KeyCorp (KEY) 10-K 26 Feb 14 2013 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
	Dec. 31, 2013	Feb. 24, 2014	Jun. 28, 2013
Document And Entity Information [Abstract]	'	'	'
Document Type	'10-K	'	'
Amendment Flag	'false	'	'
Document Period End Date	31-Dec-13	'	'
Document Fiscal Year Focus	'2013	'	'
Document Fiscal Period Focus	'FY	'	'
Trading Symbol	'KEY	'	'
Entity Registrant Name	'KEYCORP /NEW/	'	'
Entity Central Index Key	'0000091576	'	'
Current Fiscal Year End Date	'--12-31	'	'
Entity Well-known Seasoned Issuer	'Yes	'	'
Entity Current Reporting Status	'Yes	'	'
Entity Voluntary Filers	'No	'	'
Entity Filer Category	'Large Accelerated Filer	'	'
Entity Common Stock, Shares Outstanding	'	889,398,493	'
Entity Public Float	'	'	$10,078,228,828

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2013		Dec. 31, 2012
In Millions, unless otherwise specified
ASSETS	'		'
Cash and due from banks	$617		$584
Short-term investments	5,590		3,940
Trading account assets	738		605
Securities available for sale	12,346		12,094
Held-to-maturity securities (fair value: $4,617 and $3,992)	4,756		3,931
Other investments	969		1,064
Loans, net of unearned income of $805 and $957	54,457		52,822
Less: Allowance for loan and lease losses	848		888
Net loans	53,609		51,934
Loans held for sale	611		599
Premises and equipment	885		965
Operating lease assets	305		288
Goodwill	979		979
Other intangible assets	127		171
Corporate-owned life insurance	3,408		3,333
Derivative assets	407		693
Accrued income and other assets (including $22 of consolidated LIHTC guaranteed funds VIEs, see Note 11)	3,015	[1]	2,774	[1]
Discontinued assets (including $1,980 of consolidated education loan securitization trust VIEs (see Note 11) and $147 of loans in portfolio at fair value	4,572	[1]	5,282	[1]
Total assets	92,934		89,236
Deposits in domestic offices:	'		'
NOW and money market deposit accounts	33,952		32,380
Savings deposits	2,472		2,433
Certificates of deposit ($100,000 or more)	2,631		2,879
Other time deposits	3,648		4,575
Total interest-bearing	42,703		42,267
Noninterest-bearing	26,001		23,319
Deposits in foreign office - interest-bearing	558		407
Total deposits	69,262		65,993
Federal funds purchased and securities sold under repurchase agreements	1,534		1,609
Bank notes and other short-term borrowings	343		287
Derivative liabilities	414		584
Accrued expense and other liabilities	1,557		1,387
Long-term debt	7,650		6,847
Discontinued liabilities (including $1,854 of consolidated education loan securitization trust VIEs at fair value, see Note 11)	1,854	[1]	2,220	[1]
Total liabilities	82,614		78,927
EQUITY	'		'
Common shares, $1 par value; authorized 1,400,000,000 shares; issued 1,016,969,905 and 1,016,969,905 shares	1,017		1,017
Capital surplus	4,022		4,126
Retained earnings	7,606		6,913
Treasury stock, at cost (126,245,538 and 91,201,285 shares)	-2,281		-1,952
Accumulated other comprehensive income (loss)	-352		-124
Key shareholders' equity	10,303		10,271
Noncontrolling interests	17		38
Total equity	10,320		10,309
Total liabilities and equity	92,934		89,236
Series A Preferred Stock [Member]	'		'
EQUITY	'		'
Preferred stock, $1 par value, authorized 25,000,000 shares: 7.75% Noncumulative Perpetual Convertible Preferred Stock, Series A, $100 liquidation preference; authorized 7,475,000 shares; issued 2,904,839 and 2,904,839 shares	$291		$291
[1]	The assets of the VIEs can only be used by the particular VIE and there is no recourse to Key with respect to the liabilities of the consolidated LIHTC or education loan securitization trust VIEs.

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, except Share data, unless otherwise specified
Held-to-maturity securities, fair value	$4,617	$3,992
Unearned income on loans	805	957
Consolidated guaranteed funds VIEs, for accrued income and other assets	22	22
Consolidated education loan securitizations trust VIEs at fair value, Discontinued assets	1,980	1,980
Loan securitization trust VIEs	147	147
Aggregate amount of certificates of deposit	'$100,000 or more	'$100,000 or more
Consolidated education loan securitization trust VIEs at fair value, Discontinued liabilities	$1,854	$1,854
Preferred stock, par value	$1	$1
Preferred stock, shares authorized	25,000,000	25,000,000
Common shares, par value	$1	$1
Common shares, shares authorized	1,400,000,000	1,400,000,000
Common shares, shares issued	1,016,969,905	1,016,969,905
Treasury stock, shares	126,245,538	91,201,285
Series A Preferred Stock [Member]	'	'
Preferred stock, liquidation preference	$100	$100
Preferred stock, shares authorized	7,475,000	7,475,000
Preferred stock, shares issued, Total	2,904,839	2,904,839
Preferred stock, dividend rate	7.75%	7.75%

Consolidated_Statements_of_Inc

Consolidated Statements of Income (USD $)	12 Months Ended
In Millions, except Share data in Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
INTEREST INCOME	'		'		'
Loans	$2,151		$2,155		$2,206
Loans held for sale	20		20		14
Securities available for sale	311		399		583
Held-to-maturity securities	82		69		12
Trading account assets	21		18		26
Short-term investments	6		6		6
Other investments	29		38		42
Total interest income	2,620		2,705		2,889
INTEREST EXPENSE	'		'		'
Deposits	158		257		390
Federal funds purchased and securities sold under repurchase agreements	2		4		5
Bank notes and other short-term borrowings	8		7		11
Long-term debt	127		173		216
Total interest expense	295		441		622
NET INTEREST INCOME	2,325		2,264		2,267
Provision (credit) for loan and lease losses	130		229		-60
Net interest income (expense) after provision for loan and lease losses	2,195		2,035		2,327
NONINTEREST INCOME	'		'		'
Trust and investment services income	393		375		353
Investment banking and debt placement fees	333		327		224
Service charges on deposit accounts	281		287		281
Operating lease income and other leasing gains	108		195		157
Corporate services income	172		168		197
Cards and payments income	162		135		163
Corporate-owned life insurance income	120		122		121
Consumer mortgage income	19		40		32
Mortgage servicing fees	58		24		26
Net gains (losses) from principal investing	52		72		78
Other income	68	[1]	111	[1]	56	[1]
Total noninterest income	1,766		1,856		1,688
NONINTEREST EXPENSE	'		'		'
Personnel	1,609		1,570		1,460
Net occupancy	275		260		258
Computer processing	156		164		166
Business services and professional fees	151		190		183
Equipment	104		107		103
Operating lease expense	47		57		94
Marketing	51		68		60
FDIC assessment	30		31		52
Intangible asset amortization on credit cards	30		14		'
Other intangible asset amortization	14		9		4
Provision (credit) for losses on lending-related commitments	8		-16		-28
OREO expense, net	7		15		13
Other expense	338		349		319
Total noninterest expense	2,820		2,818		2,684
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	1,141		1,073		1,331
Income taxes	271		231		364
INCOME (LOSS) FROM CONTINUING OPERATIONS	870		842		967
Income (loss) from discontinued operations, net of taxes of $26, $14 and ($21) (see Note 13)	40		23		-35
NET INCOME (LOSS)	910		865		932
Less: Net income (loss) attributable to noncontrolling interests	'		7		12
NET INCOME (LOSS) ATTRIBUTABLE TO KEY	910		858		920
Income (loss) from continuing operations attributable to Key common shareholders	847		813		848
Net income (loss) attributable to Key common shareholders	$887		$836		$813
Per common share:	'		'		'
Income (loss) from continuing operations attributable to Key common shareholders	$0.93		$0.87		$0.91
Income (loss) from discontinued operations, net of taxes	$0.04		$0.02		($0.04)
Net income (loss) attributable to Key common shareholders	$0.98	[2]	$0.89	[2]	$0.87	[2]
Per common share - assuming dilution:	'		'		'
Income (loss) from continuing operations attributable to Key common shareholders	$0.93		$0.86		$0.91
Income (loss) from discontinued operations, net of taxes	$0.04		$0.02		($0.04)
Net income (loss) attributable to Key common shareholders	$0.97	[2]	$0.89	[2]	$0.87	[2]
Cash dividends declared per common share	$0.22		$0.18		$0.10
Weighted-average common shares outstanding (000)	906,524	[3]	938,941	[3]	931,934	[3]
Weighted-average common shares and potential common shares outstanding (000)	912,571		943,259		935,801
[1]	For the years ended December 31, 2013, 2012, and 2011, net securities gains (losses) totaled $1 million, less than $1 million, and $1 million, respectively. For 2013, 2012, and 2011, we did not have any impairment losses related to securities.
[2]	EPS may not foot due to rounding.
[3]	Assumes conversion of stock options and/or Series A Preferred Stock, as applicable.

Consolidated_Statements_of_Inc1

Consolidated Statements of Income (Parenthetical) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net tax effect on income (loss) from discontinued operations	$26	$14	($21)
Net securities losses (gains)	1	'	1
Impairment losses related to securities	0	0	0
Maximum [Member]	'	'	'
Net securities losses (gains)	'	$1	'

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement Of Income And Comprehensive Income [Abstract]	'	'	'
Net income (loss)	$910	$865	$932
Other comprehensive income (loss), net of tax:	'	'	'
Net unrealized gains (losses) on securities available for sale, net of income taxes of ($173), ($58), and $46	-292	-98	77
Net unrealized gains (losses) on derivative financial instruments, net of income taxes of ($17), $12, and ($6)	-29	20	-10
Foreign currency translation adjustments, net of income taxes of ($3), ($3), and $5	-13	10	-4
Net pension and postretirement benefit costs, net of income taxes of $63, ($17), and ($44)	106	-28	-74
Total other comprehensive income (loss), net of tax	-228	-96	-11
Comprehensive income (loss)	682	769	921
Less: Comprehensive income attributable to noncontrolling interests	'	7	12
Comprehensive income (loss) attributable to Key	$682	$762	$909

Consolidated_Statements_of_Com1

Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement Of Income And Comprehensive Income [Abstract]	'	'	'
Income taxes effect on net unrealized (losses) gains on securities available for sale	($173)	($58)	$46
Income taxes effect on net unrealized (losses) gains on derivative financial instruments	-17	12	-6
Income taxes effect on foreign currency translation adjustments	-3	-3	5
Income taxes effect on net pension and postretirement benefit costs	$63	($17)	($44)

Consolidated_Statements_of_Cha

Consolidated Statements of Changes in Equity (USD $)

Total

Preferred Stock [Member]

Preferred Stock [Member]

Common Shares [Member]

Common Stock Warrant [Member]

Capital Surplus [Member]

Retained Earnings [Member]

Retained Earnings [Member]

Retained Earnings [Member]

Treasury Stock, at Cost [Member]

Accumulated Other Comprehensive Income (Loss) [Member]

Noncontrolling Interests [Member]

In Millions, except Share data in Thousands, unless otherwise specified

Series B Preferred Stock [Member]

Series A Preferred Stock [Member]

Series B Preferred Stock [Member]

Beginning Balance at Dec. 31, 2010

'

$2,737

'

$946

$87

$3,711

$5,557

'

'

($1,904)

($17)

$257

Beginning Balance, Common Shares at Dec. 31, 2010

'

'

'

880,608

'

'

'

'

'

'

'

'

Beginning Balance, Preferred Shares at Dec. 31, 2010

'

2,930

'

'

'

'

'

'

'

'

'

'

Correction of an error in cumulative effect adjustment

'

'

'

'

'

'

-30

'

'

'

'

'

Net income (loss)

932

'

'

'

'

'

920

'

'

'

'

12

Other comprehensive income (loss):

'

'

'

'

'

'

'

'

'

'

'

'

Net unrealized gains (losses) on securities available for sale, net of income taxes

77

'

'

'

'

'

'

'

'

'

77

'

Net unrealized gains (losses) on derivative financial instruments, net of income taxes

-10

'

'

'

'

'

'

'

'

'

-10

'

Foreign currency translation adjustments, net of income taxes

-4

'

'

'

'

'

'

'

'

'

-4

'

Net pension and postretirement benefit costs, net of income taxes

-74

'

'

'

'

'

'

'

'

'

-74

'

Deferred compensation

'

'

'

'

'

-2

'

'

'

'

'

'

Cash dividends declared on common shares

'

'

'

'

'

'

-94

'

'

'

'

'

Preferred Stock - TARP redemption, value

'

-2,451

'

'

'

'

-49

'

'

'

'

'

Cash dividends declared on Preferred Stock

'

'

'

'

'

'

'

-23

-31

'

'

'

Preferred Stock - TARP redemption, shares

'

-25

'

'

'

'

'

'

'

'

'

'

Repurchase of common stock warrant

'

'

'

'

-87

17

'

'

'

'

'

'

Amortization of discount on Series B Preferred Stock

'

'

4

'

'

'

'

'

-4

'

'

'

Common shares issuance, value

'

'

'

71

'

533

'

'

'

'

'

'

Common shares issuance, shares

'

'

'

70,621

'

'

'

'

'

'

'

'

Common shares reissued (returned) for stock options and other employee benefit plans

'

'

'

'

'

-65

'

'

'

89

'

'

Common shares reissued (returned) for stock options and other employee benefit plans, shares

'

'

'

1,779

'

'

'

'

'

'

'

'

Other

'

1

'

'

'

'

'

'

'

'

'

'

Net contribution from (distribution to) noncontrolling interests

'

'

'

'

'

'

'

'

'

'

'

-252

Ending Balance at Dec. 31, 2011

'

291

'

1,017

'

4,194

6,246

'

'

-1,815

-28

17

Ending Balance, Common Shares at Dec. 31, 2011

'

'

'

953,008

'

'

'

'

'

'

'

'

Ending Balance, Preferred Shares at Dec. 31, 2011

'

2,905

'

'

'

'

'

'

'

'

'

'

Net income (loss)

865

'

'

'

'

'

858

'

'

'

'

7

Other comprehensive income (loss):

'

'

'

'

'

'

'

'

'

'

'

'

Net unrealized gains (losses) on securities available for sale, net of income taxes

-98

'

'

'

'

'

'

'

'

'

-98

'

Net unrealized gains (losses) on derivative financial instruments, net of income taxes

20

'

'

'

'

'

'

'

'

'

20

'

Foreign currency translation adjustments, net of income taxes

10

'

'

'

'

'

'

'

'

'

10

'

Net pension and postretirement benefit costs, net of income taxes

-28

'

'

'

'

'

'

'

'

'

-28

'

Deferred compensation

'

'

'

'

'

17

'

'

'

'

'

'

Cash dividends declared on common shares

'

'

'

'

'

'

-169

'

'

'

'

'

Cash dividends declared on Preferred Stock

'

'

'

'

'

'

'

-22

'

'

'

'

Common shares repurchased, value

'

'

'

'

'

'

'

'

'

-251

'

'

Common shares repurchased, shares

'

'

'

-30,637

'

'

'

'

'

'

'

'

Common shares reissued (returned) for stock options and other employee benefit plans

'

'

'

'

'

-85

'

'

'

114

'

'

Common shares reissued (returned) for stock options and other employee benefit plans, shares

'

'

'

3,398

'

'

'

'

'

'

'

'

Net contribution from (distribution to) noncontrolling interests

'

'

'

'

'

'

'

'

'

'

'

14

Ending Balance at Dec. 31, 2012

10,309

291

'

1,017

'

4,126

6,913

'

'

-1,952

-124

38

Ending Balance, Common Shares at Dec. 31, 2012

'

'

'

925,769

'

'

'

'

'

'

'

'

Ending Balance, Preferred Shares at Dec. 31, 2012

'

2,905

'

'

'

'

'

'

'

'

'

'

Net income (loss)

910

'

'

'

'

'

910

'

'

'

'

'

Other comprehensive income (loss):

'

'

'

'

'

'

'

'

'

'

'

'

Net unrealized gains (losses) on securities available for sale, net of income taxes

-292

'

'

'

'

'

'

'

'

'

-292

'

Net unrealized gains (losses) on derivative financial instruments, net of income taxes

-29

'

'

'

'

'

'

'

'

'

-29

'

Foreign currency translation adjustments, net of income taxes

-13

'

'

'

'

'

'

'

'

'

-13

'

Net pension and postretirement benefit costs, net of income taxes

106

'

'

'

'

'

'

'

'

'

106

'

Cash dividends declared on common shares

'

'

'

'

'

'

-194

'

'

'

'

'

Cash dividends declared on Preferred Stock

'

'

'

'

'

'

'

-23

'

'

'

'

Common shares repurchased, value

-474

'

'

'

'

'

'

'

'

-474

'

'

Common shares repurchased, shares

'

'

'

-41,599

'

'

'

'

'

'

'

'

Common shares reissued (returned) for stock options and other employee benefit plans

'

'

'

'

'

-104

'

'

'

145

'

'

Common shares reissued (returned) for stock options and other employee benefit plans, shares

'

'

'

6,554

'

'

'

'

'

'

'

'

Net contribution from (distribution to) noncontrolling interests

'

'

'

'

'

'

'

'

'

'

'

-21

Ending Balance at Dec. 31, 2013

$10,320

$291

'

$1,017

'

$4,022

$7,606

'

'

($2,281)

($352)

$17

Ending Balance, Common Shares at Dec. 31, 2013

'

'

'

890,724

'

'

'

'

'

'

'

'

Ending Balance, Preferred Shares at Dec. 31, 2013

'

2,905

'

'

'

'

'

'

'

'

'

'

Consolidated_Statements_of_Cha1

Consolidated Statements of Changes in Equity (Parenthetical) (USD $)	12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income taxes effect on net unrealized (losses) gains on securities available for sale	($173)	($58)	$46
Income taxes effect on net unrealized gains (losses) on derivative financial instruments	-17	12	-6
Income taxes effect on foreign currency translation adjustments	-3	-3	5
Income taxes effect on net pension and postretirement benefit costs	63	-17	-44
Cash dividends declared on common shares, per share	$0.22	$0.18	$0.10
Retained Earnings [Member]	'	'	'
Cash dividends declared on common shares, per share	$0.22	$0.18	$0.10
Retained Earnings [Member] | Series A Preferred Stock [Member]	'	'	'
Cash dividends declared on Preferred Stock, per share	$7.75	$7.75	$7.75
Retained Earnings [Member] | Series B Preferred Stock [Member]	'	'	'
Cash dividends declared on Preferred Stock, per share	'	'	5.00%
Accumulated Other Comprehensive Income (Loss) [Member]	'	'	'
Income taxes effect on net unrealized (losses) gains on securities available for sale	-173	-58	46
Income taxes effect on net unrealized gains (losses) on derivative financial instruments	-17	12	-6
Income taxes effect on foreign currency translation adjustments	-3	-3	5
Income taxes effect on net pension and postretirement benefit costs	$63	($17)	($44)

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
OPERATING ACTIVITIES	'	'	'
Net income (loss)	$910	$865	$932
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:	'	'	'
Provision (credit) for loan and lease losses	130	229	-60
Provision (credit) for losses on lending-related commitments	8	-16	-28
Provision (credit) for losses on LIHTC guaranteed funds	4	'	-5
Depreciation, amortization and accretion expense, net	193	204	201
Increase in cash surrender value of corporate-owned life insurance	-106	-110	-111
Stock-based compensation expense	35	49	41
FDIC reimbursement (payments), net of FDIC expense	296	26	46
Deferred income taxes (benefit)	29	35	317
Proceeds from sales of loans held for sale	5,605	5,541	3,796
Originations of loans held for sale, net of repayments	-5,440	-5,189	-3,922
Net losses (gains) from sale of loans held for sale	-125	-150	-75
Net losses (gains) from principal investing	-52	-72	-78
Net losses (gains) and writedown on OREO	6	13	9
Net losses (gains) on leased equipment	-43	-111	-25
Net losses (gains) on sales of fixed assets	12	2	2
Net securities losses (gains)	-1	'	-1
Gain on sale of Victory	-92	'	'
Net decrease (increase) in trading account assets	-133	18	362
Other operating activities, net	343	-66	392
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	1,579	1,268	1,793
INVESTING ACTIVITIES	'	'	'
Cash received (used) in acquisitions, net of cash acquired	601	776	'
Proceeds from sale of Victory	72	'	'
Net decrease (increase) in short-term investments	-1,650	-421	-2,175
Purchases of securities available for sale	-5,222	-1,772	-624
Proceeds from sales of securities available for sale	35	1	1,667
Proceeds from prepayments and maturities of securities available for sale	4,470	5,551	5,000
Proceeds from prepayments and maturities of held-to-maturity securities	847	660	83
Purchases of held-to-maturity securities	-1,672	-2,481	-2,175
Purchases of other investments	-46	-66	-138
Proceeds from sales of other investments	187	28	90
Proceeds from prepayments and maturities of other investments	6	197	111
Net decrease (increase) in loans, excluding acquisitions, sales and transfers	-1,999	-2,904	-297
Proceeds from sales of portfolio loans	185	277	218
Proceeds from corporate-owned life insurance	31	33	22
Purchases of premises, equipment, and software	-100	-164	-180
Proceeds from sales of premises and equipment	8	1	1
Proceeds from sales of other real estate owned	23	67	120
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES	-4,224	-217	1,723
FINANCING ACTIVITIES	'	'	'
Net increase (decrease) in deposits, excluding acquisitions	2,333	1,989	1,346
Net increase (decrease) in short-term borrowings	-18	-152	-1,148
Net proceeds from issuance of long-term debt	2,573	837	1,046
Payments on long-term debt	-1,545	-3,394	-2,215
Repurchase of common shares	-474	-251	'
Net proceeds from issuance of common shares	'	'	604
Net proceeds from reissuance of common shares	26	2	'
Series B Preferred Stock - TARP redemption	'	'	-2,500
Repurchase of common stock warrant	'	'	-70
Cash dividends paid	-217	-191	-164
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	2,678	-1,160	-3,101
NET INCREASE (DECREASE) IN CASH AND DUE FROM BANKS	33	-109	415
CASH AND DUE FROM BANKS AT BEGINNING OF YEAR	584	693	278
CASH AND DUE FROM BANKS AT END OF YEAR	617	584	693
Additional disclosures relative to cash flows:	'	'	'
Interest paid	293	464	605
Income taxes paid (refunded)	185	84	-305
Noncash items:	'	'	'
Assets acquired	41	1,283	'
Liabilities assumed	'	2,059	'
Loans transferred to portfolio from held for sale	9	41	13
Loans transferred to held for sale from portfolio	61	118	103
Loans transferred to other real estate owned	$21	$38	$49

