — Agency commercial mortgage-backed securities 2,709 33 — — 2,709 33 Held-to-maturity securities: Agency residential collateralized mortgage obligations — — 24 — (b) 24 — Other securities 5 — (b) — — 5 — Total securities in an unrealized loss position $ 4,830 $ 58 $ 29 — $ 4,859 $ 58 (a) At September 30, 2021, gross unrealized losses totaled less than $1 million for asset-backed securities and other securities held-to-maturity with a loss duration of less than 12 months and asset-backed securities held-to-maturity with a loss duration of 12 months or longer. At September 30, 2021, gross unrealized losses totaled less than $1 million for agency residential mortgage-backed securities available for sale with a loss duration greater than 12 months. (b) At December 31, 2020, gross unrealized losses totaled less than $1 million for agency residential mortgage-backed securities available for sale with a loss duration of less than 12 months and less than $1 million for other securities held-to-maturity with a loss duration of less than 12 months. At December 31, 2020, gross unrealized losses totaled less than $1 million for agency residential mortgage-backed securities available for sale with a loss duration greater than 12 months or longer and less than $1 million for agency residential collateralized mortgage obligations held to maturity with a loss duration greater than 12 months or longer.
Securities by Maturity	The following table shows our securities by remaining maturity. 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, 2021 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 $ 230 $ 247 $ 93 $ 95 Due after one through five years 19,818 20,076 6,330 6,452 Due after five through ten years 17,312 17,128 2,000 2,117 Due after ten years 3,301 3,143 — — Total $ 40,661 $ 40,594 $ 8,423 $ 8,664

Derivatives and Hedging Activ_2

Derivatives and Hedging Activities (Tables)	9 Months Ended
	Sep. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
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, 2021, and December 31, 2020. The derivative asset and liability balances are presented on a gross basis, prior to the application of bilateral collateral and master netting agreements, but after the variation margin payments with central clearing organizations have been applied as settlement, as applicable. 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 balance sheet, as follows: September 30, 2021 December 31, 2020 Fair Value Fair Value Dollars in millions Notional Amount Derivative Assets Derivative Liabilities Notional Amount Derivative Assets Derivative Liabilities Derivatives designated as hedging instruments: Interest rate $ 36,423 $ 45 $ 11 $ 36,135 $ 70 $ (3) Derivatives not designated as hedging instruments: Interest rate 72,688 909 262 78,424 1,514 291 Foreign exchange 7,378 80 75 6,385 109 103 Commodity 15,090 1,799 1,805 9,702 426 408 Credit 339 — 7 423 1 11 Other (a) 3,652 22 11 4,951 58 16 Total 99,147 2,810 2,160 99,885 2,108 829 Netting adjustments (b) — (302) (1,911) — (380) (675) Net derivatives in the balance sheet 135,570 2,553 260 136,020 1,798 151 Other collateral (c) — (1) (30) — (2) (11) Net derivative amounts $ 135,570 $ 2,552 $ 230 $ 136,020 $ 1,796 $ 140 (a) Other derivatives include interest rate lock commitments and 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. (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. (c) 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.
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, 2021, and December 31, 2020, related to cumulative basis adjustments for fair value hedges. September 30, 2021 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 $ 8,077 $ 205 Interest rate contracts Securities Available for Sale (c) 6,280 168 December 31, 2020 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 $ 8,182 $ 416 Interest rate contracts Securities Available for Sale (c) 2,080 21 (a) The carrying amount represents the portion of the 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 ent by $7 million and $8 million at September 30, 2021, and December 31, 2020, respectively, (c) These amounts are designed as fair value hedges under the last-of-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
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, 2021, and September 30, 2020. 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 Interest expense - deposits Other income Three months ended September 30, 2021 Total amounts presented in the consolidated statement of income $ (54) $ 882 $ 135 $ 235 $ (15) $ 25 Net gains (losses) on fair value hedging relationships Interest contracts Recognized on hedged items 37 — (38) — — — Recognized on derivatives designated as hedging instruments (8) — 39 — — — Net income (expense) recognized on fair value hedges $ 29 — $ 1 — — — Net gain (loss) on cash flow hedging relationships Interest contracts Realized gains (losses) (pre-tax) reclassified from AOCI into net income $ (1) $ 79 $ — $ (1) — — Net income (expense) recognized on cash flow hedges $ (1) $ 79 — $ (1) — — Three months ended September 30, 2020 Total amounts presented in the consolidated statement of income $ (64) $ 927 $ 115 $ 146 $ (54) $ 28 Net gains (losses) on fair value hedging relationships Interest contracts Recognized on hedged items $ 47 — — — — — Recognized on derivatives designated as hedging instruments (7) — — — — — Net income (expense) recognized on fair value hedges $ 40 — — — — — Net gain (loss) on cash flow hedging relationships Interest contracts Realized gains (losses) (pre-tax) reclassified from AOCI into net income $ (1) $ 100 — — — — Net income (expense) recognized on cash flow hedges $ (1) $ 100 — — — — 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 Interest expense - deposits Other income Nine months ended September 30, 2021 Total amounts presented in the consolidated statement of income $ (168) $ 2,659 $ 398 $ 614 $ (52) $ 89 Net gains (losses) on fair value hedging relationships Interest contracts Recognized on hedged items 210 — (147) — — — Recognized on derivatives designated as hedging instruments (113) — 147 — — — Net income (expense) recognized on fair value hedges $ 97 — — — — — Net gain (loss) on cash flow hedging relationships Interest contracts Realized gains (losses) (pre-tax) reclassified from AOCI into net income $ (3) $ 253 — — — — Net income (expense) recognized on cash flow hedges $ (3) $ 253 — — — — Nine months ended September 30, 2020 Total amounts presented in the consolidated statement of income $ (225) $ 2,933 $ 365 $ 418 $ (319) $ (27) Net gains (losses) on fair value hedging relationships Interest contracts Recognized on hedged items $ (252) — — — — — Recognized on derivatives designated as hedging instruments 343 — — — — — Net income (expense) recognized on fair value hedges $ 91 — — — — — Net gain (loss) on cash flow hedging relationships Interest contracts Realized gains (losses) (pre-tax) reclassified from AOCI into net income $ (3) $ 224 — — — — Net income (expense) recognized on cash flow hedges $ (3) $ 224 — — — —
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, 2021, and September 30, 2020, 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, 2021 Cash Flow Hedges Interest rate $ (2) Interest income — Loans $ 79 Interest rate — Interest expense — Long-term debt (1) Interest rate 4 Investment banking and debt placement fees (1) Total $ 2 $ 77 Three months ended September 30, 2020 Cash Flow Hedges Interest rate $ 5 Interest income — Loans $ 100 Interest rate — Interest expense — Long-term debt (1) Interest rate 10 Investment banking and debt placement fees — Total $ 15 $ 99 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, 2021 Cash Flow Hedges Interest rate $ (144) Interest income — Loans $ 253 Interest rate 2 Interest expense — Long-term debt (3) Interest rate 9 Investment banking and debt placement fees — Net Investment Hedges Foreign exchange contracts — Other Income — Total $ (133) $ 250 Nine months ended September 30, 2020 Cash Flow Hedges Interest rate $ 629 Interest income — Loans $ 224 Interest rate (6) Interest expense — Long-term debt (3) Interest rate (10) Investment banking and debt placement fees — Net Investment Hedges Foreign exchange contracts — Other Income — Total $ 613 $ 221
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, 2021, and September 30, 2020, and where they are recorded on the income statement. Three months ended September 30, 2021 Three months ended September 30, 2020 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 — — $ 8 $ 5 — $ (1) $ 4 Foreign exchange 12 — — 12 9 — — 9 Commodity 4 — — 4 5 — — 5 Credit 1 — $ (9) (8) 4 — (8) (4) Other — $ — — — — $ 28 (8) 20 Total net gains (losses) $ 25 $ — $ (9) $ 16 $ 23 $ 28 $ (17) $ 34 Nine months ended September 30, 2021 Nine months ended September 30, 2020 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 $ 19 — $ 1 $ 20 $ 23 — $ (10) $ 13 Foreign exchange 34 — — 34 29 — — 29 Commodity 12 — — 12 13 — — 13 Credit 5 — (27) (22) (6) — (20) (26) Other — $ 13 (22) (9) — $ 36 17 53 Total net gains (losses) $ 70 $ 13 $ (48) $ 35 $ 59 $ 36 $ (13) $ 82
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 gross 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, 2021 December 31, 2020 Interest rate $ 838 $ 1,448 Foreign exchange 38 52 Commodity 1,606 178 Credit — (1) Other 22 58 Derivative assets before collateral 2,504 1,735 Plus(Less): Related collateral 49 63 Total derivative assets $ 2,553 $ 1,798
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, 2021, and December 31, 2020. 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, 2021 December 31, 2020 Dollars in millions Notional Amount Average Term (Years) Payment / Performance Risk Notional Amount Average Term (Years) Payment / Performance Risk Other $ 146 13.04 17.88 % $ 227 12.76 19.53 % Total credit derivatives sold $ 146 — — $ 227 — —
Credit Risk Contingent Feature	The following table summarizes the additional cash and securities collateral that KeyBank would have been required to deliver under the ISDA Master Agreements had the credit risk contingent features been triggered for the derivative contracts in a net liability position as of September 30, 2021, and December 31, 2020. The additional collateral amounts were calculated based on scenarios under which KeyBank’s ratings are downgraded one, two, or three ratings as of September 30, 2021, and December 31, 2020, and take into account all collateral already posted. A similar calculation was performed for Ke yCorp, and no addition al collateral would have been required as of September 30, 2021, and December 31, 2020. For more information about the credit ratings for KeyBank and KeyCorp, see the discussion under the heading “Factors affecting liquidity” in the section entitled “Liquidity risk management” in Item 2 of this report. September 30, 2021 December 31, 2020 Dollars in millions Moody’s S&P Moody’s S&P KeyBank’s long-term senior unsecured credit ratings A3 A- A3 A- One rating downgrade $ 2 $ 2 $ 1 $ 1 Two rating downgrades 3 3 1 1 Three rating downgrades 3 3 1 1

Mortgage Servicing Assets (Tabl

Mortgage Servicing Assets (Tables)	9 Months Ended
	Sep. 30, 2021
Servicing Asset [Abstract]
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 2021 2020 2021 2020 Balance at beginning of period $ 600 $ 565 $ 578 $ 539 Servicing retained from loan sales 31 30 88 107 Purchases 8 6 22 24 Amortization (30) (29) (89) (88) Temporary (impairments) recoveries — (6) 10 (16) Balance at end of period $ 609 $ 566 $ 609 $ 566 Fair value at end of period $ 735 $ 685 $ 735 $ 685 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 2021 2020 2021 2020 Balance at beginning of period $ 77 $ 46 $ 58 $ 46 Servicing retained from loan sales 9 12 32 25 Purchases — — — — Amortization (4) (4) (14) (9) Temporary (impairments) recoveries 3 (1) 9 (9) Balance at end of period $ 85 $ 53 $ 85 $ 53 Fair value at end of period $ 89 $ 54 $ 89 $ 54
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, 2021, and September 30, 2020, along with the valuation techniques, are shown in the following table: dollars in millions September 30, 2021 September 30, 2020 Valuation Technique Significant Unobservable Input Range Weighted Average Range Weighted Average Discounted cash flow Expected defaults 1.00 % 2.00 % 1.15 % 1.00 % 2.00 % 1.17 % Residual cash flows discount rate 7.64 % 10.49 % 9.31 % 7.72 % 10.66 % 9.30 % Escrow earn rate 1.04 % 1.37 % 1.04 % 0.92 % 1.16 % 1.05 % Loan assumption rate — % 1.71 % 1.40 % — % 1.78 % 1.39 % September 30, 2021 September 30, 2020 Valuation Technique Significant Unobservable Input Range Weighted Average Range Weighted Average Discounted cash flow Prepayment speed 8.03 % 48.88 % 11.67 % 12.35 % 53.36 % 16.89 % Discount rate 7.50 % 8.57 % 7.54 % 7.51 % 8.80 % 7.57 % Servicing cost $ 62.00 $ 4,375 $ 68.15 $ 62.00 $ 5,125 $ 81.67

Leases (Tables)

Leases (Tables)	9 Months Ended
	Sep. 30, 2021
Leases [Abstract]
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 2021 2020 2021 2020 Sales-type and direct financing leases Interest income on lease receivable $ 13 $ 36 $ 59 $ 91 Interest income related to accretion of unguaranteed residual asset 9 (7) 12 (1) Total sales-type and direct financing lease income 22 29 71 90 Operating leases Operating lease income related to lease payments 31 34 95 103 Other operating leasing gains 6 4 16 25 Total operating lease income and other leasing gains 36 38 111 128 Total lease income $ 58 $ 67 $ 182 $ 218
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 2021 2020 2021 2020 Sales-type and direct financing leases Interest income on lease receivable $ 13 $ 36 $ 59 $ 91 Interest income related to accretion of unguaranteed residual asset 9 (7) 12 (1) Total sales-type and direct financing lease income 22 29 71 90 Operating leases Operating lease income related to lease payments 31 34 95 103 Other operating leasing gains 6 4 16 25 Total operating lease income and other leasing gains 36 38 111 128 Total lease income $ 58 $ 67 $ 182 $ 218
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 2021 2020 2021 2020 Sales-type and direct financing leases Interest income on lease receivable $ 13 $ 36 $ 59 $ 91 Interest income related to accretion of unguaranteed residual asset 9 (7) 12 (1) Total sales-type and direct financing lease income 22 29 71 90 Operating leases Operating lease income related to lease payments 31 34 95 103 Other operating leasing gains 6 4 16 25 Total operating lease income and other leasing gains 36 38 111 128 Total lease income $ 58 $ 67 $ 182 $ 218

Goodwill (Tables)

Goodwill (Tables)	9 Months Ended
	Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	Changes in the carrying amount of goodwill by reporting segment are presented in the following table: Dollars in millions Consumer Bank Commercial Bank Total BALANCE AT SEPTEMBER 30, 2020 $ 1,752 $ 912 $ 2,664 BALANCE AT BALANCE AT DECEMBER 31, 2020 $ 1,752 $ 912 $ 2,664 AQN Strategies acquisition 9 — 9 BALANCE AT SEPTEMBER 30, 2021 $ 1,761 $ 912 $ 2,673

Variable Interest Entities (Tab

Variable Interest Entities (Tables)	9 Months Ended
	Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
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, 2021, and December 31, 2020. As these investments represent unconsolidated VIEs, the assets and liabilities of the investments themselves are not recorded on our balance sheet. Additional information pertaining to our LIHTC investments is included in Note 13 (“Variable Interest Entities”) beginning on page 156 of our 2020 Form 10-K. Unconsolidated VIEs Dollars in millions Total Assets Total Liabilities Maximum Exposure to Loss September 30, 2021 LIHTC investments $ 7,389 $ 2,861 $ 1,882 December 31, 2020 LIHTC investments $ 6,914 $ 2,765 $ 1,823 Unconsolidated VIEs Dollars in millions Total Assets Total Liabilities Maximum Exposure to Loss September 30, 2021 Indirect investments $ 10,199 $ 189 $ 61 December 31, 2020 Indirect investments $ 10,899 $ 168 $ 78 Other unconsolidated VIEs Dollars in millions Total Assets Total Liabilities September 30, 2021 Other unconsolidated VIEs $ 3,166 $ 1 December 31, 2020 Other unconsolidated VIEs $ 351 $ 1

Securities Financing Activiti_2

Securities Financing Activities (Tables)	9 Months Ended
	Sep. 30, 2021
Banking and Thrift, Other Disclosures [Abstract]
Summarized Securities Financing Agreements	The following table summarizes our securities financing agreements at September 30, 2021, and December 31, 2020: September 30, 2021 December 31, 2020 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 $ 11 $ (11) — — $ 6 $ (6) — — Securities borrowed $ 500 $ — $ (500) — $ 500 $ — $ (500) — Total $ 511 $ (11) $ (500) — $ 506 $ (6) $ (500) — Offsetting of financial liabilities: Repurchase agreements (c) $ 229 $ (11) $ (218) — $ 220 $ (6) $ (214) — Total $ 229 $ (11) $ (218) — $ 220 $ (6) $ (214) — (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 mortgaged-backed agency securities and are contracted on an overnight or continuous basis.

Employee Benefits (Tables)

Employee Benefits (Tables)	9 Months Ended
	Sep. 30, 2021
Retirement Benefits [Abstract]
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 164 of our 2020 Form 10-K. Three months ended September 30, Nine months ended September 30, Dollars in millions 2021 2020 2021 2020 Interest cost on PBO $ 6 $ 9 $ 18 $ 26 Expected return on plan assets (7) (10) (21) (29) Amortization of losses 5 5 14 13 Settlement loss 7 — 7 8 Net pension cost $ 11 $ 4 $ 18 $ 18