Summary_of_Significant_Account

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
Summary of Significant Accounting Policies	'
	1. Summary of Significant Accounting Policies
	The acronyms and abbreviations identified below are used in the Notes to Consolidated Financial Statements as well as in the Management’s Discussion and Analysis of Financial Condition and Results of Operations. You may find it helpful to refer back to this page as you read this report.
	ABO: Accumulated benefit obligation.	KEF: Key Equipment Finance.
	AICPA: American Institute of Certified Public Accountants.	LIBOR: London Interbank Offered Rate.
	ALCO: Asset/Liability Management Committee.	LIHTC: Low-income housing tax credit.
	ALLL: Allowance for loan and lease losses.	Moody’s: Moody’s Investor Services, Inc.
	A/LM: Asset/liability management.	MSRs: Mortgage servicing rights.
	AOCI: Accumulated other comprehensive income (loss).	N/A: Not applicable.
	APBO: Accumulated postretirement benefit obligation.	NASDAQ: The NASDAQ Stock Market LLC.
	Austin: Austin Capital Management, Ltd.	N/M: Not meaningful.
	BHCA: Bank Holding Company Act of 1956, as amended.	NOW: Negotiable Order of Withdrawal.
	BHCs: Bank holding companies.	NPLs: Nonperforming loans.
	CCAR: Comprehensive Capital Analysis and Review.	NPR: Notice of proposed rulemaking.
	CFPB: Consumer Financial Protection Bureau.	NYSE: New York Stock Exchange.
	CFTC: Commodities Futures Trading Commission.	OCC: Office of the Comptroller of the Currency.
	CMBS: Commercial mortgage-backed securities.	OCI: Other comprehensive income (loss).
	CMO: Collateralized mortgage obligation.	OFR: Office of Financial Research of the U.S. Department of Treasury.
	Common shares: Common Shares, $1 par value.	OREO: Other real estate owned.
	CPP: Capital Purchase Program of the U.S. Treasury.	OTTI: Other-than-temporary impairment.
	DIF: Deposit Insurance Fund of the FDIC.	QSPE: Qualifying special purpose entity.
	Dodd-Frank Act: Dodd-Frank Wall Street Reform and	PBO: Projected benefit obligation.
	Consumer Protection Act of 2010.	PCCR: Purchased credit card relationship.
	EPS: Earnings per share.	PCI: Purchased credit impaired.
	ERISA: Employee Retirement Income Security Act of 1974.	S&P: Standard and Poor’s Ratings Services, a Division of The McGraw-Hill Companies, Inc.
	ERM: Enterprise risk management.	SEC: U.S. Securities & Exchange Commission.
	EVE: Economic value of equity.	Series A Preferred Stock: KeyCorp’s 7.750% Noncumulative
	FASB: Financial Accounting Standards Board.	Perpetual Convertible Preferred Stock, Series A.
	FDIA: Federal Deposit Insurance Act, as amended.	SIFIs: Systemically important financial institutions, including BHCs with total consolidated assets of at least $50 billion and nonbank financial companies designated by FSOC for supervision by the Federal Reserve.
	FDIC: Federal Deposit Insurance Corporation.	TARP: Troubled Asset Relief Program.
	Federal Reserve: Board of Governors of the Federal Reserve	TDR: Troubled debt restructuring.
	System.	TE: Taxable equivalent.
	FHLMC: Federal Home Loan Mortgage Corporation.	U.S. Treasury: United States Department of the Treasury.
	FINRA: Financial Industry Regulatory Authority.	VaR: Value at risk.
	FNMA: Federal National Mortgage Association.	VEBA: Voluntary Employee Beneficiary Association.
	FOMC: Federal Open Market Committee of the Federal Reserve Board.	Victory: Victory Capital Management and/or
	FSOC: Financial Stability Oversight Council.	Victory Capital Advisors.
	FVA: Fair value of pension plan assets.	VIE: Variable interest entity.
	GAAP: U.S. generally accepted accounting principles.	XBRL: eXtensible Business Reporting Language.
	GNMA: Government National Mortgage Association.
	IRS: Internal Revenue Service.
	ISDA: International Swaps and Derivatives Association.
	KAHC: Key Affordable Housing Corporation.
	Organization
	We are one of the nation’s largest bank-based financial services companies, with consolidated total assets of $92.9 billion at December 31, 2013. We provide deposit, lending, cash management and investment services to individuals and to small and medium-sized businesses through our subsidiary, KeyBank. We also provide a broad range of sophisticated corporate and investment banking products, such as merger and acquisition advice, public and private debt and equity, syndications, and derivatives to middle market companies in selected industries throughout the United States through our subsidiary, KeyBanc Capital Markets. As of December 31, 2013, KeyBank operated 1,028 full-service retail banking branches and 1,335 automated teller machines in 12 states, as well as additional offices, online and mobile banking capabilities, and a telephone banking call center. Additional information pertaining to our two major business segments, Key Community Bank and Key Corporate Bank, is included in Note 23 (“Line of Business Results”).
	Use of Estimates
	Our accounting policies conform to GAAP and prevailing practices within the financial services industry. We must make certain estimates and judgments when determining the amounts presented in our consolidated financial statements and the related notes. If these estimates prove to be inaccurate, actual results could differ from those reported.
	Basis of Presentation
	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 impact 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% generally are carried at cost. Investments held by our registered broker-dealer and investment company subsidiaries (primarily principal investments) are carried at fair value.
	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.
	Noncontrolling Interests
	Our Principal Investing unit and the Real Estate Capital and Corporate Banking Services line of business have noncontrolling interests that are accounted for in accordance with the applicable accounting guidance, which allows us to report noncontrolling interests in subsidiaries as a component of equity on the balance sheet. “Net income (loss)” on the income statement includes Key’s revenues, expenses, gains and losses, together with revenues, expenses, gains and losses pertaining to the noncontrolling interests. The portion of net results attributable to the noncontrolling interests is disclosed separately on the face of the income statement to arrive at the “net income (loss) attributable to Key.”
	Statements of Cash Flows
	Cash and due from banks are considered “cash and cash equivalents” for financial reporting purposes.
	Loans
	Loans are carried at the principal amount outstanding, net of unearned income, including net deferred loan fees and costs. We defer certain nonrefundable loan origination and commitment fees, and the direct costs of originating or acquiring loans. The net deferred amount is amortized over the estimated lives of the related loans as an adjustment to the yield.
	Direct financing leases are carried at the aggregate of the lease receivable plus estimated unguaranteed residual values, less unearned income and deferred initial direct fees and costs. Unearned income on direct financing leases is amortized over the lease terms using a method approximating the interest method that produces a constant rate of return. Deferred initial direct fees and costs are amortized over the lease terms as an adjustment to the yield.
	Leveraged leases are carried net of nonrecourse debt. Revenue on leveraged leases is recognized on a basis that produces a constant rate of return on the outstanding investment in the leases, net of related deferred tax liabilities, during the years in which the net investment is positive.
	The residual value component of a lease represents the fair value of the leased asset at the end of the lease term. We rely on industry data, historical experience, independent appraisals and the experience of the equipment leasing asset management team to value lease residuals. Relationships with a number of equipment vendors give the asset management team insight into the life cycle of the leased equipment, pending product upgrades and competing products.
	In accordance with applicable accounting guidance for leases, residual values are reviewed at least annually to determine if an other-than-temporary decline in value has occurred. In the event of such a decline, the residual value is adjusted to its fair value. Impairment charges are included in noninterest expense, while net gains or losses on sales of lease residuals are included in “other income” on the income statement.
	Loans Held for Sale
	Our loans held for sale at December 31, 2013, and December 31, 2012, are disclosed in Note 4 (“Loans and Loans Held for Sale”). These loans, which we originated and intend to sell, are carried at the lower of aggregate cost or fair value. Fair value is determined based on available market data for similar assets, expected cash flows, and appraisals of underlying collateral or the credit quality of the borrower. If a loan is transferred from the loan portfolio to the held-for-sale category, any write-down in the carrying amount of the loan at the date of transfer is recorded as a charge-off. Subsequent declines in fair value are recognized as a charge to noninterest income. When a loan is placed in the held-for-sale category, we stop amortizing the related deferred fees and costs. The remaining unamortized fees and costs are recognized as part of the cost basis of the loan at the time it is sold.
Nonperforming Loans
Nonperforming loans are loans for which we do not accrue interest income, and include commercial and consumer loans and leases, as well as current year TDRs and nonaccruing TDR loans from prior years. Nonperforming loans do not include loans held for sale or PCI loans.
We generally will classify commercial loans as nonperforming and stop accruing interest (i.e., designate the loan “nonaccrual”) when the borrower’s principal or interest payment is 90 days past due or the loan is well-secured and in the process of collection. Commercial loans are also placed on nonaccrual status when payment is not past due but we have serious doubts about the borrower’s ability to comply with existing repayment terms. Once a loan is designated nonaccrual (and as a result impaired), the interest accrued but not collected generally is charged against the ALLL, and payments subsequently received generally are applied to principal. However, if we believe that all principal and interest on a commercial nonaccrual loan ultimately are collectible, interest income may be recognized as received. Commercial loans generally are charged off in full or charged down to the fair value of the underlying collateral when the borrower’s payment is 180 day past due.
We generally will classify consumer loans as nonperforming and stop accruing interest when the borrower’s payment is 120 days past due, unless the loan is well-secured and in the process of collection. Any second lien home equity loan with an associated first lien that is 120 days or more past due or in foreclosure, or for which the first mortgage delinquency timeframe is unknown, is reported as a nonperforming loan. Secured loans that are discharged through Chapter 7 bankruptcy and not formally re-affirmed are designated as nonperforming and TDRs. Our charge-off policy for most consumer loans takes effect when payments are 120 days past due. Home equity and residential mortgage loans generally are charged down to the fair value of the underlying collateral when payment is 180 days past due. Credit card loans, and similar unsecured products, continue to accrue interest until the account is charged off at 180 days past due.
Commercial and consumer loans may be returned to accrual status if we are reasonably assured that all contractually due principal and interest are collectible and the borrower has demonstrated a sustained period (generally 6 months) of repayment performance under the contracted terms of the loan and applicable regulation.
Impaired Loans
A nonperforming loan is considered to be impaired and assigned a specific reserve when, based on current information and events, it is probable that we will be unable to collect all amounts due (both principal and interest) according to the contractual terms of the loan agreement.
All commercial and consumer TDRs regardless of size and all impaired commercial loans with an outstanding balance $2.5 million or greater are individually evaluated for impairment. Nonperforming loans of less than $2.5 million and smaller-balance homogeneous loans (residential mortgage, home equity loans, marine, etc.) are aggregated and collectively evaluated for impairment. The amount of the reserve is estimated based on the criteria outlined in the “Allowance for Loan and Lease Losses” section of this note.
Allowance for Loan and Lease Losses
The ALLL represents our estimate of probable credit losses inherent in the loan portfolio at the balance sheet date. We establish the amount of this allowance by analyzing the quality of the loan portfolio at least quarterly, and more often if deemed necessary. When developing and documenting our methodology to determine the ALLL, we segregate our loan portfolio between commercial and consumer loans. We believe these portfolio segments represent the most appropriate level for determining our historical loss experience, as well as the level at which we monitor credit quality and risk characteristics of the portfolios. Commercial loans, which generally have larger individual balances, constitute a significant portion of our total loan portfolio. The consumer portfolio typically includes smaller balance, homogeneous loans.
We estimate the appropriate level of our ALLL by applying expected loss rates to existing loans with similar risk characteristics. Expected loss rates for commercial loans are derived from a statistical analysis of our historical default and loss severity experience. The analysis utilizes probability of default and loss given default to assign loan grades using our internal risk rating system. Our expected loss rates are reviewed quarterly and updated as necessary. As of December 31, 2013, the probability of default ratings were based on our default data for the period from January 2008 through October 2013, which encompasses the last downturn period as well as some of our more recent credit experience. We adjust expected loss rates based on calculated estimates of the average time period from initial loss indication to the initial loss recorded for an individual loan.
Expected loss rates for consumer loans are derived from a statistical analysis of our historical default and loss severity experience. Consumer loans are analyzed quarterly in homogeneous product type pools that share similar attributes and are assigned an expected loss rate that represents expected losses over the next 12 months. The estimate of the average time period from initial loss indication to initial loss recorded for consumer loans is one to one and one-half years.
The ALLL may be adjusted to reflect our current assessment of many qualitative factors that may not be directly measured in the statistical analysis of expected loss, including:
¿	changes in international, national, regional, and local economic and business conditions;
¿	changes in the experience, ability and depth of our lending management and staff;
¿	changes in lending policies and procedures, including changes in underwriting standards and collection, charge-off and recovery practices;
¿	changes in the nature and volume of the loan portfolio, including the existence and effect of any concentrations of credit, and changes in the level of such concentrations;
¿	changes in the volume and/or severity of past due, nonaccrual and adversely classified or graded loans; and
¿	external factors, such as competition, legal developments and regulatory requirements.
For all commercial and consumer loan TDRs, regardless of size, as well as impaired commercial loans with an outstanding balance of $2.5 million and greater, we conduct further analysis to determine the probable loss content and assign a specific allowance to the loan if deemed appropriate. We estimate the extent of the individual impairment for commercial loans and TDRs by comparing the recorded investment of the loan with the estimated present value of its future cash flows, the fair value of its underlying collateral, or the loan’s observable market price. Secured consumer loan balances of TDRs that are discharged through Chapter 7 bankruptcy and not formally re-affirmed are adjusted to reflect the fair value of the underlying collateral, less costs to sell. Other consumer loan TDRs are combined in homogenous pools and assigned a specific allocation based on the estimated present value of future cash flows using the effective interest rate. A specific allowance also may be assigned — even when sources of repayment appear sufficient — if we remain uncertain about whether the loan will be repaid in full. On at least a quarterly basis, we evaluate the appropriateness of our loss estimation methods to reduce differences between estimated incurred losses and actual losses.
While quantitative modeling factors such as default probability and expected recovery rates are constantly changing as the financial strength of the borrower and overall economic conditions change, there have been no changes to the accounting policies or methodology we used to estimate the ALLL.
Liability for Credit Losses on Lending-Related Commitments
The liability for credit losses inherent in lending-related commitments, such as letters of credit and unfunded loan commitments, is included in “accrued expense and other liabilities” on the balance sheet. This liability totaled $37 million at December 31, 2013, and $29 million at December 31, 2012. We establish the amount of this allowance by considering both historical trends and current market conditions quarterly, or more often if deemed necessary.
Fair Value Measurements
We follow the applicable accounting guidance for fair value measurements and disclosures for all applicable financial and nonfinancial assets and liabilities. This guidance defines fair value, establishes a framework for measurement, and addresses disclosures about fair value measurements. Fair value-related guidance applies only when other guidance requires or permits assets or liabilities to be measured at fair value; it does not expand the use of fair value to any new circumstances.
Accounting guidance defines fair value as the price to sell an asset or transfer a liability in an orderly transaction between market participants in our principal market. In other words, fair value represents an exit price at the measurement date. Market participants are buyers and sellers who are independent, knowledgeable, and willing and able to transact in the principal (or most advantageous) market for the asset or liability being measured. Current market conditions, including imbalances between supply and demand, are considered in determining fair value.
We value our assets and liabilities based on the principal market where each would be sold (in the case of assets) or transferred (in the case of liabilities). The principal market is the forum with the greatest volume and level of activity. In the absence of a principal market, valuation is based on the most advantageous market (i.e., the market where the asset could be sold at a price that maximizes the amount to be received or the liability transferred at a price that minimizes the amount to be paid). In the absence of observable market transactions, we consider liquidity valuation adjustments to reflect the uncertainty in pricing the instruments.
In measuring the fair value of an asset, we assume the highest and best use of the asset by a market participant — not just the intended use — to maximize the value of the asset. We also consider whether any credit valuation adjustments are necessary based on the counterparty’s credit quality.
When measuring the fair value of a liability, we assume that the transfer will not affect the associated nonperformance risk. Nonperformance risk is the risk that an obligation will not be satisfied, and encompasses not only our own credit risk (i.e., the risk that we will fail to meet our obligation), but also other risks such as settlement risk (i.e., the risk that upon termination or sale, the contract will not settle). We consider the effect of our own credit risk on the fair value for any period in which fair value is measured.
There are three acceptable techniques for measuring fair value: the market approach, the income approach and the cost approach. The appropriate technique for valuing a particular asset or liability depends on the exit market, the nature of the asset or liability being valued, and how a market participant would value the same asset or liability. Ultimately, selecting the appropriate valuation method requires significant judgment, and applying the valuation technique requires sufficient knowledge and expertise.
Valuation inputs refer to the assumptions market participants would use in pricing a given asset or liability. Inputs can be observable or unobservable. Observable inputs are assumptions based on market data obtained from an independent source. Unobservable inputs are assumptions based on our own information or assessment of assumptions used by other market participants in pricing the asset or liability. Our unobservable inputs are based on the best and most current information available on the measurement date.
All inputs, whether observable or unobservable, are ranked in accordance with a prescribed fair value hierarchy that gives the highest ranking to quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest ranking to unobservable inputs (Level 3). Fair values for Level 2 assets or liabilities are based on one or a combination of the following factors: (i) quoted market prices for similar assets or liabilities; (ii) observable inputs, such as interest rates or yield curves; or (iii) inputs derived principally from or corroborated by observable market data. The level in the fair value hierarchy ascribed to a fair value measurement in its entirety is based on the lowest level input that is significant to the measurement. We consider an input to be significant if it drives 10% or more of the total fair value of a particular asset or liability. Assets and liabilities may transfer between levels based on the observable and unobservable inputs used at the valuation date, as the inputs may be influenced by certain market conditions. We recognize transfers between levels of the fair value hierarchy at the end of the reporting period.
Typically, assets and liabilities are considered to be fair valued on a recurring basis if fair value is measured regularly. However, if the fair value measurement of an instrument does not necessarily result in a change in the amount recorded on the balance sheet, assets and liabilities are considered to be fair valued on a nonrecurring basis. This generally occurs when we apply accounting guidance that requires assets and liabilities to be recorded at the lower of cost or fair value, or assessed for impairment.
At a minimum, we conduct our valuations quarterly. Additional information regarding fair value measurements and disclosures is provided in Note 6 (“Fair Value Measurements”).
Trading Account Assets
Trading account assets are debt and equity securities, as well as commercial loans that we purchase and hold but intend to sell in the near term. These assets are reported at fair value. Realized and unrealized gains and losses on trading account assets are reported in “investment banking and capital markets income (loss)” on the income statement.
Securities
Securities available for sale.  These are securities that we intend to hold for an indefinite period of time but that may be sold in response to changes in interest rates, prepayment risk, liquidity needs or other factors. Securities available for sale are reported at fair value. Unrealized gains and losses (net of income taxes) deemed temporary are recorded in equity as a component of AOCI on the balance sheet. Unrealized losses on equity securities deemed “other-than-temporary,” and realized gains and losses resulting from sales of securities using the specific identification method, are included in “net securities gains (losses)” on the income statement. Unrealized losses on debt securities deemed “other-than-temporary” are included in “net securities gains (losses)” on the income statement or in AOCI in accordance with the applicable accounting guidance, as further described under the heading “Other-than-Temporary Impairments” in this note and in Note 7 (“Securities”).
“Other securities” held in the available-for-sale portfolio are primarily marketable equity securities that are traded on a public exchange such as the NYSE or NASDAQ.
Held-to-maturity securities.  These are debt securities that we have the intent and ability to hold until maturity. Debt securities are carried at cost and adjusted for amortization of premiums and accretion of discounts using the interest method. This method produces a constant rate of return on the adjusted carrying amount.
“Other securities” held in the held-to-maturity portfolio consist of foreign bonds and capital securities.
Other-than-Temporary Impairments
If the amortized cost of a debt security is greater than its fair value and we intend to sell it, or more-likely-than-not will be required to sell it, before the expected recovery of the amortized cost, then the entire impairment is recognized in earnings. If we have no intent to sell the security, or it is more-likely-than-not that we will not be required to sell it, before expected recovery, then the credit portion of the impairment is recognized in earnings, while the remaining portion attributable to factors such as liquidity and interest rate changes is recognized in equity as a component of AOCI on the balance sheet. The credit portion is equal to the difference between the cash flows expected to be collected and the amortized cost of the debt security.
Generally, if the amortized cost of an equity security is greater than its fair value, the difference is considered to be other-than-temporary.
Other Investments
Principal investments — investments in equity and mezzanine instruments made by our Principal Investing unit — represented 57% and 59% of other investments at December 31, 2013, and 2012, respectively, and included both direct investments (investments made in a particular company), and indirect investments (investments made through funds that include other investors). Principal investments are predominantly made in privately-held companies and are carried at fair value ($554 million at December 31, 2013, and $627 million at December 31, 2012). Changes in fair values and realized gains and losses on sales of principal investments are reported as “net gains (losses) from principal investing” on the income statement.
In addition to principal investments, “other investments” include other equity and mezzanine instruments, such as certain real estate-related investments that are carried at fair value, as well as other types of investments that generally are carried at cost. The carrying amounts of the investments carried at cost are adjusted for declines in value if they are considered to be other-than-temporary. These adjustments are included in “net gains (losses) from principal investing” on the income statement.
Repurchase agreements
We enter into repurchase and reverse repurchase agreements primarily to acquire securities to cover short positions, to accommodate customers’ financing needs, and to settle other securities obligations. Repurchase and reverse repurchase agreements are accounted for as collateralized financing transactions and recorded on our balance sheet at the amounts at which the securities will be subsequently sold or repurchased. The value of our repurchase and reverse repurchase agreements is based on the valuation of the underlying securities, as further described under the “Other assets and liabilities” heading in Note 6 (“Fair Value Measurements”). Fees received in connection with these transactions are recorded in interest income; fees paid are recorded in interest expense.
Derivatives
In accordance with applicable accounting guidance, all derivatives are recognized as either assets or liabilities on the balance sheet at fair value. The net increase or decrease in derivatives is included in “other operating activities, net” within the statement of cash flows.
Accounting for changes in fair value (i.e., gains or losses) of derivatives differs depending on whether the derivative has been designated and qualifies as part of a hedge relationship, and further, on the type of hedge relationship. For derivatives that are not designated as hedging instruments, any gain or loss is recognized immediately in earnings. A derivative that is designated and qualifies as a hedging instrument must be designated as a fair value hedge, a cash flow hedge or a hedge of a net investment in a foreign operation.
A fair value hedge is used to limit exposure to changes in the fair value of existing assets, liabilities and commitments caused by changes in interest rates or other economic factors. The effective portion of a change in the fair value of an instrument designated as a fair value hedge is recorded in earnings at the same time as a change in fair value of the hedged item, resulting in no effect on net income. The ineffective portion of a change in the fair value of such a hedging instrument is recognized in “other income” on the income statement, with no corresponding offset.
A cash flow hedge is used to minimize the variability of future cash flows that is caused by changes in interest rates or other economic factors. The effective portion of a gain or loss on a cash flow hedge is recorded as a component of AOCI on the balance sheet, and reclassified to earnings in the same period in which the hedged transaction affects earnings. The ineffective portion of a cash flow hedge is included in “other income” on the income statement.
A net investment hedge is used to hedge the exposure of changes in the carrying value of investments as a result of changes in the related foreign exchange rates. The effective portion of a gain or loss on a net investment hedge is recorded as a component of AOCI on the balance sheet when the terms of the derivative match the notional and currency risk being hedged. The effective portion is subsequently reclassified into income when the hedged transaction affects earnings. The ineffective portion of a net investment hedge is included in “other income” on the income statement.
Hedge “effectiveness” is determined by the extent to which changes in the fair value of a derivative instrument offset changes in the fair value, cash flows, or carrying value attributable to the risk being hedged. If the relationship between the change in the fair value of the derivative instrument and the change in the hedged item falls within a range considered to be the industry norm, the hedge is considered “highly effective” and qualifies for hedge accounting. A hedge is “ineffective” if the relationship between the changes falls outside the acceptable range. In that case, hedge accounting is discontinued on a prospective basis. Hedge effectiveness is tested at least quarterly.
Additional information regarding the accounting for derivatives is provided in Note 8 (“Derivatives and Hedging Activities”).
Offsetting Derivative Positions
In accordance with the applicable accounting guidance, we take into account the impact of bilateral collateral and master netting agreements that allow us to settle all derivative contracts held with a single counterparty on a net basis, and to offset the net derivative position with the related cash collateral when recognizing derivative assets and liabilities. Additional information regarding derivative offsetting is provided in Note 8.
Servicing Assets
We service commercial real estate loans. Servicing assets related to all commercial real estate loan servicing totaled $332 million at December 31, 2013, and $204 million at December 31, 2012, and are included in “accrued income and other assets” on the balance sheet.
Servicing assets and liabilities purchased or retained initially are measured at fair value, if practical. When no ready market value (such as quoted market prices, or prices based on sales or purchases of similar assets) is available to determine the fair value of servicing assets, fair value is determined by calculating the present value of future cash flows associated with servicing the loans. This calculation is based on a number of assumptions, including the market cost of servicing, the discount rate, the prepayment rate and the default rate.
We remeasure our servicing assets using the amortization method at each reporting date. The amortization of servicing assets is determined in proportion to, and over the period of, the estimated net servicing income, and is recorded in “mortgage fees” on the income statement.
Servicing assets are evaluated quarterly for possible impairment. This process involves classifying the assets based on the types of loans serviced and their associated interest rates, and determining the fair value of each class. If the evaluation indicates that the carrying amount of the servicing assets exceeds their fair value, the carrying amount is reduced by recording a charge to income in the amount of such excess and establishing a valuation allowance. No impairment of servicing assets recorded for the years ended December 31, 2013, 2012, and 2011, was material in amount. Additional information pertaining to servicing assets is included in Note 9 (“Mortgage Servicing Assets”).
Business Combinations
We account for our business combinations using the acquisition method of accounting. Under this accounting method, the acquired company’s net assets are recorded at fair value at the date of acquisition, and the results of operations of the acquired company are combined with Key’s results from that date forward. Acquisition costs are expensed when incurred. The difference between the purchase price and the fair value of the net assets acquired (including intangible assets with finite lives) is recorded as goodwill. Our accounting policy for intangible assets is summarized in this note under the heading “Goodwill and Other Intangible Assets.”
Additional information regarding acquisitions is provided in Note 13 (“Acquisitions and Discontinued Operations”).
Goodwill and Other Intangible Assets
Goodwill represents the amount by which the cost of net assets acquired in a business combination exceeds their fair value. Other intangible assets primarily are the net present value of future economic benefits to be derived from the purchase of credit card receivable assets and core deposits. Other intangible assets are amortized on either an accelerated or straight-line basis over periods ranging from seven to thirty years. Goodwill and other types of intangible assets deemed to have indefinite lives are not amortized.
Relevant accounting guidance provides that goodwill and certain other intangible assets must be subjected to impairment testing at least annually. We perform quantitative goodwill impairment testing in the fourth quarter of each year. Our reporting units for purposes of this testing are our two business segments, Key Community Bank and Key Corporate Bank. Because the strength of the economic recovery remained uncertain during 2013, we continued to monitor the impairment indicators for goodwill and other intangible assets, and to evaluate the carrying amount of these assets quarterly.
The first step in goodwill impairment testing is to determine the fair value of each reporting unit. This amount is estimated using comparable external market data (market approach) and discounted cash flow modeling that incorporates an appropriate risk premium and earnings forecast information (income approach). If the carrying amount of a reporting unit exceeds its fair value, goodwill impairment may be indicated. In such a case, we would perform a second step of goodwill impairment testing, and we would estimate a hypothetical purchase price for the reporting unit (representing the unit’s fair value). Then we would compare that hypothetical purchase price with the fair value of the unit’s net assets (excluding goodwill). Any excess of the estimated purchase price over the fair value of the reporting unit’s net assets represents the implied fair value of goodwill. If the carrying amount of the reporting unit’s goodwill exceeds the implied fair value of goodwill, the impairment loss represented by this difference is charged to earnings.
Effective October 1, 2013, and on a prospective basis, the amount of capital being allocated to our reporting units as a proxy for the carrying value will be based on risk-based regulatory capital requirements. Prior year methodology utilized allocated economic equity as a proxy for the carrying value of the reporting units.
Additional information pertaining to goodwill and other intangible assets is included in Note 10 (“Goodwill and Other Intangible Assets”).
Purchased Loans
We evaluate purchased loans for impairment in accordance with the applicable accounting guidance. Purchased performing loans that do not have evidence of deterioration in credit quality at acquisition are recorded at fair value at the acquisition date. Any premium or discount associated with purchased performing loans is recognized as an expense or income based on the effective yield method of amortization. Purchased loans that have evidence of deterioration in credit quality since origination and for which it is probable, at acquisition, that all contractually required payments will not be collected, are deemed PCI. These loans are initially recorded at fair value without recording an allowance for loan losses. Fair value of these loans is determined using market participant assumptions in estimating the amount and timing of both principal and interest cash flows expected to be collected, as adjusted for an estimate of future credit losses and prepayments, and then a market-based discount rate is applied to those cash flows. PCI loans are generally accounted for on a pool basis, with pools formed based on the common characteristics of the loans, such as loan collateral type or loan product type. Each pool is accounted for as a single asset with one composite interest rate and an aggregate expectation of cash flows.
Under the accounting model for PCI loans, the excess of cash flows expected to be collected over the carrying amount of the loans, referred to as the “accretable amount,” is accreted into interest income over the life of the loans in each pool using the effective yield method. Accordingly, PCI loans are not subject to classification as nonaccrual (and nonperforming) in the same manner as originated loans. Rather, acquired PCI loans are considered to be accruing loans because their interest income relates to the accretable yield recognized at the pool level and not to contractual interest payments at the loan level. The difference between contractually required principal and interest payments and the cash flows expected to be collected, referred to as the “nonaccretable amount,” includes estimates of both the impact of prepayments and future credit losses expected to be incurred over the life of the loans in each pool.
After we acquire loans determined to be PCI loans, actual cash collections are monitored to determine if they conform to management’s expectations. Revised cash flow expectations are prepared, as necessary. A decrease in expected cash flows in subsequent periods may indicate that the loan pool is impaired, which would require us to establish an allowance for loan losses by recording a charge to the provision for loan losses. An increase in expected cash flows in subsequent periods initially reduces any previously established allowance for loan losses by the increase in the present value of cash flows expected to be collected, and require us to recalculate the amount of accretable yield for the loan pool. The adjustment of accretable yield due to an increase in expected cash flows is accounted for as a change in estimate. The additional cash flows expected to be collected are reclassified from the nonaccretable difference to the accretable yield, and the amount of periodic accretion is adjusted accordingly over the remaining life of the loans in the pool.
A purchased loan may be resolved either through receipt of payment (in full or in part) from the borrower, the sale of the loan to a third party, or foreclosure of the collateral. If the loan is sold, a gain or loss on sale is recognized and reported within noninterest income based on the difference between the sales proceeds and the carrying amount of the loan. In the case of a foreclosure, an individual loan is removed from the pool at an amount received from its resolution (fair value of the underlying collateral less costs to sell). Any difference between this amount and the loan carrying value is absorbed by the nonaccretable difference established for the entire pool. For loans resolved by payment in full, there is no difference between the amount received at resolution and the outstanding balance of the loan. In these cases, the remaining accretable amount balance is unaffected and any material change in remaining effective yield caused by removing the loan from the pool is addressed in connection with the subsequent cash flow re-assessment for the pool. PCI loans subject to modification are not removed from the pool even if those loans would otherwise be deemed TDRs since the pool, and not the individual loan, represents the unit of account.
Premises and Equipment
Premises and equipment, including leasehold improvements, are stated at cost less accumulated depreciation and amortization. We determine depreciation of premises and equipment using the straight-line method over the estimated useful lives of the particular assets. Leasehold improvements are amortized using the straight-line method over the terms of the leases. Accumulated depreciation and amortization on premises and equipment totaled $1.2 billion at December 31, 2013, and 2012.
Internally Developed Software
We rely on company personnel and independent contractors to plan, develop, install, customize and enhance computer systems applications that support corporate and administrative operations. Software development costs, such as those related to program coding, testing, configuration and installation, are capitalized and included in “accrued income and other assets” on the balance sheet. The resulting asset ($60 million at December 31, 2013, and $53 million at December 31, 2012) is amortized using the straight-line method over its expected useful life (not to exceed five years). Costs incurred during the planning and post-development phases of an internal software project are expensed as incurred.
Software that is no longer used is written off to earnings immediately. When we decide to replace software, amortization of the phased-out software is accelerated to the expected replacement date.
Guarantees
In accordance with the applicable accounting guidance, we recognize liabilities, which are included in “accrued expense and other liabilities” on the balance sheet, for the fair value of our obligations under certain guarantees issued.
If we receive a fee for a guarantee requiring liability recognition, the amount of the fee represents the initial fair value of the “stand ready” obligation. If there is no fee, the fair value of the stand ready obligation is determined using expected present value measurement techniques, unless observable transactions for comparable guarantees are available. The subsequent accounting for these stand ready obligations depends on the nature of the underlying guarantees. We account for our release from risk under a particular guarantee when the guarantee expires or is settled, or by a systematic and rational amortization method, depending on the risk profile of the guarantee.
Additional information regarding guarantees is included in Note 20 (“Commitments, Contingent Liabilities and Guarantees”) under the heading “Guarantees.”
Revenue Recognition
We recognize revenues as they are earned based on contractual terms, as transactions occur, or as services are provided and collectibility is reasonably assured. Our principal source of revenue is interest income, which is recognized on an accrual basis primarily according to nondiscretionary formulas in written contracts, such as loan agreements or securities contracts.
Stock-Based Compensation
Stock-based compensation is measured using the fair value method of accounting. The measured cost is recognized over the period during which the recipient is required to provide service in exchange for the award. We estimate expected forfeitures when stock-based awards are granted and record compensation expense only for awards that are expected to vest.
We recognize compensation cost for stock-based, mandatory deferred incentive compensation awards using the accelerated method of amortization over a period of approximately five years (the current year performance period and a four-year vesting period, which generally starts in the first quarter following the performance period) for awards granted in 2012 and after, and over a period of approximately four years (the current year performance period and a three-year vesting period, which generally starts in the first quarter following the performance period) for awards granted prior to 2012.
Employee stock options typically become exercisable at the rate of 25% per year for options granted in 2011 and after, or 33-1/3% per year for options granted prior to 2011, beginning one year after the grant date. Options expire no later than ten years after their grant date. We recognize stock-based compensation expense for stock options with graded vesting using an accelerated method of amortization.
We use shares repurchased under our annual capital plan submitted to our regulators (treasury shares) for share issuances under all stock-based compensation programs other than the discounted stock purchase plan. Shares issued under the discounted stock purchase plan are purchased on the open market.
We estimate the fair value of options granted using the Black-Scholes option-pricing model, as further described in Note 15 (“Stock-Based Compensation”).
Marketing Costs
We expense all marketing-related costs, including advertising costs, as incurred.
Accounting Guidance Adopted in 2013
Benchmark interest rate.    In July 2013, the FASB issued new accounting guidance allowing entities to designate the Federal Funds Effective Swap Rate (which is the Overnight Index Swap rate, or OIS rate, in the U.S.) as a benchmark interest rate, in addition to U.S. Treasury and LIBOR rates, for hedge accounting purposes. This new accounting guidance was effective prospectively for qualifying new or redesignated hedging relationships entered into on or after July 17, 2013 (effective July 17, 2013, for us). Note 8 (“Derivatives and Hedging Activities”) provides information regarding our use of derivatives and hedge accounting.
Reporting of amounts reclassified out of AOCI.    In February 2013, the FASB issued new accounting guidance that requires reclassifications of amounts out of AOCI to be reported in a new format. It does not require the reporting of any information that is not currently required to be disclosed under existing GAAP. This accounting guidance was effective prospectively for reporting periods beginning after December 15, 2012 (effective January 1, 2013, for us). The disclosures required by this accounting guidance are provided in Note 21 (“Accumulated Other Comprehensive Income”).
Testing indefinite-lived intangible assets for impairment.    In July 2012, the FASB issued new accounting guidance that simplifies how an entity tests indefinite-lived intangible assets other than goodwill for impairment. It permits an entity to first assess qualitative factors to determine whether further impairment testing is required. This accounting guidance was effective for annual and interim impairment tests performed for fiscal years beginning after September 15, 2012 (January 1, 2013, for us). The adoption of this accounting guidance did not have a material effect on our financial condition or results of operations.
Offsetting disclosures.    In December 2011, the FASB issued new accounting guidance that requires an entity to disclose information about offsetting and related arrangements to enable financial statement users to understand the effect of those arrangements on the entity’s financial position. In January 2013, the FASB issued new accounting guidance that clarified the scope of the guidance to include derivatives, repurchase and reverse repurchase agreements, and securities lending and borrowing transactions. This accounting guidance was effective for annual reporting periods beginning on or after January 1, 2013, and interim periods within those annual periods (effective January 1, 2013, for us). Information about our offsetting and related arrangements is provided in Note 14 (“Securities Financing Activities”).
Accounting Guidance Pending Adoption at December 31, 2013
Presentation of unrecognized tax benefits.    In July 2013, the FASB issued new accounting guidance that requires unrecognized tax benefits to be presented as a decrease in a net operating loss, similar tax loss or tax credit carryforward if certain criteria are met. This accounting guidance will be applied prospectively to unrecognized tax benefits that exist at the effective date. It will be effective for fiscal years, and interim periods within those years, beginning after December 15, 2013 (effective January 1, 2014, for us). Early adoption and/or retrospective application are permitted. The adoption of this accounting guidance is not expected to have a material effect on our financial condition or results of operations.
Investment companies.    In June 2013, the FASB issued new accounting guidance that modifies the criteria used to define an investment company. It also sets forth certain measurement and disclosure requirements for an investment company. This accounting guidance will be effective for interim and annual reporting periods in fiscal years that begin after December 15, 2013 (effective January 1, 2014, for us). Early application is prohibited. The adoption of this accounting guidance is not expected to have a material effect on our financial condition or results of operations.
Liquidation basis of accounting.    In April 2013, the FASB issued new accounting guidance that specifies when and how an entity should prepare its financial statements using the liquidation basis of accounting when liquidation is imminent, as defined in the guidance, and describes the related disclosures that should be made. This new accounting guidance will be effective for entities that determine liquidation is imminent during annual reporting periods beginning after December 15, 2013, and interim reporting periods therein (effective January 1, 2014, for us). Entities should apply the requirements prospectively from the day that liquidation becomes imminent. Early adoption is permitted.
Reporting of cumulative translation adjustments upon the derecognition of certain investments.    In March 2013, the FASB issued new accounting guidance that addresses the accounting for the cumulative translation adjustment when a parent either sells a part or all of its investment in a foreign entity, or no longer holds a controlling financial interest in a subsidiary or group of assets that is a nonprofit activity or a business within a foreign entity. This accounting guidance will be effective prospectively for reporting periods beginning after December 15, 2013 (effective January 1, 2014, for us). The adoption of this accounting guidance is not expected to have a material effect on our financial condition or results of operations.
Investments in qualified affordable housing projects.    In January 2014, the FASB issued new accounting guidance that modifies the conditions that must be met to make an election to account for investments in qualified affordable housing projects using the proportional amortization method. This accounting guidance will be effective retrospectively for reporting periods beginning after December 15, 2014 (effective January 1, 2015, for us). Early adoption is permitted. The adoption of this accounting guidance is not expected to have a material effect on our financial condition or results of operations.
Troubled debt restructurings.    In January 2014, the FASB issued new accounting guidance that clarifies the definition of when an in substance repossession or foreclosure occurs for purposes of creditor reclassification of residential real estate collateralized consumer mortgage loans by derecognizing the loan and recognizing the collateral asset. This accounting guidance will be effective for reporting periods beginning after December 15, 2014 (effective January 1, 2015, for us) and can be implemented using either a modified retrospective method or prospective method. Early adoption is permitted. The adoption of this accounting guidance is not expected to have a material effect on our financial condition or results of operations.

Earning_Per_Common_Share

Earning Per Common Share	12 Months Ended
	Dec. 31, 2013
Earnings Per Share [Abstract]	'
Earning 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 incremental shares issued for the conversion of our convertible Series A Preferred Stock, 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. For diluted earnings per share, net income available to common shareholders can be affected by the conversion of our convertible Series A Preferred Stock. Where the effect of this conversion would be dilutive, net income available to common shareholders is adjusted by the amount of preferred dividends associated with our Series A Preferred Stock. For the year ended December 31, 2013, weighted-average common shares and potential common shares outstanding included six million shares associated with common share options and other stock awards.
	Our basic and diluted earnings per common share are calculated as follows:
	Year ended December 31,
	dollars in millions, except per share amounts		2013		2012		2011
	EARNINGS
	Income (loss) from continuing operations		$	870	$	842	$	967
	Less: Net income (loss) attributable to noncontrolling interests			—		7		12
	Income (loss) from continuing operations attributable to Key			870		835		955
	Less:  Dividends on Series A Preferred Stock			23		22		23
	Cash dividends on Series B Preferred Stock			—		—		31
	Amortization of discount on Series B Preferred Stock (a)			—		—		53
	Income (loss) from continuing operations attributable to Key common shareholders			847		813		848
	Income (loss) from discontinued operations, net of taxes (b)			40		23		(35)
	Net income (loss) attributable to Key common shareholders		$	887	$	836	$	813
	WEIGHTED-AVERAGE COMMON SHARES
	Weighted-average common shares outstanding (000)			906,524		938,941		931,934
	Effect of dilutive convertible preferred stock, common stock options and other stock awards (000)			6,047		4,318		3,867
	Weighted-average common shares and potential common shares outstanding (000)			912,571		943,259		935,801
	EARNINGS PER COMMON SHARE
	Income (loss) from continuing operations attributable to Key common shareholders		$	.93	$	.87	$	.91
	Income (loss) from discontinued operations, net of taxes (b)			.04		.02		(.04)
	Net income (loss) attributable to Key common shareholders (c)			.98		.89		.87
	Income (loss) from continuing operations attributable to Key common shareholders —		$	.93	$	.86	$	.91
	assuming dilution
	Income (loss) from discontinued operations, net of taxes (b)			.04		.02		(.04)
	Net income (loss) attributable to Key common shareholders — assuming dilution (c)			.97		.89		.87
	(a)	Includes a $49 million deemed dividend recorded in the first quarter of 2011 related to the repurchase of the $2.5 billion Series B Preferred Stock.
	(b)	In April 2009, we decided to wind down the operations of Austin, a subsidiary that specialized in managing hedge fund investments for institutional customers. In September 2009, we decided to discontinue the education lending business conducted through Key Education Resources, the education payment and financing unit of KeyBank. In February 2013, we decided to sell Victory to a private equity fund. As a result of these decisions, we have accounted for these businesses as discontinued operations. For further discussion regarding the income (loss) from discontinued operations, see Note 13 (“Acquisitions and Discontinued Operations”).
	(c)	EPS may not foot due to rounding.