Trust Preferred Securities Is_2

Trust Preferred Securities Issued by Unconsolidated Subsidiaries (Tables)	9 Months Ended
	Sep. 30, 2021
Banking and Thrift, Other Disclosures [Abstract]
Summary 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, 2021 KeyCorp Capital I $ 156 $ 6 $ 162 0.885 % 2028 KeyCorp Capital II 101 4 105 6.875 2029 KeyCorp Capital III 140 4 144 7.750 2029 HNC Statutory Trust III 20 1 21 1.531 2035 Willow Grove Statutory Trust I 20 1 21 1.409 2036 HNC Statutory Trust IV 17 1 18 1.426 2037 Westbank Capital Trust II 8 — 8 2.312 2034 Westbank Capital Trust III 8 — 8 2.312 2034 Total $ 470 $ 17 $ 486 4.343 % — December 31, 2020 $ 483 $ 17 $ 500 4.464 % — (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 $56 million at September 30, 2021, and $70 million at December 31, 2020. 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. The principal amount of certain debentures includes basis adjustments related to fair value hedges totaling $56 million at September 30, 2021, and $70 million at December 31, 2020. See Note 7 (“Derivatives and Hedging Activities”) for an explanation of fair value hedges. The principal amount of debentures, net of discounts, is included in “long-term debt” on the balance sheet. (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 have a floating interest rate, equal to three-month LIBOR plus 74 basis points, that reprices quarterly. The trust preferred securities issued by HNC Statutory Trust III have a floating interest rate, equal to three-month LIBOR plus 140 basis points, that reprices quarterly. The trust preferred securities issued by Willow Grove Statutory Trust I have a floating interest rate, equal to three-month LIBOR plus 131 basis points, that reprices quarterly. The trust preferred securities issued by HNC Statutory Trust IV have a floating interest rate, equal to three-month LIBOR plus 128 basis points, that reprices quarterly. The trust preferred securities issued by Westbank Capital Trust II and Westbank Capital Trust III each have a floating interest rate, equal to three-month LIBOR plus 219 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, 2021
Commitments and Contingencies Disclosure [Abstract]
Schedule of Guarantees	The following table shows the types of guarantees that we had outstanding at September 30, 2021. 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 116 of our 2020 Form 10-K. September 30, 2021 Maximum Potential Undiscounted Future Payments Liability Recorded Dollars in millions Financial guarantees: Standby letters of credit $ 3,463 $ 83 Recourse agreement with FNMA 6,272 25 Residential mortgage reserve 2,972 14 Written put options (a) 3,835 57 Total $ 16,542 $ 179 (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, 2021
Equity [Abstract]
Changes in AOCI	Our changes in AOCI for the three and nine months ended September 30, 2021, and September 30, 2020, 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, 2020 $ 567 $ 476 $ (305) $ 738 Other comprehensive income before reclassification, net of income taxes (617) 11 (2) (608) Amounts reclassified from AOCI, net of income taxes (a) — (191) 16 (175) Net current-period other comprehensive income, net of income taxes (617) (180) 14 (783) Balance at September 30, 2021 $ (50) $ 296 $ (291) $ (45) Balance at June 30, 2021 $ 124 $ 325 $ (299) $ 150 Other comprehensive income before reclassification, net of income taxes (174) 30 (1) (145) Amounts reclassified from AOCI, net of income taxes (a) — (59) 9 (50) Net current-period other comprehensive income, net of income taxes (174) (29) 8 (195) Balance at September 30, 2021 $ (50) $ 296 $ (291) $ (45) Balance at December 31, 2019 $ 115 $ 250 $ (339) $ 26 Other comprehensive income before reclassification, net of income taxes 530 467 (1) 996 Amounts reclassified from AOCI, net of income taxes (a) (3) (168) 16 (155) Net current-period other comprehensive income, net of income taxes 527 299 15 841 Balance at September 30, 2020 $ 642 $ 549 $ (324) $ 867 Balance at June 30, 2020 $ 650 $ 613 $ (327) $ 936 Other comprehensive income before reclassification, net of income taxes (8) 11 (1) 2 Amounts reclassified from AOCI, net of income taxes (a) — (75) 4 (71) Net current-period other comprehensive income, net of income taxes (8) (64) 3 (69) Balance at September 30, 2020 $ 642 $ 549 $ (324) $ 867 (a) See table below for details about these reclassifications.
Reclassifications Out of AOCI	Our reclassifications out of AOCI for the three and nine months ended September 30, 2021, and September 30, 2020, are as follows: Three months ended September 30, Affected Line Item in the Statement Where Net Income is Presented Dollars in millions 2021 2020 Unrealized gains (losses) on derivative financial instruments Interest rate $ 79 $ 100 Interest income — Loans Interest rate (1) (1) Interest expense — Long-term debt Interest rate (1) — Investment banking and debt placement fees 77 99 Income (loss) from continuing operations before income taxes 18 24 Income taxes $ 59 $ 75 Income (loss) from continuing operations Net pension and postretirement benefit costs Amortization of losses $ (5) $ (5) Other expense Settlement loss (7) — Other expense (12) (5) Income (loss) from continuing operations before income taxes (3) (1) Income taxes $ (9) $ (4) Income (loss) from continuing operations Nine months ended September 30, Affected Line Item in the Statement Where Net Income is Presented Dollars in millions 2021 2020 Unrealized gains (losses) on available for sale securities Realized gains — $ 4 Other income — 4 Income (loss) from continuing operations before income taxes — 1 Income taxes — $ 3 Income (loss) from continuing operations Unrealized gains (losses) on derivative financial instruments Interest rate $ 253 $ 224 Interest income — Loans Interest rate (3) (3) Interest expense — Long-term debt Interest rate — — Investment banking and debt placement fees 250 221 Income (loss) from continuing operations before income taxes 59 53 Income taxes $ 191 $ 168 Income (loss) from continuing operations Net pension and postretirement benefit costs Amortization of losses $ (14) $ (13) Other expense Settlement loss (7) (8) Other expense (21) (21) Income (loss) from continuing operations before income taxes (5) (5) Income taxes $ (16) $ (16) Income (loss) from continuing operations

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	9 Months Ended
	Sep. 30, 2021
Equity [Abstract]
Schedule of Stockholders Equity	Preferred stock series Amount outstanding (in millions) Shares authorized and outstanding Par value Liquidation preference Ownership interest per depositary share Liquidation preference per depositary share Third quarter 2021 dividends paid per depositary share Fixed-to-Floating Rate Perpetual Noncumulative Series D $ 525 21,000 $ 1 $ 25,000 1/25th $ 1,000 $ 12.50 Fixed-to-Floating Rate Perpetual Noncumulative Series E 500 500,000 1 1,000 1/40th 25 .382813 Fixed Rate Perpetual Noncumulative Series F 425 425,000 1 1,000 1/40th 25 .353125 Fixed Rate Perpetual Non-Cumulative Series G 450 450,000 1 1,000 1/40th 25 .351563

Business Segment Reporting (Tab

Business Segment Reporting (Tables)	9 Months Ended
	Sep. 30, 2021
Segment Reporting [Abstract]
Financial Information of Business Groups	The table below shows selected financial data for our business segments for the three- and nine-month periods ended September 30, 2021, and September 30, 2020. 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 2021 2020 2021 2020 2021 2020 2021 2020 SUMMARY OF OPERATIONS Net interest income (TE) $ 582 $ 598 $ 414 $ 427 $ 29 $ (19) $ 1,025 $ 1,006 Noninterest income 288 266 477 384 32 31 797 681 Total revenue (TE) (a) 870 864 891 811 61 12 1,822 1,687 Provision for credit losses (38) (3) (69) 150 — 13 (107) 160 Depreciation and amortization expense 31 19 34 35 22 35 87 89 Other noninterest expense 560 548 436 412 29 (12) 1,025 948 Income (loss) from continuing operations before income taxes (TE) 317 300 490 214 10 (24) 817 490 Allocated income taxes and TE adjustments 76 71 106 41 (8) (46) 174 66 Income (loss) from continuing operations 241 229 384 173 18 22 643 424 Income (loss) from discontinued operations, net of taxes — — — — 2 4 2 4 Net income (loss) 241 229 384 173 20 26 645 428 Less: Net income (loss) attributable to noncontrolling interests — — — — — — — — Net income (loss) attributable to Key $ 241 $ 229 $ 384 $ 173 $ 20 $ 26 $ 645 $ 428 AVERAGE BALANCES (b) Loans and leases $ 39,796 $ 38,354 $ 59,914 $ 66,378 $ 428 $ 187 $ 100,138 $ 104,919 Total assets (a) 42,981 43,304 69,285 74,530 69,105 50,977 181,371 168,811 Deposits 89,156 82,829 56,546 51,585 1,214 530 146,916 134,944 OTHER FINANCIAL DATA Net loan charge-offs (b) $ 35 $ 23 $ (6) $ 103 $ — $ 2 $ 29 $ 128 Return on average allocated equity (b) 25.81 % 26.21 % 18.68 % 13.35 % 1.18 % .96 % 14.25 % 9.51 % Return on average allocated equity 25.81 26.21 18.68 13.35 1.31 1.14 14.30 9.60 Average full-time equivalent employees (c) 7,976 8,323 2,371 2,312 6,662 6,462 17,009 17,097 (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 2021 2020 2021 2020 2021 2020 2021 2020 SUMMARY OF OPERATIONS Net interest income (TE) $ 1,788 $ 1,765 $ 1,244 $ 1,305 $ 28 $ (50) $ 3,060 $ 3,020 Noninterest income 798 740 1,377 1,023 110 87 2,285 1,850 Total revenue (TE) (a) 2,586 2,505 2,621 2,328 138 37 5,345 4,870 Provision for credit losses (132) 289 (267) 697 (23) 15 (422) 1,001 Depreciation and amortization expense 71 59 101 108 95 105 267 272 Other noninterest expense 1,706 1,597 1,263 1,144 23 (32) 2,992 2,709 Income (loss) from continuing operations before income taxes (TE) 941 560 1,524 379 43 (51) 2,508 888 Allocated income taxes and TE adjustments 226 133 324 38 (27) (37) 523 134 Income (loss) from continuing operations 715 427 1,200 341 70 (14) 1,985 754 Income (loss) from discontinued operations, net of taxes — — — — 11 7 11 7 Net income (loss) 715 427 1,200 341 81 (7) 1,996 761 Less: Net income (loss) attributable to noncontrolling interests — — — — — — — — Net income (loss) attributable to Key $ 715 $ 427 $ 1,200 $ 341 $ 81 (d) $ (7) $ 1,996 $ 761 AVERAGE BALANCES (b) Loans and leases $ 39,883 $ 36,319 $ 60,358 $ 66,374 $ 321 $ 325 $ 100,562 $ 103,018 Total assets (a) 43,094 40,644 69,607 75,205 64,493 43,897 177,194 159,746 Deposits 87,549 78,414 54,660 45,350 814 691 143,023 124,455 OTHER FINANCIAL DATA Net loan charge-offs (b) $ 105 $ 106 $ 81 $ 200 (21) 2 $ 165 $ 308 Return on average allocated equity (b) 26.70 % 16.66 % 18.92 % 9.19 % 1.62 % (.20) % 14.87 % 5.74 % Return on average allocated equity 26.70 16.66 18.92 9.19 1.87 (.10) 14.96 5.79 Average full-time equivalent employees (c) 8,062 8,171 2,371 2,288 6,601 6,299 17,034 16,758 (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, 2021
Revenue from Contract with Customer [Abstract]
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, 2021, and September 30, 2020. 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, 2021 Three months ended September 30, 2020 Dollars in millions Consumer Bank Commercial Bank Total Contract Revenue Consumer Bank Commercial Bank Total Contract Revenue NONINTEREST INCOME Trust and investment services income $ 105 $ 16 $ 121 $ 100 $ 15 $ 115 Investment banking and debt placement fees — 169 169 — 69 69 Services charges on deposit accounts 56 35 91 45 32 77 Cards and payments income 46 61 107 43 69 112 Other noninterest income 2 — 2 3 — 3 Total revenue from contracts with customers $ 209 $ 281 $ 490 $ 191 $ 185 $ 376 Other noninterest income (a) $ 275 $ 274 Noninterest income from Other (b) 32 31 Total noninterest income $ 797 $ 681 (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, 2021 Nine months ended September 30, 2020 Dollars in millions Consumer Bank Commercial Bank Total Contract Revenue Consumer Bank Commercial Bank Total Contract Revenue NONINTEREST INCOME Trust and investment services income $ 311 $ 49 $ 360 $ 279 $ 49 $ 328 Investment banking and debt placement fees — 367 367 — 176 176 Services charges on deposit accounts 145 102 247 138 91 229 Cards and payments income 135 187 322 118 147 265 Other noninterest income 5 2 7 7 — 7 Total revenue from contracts with customers $ 596 $ 707 $ 1,303 $ 542 $ 463 $ 1,005 Other noninterest income (a) $ 872 $ 758 Noninterest income from Other (b) 110 87 Total noninterest income $ 2,285 $ 1,850 (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.

Earnings Per Common Share - Bas

Earnings Per Common Share - Basic and Diluted Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
EARNINGS
Income (loss) from continuing operations		$ 643	$ 424	$ 1,985	$ 754
Less: Net income (loss) attributable to noncontrolling interests		0	0	0	0
Income (loss) from continuing operations attributable to Key		643	424	1,985	754
Less: Dividends on Preferred Stock		27	27	80	80
Income (loss) from continuing operations attributable to Key common shareholders		616	397	1,905	674
Income (loss) from discontinued operations, net of taxes		2	4	11	7
Net income (loss) attributable to Key common shareholders		$ 618	$ 401	$ 1,916	$ 681
WEIGHTED-AVERAGE COMMON SHARES
Weighted-average common shares outstanding (000) (in shares)		942,446	967,804	955,069	967,632
Effect of common share options and other stock awards (in shares)		10,077	6,184	9,712	6,648
Weighted-average common shares and potential common shares outstanding (in shares)	[1]	952,523	973,988	964,781	974,280
EARNINGS PER COMMON SHARE
Income (loss) from continuing operations attributable to Key common shareholders (in usd per share)		$ 0.65	$ 0.41	$ 1.99	$ 0.70
Income (loss) from discontinued operations, net of taxes (in usd per share)		0	0	0.01	0.01
Net income (loss) attributable to Key common shareholders (in usd per share)	[2]	0.66	0.41	2	0.70
Income (loss) from continuing operations attributable to Key common shareholders - assuming dilution (in usd per share)		0.65	0.41	1.98	0.69
Income (loss) from discontinued operations, net of taxes - assuming dilution (in usd per share)		0	0	0.01	0.01
Net income (loss) attributable to Key common shareholders (in usd per share)	[2]	$ 0.65	$ 0.41	$ 1.99	$ 0.70
[1]	Assumes conversion of Common Share options and other stock awards and/or convertible preferred stock, as applicable.
[2]	EPS may not foot due to rounding.

Loan Portfolio - Loans by Categ

Loan Portfolio - Loans by Category (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 98,609	$ 101,185
Accrued interest	211	241
Commercial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	69,329	71,980
Accrued interest	117	140
Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	29,280	29,205
Accrued interest	95	101
Commercial and Industrial | Commercial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	49,553	52,907
Commercial mortgage | Commercial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	13,674	12,687
Construction | Commercial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	2,120	1,987
Commercial real estate loans | Commercial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	15,794	14,674
Commercial lease financing | Commercial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	3,982	4,399
Real estate — residential mortgage | Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	14,204	9,298
Home equity loans | Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	8,747	9,360
Residential - Prime Loans | Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	22,951	18,658
Consumer direct loans | Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	5,324	4,714
Credit cards | Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	928	989
Consumer indirect loans | Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	77	4,844
Commercial credit card | Commercial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	139	127
Commercial credit card | Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	928	989
Collateral pledged | Commercial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	16	23
Education Lending | Discontinued Operations
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 602	$ 710

Asset Quality - Changes in Allo

Asset Quality - Changes in Allowance for Loan and Lease Losses by Loan Category (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 1,220	$ 1,708	$ 1,626	$ 900
Provision	(107)	150	(377)	934
Charge-offs	(66)	(151)	(272)	(362)
Recoveries	37	23	107	54
Ending balance	1,084	1,730	1,084	1,730
Total ALLL, including discontinued operations, beginning balance	1,250	1,751	1,662	910
Total provision, including discontinued operations	(108)	149	(383)	936
Total charge-offs, including discontinued operations	(67)	(151)	(275)	(366)
Total recoveries, including discontinued operations	38	23	109	57
Total ALLL, including discontinued operations, ending balance	1,113	1,772	1,113	1,772
Provision (credit) for losses on lending-related commitments	0	10	(45)	67
Impact of ASC 326 Adoption
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				204
Total ALLL, including discontinued operations, beginning balance				235
Adjusted balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				1,104
Total ALLL, including discontinued operations, beginning balance				1,145
Commercial Loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	795	1,113	1,099	751
Provision	(89)	181	(284)	797
Charge-offs	(28)	(124)	(185)	(266)
Recoveries	27	11	75	23
Ending balance	705	1,181	705	1,181
Commercial Loans | Impact of ASC 326 Adoption
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				(124)
Commercial Loans | Adjusted balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				627
Consumer Loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	425	595	527	149
Provision	(18)	(31)	(93)	137
Charge-offs	(38)	(27)	(87)	(96)
Recoveries	10	12	32	31
Ending balance	379	549	379	549
Consumer Loans | Impact of ASC 326 Adoption
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				328
Consumer Loans | Adjusted balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				477
Commercial and Industrial | Commercial Loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	499	725	678	551
Provision	(30)	177	(135)	613
Charge-offs	(27)	(101)	(141)	(232)
Recoveries	20	9	60	19
Ending balance	462	810	462	810
Commercial and Industrial | Commercial Loans | Impact of ASC 326 Adoption
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				(141)
Commercial and Industrial | Commercial Loans | Adjusted balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				410
Commercial mortgage | Commercial Loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	227	292	327	143
Provision	(44)	(2)	(112)	135
Charge-offs	0	(13)	(39)	(18)
Recoveries	1	2	8	3
Ending balance	184	279	184	279
Commercial mortgage | Commercial Loans | Impact of ASC 326 Adoption
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				16
Commercial mortgage | Commercial Loans | Adjusted balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				159
Construction | Commercial Loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	35	41	47	22
Provision	(8)	(7)	(20)	19
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Ending balance	27	34	27	34
Construction | Commercial Loans | Impact of ASC 326 Adoption
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				(7)
Construction | Commercial Loans | Adjusted balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				15
Commercial real estate loans | Commercial Loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	262	333	374	165
Provision	(52)	(9)	(132)	154
Charge-offs	0	(13)	0	(18)
Recoveries	1	2	0	3
Ending balance	211	313	211	313
Commercial real estate loans | Commercial Loans | Impact of ASC 326 Adoption
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				9
Commercial real estate loans | Commercial Loans | Adjusted balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				174
Commercial lease financing | Commercial Loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	34	55	47	35
Provision	(7)	13	(17)	30
Charge-offs	(1)	(10)	(5)	(16)
Recoveries	6	0	7	1
Ending balance	32	58	32	58
Commercial lease financing | Commercial Loans | Impact of ASC 326 Adoption
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				8
Commercial lease financing | Commercial Loans | Adjusted balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				43
Real estate — residential mortgage | Consumer Loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	86	101	102	7
Provision	(1)	2	(17)	21
Charge-offs	2	0	1	(2)
Recoveries	1	1	2	1
Ending balance	88	104	88	104
Real estate — residential mortgage | Consumer Loans | Impact of ASC 326 Adoption
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				77
Real estate — residential mortgage | Consumer Loans | Adjusted balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				84
Home equity loans | Consumer Loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	136	197	171	31
Provision	(13)	(13)	(44)	9
Charge-offs	(1)	(4)	(7)	(10)
Recoveries	2	3	4	6
Ending balance	124	183	124	183
Home equity loans | Consumer Loans | Impact of ASC 326 Adoption
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				147
Home equity loans | Consumer Loans | Adjusted balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				178
Consumer direct loans | Consumer Loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	115	130	128	34
Provision	(5)	1	(7)	52
Charge-offs	(7)	(8)	(22)	(30)
Recoveries	2	2	6	6
Ending balance	105	125	105	125
Consumer direct loans | Consumer Loans | Impact of ASC 326 Adoption
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				63
Consumer direct loans | Consumer Loans | Adjusted balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				97
Credit cards | Consumer Loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	68	107	87	47
Provision	(4)	(5)	(13)	39
Charge-offs	(6)	(9)	(21)	(32)
Recoveries	1	2	6	6
Ending balance	59	95	59	95
Credit cards | Consumer Loans | Impact of ASC 326 Adoption
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				35
Credit cards | Consumer Loans | Adjusted balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				82
Consumer indirect loans | Consumer Loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	20	60	39	30
Provision	5	(16)	(12)	16
Charge-offs	(26)	(6)	(38)	(22)
Recoveries	4	4	14	12
Ending balance	3	42	3	42
Consumer indirect loans | Consumer Loans | Impact of ASC 326 Adoption
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				6
Consumer indirect loans | Consumer Loans | Adjusted balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				36
Discontinued Operations
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	30	43	36	10
Provision	(1)	(1)	(6)	2
Charge-offs	(1)	0	(3)	(4)
Recoveries	1	0	2	3
Ending balance	$ 29	$ 42	$ 29	42
Discontinued Operations | Impact of ASC 326 Adoption
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				31
Discontinued Operations | Adjusted balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				$ 41

Asset Quality - Additional Info

Asset Quality - Additional Information (Details) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2021USD ($)SecurityLoan	Mar. 31, 2021USD ($)	Sep. 30, 2020USD ($)SecurityLoan	Sep. 30, 2021USD ($)SecurityLoan	Sep. 30, 2020USD ($)SecurityLoan	Dec. 31, 2020USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income (residential)	$ 98,609			$ 98,609		$ 101,185
Loans that have received payment deferral or forbearance, CARES Act				174
Loan modifications and forbearance, CARES Act				124
Accrued interest	$ 211			$ 211		241
Percentage of carrying amount of our commercial nonperforming loans outstanding	62.00%			62.00%
Percentage of nonperforming loans outstanding face value	72.00%			72.00%
Percentage of loans held for sale and other nonperforming assets	77.00%			77.00%
Net reduction to interest income	$ 6		$ 7	$ 20	$ 20
Commitments outstanding to lend additional funds to borrowers (less than $1 million)	21			21		1
Financial receivable, modifications, subsequent default, recorded investment	2		$ 1	4	$ 4
Commercial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued interest	$ 117			$ 117		140
TDRs, period for default				90 days
Number of loans | SecurityLoan	2		0	5	0
Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued interest	$ 95			$ 95		$ 101
TDRs, period for default				60 days
Number of loans | SecurityLoan	33		33	98	160
Continuing operations | Commercial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Decrease in ALLL	$ (90)
Decrease in ALLL (as a percent)	(11.30%)
Continuing operations | Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Decrease in ALLL	$ (46)
Decrease in ALLL (as a percent)	(10.80%)
PPP
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income (residential)	$ 3,100			$ 3,100
Nonperforming financial instruments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonperforming loans on nonaccrual status with no allowance	$ 492			492
Real estate — residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivable, modifications, subsequent default, recorded investment		$ 92		$ 70

Asset Quality - Commercial Cred

Asset Quality - Commercial Credit Exposure (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 98,609	$ 101,185
Accrued interest	211	241
Commercial Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current	13,562	16,230
One year prior	8,364	10,657
Two years prior	8,782	7,206
Three years prior	5,554	4,635
Four years prior	3,556	3,237
Prior	8,500	7,295
Revolving Loans Amortized Cost Basis	20,807	22,529
Revolving Loans Converted to Term Loans Amortized Cost Basis	204	191
Total	69,329	71,980
Accrued interest	117	140
Commercial Loans | Commercial and Industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Current	9,355	13,174
One year prior	5,544	5,712
Two years prior	4,702	4,285
Three years prior	3,419	2,881
Four years prior	2,258	2,134
Prior	4,108	2,995
Revolving Loans Amortized Cost Basis	20,035	21,585
Revolving Loans Converted to Term Loans Amortized Cost Basis	132	141
Total	49,553	52,907
Commercial Loans | Commercial and Industrial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current	9,315	13,100
One year prior	5,420	5,487
Two years prior	4,491	4,040
Three years prior	3,186	2,617
Four years prior	2,016	1,967
Prior	3,884	2,709
Revolving Loans Amortized Cost Basis	18,950	19,832
Revolving Loans Converted to Term Loans Amortized Cost Basis	102	118
Total	47,364	49,870
Commercial Loans | Commercial and Industrial | Criticized (Accruing)
Financing Receivable, Credit Quality Indicator [Line Items]
Current	40	66
One year prior	115	198
Two years prior	193	174
Three years prior	192	236
Four years prior	236	150
Prior	208	279
Revolving Loans Amortized Cost Basis	925	1,527
Revolving Loans Converted to Term Loans Amortized Cost Basis	27	22
Total	1,936	2,652
Commercial Loans | Commercial and Industrial | Criticized (Nonaccruing)
Financing Receivable, Credit Quality Indicator [Line Items]
Current	0	8
One year prior	9	27
Two years prior	18	71
Three years prior	41	28
Four years prior	6	17
Prior	16	7
Revolving Loans Amortized Cost Basis	160	226
Revolving Loans Converted to Term Loans Amortized Cost Basis	3	1
Total	253	385
Commercial Loans | Commercial mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Current	3,234	1,603
One year prior	1,378	3,080
Two years prior	2,677	1,822
Three years prior	1,428	1,016
Four years prior	811	839
Prior	3,338	3,370
Revolving Loans Amortized Cost Basis	742	912
Revolving Loans Converted to Term Loans Amortized Cost Basis	66	45
Total	13,674	12,687
Commercial Loans | Commercial mortgage | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current	3,219	1,591
One year prior	1,357	2,937
Two years prior	2,589	1,737
Three years prior	1,338	867
Four years prior	687	765
Prior	3,073	3,027
Revolving Loans Amortized Cost Basis	690	885
Revolving Loans Converted to Term Loans Amortized Cost Basis	64	43
Total	13,017	11,852
Commercial Loans | Commercial mortgage | Criticized (Accruing)
Financing Receivable, Credit Quality Indicator [Line Items]
Current	15	12
One year prior	20	142
Two years prior	87	81
Three years prior	85	145
Four years prior	123	72
Prior	228	255
Revolving Loans Amortized Cost Basis	48	22
Revolving Loans Converted to Term Loans Amortized Cost Basis	2	2
Total	608	731
Commercial Loans | Commercial mortgage | Criticized (Nonaccruing)
Financing Receivable, Credit Quality Indicator [Line Items]
Current	0	0
One year prior	1	1
Two years prior	1	4
Three years prior	5	4
Four years prior	1	2
Prior	37	88
Revolving Loans Amortized Cost Basis	4	5
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	49	104
Commercial Loans | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Current	318	367
One year prior	623	778
Two years prior	623	548
Three years prior	344	206
Four years prior	126	27
Prior	50	24
Revolving Loans Amortized Cost Basis	30	32
Revolving Loans Converted to Term Loans Amortized Cost Basis	6	5
Total	2,120	1,987
Commercial Loans | Construction | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current	318	367
One year prior	619	764
Two years prior	610	510
Three years prior	292	188
Four years prior	104	27
Prior	49	22
Revolving Loans Amortized Cost Basis	29	31
Revolving Loans Converted to Term Loans Amortized Cost Basis	6	5
Total	2,027	1,914
Commercial Loans | Construction | Criticized (Accruing)
Financing Receivable, Credit Quality Indicator [Line Items]
Current	0	0
One year prior	4	14
Two years prior	13	38
Three years prior	52	18
Four years prior	22	0
Prior	1	2
Revolving Loans Amortized Cost Basis	1	1
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	93	73
Commercial Loans | 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
Commercial Loans | Commercial lease financing
Financing Receivable, Credit Quality Indicator [Line Items]
Current	655	1,086
One year prior	819	1,087
Two years prior	780	551
Three years prior	363	532
Four years prior	361	237
Prior	1,004	906
Revolving Loans Amortized Cost Basis		0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	3,982	4,399
Commercial Loans | Commercial lease financing | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current	655	1,076
One year prior	815	1,050
Two years prior	744	534
Three years prior	348	504
Four years prior	347	228
Prior	997	901
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	3,906	4,293
Commercial Loans | Commercial lease financing | Criticized (Accruing)
Financing Receivable, Credit Quality Indicator [Line Items]
Current	0	10
One year prior	4	35
Two years prior	35	15
Three years prior	14	26
Four years prior	13	7
Prior	5	4
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	71	97
Commercial Loans | Commercial lease financing | Criticized (Nonaccruing)
Financing Receivable, Credit Quality Indicator [Line Items]
Current	0	0
One year prior	0	2
Two years prior	1	2
Three years prior	1	2
Four years prior	1	2
Prior	2	1
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	$ 5	$ 9

Asset Quality - Consumer Credit

Asset Quality - Consumer Credit Exposure (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 98,609	$ 101,185
Accrued interest	211	241
Consumer Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current	10,467	10,075
One year prior	6,466	5,436
Two years prior	2,429	1,499
Three years prior	501	1,040
Four years prior	432	1,119
Prior	3,081	3,224
Revolving Loans Amortized Cost Basis	5,235	5,953
Revolving Loans Converted to Term Loans Amortized Cost Basis	669	859
Total	29,280	29,205
Accrued interest	95	101
Consumer Loans | Real estate — residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Current	7,413	4,322
One year prior	3,570	1,934
Two years prior	1,139	293
Three years prior	169	319
Four years prior	186	665
Prior	1,726	1,765
Revolving Loans Amortized Cost Basis	1	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	14,204	9,298
Consumer Loans | Real estate — residential mortgage | FICO Score, 750 and above
Financing Receivable, Credit Quality Indicator [Line Items]
Current	6,071	3,595
One year prior	3,150	1,620
Two years prior	933	194
Three years prior	104	254
Four years prior	141	537
Prior	1,218	1,211
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	11,617	7,411
Consumer Loans | Real estate — residential mortgage | FICO Score, 660 to 749
Financing Receivable, Credit Quality Indicator [Line Items]
Current	1,300	710
One year prior	407	284
Two years prior	186	76
Three years prior	47	48
Four years prior	31	100
Prior	323	332
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	2,294	1,550
Consumer Loans | Real estate — residential mortgage | FICO Score, Less than 660
Financing Receivable, Credit Quality Indicator [Line Items]
Current	23	16
One year prior	12	28
Two years prior	19	21
Three years prior	16	10
Four years prior	10	26
Prior	151	170
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	231	271
Consumer Loans | Real estate — residential mortgage | FICO Score, No Score
Financing Receivable, Credit Quality Indicator [Line Items]
Current	19	1
One year prior	1	2
Two years prior	1	2
Three years prior	2	7
Four years prior	4	2
Prior	34	52
Revolving Loans Amortized Cost Basis	1	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	62	66
Consumer Loans | Home equity loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current	1,284	1,457
One year prior	1,208	634
Two years prior	435	269
Three years prior	177	299
Four years prior	201	279
Prior	1,062	1,207
Revolving Loans Amortized Cost Basis	3,711	4,357
Revolving Loans Converted to Term Loans Amortized Cost Basis	669	858
Total	8,747	9,360
Consumer Loans | Home equity loans | FICO Score, 750 and above
Financing Receivable, Credit Quality Indicator [Line Items]
Current	919	1,043
One year prior	885	404
Two years prior	285	168
Three years prior	113	202
Four years prior	139	190
Prior	739	839
Revolving Loans Amortized Cost Basis	2,333	2,689
Revolving Loans Converted to Term Loans Amortized Cost Basis	462	590
Total	5,875	6,125
Consumer Loans | Home equity loans | FICO Score, 660 to 749
Financing Receivable, Credit Quality Indicator [Line Items]
Current	345	385
One year prior	295	198
Two years prior	130	82
Three years prior	49	77
Four years prior	47	69
Prior	222	253
Revolving Loans Amortized Cost Basis	1,037	1,237
Revolving Loans Converted to Term Loans Amortized Cost Basis	158	206
Total	2,283	2,507
Consumer Loans | Home equity loans | FICO Score, Less than 660
Financing Receivable, Credit Quality Indicator [Line Items]
Current	20	27
One year prior	26	30
Two years prior	20	18
Three years prior	14	20
Four years prior	15	20
Prior	99	113
Revolving Loans Amortized Cost Basis	336	426
Revolving Loans Converted to Term Loans Amortized Cost Basis	48	61
Total	578	715
Consumer Loans | Home equity loans | FICO Score, No Score
Financing Receivable, Credit Quality Indicator [Line Items]
Current	0	2
One year prior	2	2
Two years prior	0	1
Three years prior	1	0
Four years prior	0	0
Prior	2	2
Revolving Loans Amortized Cost Basis	5	5
Revolving Loans Converted to Term Loans Amortized Cost Basis	1	1
Total	11	13
Consumer Loans | Consumer direct loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current	1,766	2,407
One year prior	1,688	1,223
Two years prior	855	237
Three years prior	155	83
Four years prior	45	45
Prior	220	111
Revolving Loans Amortized Cost Basis	595	607
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	1
Total	5,324	4,714
Consumer Loans | Consumer direct loans | FICO Score, 750 and above
Financing Receivable, Credit Quality Indicator [Line Items]
Current	1,287	1,840
One year prior	1,271	883
Two years prior	594	115
Three years prior	76	32
Four years prior	20	16
Prior	137	57
Revolving Loans Amortized Cost Basis	109	119
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	3,494	3,062
Consumer Loans | Consumer direct loans | FICO Score, 660 to 749
Financing Receivable, Credit Quality Indicator [Line Items]
Current	413	479
One year prior	350	268
Two years prior	200	80
Three years prior	51	22
Four years prior	13	14
Prior	48	33
Revolving Loans Amortized Cost Basis	217	254
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	1
Total	1,292	1,151
Consumer Loans | Consumer direct loans | FICO Score, Less than 660
Financing Receivable, Credit Quality Indicator [Line Items]
Current	19	23
One year prior	22	37
Two years prior	29	21
Three years prior	12	8
Four years prior	3	5
Prior	14	10
Revolving Loans Amortized Cost Basis	61	81
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	160	185
Consumer Loans | Consumer direct loans | FICO Score, No Score
Financing Receivable, Credit Quality Indicator [Line Items]
Current	47	65
One year prior	45	35
Two years prior	32	21
Three years prior	16	21
Four years prior	9	10
Prior	21	11
Revolving Loans Amortized Cost Basis	208	153
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	378	316
Consumer Loans | Commercial credit card
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	928	989
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	928	989
Consumer Loans | Commercial credit card | FICO Score, 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	472	488
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	472	488
Consumer Loans | Commercial credit card | FICO Score, 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	375	407
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	375	407
Consumer Loans | Commercial credit card | FICO Score, 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	72	93
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	72	93
Consumer Loans | Commercial credit card | FICO Score, 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	9	1
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	9	1
Consumer Loans | Consumer indirect loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current	4	1,889
One year prior	0	1,645
Two years prior	0	700
Three years prior	0	339
Four years prior	0	130
Prior	73	141
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	77	4,844
Consumer Loans | Consumer indirect loans | FICO Score, 750 and above
Financing Receivable, Credit Quality Indicator [Line Items]
Current	4	1,092
One year prior	0	924
Two years prior	0	369
Three years prior	0	188
Four years prior	0	69
Prior	36	66
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	40	2,708
Consumer Loans | Consumer indirect loans | FICO Score, 660 to 749
Financing Receivable, Credit Quality Indicator [Line Items]
Current	0	653
One year prior	0	558
Two years prior	0	232
Three years prior	0	97
Four years prior	0	36
Prior	26	47
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	26	1,623
Consumer Loans | Consumer indirect loans | FICO Score, Less than 660
Financing Receivable, Credit Quality Indicator [Line Items]
Current	0	143
One year prior	0	163
Two years prior	0	99
Three years prior	0	54
Four years prior	0	25
Prior	11	28
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	11	512
Consumer Loans | Consumer indirect loans | FICO Score, No Score
Financing Receivable, Credit Quality Indicator [Line Items]
Current	0	1
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	$ 1