Restrictions_on_Cash_Dividends

Restrictions on Cash, Dividends and Lending Activities	12 Months Ended
	Dec. 31, 2013
Text Block [Abstract]	'
Restrictions on Cash, Dividends and Lending Activities	'
	3. Restrictions on Cash, Dividends and Lending Activities
	Federal law requires a depository institution to maintain a prescribed amount of cash or deposit reserve balances with its Federal Reserve Bank. KeyBank maintained average reserve balances aggregating $291 million in 2013 to fulfill these requirements.
	Capital distributions from KeyBank and other subsidiaries are our principal source of cash flows for paying dividends on our common and preferred shares, servicing our debt, and financing corporate operations. Federal banking law limits the amount of capital distributions that a bank can make to its holding company without prior regulatory approval. A national bank’s dividend-paying capacity is affected by several factors, including net profits (as defined by statute) for the two previous calendar years and for the current year, up to the date the dividend is declared.
	During 2013, KeyBank paid KeyCorp a total of $600 million in dividends; nonbank subsidiaries did not pay any cash dividends or noncash dividends to KeyCorp. As of December 31, 2013, KeyBank had fully utilized its regulatory capacity to pay dividends to KeyCorp. During 2013, KeyCorp did not make any cash capital infusions to KeyBank. At December 31, 2013, KeyCorp held $2.5 billion in short-term investments, which can be used to pay dividends to shareholders, service debt, and finance corporate operations.
	As indicated in the “Supervision and Regulation” section of Item 1 of this report under the heading “Bank transactions with affiliates,” federal law and regulation also restricts loans and advances from bank subsidiaries to their parent companies (and to nonbank subsidiaries of their parent companies), and requires those transactions to be secured.

Loans_and_Loans_Held_for_Sale

Loans and Loans Held for Sale	12 Months Ended
	Dec. 31, 2013
Text Block [Abstract]	'
Loans and Loans Held for Sale	'
	4. Loans and Loans Held for Sale
	Our loans by category are summarized as follows:
	December 31,
	in millions		2013		2012
	Commercial, financial and agricultural (a)		$	24,963	$	23,242
	Commercial real estate:
	Commercial mortgage			7,720		7,720
	Construction			1,093		1,003
	Total commercial real estate loans			8,813		8,723
	Commercial lease financing (b)			4,551		4,915
	Total commercial loans			38,327		36,880
	Residential — Prime Loans:
	Real estate — residential mortgage			2,187		2,174
	Home equity:
	Key Community Bank			10,340		9,816
	Other			334		423
	Total home equity loans			10,674		10,239
	Total residential — prime loans			12,861		12,413
	Consumer other — Key Community Bank			1,449		1,349
	Credit cards			722		729
	Consumer other:
	Marine			1,028		1,358
	Other			70		93
	Total consumer other			1,098		1,451
	Total consumer loans			16,130		15,942
	Total loans (c) (d)		$	54,457	$	52,822
	(a)	December 31, 2013, and December 31, 2012, loan balances include $94 million and $90 million of commercial credit card balances, respectively.
	(b)	December 31, 2013, commercial lease financing includes receivables of $58 million held as collateral for a secured borrowing. Additional information pertaining to this secured borrowing is included in Note 18 (“Long-Term Debt”).
	(c)	December 31, 2013, total loans include purchased loans of $166 million, of which $16 million were PCI loans. December 31, 2012, total loans include purchased loans of $217 million, of which $23 million were PCI loans.
	(d)	Excludes loans in the amount of $4.5 billion at December 31, 2013, and $5.2 billion at December 31, 2012, related to the discontinued operations of the education lending business.
	We use interest rate swaps, which modify the repricing characteristics of certain loans, to manage interest rate risk. For more information about such swaps, see Note 8 (“Derivatives and Hedging Activities”).
	Our loans held for sale by category are summarized as follows:
	December 31,
	in millions		2013		2012
	Commercial, financial and agricultural		$	278	$	29
	Real estate — commercial mortgage			307		477
	Commercial lease financing			9		8
	Real estate — residential mortgage			17		85
	Total loans held for sale		$	611	$	599
	Our summary of changes in loans held for sale follows:
	Year ended December 31,
	in millions		2013		2012
	Balance at beginning of the period		$	599	$	728
	New originations			5,452		5,209
	Transfers from held to maturity, net			52		77
	Loan sales			(5,480)		(5,391)
	Loan draws (payments), net			(12)		(20)
	Transfers to OREO / valuation adjustments			—		(4)
	Balance at end of period		$	611	$	599
	Commercial and consumer leasing financing receivables primarily are direct financing leases, but also include leveraged leases. The composition of the net investment in direct financing leases is as follows:
	December 31,
	in millions		2013		2012
	Direct financing lease receivables		$	3,176	$	3,429
	Unearned income			(219)		(260)
	Unguaranteed residual value			231		261
	Deferred fees and costs			21		25
	Net investment in direct financing leases		$	3,209	$	3,455
	At December 31, 2013, minimum future lease payments to be received are as follows: 2014 — $1.1 billion; 2015 — $853 million; 2016 — $515 million; 2017 — $287 million; 2018 — $134 million; and all subsequent years — $173 million. The allowance related to lease financing receivables is $62 million at December 31, 2013.

Asset_Quality

Asset Quality	12 Months Ended
	Dec. 31, 2013
Receivables [Abstract]	'
Asset Quality	'
	5. Asset Quality
	We assess the credit quality of the loan portfolio by monitoring net credit losses, levels of nonperforming assets and delinquencies, and credit quality ratings as defined by management.
	Our nonperforming assets and past due loans were as follows:
	December 31,
	in millions		2013			2012
	Total nonperforming loans (a), (b)		$	508		$	674
	Nonperforming loans held for sale			1			25
	OREO			15			22
	Other nonperforming assets			7			14
	Total nonperforming assets		$	531		$	735
	Nonperforming assets from discontinued operations — education lending (c)		$	25		$	20
	Restructured loans included in nonperforming loans (a)		$	214		$	249
	Restructured loans with an allocated specific allowance (d)			71			114
	Specifically allocated allowance for restructured loans (e)			35			33
	Accruing loans past due 90 days or more		$	71		$	78
	Accruing loans past due 30 through 89 days			318			424
	(a)	December 31, 2012, loan balance includes $72 million of current, paying as originally agreed, secured loans that were discharged through Chapter 7 bankruptcy and not formally re-affirmed, as addressed in updated regulatory guidance issued in the third quarter of 2012. Such loans have been designated as nonperforming and TDRs.
	(b)	December 31, 2013, and December 31, 2012, loan balances exclude $16 million and $23 million of PCI loans, respectively.
	(c)	Includes restructured loans of approximately $13 million and $3 million at December 31, 2013, and December 31, 2012, respectively. See Note 13 (“Acquisitions and Discontinued Operations”) for further discussion.
	(d)	Included in individually impaired loans allocated a specific allowance.
	(e)	Included in allowance for individually evaluated impaired loans.
	We evaluate purchased loans for impairment in accordance with the applicable accounting guidance. Purchased loans that have evidence of deterioration in credit quality since origination and for which it is probable, at acquisition, that all contractually required payments will not be collected are deemed PCI and initially recorded at fair value without recording an allowance for loan losses. At the date of acquisition, the estimated gross contractual amount receivable of PCI loans totaled $41 million. The estimated cash flows not expected to be collected (the nonaccretable amount) were $11 million, and the accretable amount was approximately $5 million. The difference between the fair value and the cash flows expected to be collected from the purchased loans is accreted to interest income over the remaining term of the loans.
	At December 31, 2013, the outstanding unpaid principal balance and carrying value of all PCI loans was $24 million and $16 million, respectively. Changes in the accretable yield during 2013 included accretion of $2 million and net reclassifications of $3 million, resulting in an ending balance of $5 million at December 31, 2013.
	At December 31, 2013, the approximate carrying amount of our commercial nonperforming loans outstanding represented 57% of their original contractual amount, total nonperforming loans outstanding represented 72% of their original contractual amount owed, and nonperforming assets in total were carried at 70% of their original contractual amount.
	At December 31, 2013, our twenty largest nonperforming loans totaled $86 million, representing 17% of total loans on nonperforming status from continuing operations. At December 31, 2012, the twenty largest nonperforming loans totaled $179 million, representing 27% of total loans on nonperforming status.
	Nonperforming loans and loans held for sale reduced expected interest income by $23 million for the year ended December 31, 2013, and $25 million for the year ended December 31, 2012.
	The following tables set forth a further breakdown of individually impaired loans as of December 31, 2013, and December 31, 2012:
	December 31, 2013		Recorded			(a)		Unpaid				(b)	Specific			Average
	in millions		Investment					Principal					Allowance			Recorded
								Balance								Investment
	With no related allowance recorded:
	Commercial, financial and agricultural		$	33				$	69					—		$	33
	Commercial real estate:
	Commercial mortgage			21					25					—			55
	Construction			48					131					—			48
	Total commercial real estate loans			69					156					—			103
	Total commercial loans with no related allowance recorded			102					225					—			136
	Real estate — residential mortgage			27					27					—			24
	Home equity:
	Key Community Bank			67					67					—			66
	Other			2					2					—			2
	Total home equity loans			69					69					—			68
	Consumer other:
	Marine			3					3					—			2
	Total consumer other			3					3					—			2
	Total consumer loans			99					99					—			94
	Total loans with no related allowance recorded			201					324					—			230
	With an allowance recorded:
	Commercial, financial and agricultural			17					20				$	8			25
	Commercial real estate:
	Commercial mortgage			6					6					2			7
	Construction			2					12					—			1
	Total commercial real estate loans			8					18					2			8
	Total commercial loans with an allowance recorded			25					38					10			33
	Real estate — residential mortgage			29					29					9			23
	Home equity:
	Key Community Bank			35					35					10			29
	Other			10					11					1			9
	Total home equity loans			45					46					11			38
	Consumer other — Key Community Bank			3					3					1			2
	Credit cards			5					5					1			3
	Consumer other:
	Marine			49					49					10			55
Other			1					1					—			1
Total consumer other			50					50					10			56
Total consumer loans			132					133					32			122
Total loans with an allowance recorded			157					171					42			155
Total		$	358				$	495				$	42		$	385
(a)	The Recorded Investment represents the face amount of the loan increased or decreased by applicable accrued interest, net deferred loan fees and costs, and unamortized premium or discount, and reflects direct charge-offs. This amount is a component of total loans on our consolidated balance sheet.
(b)	The Unpaid Principal Balance represents the customer’s legal obligation to us.
December 31, 2012		Recorded			(a)		Unpaid				(b)	Specific			Average
in millions		Investment					Principal					Allowance			Recorded
							Balance								Investment
With no related allowance recorded:
Commercial, financial and agricultural		$	32				$	64					—		$	60
Commercial real estate:
Commercial mortgage			89					142					—			95
Construction			48					182					—			39
Total commercial real estate loans			137					324					—			134
Total commercial loans with no related allowance recorded			169					388					—			194
Real estate — residential mortgage			21					21					—			10
Home equity:
Key Community Bank			65					65					—			33
Other			3					3					—			1
Total home equity loans			68					68					—			34
Total consumer loans			89					89					—			44
Total loans with no related allowance recorded			258					477					—			238
With an allowance recorded:
Commercial, financial and agricultural			33					42				$	12			48
Commercial real estate:
Commercial mortgage			7					7					1			51
Construction			—					—					—			6
Total commercial real estate loans			7					7					1			57
Total commercial loans with an allowance recorded			40					49					13			105
Real estate — residential mortgage			17					17					1			8
Home equity:
Key Community Bank			22					22					11			11
Other			9					9					1			5
Total home equity loans			31					31					12			16
Consumer other — Key Community Bank			2					2					2			1
Credit cards			2					2					—			1
Consumer other:
Marine			60					60					7			30
Other			1					1					—			1
Total consumer other			61					61					7			31
Total consumer loans			113					113					22			57
Total loans with an allowance recorded			153					162					35			162
Total		$	411				$	639				$	35		$	400
(a)	The Recorded Investment represents the face amount of the loan increased or decreased by applicable accrued interest, net deferred loan fees and costs, and unamortized premium or discount, and reflects direct charge-offs. This amount is a component of total loans on our consolidated balance sheet.
(b)	The Unpaid Principal Balance represents the customer’s legal obligation to us.
For the years ended December 31, 2013, and 2012, interest income recognized on the outstanding balances of accruing impaired loans totaled $6 million and $5 million, respectively.
At December 31, 2013, aggregate restructured loans (accrual and nonaccrual loans) totaled $338 million, compared to $320 million at December 31, 2012. We added $182 million in restructured loans during 2013, which were offset by $164 million in payments and charge-offs.
A further breakdown of TDRs included in nonperforming loans by loan category as of December 31, 2013, follows:
December 31, 2013		Number			Pre-modification				Post-modification
dollars in millions		of loans			Outstanding				Outstanding
					Recorded				Recorded
					Investment				Investment
LOAN TYPE
Nonperforming:
Commercial, financial and agricultural			33		$	72			$	34
Commercial real estate:
Real estate — commercial mortgage			11			41				14
Real estate — construction			6			19				4
Total commercial real estate loans			17			60				18
Total commercial loans			50			132				52
Real estate — residential mortgage			676			43				43
Home equity:
Key Community Bank			1,708			91				86
Other			227			6				6
Total home equity loans			1,935			97				92
Consumer other — Key Community Bank			49			2				1
Credit cards			629			5				4
Consumer other:
Marine			360			24				21
Other			50			1				1
Total consumer other			410			25				22
Total consumer loans			3,699			172				162
Total nonperforming TDRs			3,749			304				214
Prior-year accruing (a)
Commercial, financial and agricultural			50			7				3
Commercial real estate:
Real estate — commercial mortgage			4			18				10
Real estate — construction			1			23				42
Total commercial real estate loans			5			41				52
Total commercial loans			55			48				55
Real estate — residential mortgage			119			12				12
Home equity:
Key Community Bank			161			17				17
Other			212			7				6
Total home equity loans			373			24				23
Consumer other — Key Community Bank			31			1				1
Credit cards			240			2				1
Consumer other:
Marine			272			51				31
Other			54			1				1
Total consumer other			326			52				32
Total consumer loans			1,089			91				69
Total prior-year accruing TDRs			1,144			139				124
Total TDRs			4,893		$	443			$	338
(a)	All TDRs that were restructured prior to January 1, 2013, and are fully accruing.
A further breakdown of TDRs included in nonperforming loans by loan category as of December 31, 2012, follows:
December 31, 2012		Number			Pre-modification				Post-modification
dollars in millions		of loans			Outstanding				Outstanding
					Recorded				Recorded
					Investment				Investment
LOAN TYPE
Nonperforming:
Commercial, financial and agricultural			82		$	76			$	39
Commercial real estate:
Real estate — commercial mortgage			15			62				25
Real estate — construction			8			53				33
Total commercial real estate loans			23			115				58
Total commercial loans			105			191				97
Real estate — residential mortgage			372			28				28
Home equity:
Key Community Bank			1,577			87				82
Other			322			9				8
Total home equity loans			1,899			96				90
Consumer other — Key Community Bank			28			1				1
Credit cards			405			3				3
Consumer other:
Marine			251			30				29
Other			34			1				1
Total consumer other			285			31				30
Total consumer loans			2,989			159				152
Total nonperforming TDRs			3,094			350				249
Prior-year accruing (a)
Commercial, financial and agricultural			122			12				6
Commercial real estate:
Real estate — commercial mortgage			4			22				15
Total commercial real estate loans			4			22				15
Total commercial loans			126			34				21
Real estate — residential mortgage			101			10				10
Home equity:
Key Community Bank			76			5				5
Other			84			3				3
Total home equity loans			160			8				8
Consumer other — Key Community Bank			16			—				—
Consumer other:
Marine			117			31				31
Other			43			1				1
Total consumer other			160			32				32
Total consumer loans			437			50				50
Total prior-year accruing TDRs			563			84				71
Total TDRs			3,657		$	434			$	320
(a)	All TDRs that were restructured prior to January 1, 2012, and are fully accruing.
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. All commercial and consumer loan TDRs, regardless of size, are individually evaluated for impairment to determine the probable loss content and are assigned a specific loan allowance if deemed appropriate. This designation has the effect of moving the loan from the general reserve methodology (i.e., collectively evaluated) to the specific reserve methodology (i.e. individually evaluated) and may impact the ALLL through a charge-off or increased loan loss provision. These components affect the ultimate allowance level. Additional information regarding TDRs for discontinued operations is provided in Note 13 (“Acquisitions and Discontinued Operations”).
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. There were 672 consumer loan TDRs with a combined recorded investment of $31 million that experienced payment defaults during the year ended December 31, 2013, from modifications resulting in TDR status during 2012. As TDRs are individually evaluated for impairment under the specific reserve methodology, subsequent defaults do not generally have a significant additional impact on the ALLL. There were no significant payment defaults during 2013 arising from commercial loans that were designated as TDRs during 2012. There were no significant payment defaults during 2012 arising from commercial or consumer loans that were designated as TDRs during 2011.
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. Our concession types are primarily interest rate reductions, forgiveness of principal and other modifications. Other modification of loan terms for consumer TDRs include those made under the terms of updated regulatory guidance issued in the third quarter of 2012.
The following table shows the concession types for our commercial and consumer accruing and nonaccruing TDRs and other selected financial data.
December 31,		2013			2012
in millions
Commercial loans:
Interest rate reduction		$	95		$	104
Forgiveness of principal			5			7
Other modification of loan terms			7			7
Total		$	107		$	118
Consumer loans:
Interest rate reduction		$	130		$	122
Forgiveness of principal			5			6
Other modification of loan terms			96			74
Total		$	231		$	202
Total commercial and consumer TDRs (a)		$	338		$	320
Total loans			54,457			52,822
(a)	Commitments outstanding to lend additional funds to borrowers whose loan terms have been modified in TDRs are $15 million and $32 million at December 31, 2013, and December 31, 2012, respectively.
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.”
At December 31, 2013, approximately $53.5 billion, or 98.3%, of our total loans are current. At December 31, 2013, total past due loans and nonperforming loans of $897 million represent approximately 1.7% of total loans.
The following aging analysis as of December 31, 2013, and December 31, 2012, of past due and current loans provides further information regarding Key’s credit exposure.
December 31, 2013		Current			30-59				60-89			90 and Greater			Nonperforming		Total Past Due			Purchased		Total
in millions					Days Past				Days Past			Days Past			Loans		and			Credit		Loans
					Due				Due			Due					Nonperforming			Impaired
																	Loans
LOAN TYPE
Commercial, financial and agricultural		$	24,823		$	39			$	8		$	16		$	77	$	140			—	$	24,963
Commercial real estate:
Commercial mortgage			7,638			20				7			17			37		81		$	1		7,720
Construction			1,068			10				—			1			14		25			—		1,093
Total commercial real estate loans			8,706			30				7			18			51		106			1		8,813
Commercial lease financing			4,463			32				33			4			19		88			—		4,551
Total commercial loans		$	37,992		$	101			$	48		$	38		$	147	$	334		$	1	$	38,327
Real estate — residential mortgage		$	2,038		$	19			$	5		$	4		$	107	$	135		$	14	$	2,187
Home equity:
Key Community Bank			10,038			51				31			14			205		301			1		10,340
Other			308			6				4			1			15		26			—		334
Total home equity loans			10,346			57				35			15			220		327			1		10,674
Consumer other — Key Community Bank			1,426			8				5			7			3		23			—		1,449
Credit cards			698			11				5			4			4		24			—		722
Consumer other:
Marine			979			15				6			2			26		49			—		1,028
Other			65			2				1			1			1		5			—		70
Total consumer other			1,044			17				7			3			27		54			—		1,098
Total consumer loans		$	15,552		$	112			$	57		$	33		$	361	$	563		$	15	$	16,130
Total loans		$	53,544		$	213			$	105		$	71		$	508	$	897		$	16	$	54,457
December 31, 2012		Current			30-59				60-89			90 and Greater			Nonperforming		Total Past Due			Purchased		Total
in millions					Days Past				Days Past			Days Past			Loans (a)		and			Credit		Loans
					Due				Due			Due					Nonperforming			Impaired
																	Loans
LOAN TYPE
Commercial, financial and agricultural		$	23,030		$	56			$	34		$	22		$	99	$	211		$	1	$	23,242
Commercial real estate:
Commercial mortgage			7,556			21				11			9			120		161			3		7,720
Construction			943			1				2			1			56		60			—		1,003
Total commercial real estate loans			8,499			22				13			10			176		221			3		8,723
Commercial lease financing			4,772			88				31			8			16		143			—		4,915
Total commercial loans		$	36,301		$	166			$	78		$	40		$	291	$	575		$	4	$	36,880
Real estate — residential mortgage		$	2,023		$	16			$	10		$	6		$	103	$	135		$	16	$	2,174
Home equity:
Key Community Bank			9,506			54				26			17			210		307			3		9,816
Other			387			9				4			2			21		36			—		423
Total home equity loans			9,893			63				30			19			231		343			3		10,239
Consumer other — Key Community Bank			1,325			9				5			8			2		24			—		1,349
Credit cards			706			7				5			—			11		23			—		729
Consumer other:
Marine			1,288			23				9			4			34		70			—		1,358
Other			87			2				1			1			2		6			—		93
Total consumer other			1,375			25				10			5			36		76			—		1,451
Total consumer loans		$	15,322		$	120			$	60		$	38		$	383	$	601		$	19	$	15,942
Total loans		$	51,623		$	286			$	138		$	78		$	674	$	1,176		$	23	$	52,822
(a)	Includes $72 million of performing secured loans that were discharged through Chapter 7 bankruptcy and not formally re-affirmed, as addressed in updated regulatory guidance issued in the third quarter of 2012. Such loans have been designated as nonperforming and TDRs.
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 regulatory risk ratings assigned for the consumer loan portfolios.
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 reevaluated 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.
Credit quality indicators for loans are updated on an ongoing basis. Bond rating classifications are indicative of the credit quality of our commercial loan portfolios and are determined by converting our internally assigned risk rating grades to bond rating categories. Payment activity and the regulatory classifications of pass and substandard are indicators of the credit quality of our consumer loan portfolios.
Credit quality indicators for our commercial and consumer loan portfolios, excluding $16 million and $23 million of PCI loans at December 31, 2013, and 2012, respectively, based on bond rating, regulatory classification and payment activity as of December 31, 2013, and 2012, are as follows:
Commercial Credit Exposure
Credit Risk Profile by Creditworthiness Category (a)
December 31,
in millions
		Commercial, financial and							RE — Commercial						RE — Construction					Commercial Lease				Total
		agricultural
RATING (b), (c)			2013			2012				2013			2012			2013		2012			2013		2012		2013		2012
AAA — AA		$	402		$	200			$	2		$	1		$	1	$	1		$	656	$	554	$	1,061	$	756
A			882			607				56			77			1		1			631		978		1,570		1,663
BBB — BB			22,368			20,834				7,129			6,549			920		783			3,080		3,118		33,497		31,284
B			521			787				282			456			32		20			117		175		952		1,438
CCC — C			790			813				250			634			139		198			67		90		1,246		1,735
Total		$	24,963		$	23,241			$	7,719		$	7,717		$	1,093	$	1,003		$	4,551	$	4,915	$	38,326	$	36,876
(a)	Credit quality indicators are updated on an ongoing basis and reflect credit quality information as of the dates indicated.
(b)	Our bond rating to internal loan grade conversion system is as follows: AAA - AA =, A =, BBB - BB = - 13, B =4 - 16, and CCC - C =7 - 20.
(c)	Our internal loan grade to regulatory-defined classification is as follows: Pass =-16, Special Mention =7, Substandard =8, Doubtful =9, and Loss =0.
Consumer Credit Exposure
Credit Risk Profile by Regulatory Classifications (a), (b)
December 31,
in millions
		Residential — Prime
GRADE			2013			2012
Pass		$	12,500		$	12,035
Substandard			346			359
Total		$	12,846		$	12,394
Credit Risk Profile Based on Payment Activity (a), (b)
December 31,		Consumer — Key							Credit cards						Consumer — Marine					Consumer — Other				Total
		Community Bank
in millions			2013			2012				2013			2012			2013		2012			2013		2012		2013		2012
Performing		$	1,446		$	1,347			$	718		$	718		$	1,002	$	1,324		$	69	$	91	$	3,235	$	3,480
Nonperforming			3			2				4			11			26		34			1		2		34		49
Total		$	1,449		$	1,349			$	722		$	729		$	1,028	$	1,358		$	70	$	93	$	3,269	$	3,529
(a)	Credit quality indicators are updated on an ongoing basis and reflect credit quality information as of the dates indicated.
(b)	Our past due payment activity to regulatory classification conversion is as follows: pass =ess than 90 days; and substandard =0 days and greater plus nonperforming loans.
We determine 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.” We apply expected loss rates to existing loans with similar risk characteristics as noted in the credit quality indicator table above and exercise judgment to assess the impact of factors such as changes in economic conditions, changes in credit policies or underwriting standards, and changes in the level of credit risk associated with specific industries and markets.
For all commercial and consumer loan TDRs, regardless of size, as well as impaired commercial loans with an outstanding balance of $2.5 million and greater, we conduct further analysis to determine the probable loss content and assign a specific allowance to the loan if deemed appropriate. We estimate the extent of the individual impairment for commercial loans and TDRs by comparing the recorded investment of the loan with the estimated present value of its future cash flows, the fair value of its underlying collateral, or the loan’s observable market price. Secured consumer loan TDRs that are discharged through Chapter 7 bankruptcy and not formally re-affirmed are adjusted to reflect the fair value of the underlying collateral, less costs to sell. Other consumer loan TDRs are combined in homogenous pools and assigned a specific allocation based on the estimated present value of future cash flows using the effective interest rate. A specific allowance also may be assigned — even when sources of repayment appear sufficient — if we remain uncertain about whether the loan will be repaid in full. On at least a quarterly basis, we evaluate the appropriateness of our loss estimation methods to reduce differences between estimated incurred losses and actual losses. The ALLL at December 31, 2013, represents our best estimate of the probable credit losses inherent in the loan portfolio at that date.
Although quantitative modeling factors such as default probability and expected recovery rates are constantly changing as the financial strength of the borrower and overall economic conditions change, we have not changed the accounting policies or methodology that we use to estimate the ALLL.
Commercial loans generally are charged off in full or charged down to the fair value of the underlying collateral when the borrower’s payment is 180 days past due. Most consumer loans are charged off when payments are 120 days past due. Home equity and residential mortgage loans generally are charged down to the fair value of the underlying collateral when payment is 180 days past due. Credit card loans, and similar unsecured products, are charged off when payments are 180 days past due.
At December 31, 2013, the ALLL was $848 million, or 1.56% of loans, compared to $888 million, or 1.68% of loans, at December 31, 2012. At December 31, 2013, the ALLL was 166.9% of nonperforming loans, compared to 131.8% at December 31, 2012.
A summary of the ALLL at the end of the past three years is presented in the table below:
in millions		2013			2012				2011
Balance at beginning of period — continuing operations		$	888		$	1,004			$	1,604
Charge-offs			(308	)		(508	)			(715	)
Recoveries			140			163				174
Net loans and leases charged off			(168	)		(345	)			(541	)
Provision for loan and lease losses from continuing operations			130			229				(60	)
Foreign currency translation adjustment			(2	)		—				1
Balance at end of period — continuing operations		$	848		$	888			$	1,004
The changes in the ALLL by loan category for the periods indicated are as follows:
		December 31,													December 31,
in millions		2012			Provision				Charge-offs			Recoveries			2013
Commercial, financial and agricultural		$	327		$	58			$	(62	)	$	39		$	362
Real estate — commercial mortgage			198			(40	)			(20	)		27			165
Real estate — construction			41			(20	)			(3	)		14			32
Commercial lease financing			55			19				(27	)		15			62
Total commercial loans			621			17				(112	)		95			621
Real estate — residential mortgage			30			25				(20	)		2			37
Home equity:
Key Community Bank			105			31				(62	)		10			84
Other			25			—				(20	)		6			11
Total home equity loans			130			31				(82	)		16			95
Consumer other — Key Community Bank			38			15				(31	)		7			29
Credit cards			26			35				(30	)		3			34
Consumer other:
Marine			39			4				(29	)		15			29
Other			4			1				(4	)		2			3
Total consumer other:			43			5				(33	)		17			32
Total consumer loans			267			111				(196	)		45			227
Total ALLL — continuing operations			888			128	(a)			(308	)		140			848
Discontinued operations			55			21				(55	)		18			39
Total ALLL — including discontinued operations		$	943		$	149				$        (363	)	$	158		$	887
(a)	Includes $2 million of foreign currency translation adjustment.
		December 31,													December 31,
in millions		2011			Provision				Charge-offs			Recoveries			2012
Commercial, financial and agricultural		$	334		$	10			$	(80	)	$	63		$	327
Real estate — commercial mortgage			272			5				(102	)		23			198
Real estate — construction			63			(3	)			(24	)		5			41
Commercial lease financing			78			(18	)			(27	)		22			55
Total commercial loans			747			(6	)			(233	)		113			621
Real estate — residential mortgage			37			17				(27	)		3			30
Home equity:
Key Community Bank			103			90				(99	)		11			105
Other			29			26				(35	)		5			25
Total home equity loans			132			116				(134	)		16			130
Consumer other — Key Community Bank			41			29				(38	)		6			38
Credit cards			—			37				(11	)		—			26
Consumer other:
Marine			46			30				(59	)		22			39
Other			1			6				(6	)		3			4
Total consumer other:			47			36				(65	)		25			43
Total consumer loans			257			235				(275	)		50			267
Total ALLL — continuing operations			1,004			229				(508	)		163			888
Discontinued operations			104			9				(75	)		17			55
Total ALLL — including discontinued operations		$	1,108		$	238				$        (583	)	$	180		$	943
		December 31,													December 31,
in millions		2010			Provision				Charge-offs			Recoveries			2011
Commercial, financial and agricultural		$	485		$	(32	)		$	(169	)	$	50		$	334
Real estate — commercial mortgage			416			(41	)			(113	)		10			272
Real estate — construction			145			(26	)			(83	)		27			63
Commercial lease financing			175			(80	)			(42	)		25			78
Total commercial loans			1,221			(179	)			(407	)		112			747
Real estate — residential mortgage			49			14				(29	)		3			37
Home equity:
Key Community Bank			120			72				(100	)		11			103
Other			57			13				(45	)		4			29
Total home equity loans			177			85				(145	)		15			132
Consumer other — Key Community Bank			57			21				(45	)		8			41
Consumer other:
Marine			89			5				(80	)		32			46
Other			11			(5	)			(9	)		4			1
Total consumer other:			100			—				(89	)		36			47
Total consumer loans			383			120				(308	)		62			257
Total ALLL — continuing operations			1,604			(59	)(a)			(715	)		174			1,004
Discontinued operations			114			113				(138	)		15			104
Total ALLL — including discontinued operations		$	1,718		$	54			$	(853	)	$	189		$	1,108
(a)	Includes $1 million of foreign currency translation adjustment.
Our ALLL decreased by $40 million, or 5%, since 2012 primarily because of the improvement in the credit quality of our loan portfolios. The quality of new loan originations and decreasing NPLs and net loan charge-offs have resulted in a reduction in our general allowance as well. Our general allowance applies expected loss rates to our existing loans with similar risk characteristics as well as any adjustments to reflect our current assessment of qualitative factors such as changes in economic conditions, underwriting standards, and concentrations of credit. Our delinquency trends declined during 2012 and 2013 due to a modest level of loan growth, relatively stable economic conditions, and continued run-off in our exit loan portfolio, reflecting our effort to maintain a moderate enterprise risk tolerance.
For continuing operations, the loans outstanding individually evaluated for impairment totaled $358 million, with a corresponding allowance of $42 million at December 31, 2013. Loans outstanding collectively evaluated for impairment totaled $54.1 billion, with a corresponding allowance of $805 million at December 31, 2013. At December 31, 2013, PCI loans evaluated for impairment totaled $16 million, with a corresponding allowance of $1 million. There was no provision for loan and lease losses on these PCI loans during the year ended December 31, 2013.
A breakdown of the individual and collective ALLL and the corresponding loan balances as of December 31, 2013, follows:
		Allowance										Outstanding
December 31, 2013		Individually			Collectively				Purchased			Loans			Individually		Collectively			Purchased
in millions		Evaluated for			Evaluated for				Credit						Evaluated for		Evaluated for			Credit
		Impairment			Impairment				Impaired						Impairment		Impairment			Impaired
Commercial, financial and agricultural		$	8		$	354				—		$	24,963		$	50	$	24,913			—
Commercial real estate:
Commercial mortgage			2			163				—			7,720			27		7,692		$	1
Construction			—			32				—			1,093			50		1,043			—
Total commercial real estate loans			2			195				—			8,813			77		8,735			1
Commercial lease financing			—			62				—			4,551			—		4,551			—
Total commercial loans			10			611				—			38,327			127		38,199			1
Real estate — residential mortgage			9			27			$	1			2,187			56		2,117			14
Home equity:
Key Community Bank			10			74				—			10,340			102		10,237			1
Other			1			10				—			334			12		322			—
Total home equity loans			11			84				—			10,674			114		10,559			1
Consumer other — Key Community Bank			1			28				—			1,449			3		1,446			—
Credit cards			1			33				—			722			5		717			—
Consumer other:
Marine			10			19				—			1,028			52		976			—
Other			—			3				—			70			1		69			—
Total consumer other			10			22				—			1,098			53		1,045			—
Total consumer loans			32			194				1			16,130			231		15,884			15
Total ALLL — continuing operations			42			805				1			54,457			358		54,083			16
Discontinued operations			1			38				—			4,497	(a)		13		4,484	(a)		—
Total ALLL — including discontinued operations		$	43		$	843			$	1		$	58,954		$	371	$	58,567		$	16
(a)	Amount includes $2.1 billion of loans carried at fair value that are excluded from ALLL consideration.
A breakdown of the individual and collective ALLL and the corresponding loan balances as of December 31, 2012, follows:
		Allowance										Outstanding
December 31, 2012		Individually			Collectively				Purchased			Loans			Individually		Collectively			Purchased
in millions		Evaluated for			Evaluated for				Credit						Evaluated for		Evaluated for			Credit
		Impairment			Impairment				Impaired						Impairment		Impairment			Impaired
Commercial, financial and agricultural		$	12		$	314				—		$	23,242		$	65	$	23,176		$	1
Commercial real estate:
Commercial mortgage			1			198				—			7,720			96		7,621			3
Construction			—			41				—			1,003			48		955			—
Total commercial real estate loans			1			239				—			8,723			144		8,576			3
Commercial lease financing			—			55				—			4,915			—		4,915			—
Total commercial loans			13			608				—			36,880			209		36,667			4
Real estate — residential mortgage			1			29			$	1			2,174			38		2,120			16
Home equity:
Key Community Bank			11			94				—			9,816			87		9,726			3
Other			1			24				—			423			12		411			—
Total home equity loans			12			118				—			10,239			99		10,137			3
Consumer other — Key Community Bank			2			36				—			1,349			2		1,347			—
Credit cards			—			26							729			2		727			—
Consumer other:
Marine			7			32				—			1,358			60		1,298			—
Other			—			3				—			93			1		92			—
Total consumer other			7			35				—			1,451			61		1,390			—
Total consumer loans			22			244				1			15,942			202		15,721			19
Total ALLL — continuing operations			35			852				1			52,822			411		52,388			23
Discontinued operations			—			55				—			5,201	(a)		3		5,198	(a)		—
Total ALLL — including discontinued operations		$	35		$	907			$	1		$	58,023		$	414	$	57,586		$	23
(a)	Amount includes $2.5 billion of loans carried at fair value that are excluded from ALLL consideration.
The liability for credit losses inherent in lending-related unfunded commitments, such as letters of credit and unfunded loan commitments, is included in “accrued expense and other liabilities” on the balance sheet. We establish the amount of this reserve by considering both historical trends and current market conditions quarterly, or more often if deemed necessary. Our liability for credit losses on lending-related commitments has increased by $8 million since 2012 to $37 million at December 31, 2013. When combined with our ALLL, our total allowance for credit losses represented 1.63% of loans at December 31, 2013, compared to 1.74% at December 31, 2012.
Changes in the liability for credit losses on unfunded lending-related commitments are summarized as follows:
in millions		2013			2012				2011
Balance at beginning of period		$	29		$	45			$	73
Provision (credit) for losses on lending-related commitments			8			(16	)			(28	)
Balance at end of period		$	37		$	29			$	45