Asset Quality - Aging Analysis

Asset Quality - Aging Analysis of Past Due and Current Loans (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Total loans	$ 98,609	$ 101,185
Accrued interest	211	241
Commercial Loans
Financing Receivable, Past Due [Line Items]
Total loans	69,329	71,980
Accrued interest	117	140
Consumer Loans
Financing Receivable, Past Due [Line Items]
Total loans	29,280	29,205
Accrued interest	95	101
Commercial and Industrial | Commercial Loans
Financing Receivable, Past Due [Line Items]
Total loans	49,553	52,907
Commercial mortgage | Commercial Loans
Financing Receivable, Past Due [Line Items]
Total loans	13,674	12,687
Commercial real estate: Construction | Commercial Loans
Financing Receivable, Past Due [Line Items]
Total loans	2,120	1,987
Commercial real estate loans | Commercial Loans
Financing Receivable, Past Due [Line Items]
Total loans	15,794	14,674
Commercial lease financing | Commercial Loans
Financing Receivable, Past Due [Line Items]
Total loans	3,982	4,399
Real estate — residential mortgage | Consumer Loans
Financing Receivable, Past Due [Line Items]
Total loans	14,204	9,298
Home equity loans | Consumer Loans
Financing Receivable, Past Due [Line Items]
Total loans	8,747	9,360
Consumer direct loans | Consumer Loans
Financing Receivable, Past Due [Line Items]
Total loans	5,324	4,714
Commercial credit card | Commercial Loans
Financing Receivable, Past Due [Line Items]
Total loans	139	127
Commercial credit card | Consumer Loans
Financing Receivable, Past Due [Line Items]
Total loans	928	989
Consumer indirect loans | Consumer Loans
Financing Receivable, Past Due [Line Items]
Total loans	77	4,844
Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Total loans	97,809	100,073
Financial Asset, Not Past Due | Commercial Loans
Financing Receivable, Past Due [Line Items]
Total loans	68,858	71,299
Financial Asset, Not Past Due | Consumer Loans
Financing Receivable, Past Due [Line Items]
Total loans	28,951	28,774
Financial Asset, Not Past Due | Commercial and Industrial | Commercial Loans
Financing Receivable, Past Due [Line Items]
Total loans	49,161	52,396
Financial Asset, Not Past Due | Commercial mortgage | Commercial Loans
Financing Receivable, Past Due [Line Items]
Total loans	13,606	12,548
Financial Asset, Not Past Due | Commercial real estate: Construction | Commercial Loans
Financing Receivable, Past Due [Line Items]
Total loans	2,118	1,986
Financial Asset, Not Past Due | Commercial real estate loans | Commercial Loans
Financing Receivable, Past Due [Line Items]
Total loans	15,724	14,534
Financial Asset, Not Past Due | Commercial lease financing | Commercial Loans
Financing Receivable, Past Due [Line Items]
Total loans	3,973	4,369
Financial Asset, Not Past Due | Real estate — residential mortgage | Consumer Loans
Financing Receivable, Past Due [Line Items]
Total loans	14,096	9,173
Financial Asset, Not Past Due | Home equity loans | Consumer Loans
Financing Receivable, Past Due [Line Items]
Total loans	8,559	9,143
Financial Asset, Not Past Due | Consumer direct loans | Consumer Loans
Financing Receivable, Past Due [Line Items]
Total loans	5,307	4,694
Financial Asset, Not Past Due | Commercial credit card | Consumer Loans
Financing Receivable, Past Due [Line Items]
Total loans	914	972
Financial Asset, Not Past Due | Consumer indirect loans | Consumer Loans
Financing Receivable, Past Due [Line Items]
Total loans	75	4,792
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	109	148
30-59 Days Past Due | Commercial Loans
Financing Receivable, Past Due [Line Items]
Total loans	71	66
30-59 Days Past Due | Consumer Loans
Financing Receivable, Past Due [Line Items]
Total loans	38	82
30-59 Days Past Due | Commercial and Industrial | Commercial Loans
Financing Receivable, Past Due [Line Items]
Total loans	56	36
30-59 Days Past Due | Commercial mortgage | Commercial Loans
Financing Receivable, Past Due [Line Items]
Total loans	12	9
30-59 Days Past Due | Commercial real estate: Construction | Commercial Loans
Financing Receivable, Past Due [Line Items]
Total loans	1	0
30-59 Days Past Due | Commercial real estate loans | Commercial Loans
Financing Receivable, Past Due [Line Items]
Total loans	13	9
30-59 Days Past Due | Commercial lease financing | Commercial Loans
Financing Receivable, Past Due [Line Items]
Total loans	2	21
30-59 Days Past Due | Real estate — residential mortgage | Consumer Loans
Financing Receivable, Past Due [Line Items]
Total loans	6	11
30-59 Days Past Due | Home equity loans | Consumer Loans
Financing Receivable, Past Due [Line Items]
Total loans	22	34
30-59 Days Past Due | Consumer direct loans | Consumer Loans
Financing Receivable, Past Due [Line Items]
Total loans	6	7
30-59 Days Past Due | Commercial credit card | Consumer Loans
Financing Receivable, Past Due [Line Items]
Total loans	3	5
30-59 Days Past Due | Consumer indirect loans | Consumer Loans
Financing Receivable, Past Due [Line Items]
Total loans	1	25
60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	55	93
60-89 Days Past Due | Commercial Loans
Financing Receivable, Past Due [Line Items]
Total loans	36	56
60-89 Days Past Due | Consumer Loans
Financing Receivable, Past Due [Line Items]
Total loans	19	37
60-89 Days Past Due | Commercial and Industrial | Commercial Loans
Financing Receivable, Past Due [Line Items]
Total loans	33	50
60-89 Days Past Due | Commercial mortgage | Commercial Loans
Financing Receivable, Past Due [Line Items]
Total loans	2	5
60-89 Days Past Due | Commercial real estate: Construction | Commercial Loans
Financing Receivable, Past Due [Line Items]
Total loans	0	0
60-89 Days Past Due | Commercial real estate loans | Commercial Loans
Financing Receivable, Past Due [Line Items]
Total loans	2	5
60-89 Days Past Due | Commercial lease financing | Commercial Loans
Financing Receivable, Past Due [Line Items]
Total loans	1	1
60-89 Days Past Due | Real estate — residential mortgage | Consumer Loans
Financing Receivable, Past Due [Line Items]
Total loans	3	3
60-89 Days Past Due | Home equity loans | Consumer Loans
Financing Receivable, Past Due [Line Items]
Total loans	10	20
60-89 Days Past Due | Consumer direct loans | Consumer Loans
Financing Receivable, Past Due [Line Items]
Total loans	3	4
60-89 Days Past Due | Commercial credit card | Consumer Loans
Financing Receivable, Past Due [Line Items]
Total loans	3	3
60-89 Days Past Due | Consumer indirect loans | Consumer Loans
Financing Receivable, Past Due [Line Items]
Total loans	0	7
90 and Greater Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	82	86
90 and Greater Days Past Due | Commercial Loans
Financing Receivable, Past Due [Line Items]
Total loans	57	62
90 and Greater Days Past Due | Consumer Loans
Financing Receivable, Past Due [Line Items]
Total loans	25	24
90 and Greater Days Past Due | Commercial and Industrial | Commercial Loans
Financing Receivable, Past Due [Line Items]
Total loans	50	40
90 and Greater Days Past Due | Commercial mortgage | Commercial Loans
Financing Receivable, Past Due [Line Items]
Total loans	5	21
90 and Greater Days Past Due | Commercial real estate: Construction | Commercial Loans
Financing Receivable, Past Due [Line Items]
Total loans	1	1
90 and Greater Days Past Due | Commercial real estate loans | Commercial Loans
Financing Receivable, Past Due [Line Items]
Total loans	6	22
90 and Greater Days Past Due | Commercial lease financing | Commercial Loans
Financing Receivable, Past Due [Line Items]
Total loans	1	0
90 and Greater Days Past Due | Real estate — residential mortgage | Consumer Loans
Financing Receivable, Past Due [Line Items]
Total loans	6	1
90 and Greater Days Past Due | Home equity loans | Consumer Loans
Financing Receivable, Past Due [Line Items]
Total loans	10	9
90 and Greater Days Past Due | Consumer direct loans | Consumer Loans
Financing Receivable, Past Due [Line Items]
Total loans	4	4
90 and Greater Days Past Due | Commercial credit card | Consumer Loans
Financing Receivable, Past Due [Line Items]
Total loans	5	7
90 and Greater Days Past Due | Consumer indirect loans | Consumer Loans
Financing Receivable, Past Due [Line Items]
Total loans	0	3
Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Total loans	800	1,112
Financial Asset, Past Due | Commercial Loans
Financing Receivable, Past Due [Line Items]
Total loans	471	681
Financial Asset, Past Due | Consumer Loans
Financing Receivable, Past Due [Line Items]
Total loans	329	431
Financial Asset, Past Due | Commercial and Industrial | Commercial Loans
Financing Receivable, Past Due [Line Items]
Total loans	392	511
Financial Asset, Past Due | Commercial mortgage | Commercial Loans
Financing Receivable, Past Due [Line Items]
Total loans	68	139
Financial Asset, Past Due | Commercial real estate: Construction | Commercial Loans
Financing Receivable, Past Due [Line Items]
Total loans	2	1
Financial Asset, Past Due | Commercial real estate loans | Commercial Loans
Financing Receivable, Past Due [Line Items]
Total loans	70	140
Financial Asset, Past Due | Commercial lease financing | Commercial Loans
Financing Receivable, Past Due [Line Items]
Total loans	9	30
Financial Asset, Past Due | Real estate — residential mortgage | Consumer Loans
Financing Receivable, Past Due [Line Items]
Total loans	108	125
Financial Asset, Past Due | Home equity loans | Consumer Loans
Financing Receivable, Past Due [Line Items]
Total loans	188	217
Financial Asset, Past Due | Consumer direct loans | Consumer Loans
Financing Receivable, Past Due [Line Items]
Total loans	17	20
Financial Asset, Past Due | Commercial credit card | Consumer Loans
Financing Receivable, Past Due [Line Items]
Total loans	14	17
Financial Asset, Past Due | Consumer indirect loans | Consumer Loans
Financing Receivable, Past Due [Line Items]
Total loans	2	52
Nonperforming financial instruments
Financing Receivable, Past Due [Line Items]
Total loans	554	785
Nonperforming financial instruments | Commercial Loans
Financing Receivable, Past Due [Line Items]
Total loans	307	497
Nonperforming financial instruments | Consumer Loans
Financing Receivable, Past Due [Line Items]
Total loans	247	288
Nonperforming financial instruments | Commercial and Industrial | Commercial Loans
Financing Receivable, Past Due [Line Items]
Total loans	253	385
Nonperforming financial instruments | Commercial mortgage | Commercial Loans
Financing Receivable, Past Due [Line Items]
Total loans	49	104
Nonperforming financial instruments | Commercial real estate: Construction | Commercial Loans
Financing Receivable, Past Due [Line Items]
Total loans	0	0
Nonperforming financial instruments | Commercial real estate loans | Commercial Loans
Financing Receivable, Past Due [Line Items]
Total loans	49	104
Nonperforming financial instruments | Commercial lease financing | Commercial Loans
Financing Receivable, Past Due [Line Items]
Total loans	5	8
Nonperforming financial instruments | Real estate — residential mortgage | Consumer Loans
Financing Receivable, Past Due [Line Items]
Total loans	93	110
Nonperforming financial instruments | Home equity loans | Consumer Loans
Financing Receivable, Past Due [Line Items]
Total loans	146	154
Nonperforming financial instruments | Consumer direct loans | Consumer Loans
Financing Receivable, Past Due [Line Items]
Total loans	4	5
Nonperforming financial instruments | Commercial credit card | Consumer Loans
Financing Receivable, Past Due [Line Items]
Total loans	3	2
Nonperforming financial instruments | Consumer indirect loans | Consumer Loans
Financing Receivable, Past Due [Line Items]
Total loans	$ 1	$ 17

Asset Quality - Post-Modificati

Asset Quality - Post-Modification Outstanding Recorded Investment by Concession Type for Our Commercial Accruing and Nonaccruing TDRs (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total commercial and consumer TDRs	$ 15	$ 19	$ 36	$ 48
Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Extension of Maturity Date	0	0	5	8
Payment or Covenant Modification/Deferment	0	0	7	0
Bankruptcy Plan Modification	0	0	0	0
Increase in new commitment or new money	0	0	0	0
Total	0	0	12	8
Consumer Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Interest rate reduction	3	13	6	22
Other	12	6	18	18
Total	$ 15	$ 19	$ 24	$ 40

Asset Quality - Summary of Post

Asset Quality - Summary of Post-Modification Outstanding Recorded Investment TDRs (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Financing Receivables, Modifications, Rollforward [Roll Forward]
Balance at beginning of the period	$ 334	$ 310	$ 363	$ 347
Additions	17	26	98	65
Payments	(81)	(22)	(162)	(75)
Charge-offs	0	(8)	(29)	(31)
Balance at end of period	$ 270	$ 306	$ 270	$ 306

Asset Quality - Breakdown of No

Asset Quality - Breakdown of Nonperforming TDRs by Loans Category (Details) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2021USD ($)SecurityLoan	Dec. 31, 2020USD ($)SecurityLoan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | SecurityLoan	4,417	6,133
Pre-modification Outstanding Recorded Investment	$ 375	$ 478
Post-modification Outstanding Recorded Investment	$ 270	$ 363
Prior-Year accruing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | SecurityLoan	3,040	3,743
Pre-modification Outstanding Recorded Investment	$ 163	$ 184
Post-modification Outstanding Recorded Investment	$ 124	$ 134
Prior-Year accruing | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | SecurityLoan	8	3
Pre-modification Outstanding Recorded Investment	$ 49	$ 5
Post-modification Outstanding Recorded Investment	$ 26	$ 0
Prior-Year accruing | Consumer Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | SecurityLoan	3,032	3,740
Pre-modification Outstanding Recorded Investment	$ 164	$ 179
Post-modification Outstanding Recorded Investment	$ 124	$ 134
Nonperforming financial instruments
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | SecurityLoan	1,377	2,390
Pre-modification Outstanding Recorded Investment	$ 212	$ 294
Post-modification Outstanding Recorded Investment	$ 146	$ 229
Nonperforming financial instruments | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | SecurityLoan	38	73
Pre-modification Outstanding Recorded Investment	$ 142	$ 198
Post-modification Outstanding Recorded Investment	$ 82	$ 142
Nonperforming financial instruments | Consumer Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | SecurityLoan	1,339	2,317
Pre-modification Outstanding Recorded Investment	$ 70	$ 96
Post-modification Outstanding Recorded Investment	$ 64	$ 87
Commercial and Industrial | Prior-Year accruing | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | SecurityLoan	7	3
Pre-modification Outstanding Recorded Investment	$ 49	$ 5
Post-modification Outstanding Recorded Investment	$ 26	$ 0
Commercial and Industrial | Nonperforming financial instruments | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | SecurityLoan	35	66
Pre-modification Outstanding Recorded Investment	$ 92	$ 136
Post-modification Outstanding Recorded Investment	$ 53	$ 92
Commercial mortgage | Prior-Year accruing | Commercial Real Estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | SecurityLoan	1	0
Pre-modification Outstanding Recorded Investment	$ 0	$ 0
Post-modification Outstanding Recorded Investment	$ 0	$ 0
Commercial mortgage | Nonperforming financial instruments | Commercial Real Estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | SecurityLoan	3	7
Pre-modification Outstanding Recorded Investment	$ 50	$ 62
Post-modification Outstanding Recorded Investment	$ 29	$ 50
Commercial real estate loans | Prior-Year accruing | Commercial Real Estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | SecurityLoan	1	0
Pre-modification Outstanding Recorded Investment	$ 0	$ 0
Post-modification Outstanding Recorded Investment	$ 0	$ 0
Commercial real estate loans | Nonperforming financial instruments | Commercial Real Estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | SecurityLoan	3	7
Pre-modification Outstanding Recorded Investment	$ 50	$ 62
Post-modification Outstanding Recorded Investment	$ 29	$ 50
Real estate — residential mortgage | Prior-Year accruing | Consumer Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | SecurityLoan	464	485
Pre-modification Outstanding Recorded Investment	$ 39	$ 37
Post-modification Outstanding Recorded Investment	$ 34	$ 31
Real estate — residential mortgage | Nonperforming financial instruments | Consumer Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | SecurityLoan	218	258
Pre-modification Outstanding Recorded Investment	$ 26	$ 35
Post-modification Outstanding Recorded Investment	$ 25	$ 34
Home equity loans | Prior-Year accruing | Consumer Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | SecurityLoan	1,648	1,781
Pre-modification Outstanding Recorded Investment	$ 100	$ 106
Post-modification Outstanding Recorded Investment	$ 78	$ 83
Home equity loans | Nonperforming financial instruments | Consumer Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | SecurityLoan	569	630
Pre-modification Outstanding Recorded Investment	$ 38	$ 41
Post-modification Outstanding Recorded Investment	$ 33	$ 37
Consumer direct loans | Prior-Year accruing | Consumer Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | SecurityLoan	206	163
Pre-modification Outstanding Recorded Investment	$ 5	$ 4
Post-modification Outstanding Recorded Investment	$ 3	$ 3
Consumer direct loans | Nonperforming financial instruments | Consumer Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | SecurityLoan	201	212
Pre-modification Outstanding Recorded Investment	$ 3	$ 3
Post-modification Outstanding Recorded Investment	$ 3	$ 3
Credit cards | Prior-Year accruing | Consumer Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | SecurityLoan	564	536
Pre-modification Outstanding Recorded Investment	$ 4	$ 3
Post-modification Outstanding Recorded Investment	$ 1	$ 1
Credit cards | Nonperforming financial instruments | Consumer Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | SecurityLoan	328	356
Pre-modification Outstanding Recorded Investment	$ 2	$ 2
Post-modification Outstanding Recorded Investment	$ 2	$ 2
Consumer indirect loans | Prior-Year accruing | Consumer Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | SecurityLoan	150	775
Pre-modification Outstanding Recorded Investment	$ 16	$ 29
Post-modification Outstanding Recorded Investment	$ 8	$ 16
Consumer indirect loans | Nonperforming financial instruments | Consumer Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | SecurityLoan	23	861
Pre-modification Outstanding Recorded Investment	$ 1	$ 15
Post-modification Outstanding Recorded Investment	$ 1	$ 11

Asset Quality - Changes in Liab

Asset Quality - Changes in Liability for Credit Losses on Lending Related Commitments (Details) - USD ($) $ in Millions	Jan. 01, 2020	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at the end of the prior period	$ 68	$ 152	$ 198	$ 197	$ 68	$ 197	$ 68	$ 68
Liability for credit losses on contingent guarantees at the end of the prior period				0	0			0	$ 7
Balance at beginning of period		152	208	152	198	152	208	197	68
Provision (credit) for losses on off balance sheet exposures		0	10			(45)	67
Balance at end of period		152	208	152	198	152	208	197	68
Impact of ASC 326 Adoption
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Cumulative effect from changes in accounting principle				0	0			0	66
Adjusted balance
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at the end of the prior period	141	$ 152	$ 198	197	141	$ 197	$ 141	141
Balance at beginning of period				152	198			197	141
Balance at end of period				$ 152	$ 198			$ 197	$ 141
Other Financial Assets | Impact of ASC 326 Adoption
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Cumulative effect from changes in accounting principle	$ 4

Fair Value Measurements - Fair

Fair Value Measurements - Fair Value of Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	$ 902	$ 735
Securities available for sale	40,594	27,556
Loans, net of unearned income (residential)	98,609	101,185
Derivative assets, netting adjustments	(302)	(380)
Total derivative assets	2,553	1,798
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities, netting adjustments	(1,911)	(675)
Other
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets, gross	6
Recurring
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	889	717
Commercial loans	13	18
Total trading account assets	902	735
Securities available for sale	40,594	27,556
Total other investments	80	81
Loans, net of unearned income (residential)	10	11
Loans held for sale (residential)	237	264
Derivative assets, gross	2,855	2,178
Derivative assets, netting adjustments	(302)	(380)
Total derivative assets	2,553	1,798
Accrued income and other assets	0	0
Total assets at fair value	44,376	30,445
LIABILITIES MEASURED ON A RECURRING BASIS
Total liabilities on a recurring basis at fair value	1,027	910
Recurring | U.S. Treasury, agencies and corporations
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	747	633
Securities available for sale	8,938	1,000
Recurring | States and political subdivisions
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	91	24
Securities available for sale	0	0
Recurring | Other securities
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	30	13
Securities available for sale	23	13
Recurring | Agency commercial mortgage-backed securities
ASSETS MEASURED ON A RECURRING BASIS
Securities available for sale	10,121	10,106
Recurring | Principal investments, Direct
ASSETS MEASURED ON A RECURRING BASIS
Total other investments	1	1
Recurring | Principal Investments
ASSETS MEASURED ON A RECURRING BASIS
Total other investments	49	54
Recurring | Equity Investments, Direct
ASSETS MEASURED ON A RECURRING BASIS
Total other investments	9	13
Recurring | Equity Investments
ASSETS MEASURED ON A RECURRING BASIS
Total other investments	31	27
Recurring | Mortgage-backed securities
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	21	47
Recurring | Mortgage-backed securities | Agency residential mortgage-backed securities
ASSETS MEASURED ON A RECURRING BASIS
Securities available for sale	5,408	2,164
Recurring | Short positions
LIABILITIES MEASURED ON A RECURRING BASIS
Short positions	767	759
Recurring | Long positions
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities, gross	2,171	826
Derivative liabilities, netting adjustments	(1,911)	(675)
Total derivative liabilities	260	151
Recurring | Interest rate
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets, gross	954	1,584
Recurring | Interest rate | Long positions
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities, gross	273	288
Recurring | Foreign exchange
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets, gross	80	109
Recurring | Foreign exchange | Long positions
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities, gross	75	103
Recurring | Commodity
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets, gross	1,799	426
Recurring | Commodity | Long positions
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities, gross	1,805	408
Recurring | Credit
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets, gross	0	1
Recurring | Credit | Long positions
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities, gross	7	11
Recurring | Other
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets, gross	22	58
Recurring | Other | Long positions
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities, gross	11	16
Level 1 | Recurring
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	17	0
Commercial loans	0	0
Total trading account assets	17	0
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, gross	65	78
Derivative assets, netting adjustments	0	0
Total derivative assets	65	78
Accrued income and other assets	0	0
Total assets at fair value	82	78
LIABILITIES MEASURED ON A RECURRING BASIS
Total liabilities on a recurring basis at fair value	272	328
Level 1 | Recurring | U.S. Treasury, agencies and corporations
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	0	0
Securities available for sale	0	0
Level 1 | Recurring | States and political subdivisions
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	0	0
Securities available for sale	0	0
Level 1 | Recurring | Other securities
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	17	0
Securities available for sale	0	0
Level 1 | Recurring | Agency commercial mortgage-backed securities
ASSETS MEASURED ON A RECURRING BASIS
Securities available for sale	0	0
Level 1 | Recurring | Principal investments, Direct
ASSETS MEASURED ON A RECURRING BASIS
Total other investments	0	0
Level 1 | Recurring | Principal Investments
ASSETS MEASURED ON A RECURRING BASIS
Total other investments	0	0
Level 1 | Recurring | Equity Investments, Direct
ASSETS MEASURED ON A RECURRING BASIS
Total other investments	0	0
Level 1 | Recurring | Equity Investments
ASSETS MEASURED ON A RECURRING BASIS
Total other investments	0	0
Level 1 | Recurring | Mortgage-backed securities
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	0	0
Level 1 | Recurring | Mortgage-backed securities | Agency residential mortgage-backed securities
ASSETS MEASURED ON A RECURRING BASIS
Securities available for sale	0	0
Level 1 | Recurring | Short positions
LIABILITIES MEASURED ON A RECURRING BASIS
Short positions	212	256
Level 1 | Recurring | Long positions
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities, gross	60	72
Derivative liabilities, netting adjustments	0	0
Total derivative liabilities	60	72
Level 1 | Recurring | Interest rate
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets, gross	0	0
Level 1 | Recurring | Interest rate | Long positions
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities, gross	0	0
Level 1 | Recurring | Foreign exchange
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets, gross	65	78
Level 1 | Recurring | Foreign exchange | Long positions
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities, gross	60	72
Level 1 | Recurring | Commodity
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets, gross	0	0
Level 1 | Recurring | Commodity | Long positions
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities, gross	0	0
Level 1 | Recurring | Credit
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets, gross	0	0
Level 1 | Recurring | Credit | Long positions
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities, gross	0	0
Level 1 | Recurring | Other
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets, gross	0	0
Level 1 | Recurring | Other | Long positions
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities, gross	0	0
Level 2 | Recurring
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	872	717
Commercial loans	13	18
Total trading account assets	885	735
Securities available for sale	40,572	27,543
Total other investments	0	0
Loans, net of unearned income (residential)	0	0
Loans held for sale (residential)	237	264
Derivative assets, gross	2,750	2,009
Derivative assets, netting adjustments	0	0
Total derivative assets	2,750	2,009
Accrued income and other assets	0	0
Total assets at fair value	44,444	30,551
LIABILITIES MEASURED ON A RECURRING BASIS
Total liabilities on a recurring basis at fair value	2,660	1,246
Level 2 | Recurring | U.S. Treasury, agencies and corporations
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	747	633
Securities available for sale	8,938	1,000
Level 2 | Recurring | States and political subdivisions
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	91	24
Securities available for sale	0	0
Level 2 | Recurring | Other securities
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	13	13
Securities available for sale	1	0
Level 2 | Recurring | Agency commercial mortgage-backed securities
ASSETS MEASURED ON A RECURRING BASIS
Securities available for sale	10,121	10,106
Level 2 | Recurring | Principal investments, Direct
ASSETS MEASURED ON A RECURRING BASIS
Total other investments	0	0
Level 2 | Recurring | Principal Investments
ASSETS MEASURED ON A RECURRING BASIS
Total other investments	0	0
Level 2 | Recurring | Equity Investments, Direct
ASSETS MEASURED ON A RECURRING BASIS
Total other investments	0	0
Level 2 | Recurring | Equity Investments
ASSETS MEASURED ON A RECURRING BASIS
Total other investments	0	0
Level 2 | Recurring | Mortgage-backed securities
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	21	47
Level 2 | Recurring | Mortgage-backed securities | Agency residential mortgage-backed securities
ASSETS MEASURED ON A RECURRING BASIS
Securities available for sale	5,408	2,164
Level 2 | Recurring | Short positions
LIABILITIES MEASURED ON A RECURRING BASIS
Short positions	555	503
Level 2 | Recurring | Long positions
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities, gross	2,105	743
Derivative liabilities, netting adjustments	0	0
Total derivative liabilities	2,105	743
Level 2 | Recurring | Interest rate
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets, gross	920	1,528
Level 2 | Recurring | Interest rate | Long positions
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities, gross	273	288
Level 2 | Recurring | Foreign exchange
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets, gross	15	31
Level 2 | Recurring | Foreign exchange | Long positions
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities, gross	15	31
Level 2 | Recurring | Commodity
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets, gross	1,799	424
Level 2 | Recurring | Commodity | Long positions
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities, gross	1,805	408
Level 2 | Recurring | Credit
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets, gross	0	0
Level 2 | Recurring | Credit | Long positions
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities, gross	1	0
Level 2 | Recurring | Other
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets, gross	16	26
Level 2 | Recurring | Other | Long positions
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities, gross	11	16
Level 3 | Recurring
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	0	0
Commercial loans	0	0
Total trading account assets	0	0
Securities available for sale	22	13
Total other investments	10	14
Loans, net of unearned income (residential)	10	11
Loans held for sale (residential)	0	0
Derivative assets, gross	40	91
Derivative assets, netting adjustments	0	0
Total derivative assets	40	91
Accrued income and other assets	0	0
Total assets at fair value	82	129
LIABILITIES MEASURED ON A RECURRING BASIS
Total liabilities on a recurring basis at fair value	6	11
Level 3 | Recurring | U.S. Treasury, agencies and corporations
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	0	0
Securities available for sale	0	0
Level 3 | Recurring | States and political subdivisions
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	0	0
Securities available for sale	0	0
Level 3 | Recurring | Other securities
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	0	0
Securities available for sale	22	13
Level 3 | Recurring | Agency commercial mortgage-backed securities
ASSETS MEASURED ON A RECURRING BASIS
Securities available for sale	0	0
Level 3 | Recurring | Principal investments, Direct
ASSETS MEASURED ON A RECURRING BASIS
Total other investments	1	1
Level 3 | Recurring | Principal Investments
ASSETS MEASURED ON A RECURRING BASIS
Total other investments	1	1
Level 3 | Recurring | Equity Investments, Direct
ASSETS MEASURED ON A RECURRING BASIS
Total other investments	9	13
Level 3 | Recurring | Equity Investments
ASSETS MEASURED ON A RECURRING BASIS
Total other investments	9	13
Level 3 | Recurring | Mortgage-backed securities
ASSETS MEASURED ON A RECURRING BASIS
Total trading account securities	0	0
Level 3 | Recurring | Mortgage-backed securities | Agency residential mortgage-backed securities
ASSETS MEASURED ON A RECURRING BASIS
Securities available for sale	0	0
Level 3 | Recurring | Short positions
LIABILITIES MEASURED ON A RECURRING BASIS
Short positions	0	0
Level 3 | Recurring | Long positions
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities, gross	6	11
Derivative liabilities, netting adjustments	0	0
Total derivative liabilities	6	11
Level 3 | Recurring | Interest rate
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets, gross	34	56
Level 3 | Recurring | Interest rate | Long positions
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities, gross	0	0
Level 3 | Recurring | Foreign exchange
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets, gross	0	0
Level 3 | Recurring | Foreign exchange | Long positions
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities, gross	0	0
Level 3 | Recurring | Commodity
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets, gross	0	2
Level 3 | Recurring | Commodity | Long positions
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities, gross	0	0
Level 3 | Recurring | Credit
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets, gross	0	1
Level 3 | Recurring | Credit | Long positions
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities, gross	6	11
Level 3 | Recurring | Other
ASSETS MEASURED ON A RECURRING BASIS
Derivative assets, gross		32
Level 3 | Recurring | Other | Long positions
LIABILITIES MEASURED ON A RECURRING BASIS
Derivative liabilities, gross	0	0
Measured at NAV | Recurring | Equity Investments Direct, NAV
ASSETS MEASURED ON A RECURRING BASIS
Total other investments	16	7
Measured at NAV | Recurring | Equity Investments Indirect, NAV
ASSETS MEASURED ON A RECURRING BASIS
Total other investments	6	7
Agency residential collateralized mortgage obligations | Recurring
ASSETS MEASURED ON A RECURRING BASIS
Securities available for sale	16,104	14,273
Agency residential collateralized mortgage obligations | Level 1 | Recurring
ASSETS MEASURED ON A RECURRING BASIS
Securities available for sale	0	0
Agency residential collateralized mortgage obligations | Level 2 | Recurring
ASSETS MEASURED ON A RECURRING BASIS
Securities available for sale	16,104	14,273
Agency residential collateralized mortgage obligations | Level 3 | Recurring
ASSETS MEASURED ON A RECURRING BASIS
Securities available for sale	0	0
Variable Interest Entity, Not Primary Beneficiary | Measured at NAV | Recurring | Principal Investments, Indirect
ASSETS MEASURED ON A RECURRING BASIS
Total other investments	$ 48	$ 53

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Details) - USD ($)	3 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other equity investments	$ 168,000,000	$ 171,000,000
Impairment loss	0
Loans, net of allowance	97,525,000,000	99,559,000,000
Discontinued Operations | Education Lending
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans at fair value	2,000,000	2,000,000
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans at fair value	10,000,000	11,000,000
Carrying Amount | Discontinued Operations | Education Lending
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans, net of allowance	602,000,000	674,000,000
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans at fair value	10,000,000	11,000,000
Fair Value | Nonrecurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities measured at fair value on non recurring basis	0	0
Fair Value | Discontinued Operations | Education Lending
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans, net of allowance	518,000,000	567,000,000
Level 3 | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans at fair value	$ 10,000,000	$ 11,000,000

Fair Value Measurements - Fai_2

Fair Value Measurements - 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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	$ 49		$ 49
Unfunded Commitments	13		13
Funded Commitments	0	$ 1	4	$ 1
Funded Other	0	0	0	0
Direct investments
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	1		1
Unfunded Commitments	0		0
Funded Commitments	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	48		48
Unfunded Commitments	13		13
Funded Commitments	0	1	4	1
Funded Other	$ 0	$ 0	$ 0	$ 0

Fair Value Measurements - Chang

Fair Value Measurements - Change in Fair Values of Level 3 Financial Instruments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Other investments
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning of Period Balance	$ 9	$ 12	$ 13	$ 12
Gains (Losses) Included in Other Comprehensive Income	0		0	0
Gains (Losses) Included in Earnings	0	0	(1)	0
Purchases	0		0	0
Sales	0		0	0
Settlements	0		0	0
Transfers Other	0		0	0
Transfers into Level 3	0		0	0
Transfers out of Level 3	0		(3)	0
End of Period Balance	9	12	9	12
Unrealized Gains (Losses) Included in Earnings	0	0	(1)	0
Other investments | Principal investments, Direct
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning of Period Balance	1	1	1	1
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	0	0	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
End of Period Balance	1	1	1	1
Unrealized Gains (Losses) Included in Earnings	0	0	0	0
Securities available for sale | Other securities
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning of Period Balance	22	12	13	11
Gains (Losses) Included in Other Comprehensive Income	0	0	9	1
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		0	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0		0	0
End of Period Balance	22	12	22	12
Unrealized Gains (Losses) Included in Earnings	0	0	0	0
Interest rate
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning of Period Balance	35	52	56	22
Gains (Losses) Included in Other Comprehensive Income	0		0	0
Gains (Losses) Included in Earnings	(5)	(3)	(20)	18
Purchases	1	2	1	14
Sales	(1)	(4)	(7)	(5)
Settlements	0		0	0
Transfers Other	0		0	0
Transfers into Level 3	9	36	21	98
Transfers out of Level 3	(5)	(2)	(17)	(66)
End of Period Balance	34	81	34	81
Unrealized Gains (Losses) Included in Earnings	0		0	0
Credit
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning of Period Balance	(5)	(17)	(10)	(8)
Gains (Losses) Included in Other Comprehensive Income	0	0	0	0
Gains (Losses) Included in Earnings	0	4	4	(6)
Purchases	(1)	0	0	1
Sales	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
End of Period Balance	(6)	(13)	(6)	(13)
Unrealized Gains (Losses) Included in Earnings	0	0	0	0
Other
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning of Period Balance	13	46	32	5
Gains (Losses) Included in Other Comprehensive Income	0	0	0	0
Gains (Losses) Included in Earnings	0	5	(3)	0
Purchases	0	0	0	0
Sales	0		0	0
Settlements	0	0	0	0
Transfers Other	(7)	(7)	(23)	(39)
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0		0	0
End of Period Balance	6	44	6	44
Unrealized Gains (Losses) Included in Earnings	0	0	0	0
Loans held for sale (residential)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning of Period Balance	0	0	0	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	(1)	(10)
Settlements	0	0	0	0
Transfers Other	0	1	1	(11)
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
End of Period Balance	0	1	0	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	5	11	4
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	(1)	0	(2)	(2)
Settlements	0	0	0	0
Transfers Other	0	3	1	(6)
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
End of Period Balance	10	8	10	8
Unrealized Gains (Losses) Included in Earnings	$ 0	0	$ 0	0
Trading account assets | Other mortgage-backed securities
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning of Period Balance		36		0
Gains (Losses) Included in Other Comprehensive Income		0		0
Gains (Losses) Included in Earnings		0		0
Purchases		0		0
Sales		(9)		(9)
Settlements		0		0
Transfers Other		0		0
Transfers into Level 3		0		36
Transfers out of Level 3		0
End of Period Balance		27		27
Unrealized Gains (Losses) Included in Earnings		$ 0		$ 0

Fair Value Measurements - Asset

Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Nonrecurring Basis (Details) - Nonrecurring - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
ASSETS MEASURED ON A NONRECURRING BASIS
Collateral-dependent loans	$ 5	$ 108
Accrued income and other assets	74	56
Total assets at fair value	79	164
Level 1
ASSETS MEASURED ON A NONRECURRING BASIS
Collateral-dependent loans	0	0
Accrued income and other assets	0	0
Total assets 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 at fair value	0	0
Level 3
ASSETS MEASURED ON A NONRECURRING BASIS
Collateral-dependent loans	5	108
Accrued income and other assets	74	56
Total assets at fair value	$ 79	$ 164

Fair Value Measurements - Quant

Fair Value Measurements - Quantitative Information about Level 3 Fair Value Measurements (Details) $ in Millions	Sep. 30, 2021USD ($)	Dec. 31, 2020USD ($)
Fair Value, Option, Quantitative Disclosures [Line Items]
Securities available for sale	$ 40,594	$ 27,556
Derivative assets	2,553	1,798
Mortgage servicing assets excluded from OREO	62	40
Recurring
Fair Value, Option, Quantitative Disclosures [Line Items]
Securities available for sale	40,594	27,556
Other investments	80	81
Derivative assets	2,553	1,798
Nonrecurring
Fair Value, Option, Quantitative Disclosures [Line Items]
Impaired loans	5	108
Level 3 | Recurring
Fair Value, Option, Quantitative Disclosures [Line Items]
Securities available for sale	22	13
Other investments	10	14
Derivative assets	40	91
Level 3 | Nonrecurring
Fair Value, Option, Quantitative Disclosures [Line Items]
Impaired loans	5	108
Valuation Technique, Discounted Cash Flow | Level 3 | Recurring
Fair Value, Option, Quantitative Disclosures [Line Items]
Other investments	$ 9	$ 13
Valuation Technique, Discounted Cash Flow | Measurement Input, Discount Rate | Level 3 | Recurring
Fair Value, Option, Quantitative Disclosures [Line Items]
Securities available for sale, measurement input	0.1661	0.1509
Valuation Technique, Discounted Cash Flow | Measurement Input, Discount Rate | Level 3 | Recurring | Minimum
Fair Value, Option, Quantitative Disclosures [Line Items]
Other investments, measurement input		0.1390
Valuation Technique, Discounted Cash Flow | Measurement Input, Discount Rate | Level 3 | Recurring | Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
Other investments, measurement input		0.1704
Valuation Technique, Discounted Cash Flow | Measurement Input, Discount Rate | Level 3 | Recurring | Weighted Average
Fair Value, Option, Quantitative Disclosures [Line Items]
Other investments, measurement input	0.1415	0.1547
Valuation Technique, Discounted Cash Flow | Measurement Input, Discount Marketability | Level 3 | Recurring
Fair Value, Option, Quantitative Disclosures [Line Items]
Securities available for sale, measurement input	0.3000	0.3000
Other investments, measurement input		0.3000
Valuation Technique, Discounted Cash Flow | Measurement Input, Price Volatility | Level 3 | Recurring
Fair Value, Option, Quantitative Disclosures [Line Items]
Securities available for sale, measurement input	0.5500	0.4400
Other investments, measurement input		0.5200
Valuation, Market Comparable Pricing | Level 3 | Recurring
Fair Value, Option, Quantitative Disclosures [Line Items]
Loans, net of unearned income (residential)	$ 10	$ 11
Valuation, Market Comparable Pricing | Measurement Input, Comparability Adjustment | Level 3 | Recurring | Minimum
Fair Value, Option, Quantitative Disclosures [Line Items]
Loans, net of unearned income (residential), measurement input	0.6450	0.6450
Valuation, Market Comparable Pricing | Measurement Input, Comparability Adjustment | Level 3 | Recurring | Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
Loans, net of unearned income (residential), measurement input	0.9730	0.9904
Valuation, Market Comparable Pricing | Measurement Input, Comparability Adjustment | Level 3 | Recurring | Weighted Average
Fair Value, Option, Quantitative Disclosures [Line Items]
Loans, net of unearned income (residential), measurement input	0.9413	0.9417
Valuation, Fair Value Of Underlying Collateral | Level 3 | Nonrecurring
Fair Value, Option, Quantitative Disclosures [Line Items]
Impaired loans	$ 5	$ 108
Valuation, Fair Value Of Underlying Collateral | Measurement Input, Discount Rate | Level 3 | Nonrecurring | Minimum
Fair Value, Option, Quantitative Disclosures [Line Items]
Impaired loans, measurement input	0	0
Valuation, Fair Value Of Underlying Collateral | Measurement Input, Discount Rate | Level 3 | Nonrecurring | Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
Impaired loans, measurement input	0	1
Valuation, Fair Value Of Underlying Collateral | Measurement Input, Discount Rate | Level 3 | Nonrecurring | Weighted Average
Fair Value, Option, Quantitative Disclosures [Line Items]
Impaired loans, measurement input	0	0.3600
Valuation, Appraised Value | Level 3 | Nonrecurring
Fair Value, Option, Quantitative Disclosures [Line Items]
OREO and other Level 3 assets	$ 12	$ 16
Interest rate | Valuation Technique, Discounted Cash Flow | Level 3 | Recurring
Fair Value, Option, Quantitative Disclosures [Line Items]
Derivative assets	$ 34	$ 56
Interest rate | Valuation Technique, Discounted Cash Flow | Measurement Input, Default Rate | Level 3 | Recurring | Minimum
Fair Value, Option, Quantitative Disclosures [Line Items]
Derivative assets, measurement input	0.0002	0.0002
Interest rate | Valuation Technique, Discounted Cash Flow | Measurement Input, Default Rate | Level 3 | Recurring | Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
Derivative assets, measurement input	1	1
Interest rate | Valuation Technique, Discounted Cash Flow | Measurement Input, Default Rate | Level 3 | Recurring | Weighted Average
Fair Value, Option, Quantitative Disclosures [Line Items]
Derivative assets, measurement input	0.1660	0.0790
Interest rate | Valuation Technique, Discounted Cash Flow | Measurement Input, Internal Risk Rating | Level 3 | Recurring | Minimum
Fair Value, Option, Quantitative Disclosures [Line Items]
Derivative assets, measurement input	1	1
Interest rate | Valuation Technique, Discounted Cash Flow | Measurement Input, Internal Risk Rating | Level 3 | Recurring | Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
Derivative assets, measurement input	19	19
Interest rate | Valuation Technique, Discounted Cash Flow | Measurement Input, Internal Risk Rating | Level 3 | Recurring | Weighted Average
Fair Value, Option, Quantitative Disclosures [Line Items]
Derivative assets, measurement input	15.133	9.675
Interest rate | Valuation Technique, Discounted Cash Flow | Measurement Input, Loss Given Default | Level 3 | Recurring | Minimum
Fair Value, Option, Quantitative Disclosures [Line Items]
Derivative assets, measurement input	0	0
Interest rate | Valuation Technique, Discounted Cash Flow | Measurement Input, Loss Given Default | Level 3 | Recurring | Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
Derivative assets, measurement input	1	1
Interest rate | Valuation Technique, Discounted Cash Flow | Measurement Input, Loss Given Default | Level 3 | Recurring | Weighted Average
Fair Value, Option, Quantitative Disclosures [Line Items]
Derivative assets, measurement input	0.500	0.483
Credit | Valuation Technique, Discounted Cash Flow | Level 3 | Recurring
Fair Value, Option, Quantitative Disclosures [Line Items]
Derivative assets	$ 0	$ 1
Derivative liabilities	$ (6)	$ (11)
Credit | Valuation Technique, Discounted Cash Flow | Measurement Input, Default Rate | Level 3 | Recurring | Minimum
Fair Value, Option, Quantitative Disclosures [Line Items]
Derivative assets, measurement input	0.0002	0.0002
Derivative liabilities, measurement input	0.0002	0.0002
Credit | Valuation Technique, Discounted Cash Flow | Measurement Input, Default Rate | Level 3 | Recurring | Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
Derivative assets, measurement input	1	1
Derivative liabilities, measurement input	1	1
Credit | Valuation Technique, Discounted Cash Flow | Measurement Input, Default Rate | Level 3 | Recurring | Weighted Average
Fair Value, Option, Quantitative Disclosures [Line Items]
Derivative assets, measurement input	0.0310	0.0470
Derivative liabilities, measurement input	0.1491	0.1545
Credit | Valuation Technique, Discounted Cash Flow | Measurement Input, Internal Risk Rating | Level 3 | Recurring | Minimum
Fair Value, Option, Quantitative Disclosures [Line Items]
Derivative assets, measurement input	1	1
Derivative liabilities, measurement input	1	1
Credit | Valuation Technique, Discounted Cash Flow | Measurement Input, Internal Risk Rating | Level 3 | Recurring | Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
Derivative assets, measurement input	19	19
Derivative liabilities, measurement input	19	19
Credit | Valuation Technique, Discounted Cash Flow | Measurement Input, Internal Risk Rating | Level 3 | Recurring | Weighted Average
Fair Value, Option, Quantitative Disclosures [Line Items]
Derivative assets, measurement input	9.024	10.478
Derivative liabilities, measurement input	8.197	8.555
Credit | Valuation Technique, Discounted Cash Flow | Measurement Input, Loss Given Default | Level 3 | Recurring | Minimum
Fair Value, Option, Quantitative Disclosures [Line Items]
Derivative assets, measurement input	0	0
Derivative liabilities, measurement input	0	0
Credit | Valuation Technique, Discounted Cash Flow | Measurement Input, Loss Given Default | Level 3 | Recurring | Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
Derivative assets, measurement input	1	1
Derivative liabilities, measurement input	1	1
Credit | Valuation Technique, Discounted Cash Flow | Measurement Input, Loss Given Default | Level 3 | Recurring | Weighted Average
Fair Value, Option, Quantitative Disclosures [Line Items]
Derivative assets, measurement input	0.498	0.490
Derivative liabilities, measurement input	0.422	0.431
Other | Valuation Technique, Discounted Cash Flow | Level 3 | Recurring
Fair Value, Option, Quantitative Disclosures [Line Items]
Derivative assets	$ 6	$ 32
Other | Valuation Technique, Discounted Cash Flow | Measurement Input, Loan Closing Rates | Level 3 | Recurring | Minimum
Fair Value, Option, Quantitative Disclosures [Line Items]
Derivative assets, measurement input	0.0590	0.3695
Other | Valuation Technique, Discounted Cash Flow | Measurement Input, Loan Closing Rates | Level 3 | Recurring | Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
Derivative assets, measurement input	0.9970	0.9968
Other | Valuation Technique, Discounted Cash Flow | Measurement Input, Loan Closing Rates | Level 3 | Recurring | Weighted Average
Fair Value, Option, Quantitative Disclosures [Line Items]
Derivative assets, measurement input	0.8517	0.7751
Other securities | Recurring
Fair Value, Option, Quantitative Disclosures [Line Items]
Securities available for sale	$ 23	$ 13
Other securities | Level 3 | Recurring
Fair Value, Option, Quantitative Disclosures [Line Items]
Securities available for sale	22	13
Other securities | Valuation Technique, Discounted Cash Flow | Level 3 | Recurring
Fair Value, Option, Quantitative Disclosures [Line Items]
Securities available for sale	22	13
Principal investments, Direct | Recurring
Fair Value, Option, Quantitative Disclosures [Line Items]
Other investments	1	1
Principal investments, Direct | Level 3 | Recurring
Fair Value, Option, Quantitative Disclosures [Line Items]
Other investments	$ 1	$ 1