Fair_Value_Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2013
Fair Value Disclosures [Abstract]	'
Fair Value Measurements	'
	6. Fair Value Measurements
	Fair Value Determination
	As defined in the applicable accounting guidance, fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants in our principal market. We have established and documented our process for determining the fair values of our assets and liabilities, where applicable. Fair value is based on quoted market prices, when available, for identical or similar assets or liabilities. In the absence of quoted market prices, we determine the fair value of our assets and liabilities using valuation models or third-party pricing services. Both of these approaches rely on market-based parameters, when available, such as interest rate yield curves, option volatilities, and credit spreads, or unobservable inputs. Unobservable inputs may be based on our judgment, assumptions, and estimates related to credit quality, liquidity, interest rates, and other relevant inputs.
	Valuation adjustments, such as those pertaining to counterparty and our own credit quality and liquidity, may be necessary to ensure that assets and liabilities are recorded at fair value. Credit valuation adjustments are made when market pricing does not accurately reflect the counterparty’s or our own credit quality. We make liquidity valuation adjustments to the fair value of certain assets to reflect the uncertainty in the pricing and trading of the instruments when we are unable to observe recent market transactions for identical or similar instruments. Liquidity valuation adjustments are based on the following factors:
	¿		the amount of time since the last relevant valuation;
	¿		whether there is an actual trade or relevant external quote available at the measurement date; and
	¿		volatility associated with the primary pricing components.
	We ensure that our fair value measurements are accurate and appropriate by relying upon various controls, including:
	¿		an independent review and approval of valuation models and assumptions;
	¿		recurring detailed reviews of profit and loss; and
	¿		a validation of valuation model components against benchmark data and similar products, where possible.
	We recognize transfers between levels of the fair value hierarchy at the end of the reporting period. Quarterly, we review any changes to our valuation methodologies to ensure they are appropriate and justified, and refine our valuation methodologies if more market-based data becomes available. The Fair Value Committee, which is governed by ALCO, oversees the valuation process for all lines of business and support areas, as applicable. Various Working Groups that report to the Fair Value Committee analyze and approve the valuation methodologies used to fair value assets and liabilities managed within specific areas. The Working Groups are discussed in more detail in the qualitative disclosures within this footnote and in Note 13 (“Acquisitions and Discontinued Operations”). Formal documentation of the fair valuation methodologies is prepared by the lines of business and support areas as appropriate. The documentation details the asset or liability class and related general ledger accounts, valuation techniques, fair value hierarchy level, market participants, accounting methods, valuation methodology, group responsible for valuations, and valuation inputs.
	Additional information regarding our accounting policies for determining fair value is provided in Note 1 (“Summary of Significant Accounting Policies”) under the heading “Fair Value Measurements.”
	Qualitative Disclosures of Valuation Techniques
	Loans.  Most loans recorded as trading account assets are valued based on market spreads for similar assets since they are actively traded. Therefore, these loans are classified as Level 2 because the fair value recorded is based on observable market data for similar assets.
	Securities (trading and available for sale).  We own several types of securities, requiring a range of valuation methods:
	¿		Securities are classified as Level 1 when quoted market prices are available in an active market for the identical securities. Level 1 instruments include exchange-traded equity securities.
	¿		Securities are classified as Level 2 if quoted prices for identical securities are not available, and fair value is determined using pricing models (either by a third-party pricing service or internally) or quoted prices of similar securities. These instruments include municipal bonds; bonds backed by the U.S. government; corporate bonds; certain mortgage-backed securities; securities issued by the U.S. Treasury; money markets; and certain agency and corporate CMOs. Inputs to the pricing models include: standard inputs, such as yields, benchmark securities, bids, and offers; actual trade data (i.e., spreads, credit ratings, and interest rates) for comparable assets; spread tables; matrices; high-grade scales; and option-adjusted spreads.
	¿		Securities are classified as Level 3 when there is limited activity in the market for a particular instrument. In such cases, we use internal models based on certain assumptions to determine fair value. Our Level 3 instruments consist of certain commercial mortgage-backed securities. Our Real Estate Capital line of business is responsible for the quarterly valuation process for these securities. The methodology incorporates a loan-by-loan credit review in combination with discounting the risk-adjusted bond cash flows. A detailed credit review of the underlying loans involves a screening process using a multitude of filters to identify the highest risk loans associated with these commercial mortgage-backed securities. Each of the highest risk loans identified is re-underwritten and loan-specific defaults and recoveries are assigned. A matrix approach is used to assign an expected default and recovery percentage for the remaining loans. Bond classes are then run through a discounted cash flow analysis, taking into account the expected default and recovery percentages as well as discount rates developed by our Finance area. Inputs for the Level 3 internal models include expected cash flows from the underlying loans, which take into account expected default and recovery percentages, market research, and discount rates commensurate with current market conditions. Changes in the credit quality of the underlying loans or market discount rate would impact the value of the bonds. An increase in the underlying loan credit quality or decrease in the market discount rate would positively impact the bond value. A decrease in the underlying loan credit quality or increase in the market discount rate would negatively impact the bond value.
	The fair values of our Level 2 securities available for sale are determined by a third-party pricing service. The valuations provided by the third-party pricing service are based on observable market inputs, which include benchmark yields, reported trades, issuer spreads, benchmark securities, bids, offers, and reference data obtained from market research publications. Inputs used by the third-party pricing service in valuing CMOs and other mortgage-backed securities also include new issue data, monthly payment information, whole loan collateral performance, and “To Be Announced” prices. In valuations of securities issued by state and political subdivisions, inputs used by the third-party pricing service also include material event notices.
	On a monthly basis, we validate the pricing methodologies utilized by our third-party pricing service to ensure the fair value determination is consistent with the applicable accounting guidance and that our assets are properly classified in the fair value hierarchy. To perform this validation, we:
	¿		review documentation received from our third-party pricing service regarding the inputs used in their valuations and determine a level assessment for each category of securities;
	¿		substantiate actual inputs used for a sample of securities by comparing the actual inputs used by our third-party pricing service to comparable inputs for similar securities; and
	¿		substantiate the fair values determined for a sample of securities by comparing the fair values provided by our third-party pricing service to prices from other independent sources for the same and similar securities. We analyze variances and conduct additional research with our third-party pricing service and take appropriate steps based on our findings.
	Private equity and mezzanine investments.  Private equity and mezzanine investments consist of investments in debt and equity securities through our Real Estate Capital line of business. They include direct investments made in specific properties, as well as indirect investments made in funds that pool assets of many investors to invest in properties. There is no active market for these investments, so we employ other valuation methods.
	Private equity and mezzanine investments are classified as Level 3 assets since our judgment significantly influences the determination of fair value. Our Fund Management, Asset Management, and Accounting groups are responsible for reviewing the valuation models and determining the fair value of these investments on a quarterly basis. Direct investments in properties are initially valued based upon the transaction price. This amount is then adjusted to fair value based on current market conditions using the discounted cash flow method based on the expected investment exit date. The fair values of the assets are reviewed and adjusted quarterly. Periodically, we obtain a third-party appraisal for the investments to validate the specific inputs for determining fair value.
	Inputs used in calculating future cash flows include the cost of build-out, future selling prices, current market outlook, and operating performance of the investment. Investment income and expense assumptions are based on market inputs, such as rental/leasing rates and vacancy rates for the geographic- and property type-specific markets. For investments under construction, investment income and expense assumptions are determined using expected future build-out costs and anticipated future rental prices based on current market conditions, discount rates, holding period, the terminal cap rate and sales commissions paid in the terminal cap year. For investments that are in lease-up or are fully leased, income and expense assumptions are based on the geographic market’s current lease rates, underwritten expenses, market lease terms, and historical vacancy rates. Asset Management validates these inputs on a quarterly basis through the use of industry publications, third-party broker opinions, and comparable property sales, where applicable. Changes in the significant inputs (rental/leasing rates, vacancy rates, valuation capitalization rate, discount rate, and terminal cap rate) would significantly affect the fair value measurement. Increases in rental/leasing rates would increase fair value while increases in the vacancy rates, the valuation capitalization rate, the discount rate, and the terminal cap rate would decrease fair value.
	Consistent with accounting guidance, indirect investments are valued using a methodology that allows the use of statements from the investment manager to calculate net asset value per share. A primary input used in estimating fair value is the most recent value of the capital accounts as reported by the general partners of the funds in which we invest. The calculation to determine the investment’s fair value is based on our percentage ownership in the fund multiplied by the net asset value of the fund, as provided by the fund manager. Under the requirements of the Volcker Rule, we will be required to dispose of some or all of our indirect investments. As of December 31, 2013, management has not committed to a plan to sell these investments. Therefore, these investments continue to be valued using the net asset value per share methodology.
	Investments in real estate private equity funds are included within private equity and mezzanine investments. The main purpose of these funds is to acquire a portfolio of real estate investments that provides attractive risk-adjusted returns and current income for investors. Certain of these investments do not have readily determinable fair values and represent our ownership interest in an entity that follows measurement principles under investment company accounting. The following table presents the fair value of our indirect investments and related unfunded commitments at December 31, 2013:
	December 31, 2013		Fair Value			Unfunded
	in millions					Commitments
	INVESTMENT TYPE
	Passive funds (a)		$	11		$	1
	Co-managed funds (b)			12			—
	Total		$	23		$	1
	(a)	We invest in passive funds, which are multi-investor private equity funds. These investments can never be redeemed. Instead, distributions are received through the liquidation of the underlying investments in the funds. Some funds have no restrictions on sale, while others require investors to remain in the fund until maturity. The funds will be liquidated over a period of one to five years.
	(b)	We are a manager or co-manager of these funds. These investments can never be redeemed. Instead, distributions are received through the liquidation of the underlying investments in the funds. In addition, we receive management fees. We can sell or transfer our interest in any of these funds with the written consent of a majority of the fund’s investors. In one instance, the other co-manager of the fund must consent to the sale or transfer of our interest in the fund. The funds will mature over a period of one to four years.
	Principal investments.  Principal investments consist of investments in equity and debt instruments made by our principal investing entities. They include direct investments (investments made in a particular company) and indirect investments (investments made through funds that include other investors).
	Each investment is adjusted to fair value with any net realized or unrealized gain/loss recorded in the current period’s earnings. This process is a coordinated and documented effort by the Principal Investing Entities Deal Team (individuals from one of the independent investment managers who oversee these instruments), finance and accounting staff, and the Investment Committee (individuals from Key and one of the independent investment managers). This process involves an in-depth review of the condition of each investment depending on the type of investment.
	Our direct investments include investments in debt and equity instruments of both private and public companies. When quoted prices are available in an active market for the identical direct investment, we use the quoted prices in the valuation process, and the related investments are classified as Level 1 assets. However, in most cases, quoted market prices are not available for our direct investments, and we must perform valuations using other methods. These direct investment valuations are an in-depth analysis of the condition of each investment and are based on the unique facts and circumstances related to each individual investment. There is a certain amount of subjectivity surrounding the valuation of these investments due to the combination of quantitative and qualitative factors that are used in the valuation models. Therefore, these direct investments are classified as Level 3 assets. The specific inputs used in the valuations of each type of direct investment are described below.
	Interest-bearing securities (i.e., loans) are valued on a quarterly basis. Valuation adjustments are determined by the Principal Investing Entities Deal Team and are subject to approval by the Investment Committee. Valuations of debt instruments are based on the Principal Investing Entities Deal Team’s knowledge of the current financial status of the subject company, which is regularly monitored throughout the term of the investment. Significant unobservable inputs used in the valuations of these investments include the company’s payment history, adequacy of cash flows from operations, and current operating results, including market multiples and historical and forecast earnings before interest, taxation, depreciation, and amortization (EBITDA). Inputs can also include the seniority of the debt, the nature of any pledged collateral, the extent to which the security interest is perfected and the net liquidation value of collateral.
	Valuations of equity instruments of private companies, which are prepared on a quarterly basis, are based on current market conditions and the current financial status of each company. A valuation analysis is performed to value each investment. The valuation analysis is reviewed by the Principal Investing Entities Deal Team Member, and reviewed and approved by the Chief Administrative Officer of one of the independent investment managers. Significant unobservable inputs used in these valuations include adequacy of the company’s cash flows from operations, any significant change in the company’s performance since the prior valuation, and any significant equity issuances by the company. Equity instruments of public companies are valued using quoted prices in an active market for the identical security. If the instrument is restricted, the fair value is determined considering the number of shares traded daily, the number of the company’s total restricted shares, and price volatility.
	Our indirect investments are classified as Level 3 assets since our significant inputs are not observable in the marketplace. Indirect investments include primary and secondary investments in private equity funds engaged mainly in venture- and growth-oriented investing. These investments do not have readily determinable fair values. Indirect investments are valued using a methodology that is consistent with accounting guidance that allows us to estimate fair value based upon net asset value per share (or its equivalent, such as member units or an ownership interest in partners’ capital to which a proportionate share of net assets is attributed). The significant unobservable input used in estimating fair value is primarily the most recent value of the capital accounts as reported by the general partners of the funds in which we invest. Under the requirements of the Volcker Rule, we will be required to dispose of some or all of our indirect investments. As of December 31, 2013, management has not committed to a plan to sell these investments. Therefore, these investments continue to be valued using the net asset value per share methodology.
	For indirect investments, management may make adjustments it deems appropriate to the net asset value if it is determined that the net asset value does not properly reflect fair value. In determining the need for an adjustment to net asset value, management performs an analysis of the private equity funds based on the independent fund manager’s valuations as well as management’s own judgment. Significant unobservable inputs used in these analyses include current fund financial information provided by the fund manager, an estimate of future proceeds expected to be received on the investment, and market multiples. Management also considers whether the independent fund manager adequately marks down an impaired investment, maintains financial statements in accordance with GAAP, or follows a practice of holding all investments at cost.
	At December 31, 2013, the fair value of our indirect investments was $413 million, and the related unfunded commitments was $75 million. Our indirect investments consist of buyout funds, venture capital funds, and fund of funds. These investments can never be redeemed. Instead, distributions are received through the liquidation of the underlying investments of the fund. An investment in any one of these funds can be sold only with the approval of the fund’s general partners. We estimate that the underlying investments of the funds will be liquidated over a period of one to nine years.
	Derivatives.  Exchange-traded derivatives are valued using quoted prices and, therefore, are classified as Level 1 instruments. However, only a few types of derivatives are exchange-traded. The majority of our derivative positions are valued using internally developed models based on market convention that use observable market inputs, such as interest rate curves, yield curves, LIBOR and Overnight Index Swap (OIS) discount rates and curves, index pricing curves, foreign currency curves, and volatility surfaces (a three-dimensional graph of implied volatility against strike price and maturity). These derivative contracts, which are classified as Level 2 instruments, include interest rate swaps, certain options, cross currency swaps, and credit default swaps.
	In addition, we have several customized derivative instruments and risk participations that are classified as Level 3 instruments. These derivative positions are valued using internally developed models, with inputs consisting of available market data, such as bond spreads and asset values, as well as unobservable internally-derived assumptions, such as loss probabilities and internal risk ratings of customers. These derivatives are priced monthly by our Market Risk Management group using a credit valuation adjustment methodology. Swap details with the customer and our related participation percentage, if applicable, are obtained from our derivatives accounting system, which is the system of record. Applicable customer rating information is obtained from the particular loan system and represents an unobservable input to this valuation process. Using these various inputs, a valuation of these Level 3 derivatives is performed using a model that was acquired from a third party. In summary, the fair value represents an estimate of the amount that the risk participation counterparty would need to pay/receive as of the measurement date based on the probability of customer default on the swap transaction and the fair value of the underlying customer swap. Therefore, a higher loss probability and a lower credit rating would negatively affect the fair value of the risk participations and a lower loss probability and higher credit rating would positively affect the fair value of the risk participations.
	Market convention implies a credit rating of “AA” equivalent in the pricing of derivative contracts, which assumes all counterparties have the same creditworthiness. To reflect the actual exposure on our derivative contracts related to both counterparty and our own creditworthiness, we record a fair value adjustment in the form of a default reserve. The credit component is determined by individual counterparty based on the probability of default, and considers master netting and collateral agreements. The default reserve is classified as Level 3. Our Market Risk Management group is responsible for the valuation policies and procedure related to this default reserve. A weekly reconciliation process is performed to ensure that all applicable derivative positions are covered in the calculation, which includes transmitting customer exposures and reserve reports to trading management, derivative traders and marketers, derivatives middle office, and corporate accounting personnel. On a quarterly basis, Market Risk Management prepares the reserve calculation which includes a detailed reserve comparison with the previous quarter, an analysis for change in reserve, and a reserve forecast to ensure that the default reserve recorded at period end is sufficient.
	Other assets and liabilities.  The value of our repurchase and reverse repurchase agreements, trade date receivables and payables, and short positions is driven by the valuation of the underlying securities. The underlying securities may include equity securities, which are valued using quoted market prices in an active market for identical securities, resulting in a Level 1 classification. If quoted prices for identical securities are not available, fair value is determined by using pricing models or quoted prices of similar securities, resulting in a Level 2 classification. For the interest rate-driven products, such as government bonds, U.S. Treasury bonds and other products backed by the U.S. government, inputs include spreads, credit ratings and interest rates. For the credit-driven products, such as corporate bonds and mortgage-backed securities, inputs include actual trade data for comparable assets, and bids and offers.
	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. The following tables present these assets and liabilities at December 31, 2013, and December 31, 2012.
	December 31, 2013		Level 1			Level 2			Level 3			Total
	in millions
	ASSETS MEASURED ON A RECURRING BASIS
	Short-term investments:
	Securities purchased under resale agreements			—		$	347			—		$	347
	Trading account assets:
	U.S. Treasury, agencies and corporations			—			471			—			471
	States and political subdivisions			—			23			—			23
	Collateralized mortgage obligations			—			9			—			9
	Other mortgage-backed securities			—			120			—			120
	Other securities		$	4			108			—			112
	Total trading account securities			4			731			—			735
Commercial loans			—			3			—			3
Total trading account assets			4			734			—			738
Securities available for sale:
States and political subdivisions			—			40			—			40
Collateralized mortgage obligations			—			11,000			—			11,000
Other mortgage-backed securities			—			1,286			—			1,286
Other securities			20			—			—			20
Total securities available for sale			20			12,326			—			12,346
Other investments:
Principal investments:
Direct			—			—		$	141			141
Indirect			—			—			413			413
Total principal investments			—			—			554			554
Equity and mezzanine investments:
Direct			—			—			—			—
Indirect			—			—			23			23
Total equity and mezzanine investments			—			—			23			23
Total other investments			—			—			577			577
Derivative assets:
Interest rate			—			1,014			25			1,039
Foreign exchange			56			7			—			63
Commodity			—			112			—			112
Credit			—			1			4			5
Equity			—			—			—			—
Derivative assets			56			1,134			29			1,219
Netting adjustments (a)			—			—			—			(812	)
Total derivative assets			56			1,134			29			407
Accrued income and other assets			1			55			—			56
Total assets on a recurring basis at fair value		$	81		$	14,596		$	606		$	14,471
LIABILITIES MEASURED ON A RECURRING BASIS
Federal funds purchased and securities sold under repurchase agreements:
Securities sold under repurchase agreements			—		$	517			—		$	517
Bank notes and other short-term borrowings:
Short positions		$	2			341			—			343
Derivative liabilities:
Interest rate			—			739			—			739
Foreign exchange			49			8			—			57
Commodity			—			106			—			106
Credit			—			11		$	1			12
Equity			—			—			—			—
Derivative liabilities			49			864			1			914
Netting adjustments (a)			—			—			—			(500	)
Total derivative liabilities			49			864			1			414
Accrued expense and other liabilities			—			1			—			1
Total liabilities on a recurring basis at fair value		$	51		$	1,723		$	1		$	1,275
(a)	Netting adjustments represent the amounts recorded to convert our derivative assets and liabilities from a gross basis to a net basis in accordance with 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.
December 31, 2012		Level 1			Level 2			Level 3			Total
in millions
ASSETS MEASURED ON A RECURRING BASIS
Short term investments:
Securities purchased under resale agreements			—		$	271			—		$	271
Trading account assets:
U.S. Treasury, agencies and corporations			—			383			—			383
States and political subdivisions			—			21		$	3			24
Collateralized mortgage obligations			—			8			—			8
Other mortgage-backed securities			—			4			—			4
Other securities		$	2			175			—			177
Total trading account securities			2			591			3			596
Commercial loans			—			9			—			9
Total trading account assets			2			600			3			605
Securities available for sale:
States and political subdivisions			—			49			—			49
Collateralized mortgage obligations			—			11,464			—			11,464
Other mortgage-backed securities			—			538			—			538
Other securities			43			—			—			43
Total securities available for sale			43			12,051			—			12,094
Other investments:
Principal investments:
Direct			—			—			191			191
Indirect			—			—			436			436
Total principal investments			—			—			627			627
Equity and mezzanine investments:
Direct			—			—			—			—
Indirect			—			—			41			41
Total equity and mezzanine investments			—			—			41			41
Total other investments			—			—			668			668
Derivative assets:
Interest rate			—			1,705			19			1,724
Foreign exchange			54			21			—			75
Commodity			—			154			2			156
Credit			—			3			5			8
Equity			—			—			—			—
Derivative assets			54			1,883			26			1,963
Netting adjustments (a)			—			—			—			(1,270	)
Total derivative assets			54			1,883			26			693
Accrued income and other assets			—			3			—			3
Total assets on a recurring basis at fair value		$	99		$	14,808		$	697		$	14,334
LIABILITIES MEASURED ON A RECURRING BASIS
Federal funds purchased and securities sold under repurchase agreements:
Securities sold under repurchase agreements			—		$	228			—		$	228
Bank notes and other short-term borrowings:
Short positions			—			287			—			287
Derivative liabilities:
Interest rate			—			1,152			—			1,152
Foreign exchange		$	55			20			—			75
Commodity			—			149		$	1			150
Credit			—			9			1			10
Equity			—			—			—			—
Derivative liabilities			55			1,330			2			1,387
Netting adjustments (a)			—			—			—			(803	)
Total derivative liabilities			55			1,330			2			584
Accrued expense and other liabilities			—			49			—			49
Total liabilities on a recurring basis at fair value		$	55		$	1,894		$	2		$	1,148
(a)	Netting adjustments represent the amounts recorded to convert our derivative assets and liabilities from a gross basis to a net basis in accordance with 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.
Changes in Level 3 Fair Value Measurements
The following table shows the change in the fair values of our Level 3 financial instruments for the years ended December 31, 2013, and 2012. We mitigate the credit risk, interest rate risk, and risk of loss related to many of these Level 3 instruments by using securities and derivative positions classified as Level 1 or Level 2. Level 1 and Level 2 instruments are not included in the following table. Therefore, the gains or losses shown do not include the impact of our risk management activities.
in millions		Beginning			Gains						Purchases			Sales			Settlements			Transfers		(e)			Transfers			(e)				End of			(g)		Unrealized
		of Period			(Losses)															into					out of							Period					Gains
		Balance			Included in															Level 3					Level 3							Balance					(Losses)
					Earnings																																Included in
																																					Earnings
Year ended December 31, 2013
Trading account assets
Other mortgage-backed securities			—		$	4			(b	)		—		$	-4			—			—					—							—					—
Other securities			—			4			(b	)		—			—		$	(4	)		—					—							—				$	(1	)			(b	)
State and political subdivisions		$	3			—						—			(3	)		—			—					—							—					—
Other investments
Principal investments
Direct			191			(11	)		(c	)	$	8			(47	)		—			—					—						$	141					(23	)			(c	)
Indirect			436			58			(c	)		23			(104	)		—			—					—							413					18				(c	)
Equity and mezzanine investments
Direct			—			—						—			—			—			—					—							—					8				(c	)
Indirect			41			2			(c	)		—			—			(20	)		—					—							23					2				(c	)
Derivative instruments (a)
Interest rate			19			(10	)		(d	)		1			(2	)		—		$	46		(f	)	$	(29	)		(f	)			25					—
Commodity			1			(1	)		(d	)		—			—			—			—					—							—					—
Credit			4			(8	)		(d	)		—			—			7			—					—							3					—
in millions		Beginning			Gains						Purchases			Sales			Settlements			Transfers		(e)			Transfers			(e)		End of				(g)	Unrealized
		of Period			(Losses)															into					out of					Period					Gains
		Balance			Included in															Level 3					Level 3					Balance					(Losses)
					Earnings																														Included in
																																			Earnings
Year ended December 31, 2012
Trading account assets
Other mortgage-backed securities		$	35		$	1			(b	)		—		$	(32	)		—			—				$	(4	)				—					—
State and political subdivisions			—			3			(b	)		—			(7	)	$	(50	)	$	57		(h	)		—				$	3				$	4				(b	)
Other investments
Principal investments
Direct			225			11			(c	)	$	12			(57	)		—			—					—					191					14				(c	)
Indirect			473			52			(c	)		34			(123	)		—			—					—					436					5				(c	)
Equity and mezzanine investments
Direct			15			2			(c	)		—			—			(17	)		—					—					—					10				(c	)
Indirect			36			8			(c	)		4			—			(7	)		—					—					41					8				(c	)
Derivative instruments (a)
Interest rate			38			(5	)		(d	)		2			(7	)		—			8					(17	)				19					—
Commodity			(1	)		1			(d	)		(1	)		—			—			2					—					1					—
Credit			(21	)		(13	)		(d	)		—			—			38			—					—					4					—
(a)	Amounts represent Level 3 derivative assets less Level 3 derivative liabilities.
(b)	Realized and unrealized gains and losses on trading account assets are reported in “other income” on the income statement.
(c)	Realized and unrealized gains and losses on principal investments and private equity and mezzanine investments are reported in “net gains (losses) from principal investing” on the income statement.
(d)	Realized and unrealized gains and losses on derivative instruments are reported in “corporate services income” and “other income” on the income statement.
(e)	Our policy is to recognize transfers into and transfers out of Level 3 as of the end of the reporting period.
(f)	Certain derivatives 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.
(g)	There were no issuances for the years ended December 31, 2013, and 2012.
(h)	These securities were transferred because of decreased observable market activity for these securities.
Assets 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. The following table presents our assets measured at fair value on a nonrecurring basis at December 31, 2013, and 2012:
		December 31, 2013												December 31, 2012
in millions		Level 1			Level 2			Level 3			Total			Level 1			Level 2			Level 3		Total
ASSETS MEASURED ON A NONRECURRING BASIS
Impaired loans			—			—		$	16		$	16			—			—		$	25	$	25
Loans held for sale (a)			—			—			—			—			—			—			9		9
Accrued income and other assets			—			—			14			14			—		$	2			20		22
Total assets on a nonrecurring basis at fair value			—			—		$	30		$	30			—		$	2		$	54	$	56
(a)	During 2013, we transferred $9 million of commercial and consumer loans and leases at their current fair value from held-for-sale status to the held-to-maturity portfolio, compared to $17 million during 2012.
Impaired loans.  We typically adjust the carrying amount of our impaired loans when there is evidence of probable loss and the expected fair value of the loan is less than its contractual amount. The amount of the impairment may be determined based on the estimated present value of future cash flows, the fair value of the underlying collateral, or the loan’s observable market price. Impaired loans with a specifically allocated allowance based on cash flow analysis or the value of the underlying collateral are classified as Level 3 assets. Impaired loans with a specifically allocated allowance based on an observable market price that reflects recent sale transactions for similar loans and collateral are classified as Level 2 assets.
The evaluations for impairment are prepared by the responsible relationship managers in our Asset Recovery Group and are reviewed and approved by the Asset Recovery Group Executive. The Asset Recovery Group is part of the Risk Management Group and reports to our Chief Risk Officer. These evaluations are performed in conjunction with the quarterly ALLL process.
Loans are evaluated for impairment on a quarterly basis. Loans included in the previous quarter’s review are re-evaluated and if their values have changed materially, the underlying information (loan balance and in most cases, collateral value) is compared. Material differences are evaluated for reasonableness, and the relationship managers and their senior managers consider these differences and determine if any adjustment is necessary. The inputs are developed and substantiated on a quarterly basis, based on current borrower developments, market conditions and collateral values.
The following two internal methods are used to value impaired loans:
¿		Cash flow analysis considers internally developed inputs, such as discount rates, default rates, costs of foreclosure and changes in collateral values.
¿		The fair value of the collateral, which may take the form of real estate or personal property, is based on internal estimates, field observations and assessments provided by third-party appraisers. We perform or reaffirm appraisals of collateral-dependent impaired loans at least annually. Appraisals may occur more frequently if the most recent appraisal does not accurately reflect the current market, the debtor is seriously delinquent or chronically past due, or there has been a material deterioration in the performance of the project or condition of the property. Adjustments to outdated appraisals that result in an appraisal value less than the carrying amount of a collateral-dependent impaired loan are reflected in the ALLL.
Impairment valuations are back-tested each quarter, based on a look-back of actual incurred losses on closed deals previously evaluated for impairment. The overall percent variance of actual net loan charge-offs on closed deals compared to the specific allocations on such deals is considered in determining each quarter’s specific allocations.
Loans held for sale.  Through a quarterly analysis of our loan portfolios held for sale, which include both performing and nonperforming loans, we determine any adjustments necessary to record the portfolios at the lower of cost or fair value in accordance with GAAP. Our analysis concluded that there were no loans held for sale portfolios adjusted to fair value at December 31, 2013. Loans held for sale portfolios adjusted to fair value totaled $9 million at December 31, 2012.
Market inputs, including updated collateral values, and reviews of each borrower’s financial condition influenced the inputs used in our internal models and other valuation methodologies, resulting in these adjustments. The valuations are prepared by the responsible relationship managers or analysts in our Asset Recovery Group and are reviewed and approved by the Asset Recovery Group Executive. Actual gains or losses realized on the sale of various loans held for sale provide a back-testing mechanism for determining whether our valuations of these loans held for sale that are adjusted to fair value are appropriate.
Valuations of performing commercial mortgage and construction loans held for sale are conducted using internal models that rely on market data from sales or nonbinding bids on similar assets, including credit spreads, treasury rates, interest rate curves and risk profiles, as well as our own assumptions about the exit market for the loans and details about individual loans within the respective portfolios. Therefore, we have classified these loans as Level 3 assets. The inputs related to our assumptions and other internal loan data include changes in real estate values, costs of foreclosure, prepayment rates, default rates and discount rates.
Valuations of nonperforming commercial mortgage and construction loans held for sale are based on current agreements to sell the loans or approved discounted payoffs. If a negotiated value is not available, we use third-party appraisals, adjusted for current market conditions. Since valuations are based on unobservable data, these loans have been classified as Level 3 assets.
Direct financing leases and operating lease assets held for sale.  Our KEF Accounting and Capital Markets groups are responsible for the valuation policies and procedures related to these assets. The Managing Director of the KEF Capital Markets group reports to the President of the KEF line of business. A weekly report is distributed to both groups that lists all equipment finance deals booked in the warehouse portfolio. On a quarterly basis, the KEF Accounting group prepares a detailed held-for-sale roll-forward schedule that is reconciled to the general ledger and the above mentioned weekly report. KEF management uses the held-for-sale roll-forward schedule to determine if an impairment adjustment is necessary in accordance with lower of cost or fair value guidelines.
Valuations of direct financing leases and operating lease assets held for sale are performed using an internal model that relies on market data, such as swap rates and bond ratings, as well as our own assumptions about the exit market for the leases and details about the individual leases in the portfolio. The inputs based on our assumptions include changes in the value of leased items and internal credit ratings. These leases have been classified as Level 3 assets. Leases for which we receive a current nonbinding bid, and the sale is considered probable, may be classified as Level 2. In a distressed market where market data is not available, an estimate of the fair value of the leased asset may be used to value the lease, resulting in a Level 3 classification. In an inactive market, the market value of the assets held for sale is determined as the present value of the future cash flows discounted at the current buy rate. KEF Accounting calculates an estimated fair value buy rate based on the credit premium inherent in the relevant bond index and the appropriate swap rate on the measurement date. The amount of the adjustment is calculated as book value minus the present value of future cash flows discounted at the calculated buy rate.
Goodwill and other intangible assets.  On a quarterly basis, we review impairment indicators to determine whether we need to evaluate the carrying amount of the goodwill and other intangible assets assigned to Key Community Bank and Key Corporate Bank. We also perform an annual impairment test for goodwill. Accounting guidance that permits an entity to first assess qualitative factors to determine whether additional goodwill impairment testing is required became effective for us on January 1, 2012. We did not choose to utilize a qualitative assessment in our annual goodwill impairment testing performed during the fourth quarter of 2013. Fair value of our reporting units is determined using both an income approach (discounted cash flow method) and a market approach (using publicly traded company and recent transactions data), which are weighted equally.
Inputs used include market-available data, such as industry, historical and expected growth rates, and peer valuations, as well as internally driven inputs, such as forecasted earnings and market participant insights. Since this valuation relies on a significant number of unobservable inputs, we have classified goodwill as Level 3. We use a third-party valuation services provider to perform the annual, and if necessary, any interim, Step 1 valuation process, and to perform a Step 2 analysis, if needed, on our reporting units. Annual and any interim valuations prepared by the third-party valuation services provider are reviewed by the appropriate individuals within Key to ensure that the assumptions used in preparing the analysis are appropriate and properly supported. For additional information on the results of recent goodwill impairment testing, see Note 10 (“Goodwill and Other Intangible Assets”).
The fair value of other intangible assets is calculated using a cash flow approach. While the calculation to test for recoverability uses a number of assumptions that are based on current market conditions, the calculation is based primarily on unobservable assumptions. Accordingly, these assets are classified as Level 3. Our lines of business, with oversight from our Accounting group, are responsible for routinely, at least quarterly, assessing whether impairment indicators are present. All indicators that signal impairment may exist are appropriately considered in this analysis. An impairment loss is only recognized for a held and used long lived asset if the sum of its estimated future undiscounted cash flows used to test for recoverability is less than its carrying value.
Our primary assumptions include attrition rates, alternative costs of funds and rates paid on deposits. For additional information on the results of other intangible assets impairment testing, see Note 10.
Other assets.  OREO and other repossessed properties are valued based on inputs such as appraisals and third-party price opinions, less estimated selling costs. Generally, we classify these assets as Level 3, but OREO and other repossessed properties for which we receive binding purchase agreements are classified as Level 2. Returned lease inventory is valued based on market data for similar assets and is classified as Level 2. Assets that are acquired through, or in lieu of, loan foreclosures are recorded initially as held for sale at fair value less estimated selling costs at the date of foreclosure. After foreclosure, valuations are updated periodically, and current market conditions may require the assets to be marked down further to a new cost basis.
¿		Commercial Real Estate Valuation Process: When a loan is reclassified from loan status to OREO because we took possession of the collateral, the Asset Recovery Group Loan Officer, in consultation with our OREO group, obtains a broker price opinion or a third-party appraisal, which is used to establish the fair value of the underlying collateral. The determined fair value of the underlying collateral less estimated selling costs becomes the carrying value of the OREO asset. In addition to valuations from independent third-party sources, our OREO group also writes down the carrying balance of OREO assets once a bona fide offer is contractually accepted, where the accepted price is lower than the current balance of the particular OREO asset. The fair value of OREO property is re-evaluated every 90 days and the OREO asset is adjusted as necessary.
¿		Consumer Real Estate Valuation Process: The Asset Management team within our Risk Operations group is responsible for valuation policies and procedures in this area. The current vendor partner provides monthly reporting of all broker price opinion evaluations, appraisals and the monthly market plans. Market plans are reviewed monthly, and valuations are reviewed and tested monthly to ensure proper pricing has been established and guidelines are being met. Risk Operations Compliance validates and provides periodic testing of the valuation process. The Asset Management team reviews changes in fair value measurements. Third-party broker price opinions are reviewed every 90 days, and the fair value is written down based on changes to the valuation. External factors are documented and monitored as appropriate.
Mortgage servicing assets are valued based on inputs such as prepayment speeds, earn rates, credit default rates, discount rates and servicing advances. We classify these assets as Level 3. Additional information regarding the valuation of mortgage servicing assets is provided in Note 9 (“Mortgage Servicing Assets”).
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 December 31, 2013, and December 31, 2012, along with the valuation techniques used, are shown in the following table:
December 31, 2013		Fair Value of			Valuation Technique		Significant	Range
dollars in millions		Level 3 Assets					Unobservable Input	(Weighted-Average)
Recurring
Other investments —  principal investments —   direct:		$	141		Individual analysis of the condition of each investment
Debt instruments							EBITDA multiple		6.00 - 7.00 (6.10)
Equity instruments of private companies							EBITDA multiple (where applicable)		4.80 - 10.40 (6.20)
							Revenue multiple (where applicable)		1.10 - 4.70 (4.00)
Nonrecurring
Impaired loans			16		Fair value of underlying collateral		Discount		10.00 - 100.00% (36.00%)
Goodwill			979		Discounted cash flow and market data		Earnings multiple of peers		10.10 - 14.40 (11.59)
							Equity multiple of peers		1.17 - 1.29 (1.24)
							Control premium		N/A (35.00%)
							Weighted-average cost of capital		N/A (13.00%)
December 31, 2012		Fair Value of			Valuation Technique		Significant	Range
dollars in millions		Level 3 Assets					Unobservable Input	(Weighted-Average)
Recurring
Other investments —  principal investments —   direct:		$	191		Individual analysis of the condition of each investment
Debt instruments							EBITDA multiple		5.50 - 6.00 (5.90)
Equity instruments of private companies							EBITDA multiple (where applicable)		5.00 - 8.50 (6.10)
							Revenue multiple (where applicable)		0.30 - 5.70 (4.80)
Nonrecurring
Impaired loans			25		Fair value of underlying collateral		Discount		0.00 - 100.00% (45.00%)
Goodwill			979		Discounted cash flow and market data		Earnings multiple of peers		9.70 - 14.20 (11.25)
							Equity multiple of peers		.95 - 1.17 (1.09)
							Control premium		N/A (30.00%)
							Weighted-average cost of capital		N/A (13.00%)
Fair Value Disclosures of Financial Instruments
The levels in the fair value hierarchy ascribed to our financial instruments and the related carrying amounts at December 31, 2013, and December 31, 2012, are shown in the following table.
		December 31, 2013
					Fair Value
in millions		Carrying			Level 1			Level 2			Level 3			Netting			Total
		Amount												Adjustment
ASSETS
Cash and short-term investments (a)		$	6,207		$	5,860		$	347			—			—		$	6,207
Trading account assets (b)			738			4			734			—			—			738
Securities available for sale (b)			12,346			20			12,326			—			—			12,346
Held-to-maturity securities (c)			4,756			—			4,617			—			—			4,617
Other investments (b)			969			—			392		$	577			—			969
Loans, net of allowance (d)			53,609			—			—			52,102			—			52,102
Loans held for sale (b)			611			—			—			611			—			611
Mortgage servicing assets (e)			332			—			—			386			—			386
Derivative assets (b)			407			56			1,134			29		$	(812	) (f)		407
LIABILITIES
Deposits with no stated maturity (a)		$	62,425			—		$	62,425			—			—		$	62,425
Time deposits (e)			6,837		$	558			6,368			—			—			6,926
Short-term borrowings (a)			1,877			2			1,875			—			—			1,877
Long-term debt (e)			7,650			7,611			397			—			—			8,008
Derivative liabilities (b)			414			49			864		$	1		$	(500	) (f)		414
		31-Dec-12
					Fair Value
in millions		Carrying			Level 1			Level 2			Level 3			Netting			Total
		Amount												Adjustment
ASSETS
Cash and short-term investments (a)		$	4,525		$	4,254		$	271			—			—		$	4,525
Trading account assets (b)			605			2			600		$	3			—			605
Securities available for sale (b)			12,094			43			12,051			—			—			12,094
Held-to-maturity securities (c)			3,931			—			3,992			—			—			3,992
Other investments (b)			1,064			—			396			668			—			1,064
Loans, net of allowance (d)			51,934			—			—			51,046			—			51,046
Loans held for sale (b)			599			—			—			599			—			599
Mortgage servicing assets (e)			204			—			—			238			—			238
Derivative assets (b)			693			54			1,883			26		$	(1,270	) (f)		693
LIABILITIES
Deposits with no stated maturity (a)		$	58,132			—		$	58,132			—			—		$	58,132
Time deposits (e)			7,861		$	408			7,612			—			—			8,020
Short-term borrowings (a)			1,896			—			1,896			—			—			1,896
Long-term debt (e)			6,847			2,807			4,585			—			—			7,392
Derivative liabilities (b)			584			54			1,331		$	2		$	(803	) (f)		584
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 Measured at Fair Value on a Nonrecurring Basis” in this note.
(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 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 mortgage servicing assets, 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 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.
We use valuation methods based on exit market prices in accordance with applicable accounting guidance. We determine fair value based on assumptions pertaining to the factors that a market participant would consider in valuing the asset. A substantial portion of our fair value adjustments are related to liquidity. During 2013, the fair values of our loan portfolios have generally remained stable, primarily due to increasing liquidity in the loan markets. If we were to use different assumptions, the fair values shown in the preceding table could change. Also, because the applicable accounting guidance for financial instruments excludes certain financial instruments and all nonfinancial instruments from its disclosure requirements, the fair value amounts shown in the table above do not, by themselves, represent the underlying value of our company as a whole.
Education lending business.  The discontinued education lending business consists of assets and liabilities (recorded at fair value) in the securitization trusts, as well as loans in portfolio (recorded at fair value), and loans in portfolio (recorded at carrying value with appropriate valuation reserves) that are outside the trusts. All of these loans were excluded from the table above as follows:
	¿		Loans at carrying value, net of allowance, of $2.4 billion ($2.0 billion at fair value) at December 31, 2013, and $2.6 billion ($2.3 billion at fair value) at December 31, 2012;
	¿		Portfolio loans at fair value of $147 million at December 31, 2013, and $157 million at December 31, 2012; and
	¿		Loans in the trusts at fair value of $2.0 billion at December 31, 2013, and $2.4 billion at December 31, 2012.
Securities issued by the education lending securitization trusts, which are the primary liabilities of the trusts, totaling $1.8 billion in fair value at December 31, 2013, and $2.2 billion in fair value at December 31, 2012, are also excluded from the above table.
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.
Residential real estate mortgage loans.  Residential real estate mortgage loans with carrying amounts of $2.2 billion at December 31, 2013, and $2.2 billion at December 31, 2012, are included in “Loans, net of allowance” in the above table.
Short-term financial instruments.  For financial instruments with a remaining average life to maturity of less than six months, carrying amounts were used as an approximation of fair values.