Fair Value Measurements - Fai_3

Fair Value Measurements - Fair Value Disclosures of Financial Instruments (Details) - USD ($) $ in Millions		Sep. 30, 2021	Dec. 31, 2020
ASSETS
Trading account assets		$ 902	$ 735
Derivative assets		2,553	1,798
Securities available for sale		40,594	27,556
Amortized cost		8,423	7,595
Held-to-maturity securities		8,664	8,023
Loans, net of unearned income (residential)		98,609	101,185
Loans held for sale	[1]	1,805	1,583
LIABILITIES
Long-term debt		13,165	13,709
Carrying Amount
ASSETS
Trading account assets		902	735
Other investments		607	621
Loans, net of unearned income (residential)		10	11
Loans held for sale		237	264
Securities available for sale		40,594	27,556
Amortized cost		8,423	7,595
Loans, net of unearned income (residential)		97,515	99,548
Loans held for sale		1,568	1,319
Short-term investments			0
Cash and short-term investments		20,371	17,285
LIABILITIES
Time deposits		4,205	5,743
Short-term borrowings		995	979
Long-term debt		13,165	13,709
Deposits with no stated maturity		147,726	129,539
Fair Value
ASSETS
Trading account assets		902	735
Other investments		607	621
Loans, net of unearned income (residential)		10	11
Loans held for sale		237	264
Securities available for sale		40,594	27,556
Held-to-maturity securities		8,664	8,023
Loans, net of unearned income (residential)		97,435	98,946
Loans held for sale		1,568	1,319
Short-term investments			0
Cash and short-term investments		20,371	17,285
LIABILITIES
Time deposits		4,214	5,765
Short-term borrowings		995	979
Long-term debt		13,792	14,659
Deposits with no stated maturity		147,726	129,539
Level 1 | Fair Value
ASSETS
Trading account assets		17	0
Other investments		0	0
Loans, net of unearned income (residential)		0	0
Loans held for sale		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
Short-term investments			0
Cash and short-term investments		20,371	17,285
LIABILITIES
Time deposits		0	0
Short-term borrowings		212	256
Long-term debt		13,076	13,925
Deposits with no stated maturity		0	0
Level 2 | Fair Value
ASSETS
Trading account assets		885	735
Other investments		0	0
Loans, net of unearned income (residential)		0	0
Loans held for sale		237	264
Securities available for sale		40,572	27,543
Held-to-maturity securities		8,664	8,023
Loans, net of unearned income (residential)		0	0
Loans held for sale		0	0
Short-term investments			0
Cash and short-term investments		0	0
LIABILITIES
Time deposits		4,214	5,765
Short-term borrowings		783	723
Long-term debt		716	734
Deposits with no stated maturity		147,726	129,539
Level 3 | Fair Value
ASSETS
Trading account assets		0	0
Other investments		537	555
Loans, net of unearned income (residential)		10	11
Loans held for sale		0	0
Securities available for sale		22	13
Held-to-maturity securities		0	0
Loans, net of unearned income (residential)		97,435	98,946
Loans held for sale		1,568	1,319
Short-term investments			0
Cash and short-term investments		0	0
LIABILITIES
Time deposits		0	0
Short-term borrowings		0	0
Long-term debt		0	0
Deposits with no stated maturity		0	0
Measured at NAV | Fair Value
ASSETS
Other investments		70	66
Derivatives Not Designated as Hedging Instruments | Carrying Amount
ASSETS
Derivative assets		2,469	1,676
LIABILITIES
Derivative liabilities		249	154
Derivatives Not Designated as Hedging Instruments | Fair Value
ASSETS
Derivative assets		2,469	1,675
Derivative assets, Netting Adjustment		(342)	(433)
LIABILITIES
Derivative liabilities		249	154
Derivative liabilities, Netting Adjustment		(1,911)	(675)
Derivatives Not Designated as Hedging Instruments | Level 1 | Fair Value
ASSETS
Derivative assets		65	78
LIABILITIES
Derivative liabilities		60	72
Derivatives Not Designated as Hedging Instruments | Level 2 | Fair Value
ASSETS
Derivative assets		2,739	1,939
LIABILITIES
Derivative liabilities		2,093	746
Derivatives Not Designated as Hedging Instruments | Level 3 | Fair Value
ASSETS
Derivative assets		7	91
LIABILITIES
Derivative liabilities		7	11
Derivatives Designated as Hedging Instruments | Carrying Amount
ASSETS
Derivative assets		84	123
LIABILITIES
Derivative liabilities		11	(3)
Derivatives Designated as Hedging Instruments | Fair Value
ASSETS
Derivative assets		84	123
Derivative assets, Netting Adjustment		39	53
LIABILITIES
Derivative liabilities		11	(3)
Derivative liabilities, Netting Adjustment		0	0
Derivatives Designated as Hedging Instruments | Level 1 | Fair Value
ASSETS
Derivative assets		0	0
LIABILITIES
Derivative liabilities		0	0
Derivatives Designated as Hedging Instruments | Level 2 | Fair Value
ASSETS
Derivative assets		45	70
LIABILITIES
Derivative liabilities		11	(3)
Derivatives Designated as Hedging Instruments | Level 3 | Fair Value
ASSETS
Derivative assets		0	0
LIABILITIES
Derivative liabilities		$ 0	$ 0
[1]	Total loans held for sale include real estate — residential mortgage loans held for sale at fair value of $237 million at September 30, 2021, and $264 million at December 31, 2020.

Securities - Details of Securit

Securities - Details of Securities (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
SECURITIES AVAILABLE FOR SALE
Amortized Cost	$ 40,661	$ 26,810
Gross Unrealized Gains	487	804
Gross Unrealized Losses	554	58
Fair Value	40,594	27,556
HELD-TO-MATURITY SECURITIES
Amortized Cost	8,423	7,595
Gross Unrealized Gains	241	428
Gross Unrealized Losses	0	0
Fair Value	8,664	8,023
Accrued interest	211	241
U.S. Treasury, agencies and corporations
SECURITIES AVAILABLE FOR SALE
Amortized Cost	8,960	1,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	22	0
Fair Value	8,938	1,000
Agency residential collateralized mortgage obligations
SECURITIES AVAILABLE FOR SALE
Amortized Cost	16,143	14,001
Gross Unrealized Gains	168	297
Gross Unrealized Losses	207	25
Fair Value	16,104	14,273
HELD-TO-MATURITY SECURITIES
Amortized Cost	2,485	3,775
Gross Unrealized Gains	69	124
Gross Unrealized Losses	0	0
Fair Value	2,554	3,899
Agency residential mortgage-backed securities
SECURITIES AVAILABLE FOR SALE
Amortized Cost	5,409	2,094
Gross Unrealized Gains	51	70
Gross Unrealized Losses	52	0
Fair Value	5,408	2,164
HELD-TO-MATURITY SECURITIES
Amortized Cost	184	271
Gross Unrealized Gains	7	14
Gross Unrealized Losses	0	0
Fair Value	191	285
Asset-backed securities (c)
HELD-TO-MATURITY SECURITIES
Amortized Cost	2,837	19
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	2,837	19
Asset-backed securities (c) | Senior Notes
HELD-TO-MATURITY SECURITIES
Amortized Cost	2,800
Other securities
SECURITIES AVAILABLE FOR SALE
Amortized Cost	8	8
Gross Unrealized Gains	15	5
Gross Unrealized Losses		0
Fair Value	23	13
HELD-TO-MATURITY SECURITIES
Amortized Cost	16	15
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	16	15
Mortgage-backed securities | Agency commercial mortgage-backed securities
SECURITIES AVAILABLE FOR SALE
Amortized Cost	10,141	9,707
Gross Unrealized Gains	253	432
Gross Unrealized Losses	273	33
Fair Value	10,121	10,106
HELD-TO-MATURITY SECURITIES
Amortized Cost	2,901	3,515
Gross Unrealized Gains	165	290
Gross Unrealized Losses	0	0
Fair Value	3,066	3,805
Securities available for sale
HELD-TO-MATURITY SECURITIES
Accrued interest	53	42
Securities held-to-maturity
HELD-TO-MATURITY SECURITIES
Accrued interest	$ 15	$ 15

Securities - Available for Sale

Securities - Available for Sale Securities (Unrealized Loss Position) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Held-to-maturity securities:
Temporarily impaired securities, fair value, less than 12 months	$ 32,884	$ 4,830
Temporarily impaired securities, gross unrealized losses, less than 12 months	439	58
Temporarily impaired securities, fair value, 12 months or longer	1,968	29
Temporarily impaired securities, gross unrealized losses, 12 months or longer	115	0
Temporarily impaired securities, fair value	34,852	4,859
Temporarily impaired securities, gross unrealized losses	554	58
U.S. Treasury, agencies and corporations
Securities available for sale:
Fair value, less than 12 months	8,938
Gross unrealized losses, less than 12 months	22
Fair value, 12 months or longer	0
Gross unrealized losses, 12 months or longer	0
Fair value	8,938
Gross unrealized losses	22
Agency residential collateralized mortgage obligations
Securities available for sale:
Fair value, less than 12 months	7,647	2,110
Gross unrealized losses, less than 12 months	150	25
Fair value, 12 months or longer	868	0
Gross unrealized losses, 12 months or longer	57	0
Fair value	8,515	2,110
Gross unrealized losses	207	25
Held-to-maturity securities:
Fair value, less than 12 months		0
Gross unrealized losses, less than 12 months		0
Fair value, 12 months or longer		24
Gross unrealized losses, 12 months or longer		0
Fair value		24
Gross unrealized losses		0
Agency residential collateralized mortgage obligations | Maximum
Securities available for sale:
Gross unrealized losses, 12 months or longer		1
Agency commercial mortgage-backed securities
Securities available for sale:
Fair value, less than 12 months	4,219	2,709
Gross unrealized losses, less than 12 months	215	33
Fair value, 12 months or longer	1,093	0
Gross unrealized losses, 12 months or longer	58	0
Fair value	5,312	2,709
Gross unrealized losses	273	33
Asset-backed securities (c)
Held-to-maturity securities:
Fair value, less than 12 months	1
Gross unrealized losses, less than 12 months	0
Fair value, 12 months or longer	1
Gross unrealized losses, 12 months or longer	0
Fair value	2
Gross unrealized losses	0
Asset-backed securities (c) | Maximum
Held-to-maturity securities:
Gross unrealized losses	1
Other securities
Held-to-maturity securities:
Fair value, less than 12 months	8,460	5
Gross unrealized losses, less than 12 months	0	0
Fair value, 12 months or longer	0	0
Gross unrealized losses, 12 months or longer	0	0
Fair value	8,460	5
Gross unrealized losses	0	0
Other securities | Maximum
Held-to-maturity securities:
Gross unrealized losses, less than 12 months		1
Mortgage-backed securities | Agency residential mortgage-backed securities
Securities available for sale:
Fair value, less than 12 months	3,619	6
Gross unrealized losses, less than 12 months	52	0
Fair value, 12 months or longer	6	5
Gross unrealized losses, 12 months or longer	0	0
Fair value	3,625	11
Gross unrealized losses	$ 52	0
Mortgage-backed securities | Agency residential mortgage-backed securities | Maximum
Securities available for sale:
Gross unrealized losses, less than 12 months		1
Gross unrealized losses, 12 months or longer		$ 1

Securities - Additional Informa

Securities - Additional Information (Details) $ in Billions	Sep. 30, 2021USD ($)
Investments, Debt and Equity Securities [Abstract]
Loans pledged as collateral	$ 14.7

Securities - Securities by Matu

Securities - Securities by Maturity (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Amortized Cost of Securities Available for sale, Due in one year or less	$ 230
Amortized Cost of Securities Available for sale, Due after one through five years	19,818
Amortized Cost of Securities Available for sale, Due after five through ten years	17,312
Amortized Cost of Securities Available for sale, Due after ten years	3,301
Amortized Cost	40,661
Fair Value of Securities Available for sale, Due in one year or less	247
Fair Value of Securities Available for sale, Due after one through five years	20,076
Fair Value of Securities Available for sale, Due after five through ten years	17,128
Fair Value of Securities Available for sale, Due after ten years	3,143
Fair Value	40,594	$ 27,556
Amortized Cost of Held-to-Maturity Securities, Due in one year or less	93
Amortized Cost of Held-to-Maturity Securities, Due after one through five years	6,330
Amortized Cost of Held-to-Maturity Securities, Due after five through ten years	2,000
Amortized Cost of Held-to-Maturity Securities, Due after ten years	0
Amortized Cost	8,423	7,595
Fair Value of Held-to-Maturity Securities, Due in one year or less	95
Fair Value of Held-to-Maturity Securities, Due after one through five years	6,452
Fair Value of Held-to-Maturity Securities, Due after five through ten years	2,117
Fair Value of Held-to-Maturity Securities, Due after ten years	0
Total Fair Value of Held-to-Maturity Securities	$ 8,664	$ 8,023

Derivatives and Hedging Activ_3

Derivatives and Hedging Activities - Additional Information (Details) $ in Millions	9 Months Ended
	Sep. 30, 2021USD ($)derivativerating	Dec. 31, 2020USD ($)rating
Credit Derivatives [Line Items]
Derivative assets after effects of bilateral collateral and master netting agreements	$ 84
Derivative liabilities after effects of bilateral collateral and master netting agreements	11
Derivative assets not designated as hedging instruments after effects of bilateral collateral and master netting agreements, and a reserve for potential future losses	2,500
Derivative liabilities not designated as hedging instruments after effects of bilateral collateral and master netting agreements, and a reserve for potential future losses	249
Reclassify of after-tax net gains on derivative instruments from AOCI	$ 167
Length of time hedge in cash flow hedge	12 months
Reclassification of net losses related to terminated cash flow hedges from AOCI to income	$ 6
Maximum length of time over which forecasted transactions are hedged, years	5 years 10 months 24 days
Cash collateral netted against derivative assets	$ 49	$ 63
Collateral netted against derivative liabilities	1,600	232
Gross exposure on derivatives, after taking into account the effects of bilateral collateral and master netting agreements	159
Net exposure on derivatives, after taking into account, the effects of bilateral collateral and master netting agreements	175
Over-collateralization on derivatives to broker-dealers and banks, after the application of master netting agreements and collateral	173
Additional collateral held in the form of securities	2
Default reserve associated with uncollateralized contracts	25
Gross exposure on derivatives after taking into account effects of master netting agreements	2,500
Net exposure on derivatives with clients after application of master netting agreements collateral and related reserve	2,400
Net liability position totaled	7	$ 9
Banking Subsidiary
Credit Derivatives [Line Items]
Net liability position totaled	1,700
Derivative assets included in net liability position	194
Derivative liabilities included in net liability position	1,900
Cash and securities collateral posted	$ 1,600
Number of credit risk derivatives held | derivative	0
Banking Subsidiary | Unsecured Debt
Credit Derivatives [Line Items]
Number of ratings above noninvestment | rating	4	4
Banking Subsidiary | Maximum | Unsecured Debt
Credit Derivatives [Line Items]
Payments to terminate contracts (less than for the $1 million)	$ 4	$ 2

Derivatives and Hedging Activ_4

Derivatives and Hedging Activities - Fair Values, Volume of Activity and Gain (Loss) Information Related to Derivative Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Notional Amount	$ 135,570	$ 136,020
Derivative assets, netting adjustments	(302)	(380)
Derivative Assets, net	2,552	1,796
Derivative liabilities, netting adjustments	(1,911)	(675)
Derivative Liabilities, net	230	140
Derivatives Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Notional Amount	99,147	99,885
Derivative Assets	2,810	2,108
Derivative Liabilities	2,160	829
Interest rate | Derivatives Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Notional Amount	36,423	36,135
Derivative Assets	45	70
Derivative Liabilities	11	(3)
Interest rate | Derivatives Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Notional Amount	72,688	78,424
Derivative Assets	909	1,514
Derivative Liabilities	262	291
Foreign exchange | Derivatives Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Notional Amount	7,378	6,385
Derivative Assets	80	109
Derivative Liabilities	75	103
Commodity | Derivatives Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Notional Amount	15,090	9,702
Derivative Assets	1,799	426
Derivative Liabilities	1,805	408
Credit | Derivatives Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Notional Amount	339	423
Derivative Assets	0	1
Derivative Liabilities	7	11
Other
Derivatives, Fair Value [Line Items]
Derivative Assets	6
Other | Derivatives Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Notional Amount	3,652	4,951
Derivative Assets	22	58
Derivative Liabilities	11	16
Net derivatives
Derivatives, Fair Value [Line Items]
Notional Amount	135,570	136,020
Derivative Assets, net	2,553	1,798
Derivative Liabilities, net	260	151
Other collateral
Derivatives, Fair Value [Line Items]
Notional Amount	0	0
Derivative Assets, net	(1)	(2)
Derivative Liabilities, net	$ (30)	$ (11)

Derivatives and Hedging Activ_5

Derivatives and Hedging Activities - Cumulative Basis Adjustments on Fair Value Hedges (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Fair Value	$ 40,594	$ 27,556
Long-term debt | Interest rate
Derivatives, Fair Value [Line Items]
Carrying amount of hedged item	8,077	8,182
Hedge accounting basis adjustment	205	416
Securities available for sale | Interest rate
Derivatives, Fair Value [Line Items]
Carrying amount of hedged item	6,280	2,080
Hedge accounting basis adjustment	168	21
Fair Value	7,700	2,500
Derivatives Not Designated as Hedging Instruments | Long-term debt | Interest rate
Derivatives, Fair Value [Line Items]
Hedge accounting basis adjustment	$ (7)	$ (8)

Derivatives and Hedging Activ_6

Derivatives and Hedging Activities - Effect of Fair Value and Cash Flow Hedges on Income (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Interest expense — Long-term debt		$ (54)	$ (64)	$ (168)	$ (225)
Interest income — Loans		882	927	2,659	2,933
Interest Income - securities		135	115	398	365
Investment banking and debt placement fees		235	146	614	418
Deposits		(15)	(54)	(52)	(319)
Other income	[1]	25	28	89	(27)
Net gain (loss) on cash flow hedging relationships
Net Gains (Losses) Reclassified From OCI Into Income		77	99	250	221
Interest rate | Interest expense – long-term debt | Fair Value Hedging
Net gains (losses) on fair value hedging relationships
Recognized on hedged items		37	47	210	(252)
Recognized on derivatives designated as hedging instruments		(8)	(7)	(113)	343
Net income (expense) recognized on fair value hedges		29	40	97	91
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		(1)	(1)	(3)	(3)
Net income (expense) recognized on cash flow hedges		(1)	(1)	(3)
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		79	100	253	224
Net Gains (Losses) Reclassified From OCI Into Income		79	100	253	224
Net income (expense) recognized on cash flow hedges		79	100	253
Interest rate | Interest Income - securities | Fair Value Hedging
Net gains (losses) on fair value hedging relationships
Recognized on hedged items		(38)	0	(147)	0
Recognized on derivatives designated as hedging instruments		39	0	147	0
Net income (expense) recognized on fair value hedges		1	0	0	0
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
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					0
Net income (expense) recognized on cash flow hedges		(1)	0	0
Interest rate | Interest expense - deposits | Fair Value Hedging
Net gains (losses) on fair value hedging relationships
Recognized on hedged items			0	0	0
Recognized on derivatives designated as hedging instruments			0	0	0
Net income (expense) recognized on fair value hedges			0	0	0
Interest rate | Interest expense - deposits | 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
Interest rate | Other income | 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 | Other income | 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
Interest rate | Investment banking and debt placement fees | Cash Flow Hedging
Net gain (loss) on cash flow hedging relationships
Net Gains (Losses) Reclassified From OCI Into Income		$ (1)	$ 0	$ 0	$ 0
[1]	For the three and nine months ended September 30, 2021, net securities gains (losses) totaled less than $1 million. For the three months ended September 30, 2021 and September 30, 2020, we did not have any impairment losses related to securities. For the three months ended September 30, 2020, we had no net securities gains (losses). For the nine months ended September 30, 2020, net securities gains (losses) totaled $4 million.

Derivatives and Hedging Activ_7

Derivatives and Hedging Activities - Derivative Instrument Cash Flow Hedge Earning Recognized by Income Statement Location (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Derivatives, Fair Value [Line Items]
Net Gains (Losses) Recognized in OCI	$ 2	$ 15	$ (133)	$ 613
Net Gains (Losses) Reclassified From OCI Into Income	77	99	250	221
Interest income – loans | Interest rate | Cash Flow Hedges
Derivatives, Fair Value [Line Items]
Net Gains (Losses) Recognized in OCI	(2)	5	(144)	629
Net Gains (Losses) Reclassified From OCI Into Income	79	100	253	224
Interest expense — Long-term debt | Interest rate | Cash Flow Hedges
Derivatives, Fair Value [Line Items]
Net Gains (Losses) Recognized in OCI	0	0	2	(6)
Net Gains (Losses) Reclassified From OCI Into Income	(1)	(1)	(3)	(3)
Investment banking and debt placement fees | Interest rate | Cash Flow Hedges
Derivatives, Fair Value [Line Items]
Net Gains (Losses) Recognized in OCI	4	10	9	(10)
Net Gains (Losses) Reclassified From OCI Into Income	$ (1)	$ 0	0	0
Other income | Foreign exchange | Net Investment Hedges
Derivatives, Fair Value [Line Items]
Net Gains (Losses) Recognized in OCI			0	0
Net Gains (Losses) Reclassified From OCI Into Income			$ 0	$ 0

Derivatives and Hedging Activ_8

Derivatives and Hedging Activities - Pre-Tax Net Gains (Losses) on Derivatives Not Designated as Hedging Instruments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	$ 16	$ 34	$ 35	$ 82
Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	8	4	20	13
Foreign exchange
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	12	9	34	29
Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	4	5	12	13
Credit
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	(8)	(4)	(22)	(26)
Other
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	0	20	(9)	53
Corporate services income
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	25	23	70	59
Corporate services income | Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	8	5	19	23
Corporate services income | Foreign exchange
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	12	9	34	29
Corporate services income | Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	4	5	12	13
Corporate services income | Credit
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	1	4	5	(6)
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	28	13	36
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	28	13	36
Other income
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	(9)	(17)	(48)	(13)
Other income | Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	0	(1)	1	(10)
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)	(9)	(8)	(27)	(20)
Other income | Other
Derivative Instruments, Gain (Loss) [Line Items]
Total net gains (losses)	$ 0	$ (8)	$ (22)	$ 17

Derivatives and Hedging Activ_9

Derivatives and Hedging Activities - Fair Value of Derivative Assets by Type (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Credit Derivatives [Line Items]
Derivative assets before collateral	$ 2,504	$ 1,735
Plus(Less): Related collateral	49	63
Total derivative assets	2,553	1,798
Interest rate
Credit Derivatives [Line Items]
Derivative assets before collateral	838	1,448
Foreign exchange
Credit Derivatives [Line Items]
Derivative assets before collateral	38	52
Commodity
Credit Derivatives [Line Items]
Derivative assets before collateral	1,606	178
Credit
Credit Derivatives [Line Items]
Derivative assets before collateral	0	(1)
Other
Credit Derivatives [Line Items]
Derivative assets before collateral	$ 22	$ 58

Derivatives and Hedging Acti_10

Derivatives and Hedging Activities - Credit Derivatives Sold and Held (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Credit Derivatives [Line Items]
Notional Amount	$ 146	$ 227
Payment / Performance Risk	0.00%	0.00%
Other
Credit Derivatives [Line Items]
Notional Amount	$ 146	$ 227
Average Term (Years)	13 years 14 days	12 years 9 months 3 days
Payment / Performance Risk	17.88%	19.53%

Derivatives and Hedging Acti_11

Derivatives and Hedging Activities - Credit Risk Contingent Feature (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Credit Derivatives [Line Items]
Additional collateral aggregate fair value	$ 2
Standard & Poor's, A- Rating | One rating downgrade
Credit Derivatives [Line Items]
Additional collateral aggregate fair value	2	$ 1
Standard & Poor's, A- Rating | Two rating downgrades
Credit Derivatives [Line Items]
Additional collateral aggregate fair value	3	1
Standard & Poor's, A- Rating | Three rating downgrades
Credit Derivatives [Line Items]
Additional collateral aggregate fair value	3	1
Moody's, A3 Rating | One rating downgrade
Credit Derivatives [Line Items]
Additional collateral aggregate fair value	2	1
Moody's, A3 Rating | Two rating downgrades
Credit Derivatives [Line Items]
Additional collateral aggregate fair value	3	1
Moody's, A3 Rating | Three rating downgrades
Credit Derivatives [Line Items]
Additional collateral aggregate fair value	$ 3	$ 1

Mortgage Servicing Assets - Cha

Mortgage Servicing Assets - Changes in Carrying Amount of Mortgage Servicing Assets (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Commercial Mortgage Backed Securities
Servicing Asset at Amortized Cost, Balance [Roll Forward]
Balance at beginning of period	$ 600	$ 565	$ 578	$ 539
Servicing retained from loan sales	31	30	88	107
Purchases	8	6	22	24
Amortization	(30)	(29)	(89)	(88)
Temporary (impairments) recoveries	0	(6)	10	(16)
Balance at end of period	609	566	609	566
Fair value at end of period	735	685	735	685
Agency residential mortgage-backed securities
Servicing Asset at Amortized Cost, Balance [Roll Forward]
Balance at beginning of period	77	46	58	46
Servicing retained from loan sales	9	12	32	25
Purchases	0	0	0	0
Amortization	(4)	(4)	(14)	(9)
Temporary (impairments) recoveries	3	(1)	9	(9)
Balance at end of period	85	53	85	53
Fair value at end of period	$ 89	$ 54	$ 89	$ 54

Mortgage Servicing Assets - Sch

Mortgage Servicing Assets - Schedule of Range and Weighted-Average of Significant Unobservable Inputs (Details) - Discounted cash flow - USD ($)	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Commercial Mortgage Backed Securities | Minimum
Servicing Assets at Fair Value [Line Items]
Expected defaults	1.00%	1.00%
Discount rate	7.64%	7.72%
Escrow earn rate	1.04%	0.92%
Loan assumption rate	0.00%	0.00%
Commercial Mortgage Backed Securities | Maximum
Servicing Assets at Fair Value [Line Items]
Expected defaults	2.00%	2.00%
Discount rate	10.49%	10.66%
Escrow earn rate	1.37%	1.16%
Loan assumption rate	1.71%	1.78%
Commercial Mortgage Backed Securities | Weighted Average
Servicing Assets at Fair Value [Line Items]
Expected defaults	1.15%	1.17%
Discount rate	9.31%	9.30%
Escrow earn rate	1.04%	1.05%
Loan assumption rate	1.40%	1.39%
Agency residential mortgage-backed securities | Minimum
Servicing Assets at Fair Value [Line Items]
Discount rate	7.50%	7.51%
Servicing cost	$ 62	$ 62
Prepayment speed	8.03%	12.35%
Agency residential mortgage-backed securities | Maximum
Servicing Assets at Fair Value [Line Items]
Discount rate	8.57%	8.80%
Servicing cost	$ 4,375	$ 5,125
Prepayment speed	48.88%	53.36%
Agency residential mortgage-backed securities | Weighted Average
Servicing Assets at Fair Value [Line Items]
Discount rate	7.54%	7.57%
Servicing cost	$ 68.15	$ 81.67
Prepayment speed	11.67%	16.89%

Mortgage Servicing Assets - Add

Mortgage Servicing Assets - Additional Information (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Commercial Mortgage Backed Securities
Servicing Assets at Fair Value [Line Items]
Contractual fee income from servicing commercial mortgage loans	$ 193	$ 154
Amortization of servicing commercial mortgage loans	89	88
Residential mortgage-backed securities
Servicing Assets at Fair Value [Line Items]
Contractual fee income from servicing commercial mortgage loans	30	24
Amortization of servicing commercial mortgage loans	$ 14	$ 9

Leases - Components of Equipmen

Leases - Components of Equipment Leasing Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Sales-type and direct financing leases
Interest income on lease receivable	$ 13	$ 36	$ 59	$ 91
Interest income related to accretion of unguaranteed residual asset	9	(7)	12	(1)
Total sales-type and direct financing lease income	22	29	71	90
Operating leases
Operating lease income related to lease payments	31	34	95	103
Other operating leasing gains	6	4	16	25
Total operating lease income and other leasing gains	36	38	111	128
Total lease income	$ 58	$ 67	$ 182	$ 218

Goodwill (Details)

Goodwill (Details) $ in Millions	9 Months Ended
	Sep. 30, 2021USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 2,664
AQN Strategies acquisition	9
Ending balance	2,673
Consumer Bank
Goodwill [Roll Forward]
Beginning balance	1,752
AQN Strategies acquisition	9
Ending balance	1,761
Commercial Bank
Goodwill [Roll Forward]
Beginning balance	912
AQN Strategies acquisition	0
Ending balance	$ 912

Variable Interest Entities - Ad

Variable Interest Entities - Additional Information (Details) - USD ($)	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Variable Interest Entity [Line Items]
VIE, assets that can only be used to settle obligations	$ 187,035,000,000		$ 170,336,000,000
VIE, liabilities	169,525,000,000		152,355,000,000
Recurring
Variable Interest Entity [Line Items]
Other investments	80,000,000		81,000,000
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
VIE, assets that can only be used to settle obligations	3,166,000,000		351,000,000
VIE, liabilities	1,000,000		1,000,000
Tax credit of investment		$ 135,000,000
Variable Interest Entity, Not Primary Beneficiary | Qualified affordable housing projects investment
Variable Interest Entity [Line Items]
VIE, liabilities	608,000,000		484,000,000
Variable Interest Entity, Not Primary Beneficiary | Other Unconsolidated Variable Interest Entities
Variable Interest Entity [Line Items]
Other investments	2,800,000,000
Variable Interest Entity, Not Primary Beneficiary | Accrued Income And Other Assets
Variable Interest Entity [Line Items]
VIE, assets that can only be used to settle obligations	1,500,000,000		1,400,000,000
Variable Interest Entity, Not Primary Beneficiary | Investments
Variable Interest Entity [Line Items]
Amortization of investment	147,000,000	$ 137,000,000
Tax credit of investment	139,000,000
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 | Principal Investments, Indirect
Variable Interest Entity [Line Items]
Other investments	$ 48,000,000		$ 53,000,000

Variable Interest Entities - Su

Variable Interest Entities - Summary of Variable Interest Entities Information (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Variable Interest Entity [Line Items]
Total Assets	$ 187,035	$ 170,336
Total Liabilities	169,525	152,355
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Total Assets	3,166	351
Total Liabilities	1	1
Variable Interest Entity, Not Primary Beneficiary | LIHTC investments
Variable Interest Entity [Line Items]
Total Assets	7,389	6,914
Total Liabilities	2,861	2,765
Maximum Exposure to Loss	1,882	1,823
Variable Interest Entity, Not Primary Beneficiary | Principal Investments, Indirect
Variable Interest Entity [Line Items]
Total Assets	10,199	10,899
Total Liabilities	189	168
Maximum Exposure to Loss	$ 61	$ 78

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Dec. 31, 2020
Income Tax Contingency [Line Items]
Total income tax expense (benefit), rate	20.40%	12.50%
Combined federal and state statutory tax rate			23.70%
Valuation allowance	$ 12		$ 12	$ 0
Accrued Income And Other Assets
Income Tax Contingency [Line Items]
Net deferred tax assets	41		41
Accrued Liabilities and Other Liabilities
Income Tax Contingency [Line Items]
Net deferred tax liability				$ 100
Key Corp
Income Tax Contingency [Line Items]
Unrecognized tax benefits	55		55
First Niagara Bank, N.A.
Income Tax Contingency [Line Items]
Allocated bad debt deductions	$ 92		$ 92

Acquisitions and Discontinued_2

Acquisitions and Discontinued Operations (Details) - USD ($) $ in Millions	Feb. 25, 2021	Sep. 30, 2021	Dec. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
AQN Strategies acquisition		$ 9
Discontinued Operations | Government Guaranteed Loans
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loans included in divestiture		$ 602	$ 710
Arbitria Quum Notitia, LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
AQN Strategies acquisition	$ 9

Securities Financing Activiti_3

Securities Financing Activities (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
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	(500)	(500)
Total	(500)	(500)
Repurchase agreements	(218)	(214)
Total	(218)	(214)
Federal Agency CMOs
Securities Financing Transaction [Line Items]
Assets pledged as collateral	283
Liabilities pledged as collateral	218
Gross Amount Presented in Balance Sheet
Securities Financing Transaction [Line Items]
Reverse repurchase agreements	11	6
Securities borrowed	500	500
Total	511	506
Repurchase agreements	229	220
Total	229	220
Netting Adjustments
Securities Financing Transaction [Line Items]
Reverse repurchase agreements	(11)	(6)
Securities borrowed	0	0
Total	(11)	(6)
Repurchase agreements	(11)	(6)
Total	$ (11)	$ (6)

Employee Benefits - Net Pension

Employee Benefits - Net Pension Cost (Benefit) for All Funded and Unfunded Plans (Details) - Pension Plans - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Interest cost on PBO	$ 6	$ 9	$ 18	$ 26
Expected return on plan assets	(7)	(10)	(21)	(29)
Amortization of losses	5	5	14	13
Settlement loss	7	0	7	8
Net pension cost	$ 11	$ 4	$ 18	$ 18