Securities

Securities	12 Months Ended
	Dec. 31, 2013
Investments Debt And Equity Securities [Abstract]	'
Securities	'
	7. Securities
	The amortized cost, unrealized gains and losses, and fair value of our securities available for sale and held-to-maturity securities are presented in the following table. 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. For more information about our securities available for sale and held-to-maturity securities and the related accounting policies, see Note 1 (“Summary of Significant Accounting Policies”).
			2013												2012
	December 31,		Amortized		Gross		Gross				Fair				Amortized			Gross		Gross		Fair
	in millions		Cost		Unrealized		Unrealized				Value				Cost			Unrealized		Unrealized		Value
					Gains		Losses											Gains		Losses
	SECURITIES AVAILABLE FOR SALE
	States and political subdivisions		$	39	$	1		—			$	40			$	47		$	2		—	$	49
	Collateralized mortgage obligations			11,120		152	$	272				11,000				11,148			316		—		11,464
	Other mortgage-backed securities			1,270		27		11				1,286				491			47		—		538
	Other securities			17		3		—				20				42			1		—		43
	Total securities available for sale		$	12,446	$	183	$	283			$	12,346			$	11,728		$	366		—	$	12,094
	HELD-TO-MATURITY SECURITIES
	Collateralized mortgage obligations		$	4,736	$	6	$	145			$	4,597			$	3,913		$	61		—	$	3,974
	Other securities			20		—		—				20				18			—		—		18
	Total held-to-maturity securities		$	4,756	$	6	$	145			$	4,617			$	3,931		$	61		—	$	3,992
	The following table summarizes our securities that were in an unrealized loss position as of December 31, 2013, and 2012.
			Duration of Unrealized Loss Position
			Less than 12 Months						12 Months or Longer									Total
	in millions		Fair Value		Gross		(a)		Fair Value				Gross				(a)	Fair Value		Gross		(a)
					Unrealized								Unrealized							Unrealized
					Losses								Losses							Losses
	December 31, 2013
	Securities available for sale:
	Collateralized mortgage obligations		$	5,122	$	261			$	157			$	11				$	5,279	$	272
	Other mortgage-backed securities			856		11				—				—					856		11
	Other securities			2		—				—				—					2		—
	Held-to-maturity:
	Collateralized mortgage obligations			3,969		145				—				—					3,969		145
	Other securities			2		—				—				—					2		—
	Total temporarily impaired securities		$	9,951	$	417			$	157			$	11				$	10,108	$	428
	December 31, 2012
	Securities available for sale:
	Other securities		$	31		—			$	3				—				$	34		—
	Total temporarily impaired securities		$	31		—			$	3				—				$	34		—
	(a)	Gross unrealized losses totaled less than $1 million for the year ended December 31, 2012.
	At December 31, 2013, we had $272 million of gross unrealized losses related to 60 fixed-rate collateralized mortgage obligations that we invested in as part of our overall A/LM strategy. These securities have a weighted-average maturity of 5.1 years at December 31, 2013. Since these securities have a fixed interest rate, their fair value is sensitive to movements in market interest rates. We also had $11 million of gross unrealized losses related to 32 other mortgage-backed securities positions, which have a weighted-average maturity of 3.8 years at December 31, 2013. These unrealized losses are considered temporary since we expect to collect all contractually due amounts from these securities. Accordingly, these investments have been reduced to their fair value through OCI, not earnings.
	We regularly assess our securities portfolio for OTTI. The assessments are based on the nature of the securities, the underlying collateral, the financial condition of the issuer, the extent and duration of the loss, our intent related to the individual securities, and the likelihood that we will have to sell securities prior to expected recovery.
	The debt securities identified to have OTTI are written down to their current fair value. For those debt securities that we intend to sell, or more-likely-than-not will be required to sell, prior to the expected recovery of the amortized cost, the entire impairment (i.e., the difference between amortized cost and the fair value) is recognized in earnings. For those debt securities that we do not intend to sell, or more-likely-than-not will not be required to sell, prior to expected recovery, the credit portion of OTTI is recognized in earnings, while the remaining OTTI is recognized in equity as a component of AOCI on the balance sheet. As shown in the following table, we did not have any impairment losses recognized in earnings for the year ended December 31, 2013.
	Year ended December 31, 2013
	in millions
	Balance at December 31, 2012		$	4
	Impairment recognized in earnings			—
	Balance at December 31, 2013		$	4
	Realized gains and losses related to securities available for sale were as follows:
	Year ended December 31, 2013			2013		2012		2011
	in millions
	Realized gains		$	1		—	$	23
	Realized losses (a)			—		—		22
	Net securities gains (losses)		$	1		—	$	1
	(a)	Realized losses totaled less than $1 million for the year ended December 31, 2013.
	At December 31, 2013, securities available for sale and held-to-maturity securities totaling $11.1 billion were 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 securities by remaining maturity. CMOs and other mortgage-backed securities (both of which are included in the securities available-for-sale portfolio) as well the CMOs in the 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.
			Securities				Held-to-Maturity
			Available for Sale				Securities
	December 31, 2013		Amortized		Fair		Amortized				Fair
	in millions		Cost		Value		Cost				Value
	Due in one year or less		$	457	$	466	$	7			$	6
	Due after one through five years			11,550		11,462		4,605				4,475
	Due after five through ten years			435		414		144				136
	Due after ten years			4		4		—				—
	Total		$	12,446	$	12,346	$	4,756			$	4,617

Derivatives_and_Hedging_Activi

Derivatives and Hedging Activities	12 Months Ended
	Dec. 31, 2013
Derivative Instruments And Hedging Activities Disclosure [Abstract]	'
Derivatives and Hedging Activities	'
	8. Derivatives and Hedging Activities
	We are a party to various derivative instruments, mainly through our subsidiary, KeyBank. Derivative instruments are contracts between two or more parties that have a notional amount and an underlying variable, require a small or no net investment, and allow for the net settlement of positions. A derivative’s notional amount serves as the basis for the payment provision of the contract, and takes the form of units, such as shares or dollars. A derivative’s underlying variable is a specified interest rate, security price, commodity price, foreign exchange rate, index, or other variable. The interaction between the notional amount and the underlying variable determines the number of units to be exchanged between the parties and influences the fair value of the derivative contract.
	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 the loan portfolio, hedge against changes in foreign currency exchange rates, and meet client financing and hedging needs. As further discussed in this note:
		¿		interest rate risk represents the possibility that the EVE or net interest income will be adversely affected by fluctuations in interest rates;
		¿		credit risk is the risk of loss arising from an obligor’s inability or failure to meet contractual payment or performance terms; and
		¿		foreign exchange risk is the risk that an exchange rate will adversely affect the fair value of a financial instrument.
	Derivative assets and liabilities are recorded at fair value on the balance sheet, after taking into account the effects of bilateral collateral and master netting agreements. These agreements allow us to settle all derivative contracts held with a single counterparty on a net basis, and to offset net derivative positions with related cash collateral, where applicable. As a result, we could have derivative contracts with negative fair values included in derivative assets on the balance sheet and contracts with positive fair values included in derivative liabilities.
	At December 31, 2013, after taking into account the effects of bilateral collateral and master netting agreements, we had $91 million of derivative assets and a positive $7 million of derivative liabilities that relate to contracts entered into for hedging purposes. Our hedging derivative liabilities are in an asset position largely because we have contracts with positive fair values as a result of master netting agreements. 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 $316 million and derivative liabilities of $421 million that were not designated as hedging instruments.
	The Dodd-Frank Act, which is currently being implemented, may limit the types of derivative activities that KeyBank and other insured depository institutions may conduct. As a result, we may not continue to use all of the types of derivatives noted above in the future. For further information, please see the section entitled “Supervision and Regulation” in Item 1 of this report.
	Additional information regarding our accounting policies for derivatives is provided in Note 1 (“Summary of Significant Accounting Policies”) under the heading “Derivatives.”
	Derivatives Designated in Hedge Relationships
	Net interest income and the EVE change in response to changes in the mix of assets, liabilities, and off-balance sheet instruments; associated interest rates tied to each instrument; differences in the repricing and maturity characteristics of interest-earning assets and interest-bearing liabilities; and changes in interest rates. We utilize derivatives that have been designated as part of a hedge relationship in accordance with the applicable accounting guidance to minimize the exposure and volatility of net interest income and EVE to interest rate fluctuations. The primary derivative instruments used to manage interest rate risk are interest rate swaps, which convert the contractual interest rate index of agreed-upon amounts of assets and liabilities (i.e., notional amounts) to another interest rate index.
	We designate certain “receive fixed/pay variable” interest rate swaps as fair value hedges. These contracts convert certain fixed-rate long-term debt into variable-rate obligations, thereby modifying our exposure to changes in interest rates. As a result, we receive fixed-rate interest payments in exchange for making variable-rate payments over the lives of the contracts without exchanging the notional amounts.
	Similarly, we designate certain “receive fixed/pay variable” interest rate swaps as cash flow hedges. These contracts effectively convert certain floating-rate loans into fixed-rate loans to reduce the potential adverse effect of interest rate decreases on future interest income. Again, we receive fixed-rate interest payments in exchange for making variable-rate payments over the lives of the contracts without exchanging the notional amounts.
	We also designate certain “pay fixed/receive variable” interest rate swaps as cash flow hedges. These swaps convert certain floating-rate debt into fixed-rate debt. We also use these swaps to manage the interest rate risk associated with anticipated sales of certain commercial real estate loans. The swaps protect against the possible short-term decline in the value of the loans that could result from changes in interest rates between the time they are originated and the time they are sold.
	Interest rate swaps are also used to hedge the floating-rate debt that funds fixed-rate leases entered into by our equipment finance line of business. These swaps are designated as cash flow hedges to mitigate the interest rate mismatch between the fixed-rate lease cash flows and the floating-rate payments on the debt.
	We use foreign currency forward transactions to hedge the foreign currency exposure of our net investment in various foreign equipment finance entities. These entities are denominated in a non-U.S. currency. These swaps are designated as net investment hedges to mitigate the exposure of measuring the net investment at the spot foreign exchange rate.
	During the first quarter of 2012 and in prior years, Key had outstanding issuances of medium-term notes that were denominated in foreign currencies. The notes were subject to translation risk, which represented the possibility that the fair value of the foreign-denominated debt would change based on movement of the underlying foreign currency spot rate. The derivatives used for managing foreign currency exchange risk were cross currency swaps. The hedge converted the notes to a variable-rate U.S. currency-denominated debt, which was designated as a fair value hedge of foreign currency exchange risk.
	Derivatives Not Designated in Hedge Relationships
	On occasion, we enter into interest rate swap contracts to manage economic risks but do not designate the instruments in hedge relationships. Excluding contracts addressing customer exposures, the amount of derivatives hedging risks on an economic basis at December 31, 2013, was not significant.
	Like other financial services institutions, we originate loans and extend credit, both of which expose us to credit risk. We actively manage our overall loan portfolio and the associated credit risk in a manner consistent with asset quality objectives and concentration risk tolerances to mitigate portfolio credit risk. Purchasing credit default swaps enables us to transfer to a third party a portion of the credit risk associated with a particular extension of credit. We may also sell credit derivatives to offset our purchased credit default swap position prior to maturity. Although we use credit default swaps for risk management purposes, they are not treated as hedging instruments.
	We also enter into derivative contracts for other purposes, including:
		¿		interest rate swap, cap, and floor contracts entered into generally to accommodate the needs of commercial loan clients;
		¿		energy and base metal swap and options contracts entered into to accommodate the needs of clients;
		¿		futures contracts and positions with third parties that are intended to offset or mitigate the interest rate or market risk related to client positions discussed above; and
		¿		foreign exchange forward contracts and options entered into primarily to accommodate the needs of clients.
	These contracts are not designated as part of hedge relationships.
	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 December 31, 2013, and December 31, 2012. The change in the notional amounts of these derivatives by type from December 31, 2012, to December 31, 2013, indicates the volume of our derivative transaction activity during 2013. The notional amounts are not affected by bilateral collateral and master netting agreements. The balances are presented on a gross basis, prior to the application of bilateral collateral and master netting agreements. 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. Where master netting agreements are not in effect or are not enforceable under bankruptcy laws, we do not adjust those derivative assets and liabilities with counterparties. Securities collateral related to legally enforceable master netting agreements is not offset on the balance sheet. Our derivative instruments are included in “derivative assets” or “derivative liabilities” on the balance sheet, as indicated in the following table:
			December 31, 2013											December 31, 2012
							Fair Value											Fair Value
	in millions		Notional				Derivative			Derivative				Notional				Derivative				Derivative
			Amount				Assets			Liabilities				Amount				Assets				Liabilities
	Derivatives designated as hedging instruments:
	Interest rate		$	14,487			$	306		$	37			$	19,085			$	579			$	30
	Foreign exchange			190				4			1				196				—				7
	Total			14,677				310			38				19,281				579				37
	Derivatives not designated as hedging instruments:
	Interest rate			46,173				733			702				51,633				1,144				1,122
	Foreign exchange			4,701				59			56				5,025				75				68
	Commodity			1,616				112			106				1,688				156				150
	Credit			910				5			12				955				9				10
	Equity			—				—			—				7				—				—
	Total			53,400				909			876				59,308				1,384				1,350
	Netting adjustments (a)			—				(812	)		(500	)			—				(1,270	)			(803	)
	Net derivatives in the balance sheet			68,077				407			414				78,589				693				584
	Other collateral (b)			—				(72	)		(287	)			—				(163	)			(475	)
	Net derivative amounts		$	68,077			$	335		$	127			$	78,589			$	530			$	109
	(a)	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.
	(b)	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.  Instruments designated as fair value hedges are recorded at fair value and included in “derivative assets” or “derivative liabilities” on the balance sheet. The effective portion of a change in the fair value of an instrument designated as a fair value hedge is recorded in earnings at the same time as a change in fair value of the hedged item, resulting in no effect on net income. The ineffective portion of a change in the fair value of such a hedging instrument is recorded in “other income” on the income statement with no corresponding offset. During the year ended December 31, 2013, we did not exclude any portion of these hedging instruments from the assessment of hedge effectiveness. While there is some immaterial ineffectiveness in our hedging relationships, all of our fair value hedges remained “highly effective” as of December 31, 2013.
	The following table summarizes the pre-tax net gains (losses) on our fair value hedges for the years ended December 31, 2013, and 2012, and where they are recorded on the income statement.
			Year ended December 31, 2013
	in millions		Income Statement Location of		Net Gains				Hedged Item	Income Statement Location of		Net Gains
			Net Gains (Losses) on Derivative		(Losses) on					Net Gains (Losses) on Hedged Item		(Losses) on
					Derivative							Hedged Item
	Interest rate		Other income		$	(222)			Long-term debt	Other income		$	222				(a	)
	Interest rate		Interest expense – Long-term debt			129
	Total				$	-93						$	222
			Year ended December 31, 2012
	in millions		Income Statement Location of		Net Gains				Hedged Item	Income Statement Location of		Net Gains
			Net Gains (Losses) on Derivative		(Losses) on					Net Gains (Losses) on Hedged Item		(Losses) on
					Derivative							Hedged Item
Interest rate		Other income		$	(52	)		Long-term debt	Other income		$	45				(a	)
Interest rate		Interest expense – Long-term debt			155
Foreign exchange		Other income			5			Long-term debt	Other income			(6)				(a	)
Foreign exchange		Interest expense – Long-term debt			1			Long-term debt	Interest expense – Long-term debt			(1)				(b	)
Total				$	109						$	38
(a)	Net gains (losses) on hedged items represent the change in fair value caused by fluctuations in interest rates.
(b)	Net gains (losses) on hedged items represent the change in fair value caused by fluctuations in foreign currency exchange rates.
Cash flow hedges.  Instruments designated as cash flow hedges are recorded at fair value and included in “derivative assets” or “derivative liabilities” on the balance sheet. Initially, the effective portion of a gain or loss on a cash flow hedge is recorded as a component of AOCI on the balance sheet. This amount is subsequently reclassified into income when the hedged transaction affects earnings (e.g., when we pay variable-rate interest on debt, receive variable-rate interest on commercial loans, or sell commercial real estate loans). The ineffective portion of cash flow hedging transactions is included in “other income” on the income statement. During the year ended December 31, 2013, we did not exclude any portion of these hedging instruments from the assessment of hedge effectiveness. While there is some immaterial ineffectiveness in our hedging relationships, all of our cash flow hedges remained “highly effective” as of December 31, 2013.
Considering the interest rates, yield curves, and notional amounts as of December 31, 2013, we would expect to reclassify an estimated $22 million of net losses on derivative instruments from AOCI to income during the next twelve months for our cash flow hedges. In addition, we expect to reclassify approximately $5 million of net gains related to terminated cash flow hedges from AOCI to income during the next twelve months. As of December 31, 2013, the maximum length of time over which we hedge forecasted transactions is 15 years.
Net investment hedges.  In May 2012, we began entering into foreign currency forward contracts to hedge our exposure to changes in the carrying value of our investments as a result of changes in the related foreign exchange rates. Instruments designated as net investment hedges are recorded at fair value and included in “derivative assets” or “derivative liabilities” on the balance sheet. Initially, the effective portion of a gain or loss on a net investment hedge is recorded as a component of AOCI on the balance sheet when the terms of the derivative match the notional and currency risk being hedged. The effective portion is subsequently reclassified into income when the hedged transaction affects earnings (e.g., when we dispose of a foreign subsidiary). At December 31, 2013, AOCI reflected unrecognized after-tax gains totaling less than $1 million related to cumulative changes in the fair value of our net investment hedge, which offset the unrecognized after-tax gains on net investment balances. The ineffective portion of net investment hedging transactions is included in “other income” on the income statement, but there was no net investment hedge ineffectiveness as of December 31, 2013. We did not exclude any portion of our hedging instruments from the assessment of hedge effectiveness while these hedges were outstanding during the year ended December 31, 2013.
The following table summarizes the pre-tax net gains (losses) on our cash flow and net investment hedges for the years ended December 31, 2013, and 2012, and where they are recorded on the income statement. The table includes the effective portion of net gains (losses) recognized in OCI during the period, the effective portion of net gains (losses) reclassified from OCI into income during the current period, and the portion of net gains (losses) recognized directly in income, representing the amount of hedge ineffectiveness.
		Year ended December 31, 2013
in millions		Net Gains (Losses)				Income Statement Location of Net Gains			Net Gains				Income Statement Location of				Net Gains
		Recognized in OCI				(Losses) Reclassified From OCI Into			(Losses) Reclassified				Net Gains (Losses) Recognized				(Losses) Recognized
		(Effective Portion)				Income (Effective Portion)			From OCI Into Income				in  Income (Ineffective Portion)				in Income (Ineffective
									(Effective Portion)								Portion)
Cash Flow Hedges
Interest rate		$	(19	)			Interest income – Loans		$	67				Other income				—
Interest rate			20				Interest expense –  Long-term debt			(8	)			Other income				—
Interest rate			—				Investment banking and debt placement fees			—				Other income				—
Net Investment Hedges
Foreign exchange contracts			9				Other Income			(3	)			Other income				—
Total		$	10						$	56								—
		Year ended December 31, 2012
in millions		Net Gains (Losses)				Income Statement Location of			Net Gains				Income Statement Location of				Net Gains
		Recognized in OCI				Net Gains (Losses)			(Losses) Reclassified				Net Gains (Losses) Recognized				(Losses) Recognized
		(Effective Portion)				Reclassified From OCI Into Income			From OCI Into Income				in  Income (Ineffective Portion)				in Income (Ineffective
						(Effective Portion)			(Effective Portion)								Portion)
Cash Flow Hedges
Interest rate		$	105				Interest income – Loans		$	66				Other income				—
Interest rate			(6	)			Interest expense – Long-term debt			(10	)			Other income				—
Interest rate			—				Investment banking and debt placement fees			—				Other income				—
Net Investment Hedges
Foreign exchange contracts			(14	)			Other Income			—				Other income				—
Total		$	85						$	56								—
The after-tax change in AOCI resulting from cash flow and net investment hedges is as follows:
in millions		December 31,				2013 Hedging			Reclassification				December 31,
		2012				Activity			of Gains to Net				2013
									Income
AOCI resulting from cash flow and net investment hedges		$	18			$	6		$		(35)		$	(11	)
Nonhedging instruments.  Our derivatives that are not designated as hedging instruments are recorded at fair value in “derivative assets” and “derivative liabilities” on the balance sheet. Adjustments to the fair values of these instruments, as well as any premium paid or received, are included in “corporate services income” and “other income” on the income statement.
The following table summarizes the pre-tax net gains (losses) on our derivatives that are not designated as hedging instruments for the years ended December 31, 2013, 2012, and 2011, and where they are recorded on the income statement.
		2013											2012												2011
in millions		Corporate				Other			Total				Corporate				Other				Total				Corporate			Other			Total
		Services				Income							Services				Income								Services			Income
		Income											Income												Income
NET GAINS (LOSSES)
Interest rate		$	17				—		$	17			$	24			$	(2	)		$	22			$	19			—		$	19
Foreign exchange			38				—			38				36				—				36				42			—			42
Commodity			5				—			5				9				—				9				4			—			4
Credit			1			$	(15	)		(14	)			—				(20	)			(20	)			(3	)	$	(42	)		(45	)
Total net gains (losses)		$	61			$	(15	)	$	46			$	69			$	(22	)		$	47			$	62		$	(42	)	$	20
Counterparty Credit Risk
Like other financial instruments, derivatives contain an element of credit risk. This risk is measured as the expected positive replacement value of the contracts. We use several means to mitigate and manage exposure to credit risk on derivative contracts. We generally enter into bilateral collateral and master netting agreements that provide for the net settlement of all contracts with a single counterparty in the event of default. Additionally, we monitor counterparty credit risk exposure on each contract to determine appropriate limits on our total credit exposure across all product types. We review our collateral positions on a daily basis and exchange collateral with our counterparties in accordance with ISDA and other related agreements. We generally hold collateral in the form of cash and highly-rated securities issued by the U.S. Treasury, government-sponsored enterprises or GNMA. The cash collateral netted against derivative assets on the balance sheet totaled $308 million at December 31, 2013, and $494 million at December 31, 2012. The cash collateral netted against derivative liabilities totaled $4 million at December 31, 2013, and $27 million at December 31, 2012. The relevant agreements with clearing organization counterparties are not considered to be qualified master netting agreements. Therefore, we cannot net derivative contracts or offset those contracts with related cash collateral with these counterparties. At December 31, 2013, we posted $25 million of cash collateral with clearing organizations. This additional cash collateral is included in “accrued income and other assets” and “accrued expense and other liabilities” on the balance sheet.
The following table summarizes our largest exposure to an individual counterparty at the dates indicated.
December 31,		2013				2012
in millions
Largest gross exposure (derivative asset) to an individual counterparty		$	121			$	182
Collateral posted by this counterparty			42				66
Derivative liability with this counterparty			106				191
Collateral pledged to this counterparty			33				82
Net exposure after netting adjustments and collateral			6				7
The following table summarizes the fair value of our derivative assets by type. 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.
December 31,		2013				2012
in millions
Interest rate		$	633			$	1,114
Foreign exchange			23				23
Commodity			58				47
Credit			1				3
Derivative assets before collateral			715				1,187
Less: Related collateral			308				494
Total derivative assets		$	407			$	693
We enter into derivative transactions with two primary groups: broker-dealers and banks, and clients. Since 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 generally are high dollar volume. We generally enter into bilateral collateral and master netting agreements with these counterparties. At December 31, 2013, for derivatives that have associated bilateral collateral and master netting agreements, we had gross exposure of $534 million to broker-dealers and banks. We had net exposure of $99 million after the application of master netting agreements and cash collateral, and we were in an over-collateralized net position of $1 million after considering $100 million of additional collateral held in the form of securities.
We enter into transactions with clients to accommodate their business needs. These types of transactions generally are low dollar volume. We generally enter into master netting agreements with these counterparties. In addition, we mitigate our overall portfolio exposure and market risk by buying and selling U.S. Treasuries and Eurodollar futures, and entering into offsetting positions and other derivative contracts. Due to the smaller size and magnitude of the individual contracts with clients, we generally do not exchange collateral in connection with these derivative transactions. To address the risk of default associated with the uncollateralized contracts, we have established a default reserve (included in “derivative assets”) in the amount of $14 million at December 31, 2013, which we estimate to be the potential future losses on amounts due from client counterparties in the event of default. At December 31, 2012, the default reserve was $19 million. At December 31, 2013, we had gross exposure of $358 million to client counterparties for derivatives that have associated master netting agreements. We had net exposure of $308 million on our derivatives with clients after the application of master netting agreements, collateral and the related reserve.
Credit Derivatives
We are both a buyer and 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. We may also sell credit derivatives, mainly single-name credit default swaps, to offset our purchased credit default swap position prior to maturity.
The following table summarizes the fair value of our credit derivatives purchased and sold by type as of December 31, 2013, and 2012. The fair value of credit derivatives presented below does not take into account the effects of bilateral collateral or master netting agreements.
December 31,		2013											2012
in millions		Purchased				Sold			Net				Purchased				Sold				Net
Single-name credit default swaps		$	(7)			$	1		$	(6)			$	(1)			$	1				—
Traded credit default swap indices			—				—			—				—				—				—
Other			—				-1			-1				—				-1			$	-1
Total credit derivatives		$	-7				—		$	-7			$	-1				—			$	-1
Single-name credit default swaps are bilateral contracts whereby the seller agrees, for a premium, to provide protection against the credit risk of a specific entity (the “reference entity”) in connection with a specific debt obligation. The protected credit risk is related to adverse credit events, such as bankruptcy, failure to make payments, and acceleration or restructuring of obligations, identified in the credit derivative contract. As the seller of a single-name credit derivative, we may settle in one of two ways if the underlying reference entity experiences a predefined credit event. We may be required to pay the purchaser the difference between the par value and the market price of the debt obligation (cash settlement) or receive the specified referenced asset in exchange for payment of the par value (physical settlement). If we effect a physical settlement and receive our portion of the related debt obligation, we will join other creditors in the liquidation process, which may enable us to recover a portion of the amount paid under the credit default swap contract. We also may purchase offsetting credit derivatives for the same reference entity from third parties that will permit us to recover the amount we pay should a credit event occur.
A traded credit default swap index represents a position on a basket or portfolio of reference entities. As a seller of protection on a credit default swap index, we would be required to pay the purchaser if one or more of the entities in the index had a credit event. Upon a credit event, the amount payable is based on the percentage of the notional amount allocated to the specific defaulting entity. During 2012, we suspended trading in traded credit default swap indices that had the purpose of diversifying concentration risk within our loan portfolio.
The majority of transactions represented by the “other” category shown in the above table are risk participation agreements. In these transactions, the lead participant has a swap agreement with a customer. The lead participant (purchaser of protection) then enters into a risk participation agreement with a counterparty (seller of protection), under which the counterparty receives a fee to accept a portion of the lead participant’s credit risk. If the customer defaults on the swap contract, the counterparty to the risk participation agreement must reimburse the lead participant for the counterparty’s percentage of the positive fair value of the customer swap as of the default date. If the customer swap has a negative fair value, the counterparty has no reimbursement requirements. If the customer defaults on the swap contract and the seller fulfills its payment obligations under the risk participation agreement, the seller is entitled to a pro rata share of the lead participant’s claims against the customer under the terms of the swap agreement.
The following table provides information on the types of credit derivatives sold by us and held on the balance sheet at December 31, 2013, and 2012. The notional amount represents the maximum amount that the seller could be required to pay. The payment/performance risk assessment is based on the default probabilities for the underlying reference entities’ debt obligations using a Moody’s credit ratings matrix known as Moody’s “Idealized” Cumulative Default Rates. 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 directly correlated to the probability that we will have to make a payment under the credit derivative contracts.
		2013													2012
December 31,		Notional				Average			Payment /						Notional				Average				Payment /
dollars in millions		Amount				Term			Performance						Amount				Term				Performance
						(Years)			Risk										(Years)				Risk
Single-name credit default swaps		$	55				0.77			22.28			%		$	146				0.92				11.62			%
Traded credit default swap indices			—				—			—						—				—				—
Other			13				5.03			8.82						23				5.35				10.77
Total credit derivatives sold		$	68				—			—					$	169				—				—
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 level, usually investment-grade level (i.e., “Baa3” for Moody’s and “BBB-” for S&P). At December 31, 2013, KeyBank’s ratings were “A3” with Moody’s and “A-” with S&P, and KeyCorp’s ratings were “Baa1” with Moody’s and “BBB+” with S&P. As of December 31, 2013, 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 $298 million, which includes $315 million in derivative assets and $613 million in derivative liabilities. We had $304 million in cash and securities collateral posted to cover those positions as of December 31, 2013. The aggregate fair value of all derivative contracts with credit risk contingent features held by KeyCorp as of December 31, 2013, that were in a net liability position totaled $1 million, which consists solely of derivative liabilities. We had no collateral posted to cover those positions as of December 31, 2013.
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 December 31, 2013, and 2012. The additional collateral amounts were calculated based on scenarios under which KeyBank’s ratings are downgraded one, two or three ratings as of December 31, 2013, and take into account all collateral already posted. A similar calculation was performed for KeyCorp, and less than $1 million of additional collateral would have been required as of December 31, 2013, and $3 million as of December 31, 2012.
December 31,		2013							2012
in millions		Moody’s				S&P			Moody’s				S&P
KeyBank’s long-term senior			A3				A-			A3				A-
unsecured credit ratings
One rating downgrade		$	6			$	6		$	6			$	6
Two rating downgrades			11				11			11				11
Three rating downgrades			11				11			11				11
KeyBank’s long-term senior unsecured credit rating is currently four ratings above noninvestment grade at Moody’s and S&P. If KeyBank’s ratings had been downgraded below investment grade as of December 31, 2013, payments of up to $13 million 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. If KeyCorp’s ratings had been downgraded below investment grade as of December 31, 2013, payments of $1 million 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	12 Months Ended
	Dec. 31, 2013
Text Block [Abstract]	'
Mortgage Servicing Assets	'
	9. Mortgage Servicing Assets
	We originate and periodically sell commercial mortgage loans but continue to service those loans for the buyers. We also may purchase the right to service commercial mortgage loans for other lenders. A servicing asset is recorded if we purchase or retain the right to service loans in exchange for servicing fees that exceed the going market rate. Changes in the carrying amount of mortgage servicing assets are summarized as follows:
	Year ended December 31,		2013			2012
	in millions
	Balance at beginning of period		$	204		$	173
	Servicing retained from loan sales			48			47
	Purchases			150	(a)		44
	Amortization			(70	)		(60	)
	Balance at end of period		$	332		$	204
	Fair value at end of period		$	386		$	238
	(a)	Amount includes $120 million in mortgage servicing assets that were acquired from Bank of America’s Global Mortgages & Securitized Products business during 2013. See Note 13 (“Acquisitions and Discontinued Operations”) for further details regarding this acquisition.
	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 December 31, 2013, and 2012, along with the valuation techniques, are shown in the following table:
	December 31, 2013		Valuation Technique		Significant	Range
	dollars in millions				Unobservable Input	(Weighted-Average)
	Mortgage servicing assets		Discounted cash flow		Prepayment speed	0.9 - 72.8%(11.0%)
					Expected defaults	1.1 - 3.0%(2.1%)
					Residual cash flows discount rate	7.0 - 15.0%(7.9%)
					Escrow earn rate	0.3 - 3.3%(1.5%)
					Servicing cost	$150 - $9,296($962)
					Loan assumption rate	0.0 - 3.0%(1.43%)
					Percentage late	0.0 - 2.0%(0.35%)
	December 31, 2012		Valuation Technique		Significant	Range
	dollars in millions				Unobservable Input	(Weighted-Average)
	Mortgage servicing assets		Discounted cash flow		Prepayment speed	0.9 - 75.8%(8.60%)
					Expected defaults	1.00 - 3.00%(2.40%)
					Residual cash flows discount rate	7.00 - 15.00%(9.00%)
					Escrow earn rate	0.24 - 2.56%(1.50%)
					Servicing cost	$916 - $16,604($2,483)
					Loan assumption rate	0.00 - 3.00%(2.32%)
					Percentage late	0.00 - 2.00%(0.22%)
	If these economic assumptions change or prove incorrect, the fair value of mortgage servicing assets may also change. The volume of loans serviced, expected credit losses, and the value assigned to escrow deposits are critical to the valuation of servicing assets. At December 31, 2013, a 1.00% decrease in the value assigned to the escrow deposits would cause a $54 million decrease in the fair value of our mortgage servicing assets. An increase in the assumed default rate of commercial mortgage loans of 1.00% would cause a $4 million decrease in the fair value of our mortgage servicing assets.
	Contractual fee income from servicing commercial mortgage loans totaled $58 million for the year ended December 31, 2013, and $25 million for the year ended December 31, 2012. We have elected to account for servicing assets using the amortization method. The amortization of servicing assets is determined in proportion to, and over the period of, the estimated net servicing income. The amortization of servicing assets for each period, as shown in the table at the beginning of this note, is recorded as a reduction to fee income. Both the contractual fee income and the amortization are recorded in “mortgage servicing fees” on the income statement.
	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,” and Note 13 (“Acquisitions and Discontinued Operations”) under the heading “Education lending” in this report.

Goodwill_and_Other_Intangible_

Goodwill and Other Intangible Assets	12 Months Ended
	Dec. 31, 2013
Goodwill And Intangible Assets Disclosure [Abstract]	'
Goodwill and Other Intangible Assets	'
	10. Goodwill and Other Intangible Assets
	Goodwill represents the amount by which the cost of net assets acquired in a business combination exceeds their fair value. Other intangible assets are primarily the net present value of future economic benefits to be derived from the purchase of credit card receivable assets and core deposits. 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.”
	Our annual goodwill impairment testing is performed as of October 1 each year. On that date in 2013, we determined that the estimated fair value of the Key Community Bank unit was 23% greater than its carrying amount; in 2012, the excess was 10%. If actual results, market conditions, and economic conditions were to differ from the assumptions and data used in this goodwill impairment testing, the estimated fair value of the Key Community Bank unit could change. The carrying amount of the Key Community Bank and Key Corporate Bank units represents the average equity based on risk-weighted regulatory capital for goodwill impairment testing and management reporting purposes. There has been no goodwill associated with our Key Corporate Bank unit since the first quarter of 2009, when we recorded a $223 million pre-tax impairment charge and wrote off all of the remaining goodwill that had been assigned to that unit.
	Based on our quarterly review of impairment indicators during 2013 and 2012, it was not necessary to perform further reviews of goodwill recorded in our Key Community Bank unit. We will continue to monitor the Key Community Bank unit as appropriate since it is particularly dependent upon economic conditions that impact consumer credit risk and behavior.
	Changes in the carrying amount of goodwill by reporting unit are presented in the following table.
	in millions		Key		Key		Total
			Community		Corporate
			Bank		Bank
	BALANCE AT DECEMBER 31, 2011		$	917		—	$	917
	Impairment losses based on results of interim impairment testing			—		—		—
	Acquisition of Western New York branches			62		—		62
	BALANCE AT DECEMBER 31, 2012			979		—		979
	Impairment losses based on results of interim impairment testing			—		—		—
	BALANCE AT DECEMBER 31, 2013		$	979		—	$	979
	The acquisition of 37 retail banking branches in Western New York during 2012 resulted in a $62 million increase in the goodwill at the Key Community Bank unit. Additional information regarding the acquisition is provided in Note 13 (“Acquisitions and Discontinued Operations”).
	As of December 31, 2013, we expected goodwill in the amount of $129 million to be deductible for tax purposes in future periods.
	Accumulated impairment losses related to the Key Corporate Bank reporting unit totaled $665 million at December 31, 2013, 2012, and 2011. There were no accumulated impairment losses related to the Key Community Bank unit at December 31, 2013, 2012, and 2011.
	The following table shows the gross carrying amount and the accumulated amortization of intangible assets subject to amortization.
			2013				2012
	December 31,		Gross Carrying		Accumulated		Gross Carrying		Accumulated
	in millions		Amount		Amortization		Amount		Amortization
	Intangible assets subject to amortization:
	Core deposit intangibles		$	105	$	70	$	105	$	56
	PCCR intangibles (a)			136		44		136		14
	Other intangible assets (b)			135		135		135		135
	Total		$	376	$	249	$	376	$	205
	(a)	PCCR intangible assets related to the 2012 acquisition of credit card receivables from Elan Financial Services, Inc. ($135 million of PCCR at acquisition date) and Western New York Branches ($1 million of PCCR at acquisition date).
	(b)	Carrying amount and accumulated amortization excludes $18 million and $25 million at December 31, 2013, and December 31, 2012, respectively, related to the discontinued operations of Austin and the sale of Victory.
	As a result of the Western New York branches acquisition on July 13, 2012, a core deposit intangible asset was recognized at its acquisition date fair value of $40 million. This core deposit intangible asset is being amortized on an accelerated basis over its useful life of 7 years. A second closing of this acquisition on September 14, 2012, relating exclusively to the purchase of credit card receivables, resulted in a PCCR intangible asset of $1 million that is being amortized on an accelerated basis over its useful life of 8 years.
	As a result of the purchase of Key-branded credit card assets from Elan Financial Services, Inc. on August 1, 2012, a PCCR intangible asset was recognized at its acquisition date fair value of $135 million. This PCCR asset is being amortized on an accelerated basis over its useful life of 8 years.
	Additional information regarding these acquisitions is provided in Note 13.
	Intangible asset amortization expense was $44 million for 2013, $23 million for 2012 and $4 million for 2011. Estimated amortization expense for intangible assets for each of the next five years is as follows: 2014 — $37 million; 2015 — $31 million; 2016 — $24 million; 2017 — $18 million; and 2018 — $11 million.

Variable_Interest_Entities

Variable Interest Entities

12 Months Ended

Dec. 31, 2013

Text Block [Abstract]

'

Variable Interest Entities

'

11. Variable Interest Entities

A VIE is a partnership, limited liability company, trust or other legal entity that meets any one of the following criteria:

¿

The entity does not have sufficient equity to conduct its activities without additional subordinated financial support from another party.

¿

The entity’s investors lack the power to direct the activities that most significantly impact the entity’s economic performance.

¿

The entity’s equity at risk holders do not have the obligation to absorb losses or the right to receive residual returns.

¿

The voting rights of some investors are not proportional to their economic interests in the entity, and substantially all of the entity’s activities involve, or are conducted on behalf of, investors with disproportionately few voting rights.

Our VIEs are summarized below. We define a “significant interest” in a VIE as a subordinated interest that exposes us to a significant portion, but not the majority, of the VIE’s expected losses or residual returns, even though we do not have the power to direct the activities that most significantly impact the entity’s economic performance.

Consolidated VIEs

Unconsolidated VIEs

in millions

Total

Total

Total

Total

Maximum

Assets

Liabilities

Assets

Liabilities

Exposure to Loss

31-Dec-13

LIHTC funds

$

22

$

22

$

97

—

—

Education loan securitization trusts

1,980

1,854

N/A

N/A

N/A

LIHTC investments

N/A

N/A

774

—

$

503

Our involvement with VIEs is described below.

Consolidated VIEs

LIHTC guaranteed funds.    KAHC formed limited partnerships known as funds that invested in LIHTC operating partnerships. Interests in these funds were offered in syndication to qualified investors who paid a fee to KAHC for a guaranteed return. We also earned syndication fees from the funds and continue to earn asset management fees. The funds’ assets, primarily investments in LIHTC operating partnerships, totaled $13 million at December 31, 2013. These investments are recorded in “accrued income and other assets” on the balance sheet and serve as collateral for the funds’ limited obligations.

We have not formed new funds or added LIHTC partnerships since October 2003. However, we continue to act as asset manager and to provide occasional funding for existing funds under a guarantee obligation. As a result of this guarantee obligation, we have determined that we are the primary beneficiary of these funds. Additional information on return guarantee agreements with LIHTC investors is presented in Note 20 (“Commitments, Contingent Liabilities and Guarantees”) under the heading “Guarantees.”

In accordance with the applicable accounting guidance for distinguishing liabilities from equity, third-party interests associated with our LIHTC guaranteed funds are considered mandatorily redeemable instruments and are recorded in “accrued expense and other liabilities” on the balance sheet. However, the FASB has indefinitely deferred the measurement and recognition provisions of this accounting guidance for mandatorily redeemable third-party interests associated with finite-lived subsidiaries, such as our LIHTC guaranteed funds. We adjust our financial statements each period for the third-party investors’ share of the funds’ profits and losses. At December 31, 2013, we estimated the settlement value of these third-party interests to be between zero and $11 million, while the recorded value, including reserves, totaled $22 million. The partnership agreement for each of our guaranteed funds requires the fund to be dissolved by a certain date.

Education loan securitization trusts.    In September 2009, we decided to exit the government-guaranteed education lending business. Therefore, we have accounted for this business as a discontinued operation. In the past, as part of our education lending business model, we originated and securitized education loans. As the transferor, we retained a portion of the risk in the form of a residual interest and also retained the right to service the securitized loans and receive servicing fees. We have not securitized any education loans since 2006.

We consolidated our ten outstanding education loan securitization trusts as of January 1, 2010. We were required to consolidate these trusts because we hold the residual interests and, as the master servicer, we have the power to direct the activities that most significantly influence the trusts’ economic performance. We elected to consolidate these trusts at fair value. The trust assets can be used only to settle the obligations or securities that the trusts issue; we cannot sell the assets or transfer the liabilities. The security holders or beneficial interest holders do not have recourse to us, and we do not have any liability recorded related to their securities. Further information regarding these education loan securitization trusts is provided in Note 13 (“Acquisitions and Discontinued Operations”) under the heading “Education lending.”

Unconsolidated VIEs

LIHTC nonguaranteed funds.    Although we hold interests in certain nonguaranteed funds that we formed and funded, we have determined that we are not the primary beneficiary because we do not absorb the majority of the funds’ expected losses and do not have the power to direct activities that most significantly influence the economic performance of these entities. At December 31, 2013, assets of these unconsolidated nonguaranteed funds totaled $97 million. Our maximum exposure to loss in connection with these funds is minimal, and we do not have any liability recorded related to the funds. We have not formed nonguaranteed funds since October 2003.

LIHTC investments.    Through Key Community Bank, we have made investments directly in LIHTC operating partnerships formed by third parties. As a limited partner in these operating partnerships, we are allocated tax credits and deductions associated with the underlying properties. We have determined that we are not the primary beneficiary of these investments because the general partners have the power to direct the activities that most significantly influence the economic performance of their respective partnerships and have the obligation to absorb expected losses and the right to receive benefits. At December 31, 2013, assets of these unconsolidated LIHTC operating partnerships totaled approximately $774 million. At December 31, 2013, our maximum exposure to loss in connection with these partnerships is the unamortized investment balance of $400 million plus $103 million of tax credits claimed but subject to recapture. We do not have any liability recorded related to these investments because we believe the likelihood of any loss is remote. During 2013, we did not obtain significant direct investments (either individually or in the aggregate) in LIHTC operating partnerships.

We have additional investments in unconsolidated LIHTC operating partnerships that are held by the consolidated LIHTC guaranteed funds. Total assets of these operating partnerships were approximately $773 million at December 31, 2013. The tax credits and deductions associated with these properties are allocated to the funds’ investors based on their ownership percentages. We have determined that we are not the primary beneficiary of these partnerships because the general partners have the power to direct the activities that most significantly impact their economic performance and the obligation to absorb expected losses and right to receive residual returns. Information regarding our exposure to loss in connection with these guaranteed funds is included in Note 20 under the heading “Return guarantee agreement with LIHTC investors.”

Commercial and residential real estate investments and principal investments.    Our Principal Investing unit and the Real Estate Capital line of business make equity and mezzanine investments, some of which are in VIEs. These investments are held by nonregistered investment companies subject to the provisions of the AICPA Audit and Accounting Guide, “Audits of Investment Companies.” We are not currently applying the accounting or disclosure provisions in the applicable accounting guidance for consolidations to these investments, which remain unconsolidated. The FASB has indefinitely deferred the effective date of this guidance for such nonregistered investment companies.

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	12. Income Taxes
	Income taxes included in the income statement are summarized below. We file a consolidated federal income tax return.
	Year ended December 31,		2013		2012			2011
	in millions
	Currently payable:
	Federal		$	216	$	178		$	78
	State			26		18			-31
	Total currently payable			242		196			47
	Deferred:
	Federal			39		41			287
	State			-10		-6			30
	Total deferred			29		35			317
	Total income tax (benefit) expense (a)		$	271	$	231		$	364
	(a)	The income tax (benefit) expense on securities transactions totaled $1 million in 2013 and $.4 million in 2011. There was no income tax (benefit) expense on securities transactions in 2012. Income tax expense excludes equity- and gross receipts-based taxes, which are assessed in lieu of an income tax in certain states in which we operate. These taxes, which are recorded in “noninterest expense” on the income statement, totaled $23 million in 2013, $29 million in 2012, and $21 million in 2011.
	Significant components of our deferred tax assets and liabilities included in “accrued income and other assets” and “accrued expense and other liabilities,” respectively, on the balance sheet, are as follows:
	December 31,		2013		2012
	in millions
	Allowance for loan and lease losses		$	334	$	354
	Employee benefits			187		232
	Net unrealized securities losses			45		—
	Federal credit carryforwards			226		339
	State net operating losses and credits			11		15
	Other			302		327
	Gross deferred tax assets			1,105		1,267
	Less: valuation allowance			1		3
	Total deferred tax assets			1,104		1,264
	Leasing transactions			753		830
	Net unrealized securities gains			—		156
	Other			141		156
	Total deferred tax liabilities			894		1,142
	Net deferred tax assets (liabilities) (a)		$	210	$	122
	(a)	From continuing operations
	We conduct quarterly assessments of all available evidence to determine the amount of deferred tax assets that are more-likely-than-not to be realized, and therefore recorded. The available evidence used in connection with these assessments includes taxable income in prior periods, projected future taxable income, potential tax-planning strategies and projected future reversals of deferred tax items. These assessments involve a degree of subjectivity and may undergo significant change. Based on these criteria, we have recorded a valuation allowance of $1 million against the gross deferred tax assets associated with certain state net operating loss carryforwards and state credit carryforwards.
	At December 31, 2013, we had a federal credit carryforward of $226 million. Additionally, we had state net operating loss carryforwards of $136 million and state credit carryforwards of $6 million, resulting in a net state deferred tax asset of $10 million. These carryforwards are subject to limitations imposed by tax laws and, if not utilized, will gradually expire through 2031.
	The following table shows how our total income tax expense (benefit) and the resulting effective tax rate were derived:
	Year ended December 31,		2013					2012					2011
	dollars in millions		Amount		Rate			Amount		Rate			Amount		Rate
	Income (loss) before income taxes times 35%		$	399		35	%	$	376		35.0	%	$	466		35.0	%
	statutory federal tax rate
	Amortization of tax-advantaged investments			63		5.5			64		6.0			65		4.9
	Foreign tax adjustments			(4)		(.3	)		1		.1			17		1.3
	Reduced tax rate on lease financing income			(13)		(1.2	)		(50)		(4.7)			—		—
	Tax-exempt interest income			(15)		(1.3	)		(16)		(1.5)			(16)		(1.2)
	Corporate-owned life insurance income			(42)		(3.7	)		(43)		(4.0)			(42)		(3.2)
	Increase (decrease) in tax reserves			—		—			—		—			2		.2
	Interest refund (net of federal tax benefit)			(1)		(.1	)		—		—			(24)		(1.8)
	State income tax, net of federal tax benefit			10		0.9			8		.7			(1)		(.1)
	Tax credits			(130)		(11.4	)		(119)		(11.1)			(125)		(9.4)
	Other			4		0.3			10		.9			22		1.7
	Total income tax expense (benefit)		$	271		23.7	%	$	231		21.4	%	$	364		27.4	%
	During 2011, we received after-tax interest refunds from the IRS of $23 million related to the timing of tax payments previously made in tax years 2001-2006. Approximately $16 million of this amount was a recovery of interest assessments previously paid that were recorded as part of our tax reserves in prior years.
	Liability for Unrecognized Tax Benefits
	The change in our liability for unrecognized tax benefits is as follows:
	Year ended December 31,		2013		2012
	in millions
	Balance at beginning of year		$	7	$	8
	Decrease related to other settlements with taxing authorities			(1)		(1)
	Balance at end of year		$	6	$	7
	Each quarter, we review the amount of unrecognized tax benefits recorded in accordance with the applicable accounting guidance. Any adjustment to unrecognized tax benefits is recorded in income tax expense. The amount of unrecognized tax benefits that, if recognized, would affect our effective tax rate was $6 million at December 31, 2013, and $7 million at December 31, 2012. We do not currently anticipate that the amount of unrecognized tax benefits will significantly change over the next twelve months.
	As permitted under the applicable accounting guidance, it is our policy to record interest and penalties related to unrecognized tax benefits in income tax expense. We recorded net interest credits of $1.4 million in 2013, interest expense of $.2 million in 2012, and net interest credits of $52 million in 2011. The portion of the respective interest credit attributable to our leveraged lease transactions was $25 million in 2011. We recovered state tax penalties of $.2 million in 2013 and did not recover any penalties in 2012. At December 31, 2013, we had an accrued interest payable of $1.1 million, compared to $1.5 million at December 31, 2012. Our liability for accrued state tax penalties was $.3 million at December 31, 2013, and $.5 million at December 31, 2012.
	We file federal income tax returns, as well as returns in various state and foreign jurisdictions. We are subject to income tax examination by the IRS for the tax years 2009 and forward. Currently, we are under audit for the tax years 2009-2011. As of December 31, 2013, the IRS has not proposed any significant adjustments. We are not subject to income tax examinations by other tax authorities for years prior to 2003.