Trust Preferred Securities Is_3

Trust Preferred Securities Issued by Unconsolidated Subsidiaries (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Stock	$ 1,257	$ 1,257
Debentures adjustments related to financial instrument hedging	56	70
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 of Debentures, Net of Discount	$ 162
Interest Rate of Trust Preferred Securities and Debentures	0.885%
KeyCorp Capital II
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Trust Preferred Securities, Net of Discount	$ 101
Common Stock	4
Principal Amount of of Debentures, Net of Discount	$ 105
Interest Rate of Trust Preferred Securities and Debentures	6.875%
KeyCorp Capital III
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Trust Preferred Securities, Net of Discount	$ 140
Common Stock	4
Principal Amount of of Debentures, Net of Discount	$ 144
Interest Rate of Trust Preferred Securities and Debentures	7.75%
HNC Statutory Trust III
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Trust Preferred Securities, Net of Discount	$ 20
Common Stock	1
Principal Amount of of Debentures, Net of Discount	$ 21
Interest Rate of Trust Preferred Securities and Debentures	1.531%
Willow Grove Statutory Trust I
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Trust Preferred Securities, Net of Discount	$ 20
Common Stock	1
Principal Amount of of Debentures, Net of Discount	$ 21
Interest Rate of Trust Preferred Securities and Debentures	1.409%
HNC Statutory Trust IV
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Trust Preferred Securities, Net of Discount	$ 17
Common Stock	1
Principal Amount of of Debentures, Net of Discount	$ 18
Interest Rate of Trust Preferred Securities and Debentures	1.426%
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 of Debentures, Net of Discount	$ 8
Interest Rate of Trust Preferred Securities and Debentures	2.312%
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 of Debentures, Net of Discount	$ 8
Interest Rate of Trust Preferred Securities and Debentures	2.312%
Business Trusts
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Trust Preferred Securities, Net of Discount	$ 470	483
Common Stock	17	17
Principal Amount of of Debentures, Net of Discount	$ 486	$ 500
Interest Rate of Trust Preferred Securities and Debentures	4.343%	4.464%
Treasury Rate | KeyCorp Capital II
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Basis spread on variable rate	0.20%
Treasury Rate | KeyCorp Capital III
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Basis spread on variable rate	0.25%
London Interbank Offered Rate (LIBOR) | KeyCorp Capital I
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Basis spread on variable rate	0.74%
London Interbank Offered Rate (LIBOR) | HNC Statutory Trust III
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Basis spread on variable rate	1.40%
London Interbank Offered Rate (LIBOR) | Willow Grove Statutory Trust I
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Basis spread on variable rate	1.31%
London Interbank Offered Rate (LIBOR) | HNC Statutory Trust IV
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Basis spread on variable rate	1.28%
London Interbank Offered Rate (LIBOR) | Westbank Capital Trust II and III
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Basis spread on variable rate	2.19%
Redemption upon either tax or a capital treatment event | Treasury Rate | Keycorp Capital II and III
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Basis spread on variable rate	0.50%

Contingent Liabilities and Gu_3

Contingent Liabilities and Guarantees - Guarantees (Details) $ in Millions	Sep. 30, 2021USD ($)
Guarantor Obligations [Line Items]
Maximum Potential Undiscounted Future Payments	$ 16,542
Liability Recorded	179
Written put options
Guarantor Obligations [Line Items]
Maximum Potential Undiscounted Future Payments	3,835
Liability Recorded	57
Standby letters of credit
Guarantor Obligations [Line Items]
Maximum Potential Undiscounted Future Payments	3,463
Liability Recorded	83
Recourse agreement with FNMA
Guarantor Obligations [Line Items]
Maximum Potential Undiscounted Future Payments	6,272
Liability Recorded	25
Residential mortgage reserve
Guarantor Obligations [Line Items]
Maximum Potential Undiscounted Future Payments	2,972
Liability Recorded	$ 14

Contingent Liabilities and Gu_4

Contingent Liabilities and Guarantees - Additional Information (Details) $ in Millions	9 Months Ended
	Sep. 30, 2021USD ($)
Written put options
Commitments Contingencies And Guarantees [Line Items]
Weighted average life of written put options	2 years 1 month 6 days
Standby letters of credit
Commitments Contingencies And Guarantees [Line Items]
Remaining weighted-average life of standby letters of credit in years	1 year 8 months 12 days
Recourse agreement with FNMA
Commitments Contingencies And Guarantees [Line Items]
Weighted-average remaining term for outstanding commercial mortgage loans in years	7 years 8 months 12 days
Unpaid principal balance outstanding of loans sold	$ 20,600
Maximum potential amount of undiscounted future payments possibly required as percentage of principal balance of loans outstanding	30.50%
Residential mortgage reserve
Commitments Contingencies And Guarantees [Line Items]
Unpaid principal balance outstanding of loans sold	$ 9,700
Maximum potential amount of undiscounted future payments possibly required as percentage of principal balance of loans outstanding	30.00%
Liability for estimated repurchase obligations on loans sold	$ 14
Minimum | Standby letters of credit
Commitments Contingencies And Guarantees [Line Items]
Remaining actual life of standby letters of credit	1 year
Minimum | Low
Commitments Contingencies And Guarantees [Line Items]
Guarantee obligations, percentage	0.00%
Minimum | Moderate
Commitments Contingencies And Guarantees [Line Items]
Guarantee obligations, percentage	30.00%
Minimum | High
Commitments Contingencies And Guarantees [Line Items]
Guarantee obligations, percentage	70.00%
Maximum | Standby letters of credit
Commitments Contingencies And Guarantees [Line Items]
Remaining actual life of standby letters of credit	13 years 2 months 12 days
Maximum | Low
Commitments Contingencies And Guarantees [Line Items]
Guarantee obligations, percentage	30.00%
Maximum | Moderate
Commitments Contingencies And Guarantees [Line Items]
Guarantee obligations, percentage	70.00%

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income - Changes in AOCI (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 17,941	$ 17,542	$ 17,981	$ 17,038
Other comprehensive income before reclassification, net of income taxes	(145)	2	(608)	996
Amounts reclassified from AOCI, net of income taxes	(50)	(71)	(175)	(155)
Total other comprehensive income (loss), net of tax	(195)	(69)	(783)	841
Ending balance	17,510	17,722	17,510	17,722
Unrealized gains (losses) on securities available for sale
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	124	650	567	115
Other comprehensive income before reclassification, net of income taxes	(174)	(8)	(617)	530
Amounts reclassified from AOCI, net of income taxes	0	0	0	(3)
Total other comprehensive income (loss), net of tax	(174)	(8)	(617)	527
Ending balance	(50)	642	(50)	642
Unrealized gains (losses) on derivative financial instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	325	613	476	250
Other comprehensive income before reclassification, net of income taxes	30	11	11	467
Amounts reclassified from AOCI, net of income taxes	(59)	(75)	(191)	(168)
Total other comprehensive income (loss), net of tax	(29)	(64)	(180)	299
Ending balance	296	549	296	549
Net pension and postretirement benefit costs
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(299)	(327)	(305)	(339)
Other comprehensive income before reclassification, net of income taxes	(1)	(1)	(2)	(1)
Amounts reclassified from AOCI, net of income taxes	9	4	16	16
Total other comprehensive income (loss), net of tax	8	3	14	15
Ending balance	(291)	(324)	(291)	(324)
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	150	936	738	26
Total other comprehensive income (loss), net of tax	(195)	(69)	(783)	841
Ending balance	$ (45)	$ 867	$ (45)	$ 867

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Income - Reclassifications Out of AOCI (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income — Loans		$ 882	$ 927	$ 2,659	$ 2,933
Other income	[1]	25	28	89	(27)
Income taxes		165	60	501	113
Interest expense — Long-term debt		(54)	(64)	(168)	(225)
Investment banking and debt placement fees		235	146	614	418
Other expense		640	588	1,887	1,675
INCOME (LOSS) FROM CONTINUING OPERATIONS		643	424	1,985	754
Reclassification out of Accumulated Other Comprehensive Income | Realized gains on available for sale securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income				0	4
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				0	4
Income taxes				0	1
INCOME (LOSS) FROM CONTINUING OPERATIONS				0	3
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		77	99	250	221
Income taxes		18	24	59	53
Investment banking and debt placement fees		(1)	0	0	0
INCOME (LOSS) FROM CONTINUING OPERATIONS		59	75	191	168
Reclassification out of Accumulated Other Comprehensive Income | Amortization of losses
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other expense		(5)	(5)	(14)	(13)
Reclassification out of Accumulated Other Comprehensive Income | Settlement loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other expense		(7)	0	(7)	(8)
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		(12)	(5)	(21)	(21)
Income taxes		(3)	(1)	(5)	(5)
INCOME (LOSS) FROM CONTINUING OPERATIONS		(9)	(4)	(16)	(16)
Interest income – loans | Reclassification out of Accumulated Other Comprehensive Income | Unrealized gains (losses) on derivative financial instruments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income — Loans		79	100	253	224
Interest expense — Long-term debt | Reclassification out of Accumulated Other Comprehensive Income | Unrealized gains (losses) on derivative financial instruments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense — Long-term debt		$ (1)	$ (1)	$ (3)	$ (3)
[1]	For the three and nine months ended September 30, 2021, net securities gains (losses) totaled less than $1 million. For the three months ended September 30, 2021 and September 30, 2020, we did not have any impairment losses related to securities. For the three months ended September 30, 2020, we had no net securities gains (losses). For the nine months ended September 30, 2020, net securities gains (losses) totaled $4 million.

Shareholders' Equity - Comprehe

Shareholders' Equity - Comprehensive Capital Plan (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	Sep. 10, 2021	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common stock repurchased during period		$ 125		$ 0	$ 559	$ 117
Initial shares received under accelerated share repurchase program (in shares)	23.6
Cash payment	$ 585
Accelerated share repurchase program, current market price (in dollars per share)	$ 19.87
Cash dividends declared on Common Shares (in usd per share)		$ 0.185		$ 0.185	$ 0.555	$ 0.555
2021 Capital Plan
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common stock repurchased during period			$ 593
Reduction to capital surplus for accelerated repurchase program		$ (117)
Cash dividends declared on Common Shares (in usd per share)		$ 0.185
Initial Settlement of Accelerated Share Repurchase Program
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common stock repurchased during period			468
Open Market Purchases
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common stock repurchased during period			125
Employee Equity Compensation Programs | Maximum
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common stock repurchased during period			$ 1

Shareholders' Equity - Schedule

Shareholders' Equity - Schedule of Preferred Stock (Details)	Sep. 30, 2021USD ($)$ / sharesshares
Series D Preferred Stock
Class of Stock [Line Items]
Preferred stock, amount outstanding | $	$ 525,000,000
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)	$ 1
Preferred stock, liquidation preference, value | $	$ 25,000
Depository Shares, Series D
Class of Stock [Line Items]
Depository receipt ratio	0.04
Preferred stock, liquidation preference (in usd per share)	$ 1,000
Dividend payable per share (in usd per share)	$ 12.50
Series E Preferred Stock
Class of Stock [Line Items]
Preferred stock, amount outstanding | $	$ 500,000,000
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)	$ 1
Preferred stock, liquidation preference, value | $	$ 1,000
Depository Shares, Series E
Class of Stock [Line Items]
Depository receipt ratio	0.025
Preferred stock, liquidation preference (in usd per share)	$ 25
Dividend payable per share (in usd per share)	$ 0.382813
Series F Preferred Stock
Class of Stock [Line Items]
Preferred stock, amount outstanding | $	$ 425,000,000
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)	$ 1
Preferred stock, liquidation preference, value | $	$ 1,000
Depository Shares, Series F
Class of Stock [Line Items]
Depository receipt ratio	0.025
Preferred stock, liquidation preference (in usd per share)	$ 25
Dividend payable per share (in usd per share)	$ 0.353125
Series G Preferred Stock
Class of Stock [Line Items]
Preferred stock, amount outstanding | $	$ 450,000,000
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)	$ 1
Preferred stock, liquidation preference, value | $	$ 1,000
Depository Shares, Series G
Class of Stock [Line Items]
Depository receipt ratio	0.025
Preferred stock, liquidation preference (in usd per share)	$ 25
Dividend payable per share (in usd per share)	$ 0.351563

Business Segment Reporting - Ad

Business Segment Reporting - Additional Information (Details)	Sep. 30, 2021branchsector
Consumer Bank
Segment Reporting Information [Line Items]
Number of state branch networks | branch	15
Commercial Bank
Segment Reporting Information [Line Items]
Number of industry sectors | sector	7

Business Segment Reporting - Sc

Business Segment Reporting - Schedule of Segment Reporting Information (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021USD ($)employee	Sep. 30, 2020USD ($)employee	Sep. 30, 2021USD ($)employee	Sep. 30, 2020USD ($)employee
SUMMARY OF OPERATIONS
Net interest income (TE)	$ 1,025	$ 1,006	$ 3,060	$ 3,020
Noninterest income	797	681	2,285	1,850
Total revenue (TE)	1,822	1,687	5,345	4,870
Provision for credit losses	(107)	160	(422)	1,001
Depreciation and amortization expense	87	89	267	272
Other noninterest expense	1,025	948	2,992	2,709
Income (loss) from continuing operations before income taxes (TE)	817	490	2,508	888
Allocated income taxes and TE adjustments	174	66	523	134
INCOME (LOSS) FROM CONTINUING OPERATIONS	643	424	1,985	754
Income (loss) from discontinued operations, net of taxes	2	4	11	7
NET INCOME (LOSS)	645	428	1,996	761
Less: Net income (loss) attributable to noncontrolling interests	0	0	0	0
NET INCOME (LOSS) ATTRIBUTABLE TO KEY	645	428	1,996	761
AVERAGE BALANCES
Loans and leases	100,138	104,919	100,562	103,018
Total assets	181,371	168,811	177,194	159,746
Deposits	146,916	134,944	143,023	124,455
OTHER FINANCIAL DATA
Net loan charge-offs	$ 29	$ 128	$ 165	$ 308
Return on average allocated equity, continuing operations (as a percent)	14.25%	9.51%	14.87%	5.74%
Return on average allocated equity (as a percent)	14.30%	9.60%	14.96%	5.79%
Average full-time equivalent employees | employee	17,009	17,097	17,034	16,758
Operating Segments | Consumer Bank
SUMMARY OF OPERATIONS
Net interest income (TE)	$ 582	$ 598	$ 1,788	$ 1,765
Noninterest income	288	266	798	740
Total revenue (TE)	870	864	2,586	2,505
Provision for credit losses	(38)	(3)	(132)	289
Depreciation and amortization expense	31	19	71	59
Other noninterest expense	560	548	1,706	1,597
Income (loss) from continuing operations before income taxes (TE)	317	300	941	560
Allocated income taxes and TE adjustments	76	71	226	133
INCOME (LOSS) FROM CONTINUING OPERATIONS	241	229	715	427
Income (loss) from discontinued operations, net of taxes	0	0	0	0
NET INCOME (LOSS)	241	229	715	427
Less: Net income (loss) attributable to noncontrolling interests	0	0	0	0
NET INCOME (LOSS) ATTRIBUTABLE TO KEY	241	229	715	427
AVERAGE BALANCES
Loans and leases	39,796	38,354	39,883	36,319
Total assets	42,981	43,304	43,094	40,644
Deposits	89,156	82,829	87,549	78,414
OTHER FINANCIAL DATA
Net loan charge-offs	$ 35	$ 23	$ 105	$ 106
Return on average allocated equity, continuing operations (as a percent)	25.81%	26.21%	26.70%	16.66%
Return on average allocated equity (as a percent)	25.81%	26.21%	26.70%	16.66%
Average full-time equivalent employees | employee	7,976	8,323	8,062	8,171
Operating Segments | Commercial Bank
SUMMARY OF OPERATIONS
Net interest income (TE)	$ 414	$ 427	$ 1,244	$ 1,305
Noninterest income	477	384	1,377	1,023
Total revenue (TE)	891	811	2,621	2,328
Provision for credit losses	(69)	150	(267)	697
Depreciation and amortization expense	34	35	101	108
Other noninterest expense	436	412	1,263	1,144
Income (loss) from continuing operations before income taxes (TE)	490	214	1,524	379
Allocated income taxes and TE adjustments	106	41	324	38
INCOME (LOSS) FROM CONTINUING OPERATIONS	384	173	1,200	341
Income (loss) from discontinued operations, net of taxes	0	0	0	0
NET INCOME (LOSS)	384	173	1,200	341
Less: Net income (loss) attributable to noncontrolling interests	0	0	0	0
NET INCOME (LOSS) ATTRIBUTABLE TO KEY	384	173	1,200	341
AVERAGE BALANCES
Loans and leases	59,914	66,378	60,358	66,374
Total assets	69,285	74,530	69,607	75,205
Deposits	56,546	51,585	54,660	45,350
OTHER FINANCIAL DATA
Net loan charge-offs	$ (6)	$ 103	$ 81	$ 200
Return on average allocated equity, continuing operations (as a percent)	18.68%	13.35%	18.92%	9.19%
Return on average allocated equity (as a percent)	18.68%	13.35%	18.92%	9.19%
Average full-time equivalent employees | employee	2,371	2,312	2,371	2,288
Other
SUMMARY OF OPERATIONS
Net interest income (TE)	$ 29	$ (19)	$ 28	$ (50)
Noninterest income	32	31	110	87
Total revenue (TE)	61	12	138	37
Provision for credit losses	0	13	(23)	15
Depreciation and amortization expense	22	35	95	105
Other noninterest expense	29	(12)	23	(32)
Income (loss) from continuing operations before income taxes (TE)	10	(24)	43	(51)
Allocated income taxes and TE adjustments	(8)	(46)	(27)	(37)
INCOME (LOSS) FROM CONTINUING OPERATIONS	18	22	70	(14)
Income (loss) from discontinued operations, net of taxes	2	4	11	7
NET INCOME (LOSS)	20	26	81	(7)
Less: Net income (loss) attributable to noncontrolling interests	0	0	0	0
NET INCOME (LOSS) ATTRIBUTABLE TO KEY	20	26	81	(7)
AVERAGE BALANCES
Loans and leases	428	187	321	325
Total assets	69,105	50,977	64,493	43,897
Deposits	1,214	530	814	691
OTHER FINANCIAL DATA
Net loan charge-offs	$ 0	$ 2	$ (21)	$ 2
Return on average allocated equity, continuing operations (as a percent)	1.18%	0.96%	1.62%	(0.20%)
Return on average allocated equity (as a percent)	1.31%	1.14%	1.87%	(0.10%)
Average full-time equivalent employees | employee	6,662	6,462	6,601	6,299

Revenue from Contracts with C_3

Revenue from Contracts with Customers (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	$ 490	$ 376	$ 1,303	$ 1,005
Noninterest income	797	681	2,285	1,850
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	121	115	360	328
Investment banking and debt placement fees
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	169	69	367	176
Services charges on deposit accounts
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	91	77	247	229
Cards and payments income
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	107	112	322	265
Other noninterest income
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	2	3	7	7
Noninterest income	275	274	872	758
Operating Segments | Consumer Bank
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	209	191	596	542
Operating Segments | Consumer Bank | Trust and investment services income
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	105	100	311	279
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	56	45	145	138
Operating Segments | Consumer Bank | Cards and payments income
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	46	43	135	118
Operating Segments | Consumer Bank | Other noninterest income
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	2	3	5	7
Operating Segments | Commercial Bank
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	281	185	707	463
Operating Segments | Commercial Bank | Trust and investment services income
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	16	15	49	49
Operating Segments | Commercial Bank | Investment banking and debt placement fees
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	169	69	367	176
Operating Segments | Commercial Bank | Services charges on deposit accounts
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	35	32	102	91
Operating Segments | Commercial Bank | Cards and payments income
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	61	69	187	147
Operating Segments | Commercial Bank | Other noninterest income
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	2	0
Other
Disaggregation of Revenue [Line Items]
Noninterest income	$ 32	$ 31	$ 110	$ 87

Uncategorized Items - key-20210

Label	Element	Value
Accounting Standards Update [Extensible Enumeration]	us-gaap_AccountingStandardsUpdateExtensibleList	Accounting Standards Update 2016-13 [Member]
Commercial Bank [Member]
Goodwill	us-gaap_Goodwill	$ 912,000,000
Consumer Bank [Member]
Goodwill	us-gaap_Goodwill	$ 1,752,000,000