Acquisition_and_Discontinued_O

Acquisition and Discontinued Operation	12 Months Ended
	Dec. 31, 2013
Business Combinations [Abstract]	'
Acquisition and Discontinued Operation	'
	13. Acquisitions and Discontinued Operations
	Acquisitions
	Mortgage Servicing Rights.    On June 24, 2013, in the first of multiple closings, we acquired substantially all third-party commercial loan servicing rights consisting of CMBS Master, Primary and Special Servicing as well as other servicing from Bank of America’s Global Mortgages & Securitized Products business. Simultaneously, we entered into a subservicing agreement with Berkadia Commercial Mortgage LLC related to all CMBS primary servicing. This acquisition was accounted for as a business combination and aligned with our strategy to drive growth. The acquisition resulted in KeyBank becoming the third largest servicer of commercial/multifamily loans in the U.S. and the fifth largest special servicer of CMBS. The acquisition date fair value of the MSRs acquired on June 24, 2013, which were included on our balance sheet at June 30, 2013, was approximately $117 million. Three additional and related closings occurred on July 22, 2013, August 26, 2013, and October 7, 2013. The acquisition date fair value of the MSRs acquired in these transactions was $3 million. As a result of this acquisition, the total fair value of the MSRs acquired during 2013 and included in our December 31, 2013, financial results was $120 million. In addition to the MSRs acquired, Key as a master servicer acquired $216 million of principal and interest advances. These principal and interest advances recorded at fair value were primarily associated with the June 24, 2013, acquisition of MSRs. No goodwill was recognized as a result of this acquisition. Additional information regarding our mortgage servicing assets is provided in Note 9 (“Mortgage Servicing Assets”).
	Key-Branded Credit Card Portfolio.    On August 1, 2012, we acquired Key-branded credit card assets from Elan Financial Services, Inc. This acquisition was accounted for as an asset purchase. The fair value of the credit card assets purchased was approximately $718 million at the acquisition date. We also recorded a PCCR intangible asset of approximately $135 million and a rewards liability of approximately $9 million in the Community Bank reporting unit.
	Western New York Branches.    On July 13, 2012, we acquired 37 retail banking branches in Western New York. This acquisition was accounted for as a business combination. The acquisition date fair value of the assets and deposits acquired was approximately $2 billion. We received loans with a fair value of $244 million (including $25 million of PCI loans) and premises and equipment valued at $8 million, and assumed $2 billion of deposits. Cash of $1.8 billion was received to assume the net liabilities, and we recorded a core deposit intangible asset of $40 million and a goodwill asset of $62 million in the Key Community Bank reporting unit during the third quarter of 2012. All of the goodwill related to this acquisition is expected to be deductible for tax purposes.
	A second closing of this acquisition occurred on September 14, 2012, when we acquired credit card assets with a fair value of approximately $68 million and remitted a cash payment of $68 million to the seller. We also recorded a PCCR intangible asset of approximately $1 million and a rewards liability of approximately $1 million in the Key Community Bank reporting unit. No additional goodwill resulted from the acquisition of these credit card assets.
	Discontinued operations
	Education lending.    In September 2009, we decided to exit the government-guaranteed education lending business. As a result, we have accounted for this business as a discontinued operation.
	“Income (loss) from discontinued operations, net of taxes” on the income statement includes (i) the changes in fair value of the assets and liabilities of the education loan securitization trusts and the loans at fair value in portfolio (discussed later in this note), and (ii) the interest income and expense from the loans and the securities of the trusts and the loans in portfolio at both amortized cost and fair value. These amounts are shown separately in the following table. Gains and losses attributable to changes in fair value are recorded as a component of noninterest income or expense. Interest income and expense related to the loans and securities are shown as a component of “Net interest income.”
	The components of “income (loss) from discontinued operations, net of taxes” for the education lending business are as follows:
	Year ended December 31,		2013			2012			2011
	in millions
	Net interest income		$	105		$	119		$	138
	Provision (credit) for loan and lease losses			20			9			113
	Net interest income (expense) after provision for loan and lease losses			85			110			25
	Noninterest income			-136			-49			-55
	Noninterest expense			28			36			39
	Income (loss) before income taxes			-79			25			-69
	Income taxes			-29			9			-26
	Income (loss) from discontinued operations, net of taxes (a)		$	-50		$	16		$	-43
	(a)	Includes after-tax charges of $40 million for 2013, $50 million for 2012, and $50 million for 2011, determined by applying a matched funds transfer pricing methodology to the liabilities assumed necessary to support the discontinued operations.
	The discontinued assets and liabilities of our education lending business included on the balance sheet are as follows:
	December 31,		2013			2012
	in millions
	Trust loans at fair value		$	1,960		$	2,369
	Portfolio loans at fair value			147			157
	Loans, net of unearned income of ($6) and ($5)			2,390			2,675
	Less: Allowance for loan and lease losses			39			55
	Net loans			4,458			5,146
	Trust accrued income and other assets at fair value			20			26
	Accrued income and other assets			45			60
	Total assets		$	4,523		$	5,232
	Trust accrued expense and other liabilities at fair value		$	20		$	22
	Trust securities at fair value			1,834			2,159
	Total liabilities		$	1,854		$	2,181
	The discontinued education lending business consists of assets and liabilities in the securitization trusts (recorded at fair value), as well as loans in portfolio (recorded at fair value) and loans in portfolio (recorded at carrying value with appropriate valuation reserves) that are held outside the trusts.
	At December 31, 2013, education loans include 1,041 TDRs with a recorded investment of approximately $13 million (pre-modification and post-modification). A specifically allocated allowance of $1 million was assigned to these loans as of December 31, 2013. There have been no significant payment defaults. There are no significant commitments outstanding to lend additional funds to these borrowers. Additional information regarding TDR classification and ALLL methodology is provided in Note 5 (“Asset Quality”).
	In the past, as part of our education lending business model, we originated and securitized education loans. The process of securitization involved taking a pool of loans from our balance sheet and selling them to a bankruptcy-remote QSPE, or trust. This trust then issued securities to investors in the capital markets to raise funds to pay for the loans. The interest generated on the loans pays holders of the securities issued. As the transferor, we retain a portion of the risk in the form of a residual interest and also retain the right to service the securitized loans and receive servicing fees.
	As of January 1, 2010, we consolidated our ten outstanding securitization trusts since we hold the residual interests and are the master servicer with the power to direct the activities that most significantly influence the economic performance of the trusts.
	The trust assets can be used only to settle the obligations or securities the trusts issue; we cannot sell the assets or transfer the liabilities. The loans in the consolidated trusts consist of both private and government-guaranteed loans. The security holders or beneficial interest holders do not have recourse to Key. Our economic interest or risk of loss associated with these education loan securitization trusts is approximately $126 million as of December 31, 2013. During the third quarter of 2013, additional market participant information about projected trends for default and recovery rates became available. Based on this information and our related internal analysis, we adjusted certain assumptions related to valuing the loans and securities in the securitization trusts. As a result, a $48 million after-tax loss was recognized during the third quarter of 2013 related to the fair value of the loans and securities in the education loan securitization trusts. This loss resulted in a reduction in the value of our economic interest in these trusts. We record all income and expense (including fair value adjustments) through the “income (loss) from discontinued operations, net of tax” line item in our income statement.
	On October 27, 2013, we purchased the government-guaranteed education loans from one of the education loan securitization trusts pursuant to the legal terms of the particular trust. The trust used the cash proceeds from the sale of these loans to retire the outstanding securities related to the government-guaranteed education loans. This particular trust remains in existence and continues to maintain the private education loan portfolio and has securities related to these loans outstanding. On December, 20, 2013, we sold substantially all of the loans we purchased for $147 million and recognized a gain on the sale of $3 million.
	At December 31, 2013, there are $140 million of loans that were purchased from three of the outstanding securitizations trusts pursuant to the legal terms of these particular trusts. These loans are held as portfolio loans and continue to be accounted for at fair value. These portfolio loans were valued using an internal discounted cash flow model, which was affected by assumptions for defaults, loss severity, discount rates and prepayments. These portfolio loans are considered to be Level 3 assets since we rely on unobservable inputs when determining fair value. Our valuation process for these loans as well as the trust loans and securities is discussed in more detail below. Portfolio loans accounted for at fair value had a value of $147 million at December 31, 2013, and $157 million at December 31, 2012.
	We elected to consolidate these trusts at fair value. Carrying the assets and liabilities of the trusts at fair value better depicts our economic interest. The fair value of the assets and liabilities of the trusts is determined by calculating the present value of the future expected cash flows. We rely on unobservable inputs (Level 3) when determining the fair value of the assets and liabilities of the trusts because observable market data is not available. Our valuation process is described in more detail below.
	Corporate Treasury, within our Finance area, is responsible for the quarterly valuation process that determines the fair value of the loans and securities in our education loan securitization trusts as well as our student loans held in portfolio that are accounted for at fair value. Corporate Treasury provides these fair values to a Working Group Committee (“the Working Group”) comprising representatives from the line of business, Credit and Market Risk Management, Accounting, Business Finance (part of our Finance area), and Corporate Treasury. The Working Group is a subcommittee of the Fair Value Committee that is discussed in more detail in Note 6 (“Fair Value Measurements”). The Working Group reviews all significant inputs and assumptions and approves the resulting fair values.
	The Working Group reviews actual performance trends of the loans and securities on a quarterly basis and uses statistical analysis and qualitative measures to determine assumptions for future performance. Predictive models that incorporate delinquency and charge-off trends along with economic outlooks assist the Working Group to forecast future defaults. The Working Group uses this information to formulate the credit outlook for each of the securitization trusts. Higher projected defaults, fewer expected recoveries, elevated prepayment speeds and higher discount rates would be expected to result in a lower fair value of the loans and securities in these securitization trusts as well as the portfolio loans at fair value. Default expectations and discount rate changes have the most significant impact on the fair values of the loans and securities. Increased cash flow uncertainty, whether through higher defaults and prepayments or fewer recoveries, can result in higher discount rates for use in the fair value process for these loans and securities.
	The valuation process for the education loan securitization trust and portfolio loans that are accounted for at fair value is based on a discounted cash flow analysis using a model purchased from a third party that is maintained by Corporate Treasury. The valuation process begins with loan-by-loan level data that is aggregated into pools based on underlying loan structural characteristics (i.e., current unpaid principal balance, contractual term, interest rate). Cash flows for these loan pools are developed using a financial model that reflects certain assumptions for defaults, recoveries, status change and prepayments. A net earnings stream, taking into account cost of funding, is calculated and discounted back to the measurement date using an appropriate discount rate. This resulting amount is used to determine the present value of the loans, which represents their fair value to a market participant.
	The unobservable inputs set forth in the following table are reviewed and approved by the Working Group on a quarterly basis. The Working Group determines these assumptions based on available data, discussions with appropriate individuals within and outside of Key, and the knowledge and experience of the Working Group members.
	A similar discounted cash flow approach to that described above is used on a quarterly basis by Corporate Treasury to determine the fair value of the trust securities. In valuing these securities, the discount rates used are provided by a third-party valuation consultant. These discount rates are based primarily on secondary market spread indices for similar student loans and asset-backed securities and are developed by the consultant using market-based data. On a quarterly basis, the Working Group reviews the discount rate inputs used in the valuation process for reasonableness.
	A quarterly variance analysis reconciles valuation changes in the model used to calculate the fair value of the trust loans and securities and the portfolio loans at fair value. This quarterly analysis considers loan and securities runoff, yields, future default and recovery changes, and the timing of cash releases to us from the trusts. We also perform back testing to compare expected defaults to actual experience; the impact of future defaults can significantly affect the fair value of these loans and securities over time. In addition, our internal model validation group periodically performs a review to ensure the accuracy and validity of the model for determining the fair value of these loans and securities.
	The following table shows the significant unobservable inputs used to measure the fair value of the education loan securitization trust loans and securities and the portfolio loans accounted for at fair value as of December 31, 2013, and 2012:
	December 31, 2013		Fair Value of Level 3			Valuation		Significant	Range
	dollars in millions		Assets and Liabilities			Technique		Unobservable Input	(Weighted-Average)
	Trust loans and		$	2,107		Discounted cash flow		Prepayment speed		4.00 – 13.50%(6.47%)
	portfolio loans							Loss severity		2.00 – 79.50%(54.21%)
	accounted for at fair							Discount rate		2.40 – 10.50%(3.50%)
	value							Default rate		8.01 – 23.71%(18.43%)
	Trust securities			1,834		Discounted cash flow		Discount rate		1.60 – 3.50%(2.55%)
	December 31, 2012		Fair Value of Level 3			Valuation		Significant	Range
	dollars in millions		Assets and Liabilities			Technique		Unobservable Input	(Weighted-Average)
	Trust loans and		$	2,526		Discounted cash flow		Prepayment speed		4.00 – 26.00%(9.74%)
	portfolio loans							Loss severity		2.00 –80.00%(49.61%)
	accounted for at fair							Discount rate		2.40 – 10.50%(5.12%)
	value							Default rate		8.13 –21.50%(13.44%)
Trust securities			2,159		Discounted cash flow		Discount rate		1.50 – 6.10%(4.14%)
The following table shows the principal and fair value amounts for our trust loans at fair value, portfolio loans at fair value, and portfolio loans at carrying value at December 31, 2013, and 2012. Our policies for determining past due loans, placing loans on nonaccrual, applying payments on nonaccrual loans, and resuming accrual of interest are disclosed in Note 1 (“Summary of Significant Accounting Policies”) under the heading “Nonperforming Loans.”
dollars in millions		December 31, 2013						December 31, 2012
		Principal			Fair Value			Principal			Fair Value
Trust loans at fair value
Accruing loans past due 90 days or more		$	25		$	25		$	35		$	34
Loans placed on nonaccrual status			12			12			14			14
Portfolio loans at fair value
Accruing loans past due 90 days or more		$	8		$	8		$	5		$	6
Loans placed on nonaccrual status			—			—			—			—
Portfolio loans at carrying value
Accruing loans past due 90 days or more		$	35			N/A		$	44			N/A
Loans placed on nonaccrual status			10			N/A			6			N/A
The following table shows the consolidated trusts’ assets and liabilities at fair value and the portfolio loans at fair value and their related contractual values as of December 31, 2013, and 2012.
December 31, 2013		Contractual			Fair
in millions		Amount			Value
ASSETS
Portfolio loans		$	140		$	147
Trust loans			1,964			1,960
Trust other assets			20			20
LIABILITIES
Trust securities		$	1,958		$	1,834
Trust other liabilities			20			20
December 31, 2012		Contractual			Fair
in millions		Amount			Value
ASSETS
Portfolio loans		$	151		$	157
Trust loans			2,443			2,369
Trust other assets			26			26
LIABILITIES
Trust securities		$	2,473		$	2,159
Trust other liabilities			22			22
The following tables present the assets and liabilities of the consolidated securitization trusts measured at fair value, as well as the portfolio loans that are measured at fair value on a recurring basis at December 31, 2013, and 2012.
December 31, 2013		Level 1			Level 2			Level 3			Total
in millions
ASSETS MEASURED ON A RECURRING BASIS
Portfolio loans			—			—		$	147		$	147
Trust loans			—			—			1,960			1,960
Trust other assets			—			—			20			20
Total assets on a recurring basis at fair value			—			—		$	2,127		$	2,127
LIABILITIES MEASURED ON A RECURRING BASIS
Trust securities			—			—		$	1,834		$	1,834
Trust other liabilities			—			—			20			20
Total liabilities on a recurring basis at fair value			—			—		$	1,854		$	1,854
December 31, 2012		Level 1			Level 2			Level 3			Total
in millions
ASSETS MEASURED ON A RECURRING BASIS
Portfolio loans			—			—		$	157		$	157
Trust loans			—			—			2,369			2,369
Trust other assets			—			—			26			26
Total assets on a recurring basis at fair value			—			—		$	2,552		$	2,552
LIABILITIES MEASURED ON A RECURRING BASIS
Trust securities			—			—		$	2,159		$	2,159
Trust other liabilities			—			—			22			22
Total liabilities on a recurring basis at fair value			—			—		$	2,181		$	2,181
The following table shows the change in the fair values of the Level 3 consolidated education loan securitization trusts and portfolio loans for the years ended December 31, 2013, and 2012.
in millions		Portfolio			Trust			Trust			Trust			Trust
		Student			Student			Other			Securities			Other
		Loans			Loans			Assets						Liabilities
Balance at December 31, 2011		$	76		$	2,726		$	34		$	2,522		$	28
Gains (losses) recognized in earnings (a)			3			83			—			143			—
Purchases			86			—			—			—			—
Sales			—			(86	)		—			—			—
Issuances			—			—			—			—			—
Settlements			(8	)		(354	)		(8	)		(506	)		(6	)
Balance at December 31, 2012		$	157		$	2,369		$	26		$	2,159		$	22
Gains (losses) recognized in earnings (a)			—			53			—			191			—
Purchases			152			—			—			—			—
Sales			(147	)		(152	)		—			—			—
Issuances			—			—			—			—			—
Settlements			(15	)		(310	)		(6	)		(516	)		(2	)
Balance at December 31, 2013		$	147		$	1,960		$	20		$	1,834		$	20
(a)	Gains (losses) were driven primarily by fair value adjustments.
Victory Capital Management and Victory Capital Advisors.    On July 31, 2013, we completed the sale of Victory to a private equity fund. As a result of this sale, we recorded an after-tax gain of $92 million as of September 30, 2013. The cash portion of the gain was $72 million. An additional gain may be recognized based on client consents received through January 31, 2014. Because it was not certain we could secure these remaining consents, there was no accrual for the consents included in the gain as of December 31, 2013. We are currently waiting to finalize the consents received and the remaining assets under management as of January 31, 2014, in order to be able to recognize any additional gain. Since February 21, 2013, when we agreed to sell Victory, we have accounted for this business as a discontinued operation.
The results of this discontinued business are included in “income (loss) from discontinued operations, net of taxes” on the income statement. The components of “income (loss) from discontinued operations, net of taxes” for Victory, which includes the gain on the sale of this business on July 31, 2013, are as follows:
Year ended December 31,		2013			2012			2011
in millions
Noninterest income		$	212		$	111		$	120
Noninterest expense			66			89			106
Income (loss) before income taxes			146			22			14
Income taxes			54			8			5
Income (loss) from discontinued operations, net of taxes		$	92		$	14		$	9
The discontinued assets and liabilities of Victory included on the balance sheet are as follows:
December 31,		2013			2012
in millions
Cash and due from banks			—		$	1
Accrued income and other assets		$	29			27
Total assets		$	29		$	28
Accrued expense and other liabilities			—		$	38
Total liabilities			—		$	38
The only remaining asset of Victory is a $29 million Seller note that is accounted for at fair value and is classified as a Level 3 asset. The Seller note was accounted for at fair value through December 31, 2013. Since the contingency involving certain fund outflows was resolved, the Seller note will no longer be accounted for at fair value subsequent to December 31, 2013. Corporate Treasury was responsible for the quarterly valuation process that determined the fair value of the Seller note and determined the fair value of the Seller note at closing on December 31, 2013. The Seller note was valued using a discounted cash flow methodology that incorporated an appropriate discount rate based on the credit, market, and interest risks associated with this note. The discount rate used in valuing the Seller note was determined by using the Capital Asset Pricing Model, which was derived using adjusted quarterly changes in the seven-year U.S. Treasury Rate and an average beta of Victory’s peers. The alpha used was equal to the one-year probability of default for similar risk-rated loans calculated under our internal risk rating system and credit policy. The discount rate used for the Seller note at December 31, 2013, was 13.25%. A Mergers & Acquisitions Working Group, which is a subcommittee of the Fair Value Committee that is discussed in more detail in Note 6, reviewed the determination of the discount rate and approved the resulting fair value.
The following table presents the Victory Seller note that is measured at fair value on a recurring basis through December 31, 2013.
December 31, 2013		Level 1			Level 2			Level 3			Total
in millions
ASSETS MEASURED ON A RECURRING BASIS
Seller note			—			—		$	29		$	29
Total assets on a recurring basis at fair value			—			—		$	29		$	29
The following table shows the change in the fair value of the Level 3 Victory Seller note for the year ended December 31, 2013.
in millions		Seller note
Balance at December 31, 2012			—
Gains (losses) recognized in earnings (a)		$	(3	)
Purchases			—
Sales			—
Issuances			32
Settlements			—
Balance at December 31, 2013		$	29
(a)	Gains (losses) were driven primarily by fair value adjustments.
Austin Capital Management, Ltd.    In April 2009, we decided to wind down the operations of Austin, a subsidiary that specialized in managing hedge fund investments for institutional customers. As a result, we have accounted for this business as a discontinued operation.
The results of this discontinued business are included in “income (loss) from discontinued operations, net of taxes” on the income statement. The components of “income (loss) from discontinued operations, net of taxes” for Austin are as follows:
Year ended December 31,		2013			2012			2011
in millions
Noninterest income			—			—		$	1
Noninterest expense		$	1		$	10			2
Income (loss) before income taxes			(1	)		(10	)		(1	)
Income taxes			1			(3	)		—
Income (loss) from discontinued operations, net of taxes		$	(2	)	$	(7	)	$	(1	)
The discontinued assets and liabilities of Austin included on the balance sheet are as follows:
December 31,		2013			2012
in millions
Cash and due from banks		$	20		$	22
Total assets		$	20		$	22
Accrued expense and other liabilities			—		$	1
Total liabilities			—		$	1
Combined discontinued operations.    The combined results of the discontinued operations are as follows:
Year ended December 31,		2013			2012			2011
in millions
Net interest income		$	105		$	119		$	138
Provision (credit) for loan and lease losses			20			9			113
Net interest income (expense) after provision for loan and lease losses			85			110			25
Noninterest income			76			62			66
Noninterest expense			95			135			147
Income (loss) before income taxes			66			37			(56	)
Income taxes			26			14			(21	)
Income (loss) from discontinued operations, net of taxes (a)		$	40		$	23		$	(35	)
(a)	Includes after-tax charges of $40 million for 2013, $50 million for 2012, and $50 million for 2011, determined by applying a matched funds transfer pricing methodology to the liabilities assumed necessary to support the discontinued operations.
The combined assets and liabilities of the discontinued operations are as follows:
December 31,		2013			2012
in millions
Cash and due from banks		$	20		$	23
Trust loans at fair value			1,960			2,369
Portfolio loans at fair value			147			157
Loans, net of unearned income of ($6) and ($5)			2,390			2,675
Less: Allowance for loan and lease losses			39			55
Net loans			4,458			5,146
Trust accrued income and other assets at fair value			20			26
Accrued income and other assets			74			87
Total assets		$	4,572		$	5,282
Trust accrued expense and other liabilities at fair value		$	20		$	22
Accrued expense and other liabilities			—			39
Trust securities at fair value			1,834			2,159
Total liabilities		$	1,854		$	2,220

Security_Financing_Activity

Security Financing Activity	12 Months Ended
	Dec. 31, 2013
Brokers And Dealers [Abstract]	'
Security Financing Activity	'
	14. Securities Financing Activities
	We enter into repurchase and reverse repurchase agreements and securities borrowed transactions (securities financing agreements) primarily to finance our inventory positions, acquire securities to cover short positions, accommodate customers’ financing needs, and 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 at 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. Repurchase agreements and securities borrowed transactions are included in “Accrued income and other assets” on the balance sheet; reverse repurchase agreements are included in “Federal funds purchased and securities sold under repurchase agreements.”
	The following table summarizes our securities financing agreements as of December 31, 2013, and 2012:
			December 31, 2013
	in millions		Gross Amount		Netting			(a)	Collateral  (b)			Net
			Presented in		Adjustments							Amounts
			Balance Sheet
	Offsetting of financial assets:
	Reverse repurchase agreements		$	347	$	(278	)		$	(66	)	$	3
	Securities borrowed			12		—				(12	)		—
	Total		$	359	$	(278	)		$	(78	)	$	3
	Offsetting of financial liabilities:
	Repurchase agreements		$	517	$	(278	)		$	(239	)		—
	Total		$	517	$	(278	)		$	(239	)		—
			31-Dec-12
	in millions		Gross Amount		Netting			(a)	Collateral (b)			Net
			Presented in		Adjustments							Amounts
			Balance Sheet
	Offsetting of financial assets:
	Reverse repurchase agreements		$	271	$	(95	)		$	(172	)	$	4
	Securities borrowed			—		—				—			—
	Total		$	271	$	(95	)		$	(172	)	$	4
	Offsetting of financial liabilities:
	Repurchase agreements		$	228	$	(95	)		$	(133	)		—
	Total		$	228	$	(95	)		$	(133	)		—
	(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.
	Like other financing transactions, securities financing agreements contain an element of credit risk. To mitigate and manage credit risk exposure, we generally enter into master netting agreements and other collateral arrangements that give us the right, in the event of default, to liquidate collateral held and to offset receivables and payables with the same counterparty. Additionally, we establish and monitor limits on our counterparty credit risk exposure by product type. For the reverse repurchase agreements, we monitor the value of the underlying securities we have received from counterparties and either request additional collateral or return a portion of the collateral based on the value of those securities. We generally hold collateral in the form of highly rated securities issued by the U.S. Treasury and fixed income securities. In addition, we may need to provide collateral to counterparties under our repurchase agreements and securities borrowed transactions. In general, the collateral we pledge and receive can be sold or repledged by the secured parties.

StockBased_Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Stock-Based Compensation	'
	15. Stock-Based Compensation
	We maintain several stock-based compensation plans, which are described below. Total compensation expense for these plans was $38 million for 2013, $53 million for 2012, and $41 million for 2011. The total income tax benefit recognized in the income statement for these plans was $14 million for 2013, $20 million for 2012, and $15 million for 2011. Stock-based compensation expense related to awards granted to employees is recorded in “personnel expense” on the income statement; compensation expense related to awards granted to directors is recorded in “other expense.”
	Our compensation plans allow us to grant stock options, stock appreciation rights, restricted stock, restricted stock units, performance shares, performance units, other awards which may not be denominated or payable in or valued by reference to our common shares or other factors, discounted stock purchases, and deferred compensation to eligible employees and directors. At December 31, 2013, we had 89,016,390 common shares available for future grant under our compensation plans. In accordance with a resolution adopted by the Compensation and Organization Committee of KeyCorp’s Board of Directors, we may not grant options to purchase common shares, restricted stock or other shares under any long-term compensation plan in an aggregate amount that exceeds 6% of our outstanding common shares in any rolling three-year period.
	Stock Options
	Stock options granted to employees generally become exercisable at the rate of 25% per year for options granted prior to 2011 and after, and at the rate of 33-1/3% per year for options granted in years prior to 2011. No option granted by KeyCorp will be exercisable less than one year after, or expire later than ten years from, the grant date. The exercise price is the closing price of our common shares on the grant date.
	We determine the fair value of options granted using the Black-Scholes option-pricing model. This model was originally developed to determine the fair value of exchange-traded equity options, which (unlike employee stock options) have no vesting period or transferability restrictions. Because of these differences, the Black-Scholes model does not precisely value an employee stock option, but it is commonly used for this purpose. The model assumes that the estimated fair value of an option is amortized as compensation expense over the option’s vesting period.
	The Black-Scholes model requires several assumptions, which we developed and update based on historical trends and current market observations. Our determination of the fair value of options is only as accurate as the underlying assumptions. The assumptions pertaining to options issued during 2013, 2012, and 2011 are shown in the following table.
	Year ended December 31,		2013			2012			2011
	Average option life			6.3 years			6.3 years			6.2 years
	Future dividend yield			2.14	%		1.5	%		0.43	%
	Historical share price volatility			0.495			0.489			0.479
	Weighted-average risk-free interest rate			1.1	%		1.2	%		2.6	%
	The Compensation and Organization Committee has authority to approve all stock option grants, but may delegate some of its authority to grant awards from time to time under KeyCorp’s 2013 Equity Compensation Plan. The committee has delegated to our Chief Executive Officer the authority to grant equity awards, including stock options, to any employee who is not designated an “officer” for purposes of Section 16 of the Exchange Act. No more than 3,000,000 common shares may be issued under this authority.
	The following table summarizes activity, pricing and other information for our stock options for the year ended December 31, 2013.
			Number of			Weighted-Average			Weighted-Average			Aggregate
			Options			Exercise Price Per			Remaining Life			Intrinsic
						Option			(Years)			Value (a)
	Outstanding at December 31, 2012			32,619,819		$	19.36
	Granted			1,141,294			9.33
	Exercised			(3,574,354	)		7.26
	Lapsed or canceled			(4,480,817	)		24.47
	Outstanding at December 31, 2013			25,705,942		$	19.83			4.2		$	68
	Expected to vest			4,233,326		$	8.51			8.1		$	21
	Exercisable at December 31, 2013			21,042,678		$	22.34			3.3		$	45
	(a)	The intrinsic value of a stock option is the amount by which the fair value of the underlying stock exceeds the exercise price of the option. At December 31, 2013, the fair value of the underlying stock was less than the weighted-average exercise price per option.
	The weighted-average grant-date fair value of options was $3.55 for options granted during 2013, $3.23 for options granted during 2012, and $4.11 for options granted during 2011. Stock option exercises numbered 3,574,354 in 2013, 421,846 in 2012, and 121,089 in 2011. The aggregate intrinsic value of exercised options was $13 million for 2013, $1 million for 2012, and less than $1 million for 2011. As of December 31, 2013, unrecognized compensation cost related to nonvested options expected to vest under the plans totaled $6 million. We expect to recognize this cost over a weighted-average period of 2.3 years.
	Cash received from options exercised was $26 million, $2 million, and $1 million in 2013, 2012, and 2011, respectively. The actual tax benefit realized for the tax deductions from options exercised totaled $1 million for 2013 and less than $1 million for each of 2012 and 2011.
	Long-Term Incentive Compensation Program
	Our Long-Term Incentive Compensation Program (the “Program”) rewards senior executives critical to our long-term financial success. Awards are granted annually in a variety of forms:
	¿	deferred cash payments that generally vest at the rate of 25% per year;
	¿	time-lapsed restricted stock units payable in stock, which generally vest at the rate of 25% per year;
	¿	performance units payable in stock, which vest at the end of the three-year performance cycle and will not vest unless Key attains defined performance levels; and
	¿	performance units payable in cash, which vest at the end of the three-year performance cycle and will not vest unless Key attains defined performance levels.
	No performance units were scheduled to vest during 2013, 2012, and 2011; therefore, no corresponding payments were made.
	The following table summarizes activity and pricing information for the nonvested shares in the Program for the year ended December 31, 2013.
			Vesting Contingent on						Vesting Contingent on
			Service Conditions						Performance and Service
									Conditions
			Number of			Weighted-			Number of			Weighted-
			Nonvested			Average			Nonvested			Average
			Shares			Grant-Date			Shares			Grant-Date
						Fair Value						Fair Value
	Outstanding at December 31, 2012			5,145,713		$	8.27			4,092,563		$	8.21
	Granted			2,452,490			9.33			1,632,641			13.42
	Vested			(2,392,842	)		7.9			(570,125	)		8.01
	Forfeited			(446,985	)		8.9			(511,969	)		11.91
	Outstanding at December 31, 2013			4,758,376		$	8.94			4,643,110		$	11.56
	The compensation cost of time-lapsed and performance-based restricted stock or unit awards granted under the Program is calculated using the closing trading price of our common shares on the grant date.
	Unlike time-lapsed and performance-based restricted stock or units, we do not pay dividends during the vesting period for performance shares or units that may become payable in excess of targeted performance.
	The weighted-average grant-date fair value of awards granted under the Program was $10.96 during 2013, $8.07 during 2012, and $9.12 during 2011. As of December 31, 2013, unrecognized compensation cost related to nonvested shares expected to vest under the Program totaled $43 million. We expect to recognize this cost over a weighted-average period of 2.3 years. The total fair value of shares vested was $23 million in 2013, $8 million during 2012, and $10 million during 2011.
	Other Restricted Stock Awards
	We also may grant, upon approval by the Compensation and Organization Committee (or our Chief Executive Officer with respect to her designated authority), other time-lapsed restricted stock or unit awards under various programs to recognize outstanding performance.
	The following table summarizes activity and pricing information for the nonvested shares granted under these restricted stock or unit awards for the year ended December 31, 2013.
			Number of			Weighted-Average
			Nonvested			Grant-Date
			Shares			Fair Value
	Outstanding at December 31, 2012			2,716,654		$	7.84
	Granted			261,679			9.33
	Vested			(1,588,427	)		7.51
	Forfeited			(23,436	)		8.55
	Outstanding at December 31, 2013			1,366,470		$	8.48
	The weighted-average grant-date fair value of awards granted was $9.33 during 2013, $7.98 during 2012, and $9.25 during 2011. As of December 31, 2013, unrecognized compensation cost related to nonvested restricted stock or units expected to vest under these special awards totaled $4 million. We expect to recognize this cost over a weighted-average period of 2.4 years. The total fair value of restricted stock or units vested was $12 million during 2013, $14 million during 2012, and $29 million during 2011.
	Deferred Compensation Plans
Our deferred compensation arrangements include voluntary and mandatory deferral programs for common shares awarded to certain employees and directors. Mandatory deferred incentive awards vest at the rate of 25% per year beginning one year after the deferral date for awards granted in 2012 and after, and 33-1/3% per year beginning one year after the deferral date for awards granted prior to 2012. Deferrals under the voluntary programs are immediately vested.
Several of our deferred compensation arrangements allow participants to redirect deferrals from common shares into other investments that provide for distributions payable in cash. We account for these participant-directed deferred compensation arrangements as stock-based liabilities and re-measure the related compensation cost based on the most recent fair value of our common shares. The compensation cost of all other nonparticipant-directed deferrals is measured based on the closing price of our common shares on the deferral date. We did not pay any stock-based liabilities during 2013, 2012, or 2011.
The following table summarizes activity and pricing information for the nonvested shares in our deferred compensation plans for the year ended December 31, 2013.
		Number of			Weighted-Average
		Nonvested			Grant-Date
		Shares			Fair Value
Outstanding at December 31, 2012			1,195,849		$	7.00
Granted			774,028			11.18
Dividend equivalents			53,213			11.18
Vested			(661,372	)		8.48
Forfeited			(17,620	)		7.94
Outstanding at December 31, 2013			1,344,098		$	9.06
The weighted-average grant-date fair value of awards granted was $11.18 during 2013, $6.63 during 2012, and $8.03 during 2011. As of December 31, 2013, unrecognized compensation cost related to nonvested shares expected to vest under our deferred compensation plans totaled $6 million. We expect to recognize this cost over a weighted-average period of 2.2 years. The total fair value of shares vested was $7 million during 2013, $7 million during 2012, and $5 million during 2011. Dividend equivalents presented in the preceding table represent the value of dividends accumulated during the vesting period.
Discounted Stock Purchase Plan
Our Discounted Stock Purchase Plan provides employees the opportunity to purchase our common shares at a 10% discount through payroll deductions or cash payments. Purchases are limited to $10,000 in any month and $50,000 in any calendar year, and are immediately vested. To accommodate employee purchases, we either issue treasury shares or acquire common shares on the open market on or around the fifteenth day of the month following the month employee payments are received. We issued 264,775 common shares at a weighted-average cost to the employee of $9.83 during 2013, 301,794 common shares at a weighted-average cost to the employee of $7.30 during 2012, and 297,091 common shares at a weighted-average cost to the employee of $7.71 during 2011.
Information pertaining to our method of accounting for stock-based compensation is included in Note 1 (“Summary of Significant Accounting Policies”) under the heading “Stock-Based Compensation.”

Employee_Benefits

Employee Benefits	12 Months Ended
	Dec. 31, 2013
Compensation And Retirement Disclosure [Abstract]	'
Employee Benefits	'
	16. Employee Benefits
	In accordance with the applicable accounting guidance for defined benefit and other postretirement plans, we measure plan assets and liabilities as of the end of the fiscal year.
	Pension Plans
	Effective December 31, 2009, we amended our cash balance pension plan and other defined benefit plans to freeze all benefit accruals and close the plans to new employees. We will continue to credit participants’ existing account balances for interest until they receive their plan benefits. We changed certain pension plan assumptions after freezing the plans.
	Pre-tax AOCI not yet recognized as net pension cost was $529 million at December 31, 2013, and $681 million at December 31, 2012, consisting entirely of net unrecognized losses. During 2014, we expect to recognize $16 million of net unrecognized losses in pre-tax AOCI as net pension cost.
	During 2013, lump sum payments made under certain pension plans triggered settlement accounting. In accordance with the applicable accounting guidance for defined benefit plans, we performed a remeasurement of the affected plans in conjunction with the settlement and recognized the settlement loss as reflected in the following table.
	The components of net pension cost and the amount recognized in OCI for all funded and unfunded plans are as follows:
	Year ended December 31,		2013			2012			2011
	in millions
	Interest cost on PBO		$	42		$	47		$	57
	Expected return on plan assets			(67	)		(70	)		(81	)
	Amortization of losses			19			16			11
	Settlement loss			27			—			—
	Net pension cost (benefit)		$	21		$	(7	)	$	(13	)
	Other changes in plan assets and benefit obligations recognized in OCI:
	Net (gain) loss		$	(106	)	$	63		$	120
	Amortization of losses			(46	)		(16	)		(11	)
	Total recognized in comprehensive income		$	(152	)	$	47		$	109
	Total recognized in net pension cost and comprehensive income		$	(131	)	$	40		$	96
	The information related to our pension plans presented in the following tables is based on current actuarial reports using measurement dates of December 31, 2013, and 2012.
	The following table summarizes changes in the PBO related to our pension plans.
	Year ended December 31,		2013			2012
	in millions
	PBO at beginning of year		$	1,277		$	1,228
	Interest cost			42			47
	Actuarial losses (gains)			(54	)		86
	Benefit payments			(109	)		(84	)
	PBO at end of year		$	1,156		$	1,277
	The following table summarizes changes in the FVA.
	Year ended December 31,		2013			2012
	in millions
	FVA at beginning of year		$	942		$	918
	Actual return on plan assets			119			92
	Employer contributions			18			16
	Benefit payments			(109	)		(84	)
	FVA at end of year		$	970		$	942
	The following table summarizes the funded status of the pension plans, which equals the amounts recognized in the balance sheets at December 31, 2013, and 2012.
	December 31,		2013			2012
	in millions
	Funded status (a)		$	(186	)	$	(335	)
	Net prepaid pension cost recognized consists of:
	Current liabilities		$	(14	)	$	(14	)
	Noncurrent liabilities			(172	)		(321	)
	Net prepaid pension cost recognized (b)		$	(186	)	$	(335	)
	(a)	The shortage of the FVA under the PBO.
	(b)	Represents the accrued benefit liability of the pension plans.
	At December 31, 2013, our primary qualified cash balance pension plan was sufficiently funded under the requirements of ERISA. Consequently, we are not required to make a minimum contribution to that plan in 2014. We also do not expect to make any significant discretionary contributions during 2014.
	At December 31, 2013, we expect to pay the benefits from all funded and unfunded pension plans as follows: 2014 — $100 million; 2015 — $97 million; 2016 — $104 million; 2017 — $90 million; 2018 — $86 million; and $386 million in the aggregate from 2019 through 2023.
	The ABO for all of our pension plans was $1.2 billion at December 31, 2013, and $1.3 billion at December 31, 2012. As indicated in the table below, collectively our plans had an ABO in excess of plan assets as follows:
	December 31,
	in millions		2013			2012
	PBO		$	1,156		$	1,277
	ABO			1,156			1,277
	Fair value of plan assets			970			942
	To determine the actuarial present value of benefit obligations, we assumed the following weighted-average rates.
	December 31,		2013			2012
	Discount rate			4.25	%		3.25	%
	Compensation increase rate			N/A			N/A
	To determine net pension cost, we assumed the following weighted-average rates.
	Year ended December 31,		2013			2012			2011
	Discount rate			3.25	%		4.00	%		4.75	%
	Compensation increase rate			N/A			N/A			N/A
	Expected return on plan assets			7.25			7.25			7.75
We estimate that we will recognize a $3 million credit in net pension cost for 2014, compared to an expense of $21 million for 2013 and a credit of $7 million for 2012. Costs are expected be less in 2014 than in 2013 unless the 2014 lump sum payments made under our primary qualified cash balance pension plan are greater than the plan’s interest cost component of net pension cost for the year. If this situation occurs during 2014, in accordance with the applicable accounting guidance for defined benefit plans, we will recognize in earnings a portion of the aggregate gain or loss recorded in AOCI. Costs increased in 2013 because the amount of lump sum payments made under certain pension plans triggered settlement accounting, resulting in a settlement loss of $27 million. Costs were less in 2012 than they were in 2013 due to the 2013 settlement loss.
We determine the expected return on plan assets using a calculated market-related value of plan assets that smoothes what might otherwise be significant year-to-year volatility in net pension cost. Changes in the value of plan assets are not recognized in the year they occur. Rather, they are combined with any other cumulative unrecognized asset- and obligation-related gains and losses, and are reflected evenly in the market-related value during the five years after they occur as long as the market-related value does not vary more than 10% from the plan’s FVA.
We estimate that a 25 basis point increase or decrease in the expected return on plan assets would either decrease or increase, respectively, our net pension cost for 2014 by approximately $2 million. Pension cost also is affected by an assumed discount rate. We estimate that a 25 basis point change in the assumed discount rate would change net pension cost for 2014 by approximately $1 million.
We determine the assumed discount rate based on the rate of return on a hypothetical portfolio of high quality corporate bonds with interest rates and maturities that provide the necessary cash flows to pay benefits when due.
The expected return on plan assets is determined by considering a number of factors, the most significant of which are:
	¿		Our expectations for returns on plan assets over the long term, weighted for the investment mix of the assets. These expectations consider, among other factors, historical capital market returns of equity, fixed income, convertible and other securities, and forecasted returns that are modeled under various economic scenarios.
	¿		Historical returns on our plan assets. Based on an annual reassessment of current and expected future capital market returns, our expected return on plan assets was 7.25% for both 2013 and 2012, and 7.75% for 2011. As part of an annual reassessment of current and expected future capital market returns, we deemed a rate of 7.25% to be appropriate in estimating 2014 pension cost.
The investment objectives of the pension funds are developed to reflect the characteristics of the plans, such as pension formulas and cash lump sum distribution features, and the liability profiles created by the plans’ participants. An executive oversight committee reviews the plans’ investment performance at least quarterly, and compares performance against appropriate market indices. The pension funds’ investment objectives are to achieve an annualized rate of return equal to or greater than our expected return on plan assets over ten to twenty-year periods; to realize annual and three- and five-year annualized rates of return consistent with specific market benchmarks at the individual asset class level; and to maximize ten- to twenty-year annualized rates of return while maintaining prudent levels of risk, consistent with our asset allocation policy. The following table shows the asset target allocations prescribed by the pension funds’ investment policies.
Asset Class		Target
		Allocation
		2013
Equity securities			46	%
Fixed income securities			28
Convertible securities			5
Other assets			21
Total			100	%
Equity securities include common stocks of domestic and foreign companies, as well as foreign company stocks traded as American Depositary Shares on U.S. stock exchanges. Debt securities include investments in domestic- and foreign-issued corporate bonds, U.S. government and agency bonds, international government bonds, and mutual funds. Convertible securities include investments in convertible bonds. Other assets include deposits under insurance company contracts and investments in multi-strategy investment funds.
Although the pension funds’ investment policies conditionally permit the use of derivative contracts, we have not entered into any such contracts, and we do not expect to employ such contracts in the future.
The valuation methodologies used to measure the fair value of pension plan assets vary depending on the type of asset, as described below. For an explanation of the fair value hierarchy, see Note 1 (“Summary of Significant Accounting Policies”) under the heading “Fair Value Measurements.”
Equity securities.    Equity securities traded on securities exchanges are valued at the closing price on the exchange or system where the security is principally traded. These securities are classified as Level 1 since quoted prices for identical securities in active markets are available.
Debt securities.    Substantially all debt securities are investment grade and include domestic- and foreign-issued corporate bonds and U.S. government and agency bonds. These securities are valued using evaluated prices based on observable inputs, such as dealer quotes, available trade information, spreads, bids and offers, prepayment speeds, U.S. Treasury curves, and interest rate movements. Debt securities are classified as Level 2.
Mutual funds.    Exchange-traded mutual funds listed or traded on securities exchanges are valued at the closing price on the exchange or system where the security is principally traded. These securities are classified as Level 1 because quoted prices for identical securities in active markets are available. All other investments in mutual funds are valued at their closing net asset values. Because net asset values are based primarily on observable inputs, most notably quoted prices for the underlying assets, these nonexchange-traded investments are classified as Level 2.
Collective investment funds.    Investments in collective investment funds are valued at their closing net asset values. Because net asset values are based primarily on observable inputs, most notably quoted prices for the underlying assets, these investments are classified as Level 2.
Insurance investment contracts and pooled separate accounts.    Deposits under insurance investment contracts and pooled separate accounts with insurance companies do not have readily determinable fair values and are valued using a methodology that is consistent with accounting guidance that allows the plan to estimate fair value based upon net asset value per share (or its equivalent, such as member units or an ownership in partners’ capital to which a proportionate share of net assets is attributed). The significant unobservable input used in estimating fair value is primarily the most recent value of the investment as reported by the insurance company; thus, these investments are classified as Level 3.
Other assets.    Other assets include an investment in a multi-strategy investment fund and an investment in a limited partnership. These investments do not have readily determinable fair values and are valued using a methodology consistent with accounting guidance that allows the plan to estimate fair value based upon net asset value per share (or its equivalent, such as member units or an ownership in partners’ capital to which a proportionate share of net assets is attributed). The significant unobservable input used in estimating fair value is primarily the most recent value of the investment as reported by the investment manager or general partner of the investment fund; thus, these investments are classified as Level 3.
The following tables show the fair values of our pension plan assets by asset class at December 31, 2013, and 2012.
December 31, 2013
in millions		Level 1			Level 2			Level 3			Total
ASSET CLASS
Equity securities:
U.S.		$	216			—			—		$	216
International			24			—			—			24
Debt securities:
Corporate bonds — U.S.			—		$	74			—			74
Corporate bonds — International			—			11			—			11
Government and agency bonds — U.S.			—			73			—			73
Government bonds — International			—			1			—			1
State and municipal bonds			—			3			—			3
Mutual funds:
U.S. equity			11			—			—			11
International equity			34			—			—			34
Fixed income — U.S.			3			—			—			3
Fixed income — International			2			—			—			2
Collective investment funds:
U.S. equity			—			31			—			31
International equity			—			151			—			151
Convertible securities			—			54			—			54
Fixed income securities			—			7			—			7
Short-term investments			—			44			—			44
Emerging markets			—			44			—			44
Real assets			—			112			—			112
Insurance investment contracts and pooled separate accounts			—			—		$	13			13
Other assets			—			—			62			62
Total net assets at fair value		$	290		$	605		$	75		$	970
December 31, 2012
in millions		Level 1			Level 2			Level 3			Total
ASSET CLASS
Equity securities:
U.S.		$	216			—			—		$	216
International			29			—			—			29
Debt securities:
Corporate bonds — U.S.			—		$	73			—			73
Corporate bonds — International			—			10			—			10
Government and agency bonds — U.S.			—			79			—			79
Government bonds — International			—			3			—			3
State and municipal bonds			—			1			—			1
Mutual funds:
U.S. equity			13			—			—			13
International equity			6			2			—			8
Fixed Income — U.S.			4			—			—			4
Fixed Income — International			2			—			—			2
Collective investment funds:
U.S. equity			—			24			—			24
International equity			—			147			—			147
Convertible securities			—			47			—			47
Fixed income securities			—			5			—			5
Short-term investments			—			48			—			48
Emerging markets			—			47			—			47
Real assets			—			118			—			118
Insurance investment contracts and pooled separate accounts			—			—		$	12			12
Other assets			—			—			56			56
Total net assets at fair value		$	270		$	604		$	68		$	942
The following table shows the changes in the fair values of our Level 3 plan assets for the years ended December 31, 2013, and 2012.
in millions		Insurance			Other			Total
		Investment			Assets
		Contracts and
		Pooled
		Separate
		Accounts
Balance at December 31, 2011		$	12		$	4		$	16
Actual return on plan assets:
Relating to assets held at reporting date			1			2			3
Relating to assets sold during the period			—			-3			-3
Purchases			—			55			55
Sales			-1			-2			-3
Balance at December 31, 2012		$	12		$	56		$	68
Actual return on plan assets:
Relating to assets held at reporting date			1			6			7
Balance at December 31, 2013		$	13		$	62		$	75
Other Postretirement Benefit Plans
We sponsor a retiree healthcare plan in which all employees age 55 with five years of service (or employees age 50 with 15 years of service who are terminated under conditions that entitle them to a severance benefit) are eligible to participate. Participant contributions are adjusted annually. Key may provide a subsidy toward the cost of coverage for certain employees hired before 2001 with a minimum of 15 years of service at the time of termination. We use a separate VEBA trust to fund the retiree healthcare plan.
We also maintained a death benefit plan that provided a death benefit for a very limited number of (i) former Key employees who retired from their employment with Key prior to 1994; (ii) former Key employees who elect a grandfathered pension benefit under the KeyCorp Cash Balance Pension Plan; and (iii) Key employees who otherwise were provided a historical death benefit at the time of their termination. The death benefit plan was noncontributory, and was funded by a separate VEBA trust. In the fourth quarter of 2012, we used the assets of the VEBA trust to purchase an insurance policy issued by a third-party insurance provider to fully fund the death benefits under the plan. Death benefits for all grandfathered employees are fully funded, administered, and paid by the third-party insurance provider, and the insurance company accepted all related funding obligations and administrative liability. Consequently, we terminated the death benefit plan and the VEBA trust effective December 31, 2012.
The components of pre-tax AOCI not yet recognized as net postretirement benefit cost are shown below.
December 31,
in millions		2013			2012
Net unrecognized losses (gains)		$	(12	)	$	5
Net unrecognized prior service benefit			(5	)		-7
Total unrecognized AOCI		$	(17	)	$	-2
During 2014, we expect to recognize $2 million of pre-tax AOCI resulting from prior service benefits and net actuarial gains as a reduction of other postretirement benefit cost.
The components of net postretirement benefit cost and the amount recognized in OCI for all funded and unfunded plans are as follows:
December 31,
in millions		2013			2012			2011
Service cost of benefits earned		$	1		$	1		$	1
Interest cost on APBO			3			3			3
Expected return on plan assets			(3	)		(3	)		-3
Amortization of prior service credit			(1	)		(1	)		-1
Net postretirement benefit cost			—			—			—
Other changes in plan assets and benefit obligations recognized in OCI:
Net (gain) loss		$	(17	)	$	(3	)	$	8
Amortization of prior service credit			1			1			1
Total recognized in comprehensive income		$	(16	)	$	(2	)	$	9
Total recognized in net postretirement benefit cost and comprehensive income		$	(16	)	$	(2	)	$	9
The information related to our postretirement benefit plans presented in the following tables is based on current actuarial reports using measurement dates of December 31, 2013, and 2012.
The following table summarizes changes in the APBO.
Year ended December 31,
in millions		2013			2012
APBO at beginning of year		$	74		$	81
Service cost			1			1
Interest cost			3			3
Plan participants’ contributions			1			2
Actuarial losses (gains)			-6			1
Benefit payments			-8			-7
Liability (gain)/loss due to settlement			—			-7
APBO at end of year		$	65		$	74
The following table summarizes changes in FVA.
Year ended December 31,
in millions		2013			2012
FVA at beginning of year		$	51		$	57
Employer contributions			—			-1
Plan participants’contributions			1			2
Benefit payments			-8			-7
Transfer to insurer			—			-7
Actual return on plan assets			13			7
FVA at end of year		$	57		$	51
The following table summarizes the funded status of the postretirement plans, which corresponds to the amounts recognized in the balance sheets at December 31, 2013, and 2012.
December 31,
in millions		2013			2012
Funded status (a)		$	(8	)	$	(23	)
Accrued postretirement benefit cost recognized (b)			(8	)		(23	)
(a)	The shortage of the FVA under the APBO.
(b)	Consists entirely of noncurrent liabilities.
There are no regulations that require contributions to the VEBA trust that funds our retiree healthcare plan, so there is no minimum funding requirement. We are permitted to make discretionary contributions to the VEBA trust, subject to certain IRS restrictions and limitations. We anticipate that our discretionary contributions in 2014, if any, will be minimal.
At December 31, 2013, we expect to pay the benefits from all funded and unfunded other postretirement plans as follows: 2014 — $5 million; 2015 — $5 million; 2016 — $5 million; 2017 — $5 million; 2018 — $5 million; and $23 million in the aggregate from 2019 through 2023.
To determine the APBO, we assumed discount rates of 4.50% at December 31, 2013, and 3.50% at December 31, 2012.
To determine net postretirement benefit cost, we assumed the following weighted-average rates.
Year ended December 31,		2013			2012			2011
Discount rate			3.5	%		4	%		4.75	%
Expected return on plan assets			5.25			5.58			5.45
The realized net investment income for the postretirement healthcare plan VEBA trust is subject to federal income taxes, which are reflected in the weighted-average expected return on plan assets shown above.
Assumed healthcare cost trend rates do not have a material impact on net postretirement benefit cost or obligations since the postretirement plan has cost-sharing provisions and benefit limitations.
We estimate that we will recognize a credit of $1 million in net postretirement benefit cost for 2014, compared to a credit of less than $1 million for 2013 and a cost of less than $1 million for 2012.
We estimate the expected returns on plan assets for the VEBA trust much the same way we estimate returns on our pension funds. The primary investment objectives of the VEBA trust are to obtain a market rate of return and to diversify the portfolio in order to satisfy the trust’s anticipated liquidity requirements. The following table shows the asset target allocation ranges prescribed by the trust’s investment policy.
Asset Class		Target Allocation
		Range
		2013
Equity securities			70 - 90	%
Fixed income securities			0 - 10
Convertible securities			0 - 10
Cash equivalents and other assets			30-Oct
Investments consist of mutual funds and common investment funds that invest in underlying assets in accordance with the target asset allocation ranges shown above. Exchange-traded mutual funds are valued using quoted prices and, therefore, are classified as Level 1. Investments in common investment funds are valued at their closing net asset value. Because net asset values are based primarily on observable inputs, most notably quoted prices for the underlying assets, these nonexchange-traded investments are classified as Level 2.
Although the VEBA trust’s investment policy conditionally permits the use of derivative contracts, we have not entered into any such contracts, and we do not expect to employ such contracts in the future.
The following tables show the fair values of our postretirement plan assets by asset class at December 31, 2013, and 2012.
December 31, 2013
in millions		Level 1			Level 2			Level 3			Total
ASSET CLASS
Mutual funds — U.S. equity		$	6			—			—		$	6
Common investment funds:
U.S. equity			—		$	29			—			29
International equity			—			9			—			9
Convertible securities			—			3			—			3
Fixed income			—			2			—			2
Short-term investments			—			8			—			8
Total net assets at fair value		$	6		$	51			—		$	57
December 31, 2012
in millions		Level 1			Level 2			Level 3			Total
ASSET CLASS
Mutual funds — U.S. equity		$	7			—			—		$	7
Common investment funds:
U.S. equity			—		$	26			—			26
International equity			—			8			—			8
Convertible securities			—			4			—			4
Fixed income			—			2			—			2
Short-term investments			—			4			—			4
Total net assets at fair value		$	7		$	44			—		$	51
The Medicare Prescription Drug, Improvement and Modernization Act of 2003 introduced a prescription drug benefit under Medicare and prescribes a federal subsidy to sponsors of retiree healthcare benefit plans that offer prescription drug coverage that is “actuarially equivalent” to the benefits under Medicare Part D. Based on our application of the relevant regulatory formula, we determined that the prescription drug coverage related to our retiree healthcare benefit plan is not actuarially equivalent to the Medicare benefit for the vast majority of retirees. For the years ended December 31, 2013, and 2012, we did not receive federal subsidies. For the year ended December 31, 2011, federal subsidies received did not have a material effect on our APBO and net postretirement benefit cost.
The Patient Protection and Affordable Care Act and the Education Reconciliation Act of 2010, which were both signed into law in March 2010, changed the tax treatment of the federal subsidies described above. As a result of these laws, these subsidy payments become taxable in tax years beginning after December 31, 2012. The accounting guidance applicable to income taxes requires the impact of a change in tax law to be immediately recognized in the period that includes the enactment date. However, these tax law changes did not affect us, as we did not have a deferred tax asset recorded for Medicare Part D subsidies received.
Employee 401(k) Savings Plan
A substantial number of our employees are covered under a savings plan that is qualified under Section 401(k) of the Internal Revenue Code. The plan permits employees to contribute from 1% to 100% of eligible compensation, with up to 6% being eligible for matching contributions. Commencing January 1, 2010, an automatic enrollment feature was added to the plan for all new employees. The initial default contribution percentage for employees is 2% and will increase by 1% at the beginning of each plan year until the default contribution is 10% for plan years on and after January 1, 2012. The plan also permits us to provide a discretionary annual profit sharing contribution. We accrued a 2% contribution for 2013 and made contributions of 2.4% for 2012 and 3% for 2011 on eligible compensation for employees eligible on the last business day of the respective plan years. We also maintain a deferred savings plan that provides certain employees with benefits they otherwise would not have been eligible to receive under the qualified plan once their compensation for the plan year reached the IRS contribution limits. Total expense associated with the above plans was $68 million in 2013, $68 million in 2012, and $79 million in 2011.

ShortTerm_Borrowings

Short-Term Borrowings	12 Months Ended
	Dec. 31, 2013
Debt Disclosure [Abstract]	'
Short-Term Borrowings	'
	17. Short-Term Borrowings
	Selected financial information pertaining to the components of our short-term borrowings is as follows:
	December 31,
	dollars in millions	2013			2012			2011
	FEDERAL FUNDS PURCHASED
	Balance at year end	$	18		$	8		$	25
	Average during the year		164			111			120
	Maximum month-end balance		1,486			613			844
	Weighted-average rate during the year		0.09	%		0.14	%		0.13	%
	Weighted-average rate at December 31		0.1			0.15			0.08
	SECURITIES SOLD UNDER REPURCHASE AGREEMENTS
	Balance at year end	$	1,516		$	1,601		$	1,686
	Average during the year		1,638			1,703			1,861
	Maximum month-end balance		2,099			2,455			2,286
	Weighted-average rate during the year		0.13	%		0.19	%		0.28	%
	Weighted-average rate at December 31		0.15			0.14			0.25
	OTHER SHORT-TERM BORROWINGS
	Balance at year end	$	343		$	287		$	337
	Average during the year		394			413			619
	Maximum month-end balance		466			599			1,007
	Weighted-average rate during the year		1.89	%		1.69	%		1.84	%
	Weighted-average rate at December 31		2			1.81			1.6
	Rates exclude the effects of interest rate swaps and caps, which modify the repricing characteristics of certain short-term borrowings. For more information about such financial instruments, see Note 8 (“Derivatives and Hedging Activities”).
	As described below and in Note 18 (“Long-Term Debt”), KeyCorp and KeyBank have a number of programs and facilities that support our short-term financing needs. Certain subsidiaries maintain credit facilities with third parties, which provide alternative sources of funding. KeyCorp is the guarantor of some of the third-party facilities.
	Short-term credit facilities.    We maintain cash on deposit in our Federal Reserve account, which has reduced our need to obtain funds through various short-term unsecured money market products. This account, which was maintained at $4.6 billion at December 31, 2013, and the unpledged securities in our investment portfolio provide a buffer to address unexpected short-term liquidity needs. We also have secured borrowing facilities at the Federal Home Loan Bank of Cincinnati and the Federal Reserve Bank of Cleveland to satisfy short-term liquidity requirements. As of December 31, 2013, our unused secured borrowing capacity was $15.5 billion at the Federal Reserve Bank of Cleveland and $3.5 billion at the Federal Home Loan Bank of Cincinnati.

LongTerm_Debt

Long-Term Debt	12 Months Ended
	Dec. 31, 2013
Debt Disclosure [Abstract]	'
Long-Term Debt	'
	18. Long-Term Debt
	The following table presents the components of our long-term debt, net of unamortized discounts and adjustments related to hedging with derivative financial instruments. We use interest rate swaps and caps, which modify the repricing characteristics of certain long-term debt, to manage interest rate risk. For more information about such financial instruments, see Note 8 (“Derivatives and Hedging Activities”).
	December 31,
	dollars in millions		2013		2012
	Senior medium-term notes due through 2021 (a)		$	2,553	$	2,653
	0.988% Subordinated notes due 2028 (b)			162		162
	6.875% Subordinated notes due 2029 (b)			103		117
	7.750% Subordinated notes due 2029 (b)			133		152
	Total parent company			2,951		3,084
	Senior medium-term notes due through 2039 (c)			1,858		129
	Senior Euro medium-term notes due through 2013 (d)			—		26
	7.413% Subordinated remarketable notes due 2027 (e)			270		268
	5.80% Subordinated notes due 2014 (e)			768		803
	4.95% Subordinated notes due 2015 (e)			251		251
	5.45% Subordinated notes due 2016 (e)			544		564
	5.70% Subordinated notes due 2017 (e)			229		241
	4.625% Subordinated notes due 2018 (e)			104		108
	6.95% Subordinated notes due 2028 (e)			298		300
	Lease financing debt due through 2016 (f)			5		9
	Secured borrowing due through 2018 (g)			58		—
	Federal Home Loan Bank advances due through 2036 (h)			224		974
	Investment Fund Financing due through 2052 (i)			90		90
	Total subsidiaries			4,699		3,763
	Total long-term debt		$	7,650	$	6,847
	(a)	The senior medium-term notes had weighted-average interest rates of 3.89% at December 31, 2013, and 5.11% at December 31, 2012. These notes had a combination of fixed and floating interest rates during 2012; however, these notes had fixed interest rates at December 31, 2013, and 2012. One of the three notes can be redeemed one month prior to its maturity date, while the other two notes may not be redeemed prior to their maturity dates.
	(b)	See Note 19 (“Trust Preferred Securities Issued by Unconsolidated Subsidiaries”) for a description of these notes.
	(c)	Senior medium-term notes had weighted-average interest rates of 1.58% at December 31, 2013, and 5.03% at December 31, 2012. These notes had a combination of fixed and floating interest rates. Two of the five notes can be redeemed one month prior to their maturity dates, while the other three notes may not be redeemed prior to their maturity dates. 2013 issuances were at considerably lower rates than existing debt.
	(d)	Senior Euro medium-term notes matured during 2013 and had weighted-average interest rates of .64% at December 31, 2012. These notes had a combination of fixed and floating interest rates based on LIBOR.
	(e)	These notes are all obligations of KeyBank. Only the subordinated remarketable notes due 2027 may be redeemed prior to their maturity dates.
	(f)	Lease financing debt had weighted-average interest rates of 5.99% at December 31, 2013, and 6.20% at December 31, 2012. This category of debt consists primarily of nonrecourse debt collateralized by leased equipment under operating, direct financing and sales-type leases.
	(g)	The secured borrowing had weighted-average interest rates of 4.79% at December 31, 2013. This borrowing is collateralized by commercial lease financing receivables, and principal reductions are based on the cash payments received from the related receivables. Additional information pertaining to these commercial lease financing receivables is included in Note 4 (“Loans and Loans Held for Sale”).
	(h)	Long-term advances from the Federal Home Loan Bank had weighted-average interest rates of 3.47% at December 31, 2013, and 1.09% at December 31, 2012. These advances, which had a combination of fixed and floating interest rates, were secured by real estate loans and securities totaling $337 million at December 31, 2013, and $1.6 billion at December 31, 2012.
	(i)	Investment Fund Financing had a weighted-average interest rate of 2.01% at December 31, 2013, and 2012.
	At December 31, 2013, scheduled principal payments on long-term debt were as follows:
	in millions		Parent		Subsidiaries		Total
	2014			—	$	816	$	816
	2015		$	764		506		1,270
	2016			—		1,243		1,243
	2017			—		255		255
	2018			739		1,101		1,840
	All subsequent years			1,448		778		2,226
	As described below, KeyCorp and KeyBank have a number of programs that support our long-term financing needs.
	Global bank note program and predecessor programs. In August 2012, KeyBank adopted a Global Bank Note Program permitting the issuance of up to $20 billion of notes domestically and abroad. Under the program, KeyBank is authorized to issue notes with original maturities of seven days or more for senior notes or five years or more for subordinated notes. Notes may be denominated in U.S. dollars or in foreign currencies. Amounts outstanding under the program are classified as “long-term debt” on the balance sheet.
	For the purpose of issuing bank notes, the Global Bank Note Program replaces KeyBank’s prior bank note programs and KeyBank’s prior Euro medium-term note program. Amounts outstanding under prior programs remain outstanding in accordance with their original terms and conditions and at their original stated maturities, and are classified as “long-term debt” on the balance sheet.
	On February 1, 2013, KeyBank issued $1 billion of 1.65% Senior Bank Notes due February 1, 2018, under the Global Bank Note Program. On November 26, 2013, KeyBank issued $350 million of 1.10% Senior Notes and $400 million of Floating Rate Senior Notes, each due November 25, 2016. At December 31, 2013, $18.25 billion remained available for future issuance under the Global Bank Note Program.
	KeyCorp shelf registration, including Medium-Term Note Program. KeyCorp has a shelf registration statement on file with the SEC under rules that allow companies to register various types of debt and equity securities without limitations on the aggregate amounts available for issuance. KeyCorp also maintains a Medium-Term Note Program that permits KeyCorp to issue notes with original maturities of nine months or more. On November 13, 2013, KeyCorp issued $750 million of 2.30% Medium-Term Notes due December 13, 2018. At December 31, 2013, KeyCorp had authorized and available for issuance up to $875 million of additional debt securities under the Medium-Term Note Program.
	Actual issuances of capital securities or preferred stock by KeyCorp must be approved by the Board and cannot be objected to by the Federal Reserve.

Trust_Preferred_Securities_Iss

Trust Preferred Securities Issued by Unconsolidated Subsidiaries	12 Months Ended
	Dec. 31, 2013
Text Block [Abstract]	'
Trust Preferred Securities Issued by Unconsolidated Subsidiaries	'
	19. 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.
	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 1 of this report, implement a phase-out of trust preferred securities as Tier 1 capital, consistent with the requirements of the Dodd-Frank Act. For “standardized approach” banking organizations such as Key, the phase-out period begins on January 1, 2015, and by 2016 will require us to treat our mandatorily redeemable trust preferred securities as Tier 2 capital.
	As of December 31, 2013, the trust preferred securities issued by the KeyCorp capital trusts represent $339 million, or 3.4%, of our total qualifying Tier 1 capital, net of goodwill.
	The trust preferred securities, common stock, and related debentures are summarized as follows:
	dollars in millions		Trust Preferred		Common		Principal		Interest Rate			Maturity
			Securities,		Stock		Amount of		of Trust Preferred			of Trust Preferred
			Net of Discount        (a)				Debentures,		Securities and			Securities and
							Net of Discount     (b)		Debentures      (c)			Debentures
	31-Dec-13
	KeyCorp Capital I		$	156	$	6	$	162		0.988	%		2028
	KeyCorp Capital II			99		4		103		6.875			2029
	KeyCorp Capital III			129		4		133		7.75			2029
	Total		$	384	$	14	$	398		4.777	%		—
	31-Dec-12		$	417	$	14	$	431		5.025	%		—
	(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 $44 million at December 31, 2013, and $77 million at December 31, 2012. See Note 8 (“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 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: (a) the principal amount, plus any accrued but unpaid interest, or (b) 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 $44 million at December 31, 2013, and $77 million at December 31, 2012. See Note 8 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. KeyCorp Capital I has a floating interest rate, equal to three-month LIBOR plus 74 basis points, that reprices quarterly. The total interest rates are weighted-average rates.

Commitments_Contingent_Liabili

Commitments, Contingent Liabilities and Guarantees	12 Months Ended
	Dec. 31, 2013
Commitments And Contingencies Disclosure [Abstract]	'
Commitments, Contingent Liabilities and Guarantees	'
	20. Commitments, Contingent Liabilities and Guarantees
	Obligations under Noncancelable Leases
	We are obligated under various noncancelable operating leases for land, buildings and other property, consisting principally of data processing equipment. Rental expense under all operating leases totaled $122 million in 2013, $121 million in 2012, and $120 million in 2011. Minimum future rental payments under noncancelable operating leases at December 31, 2013, are as follows: 2014 — $120 million; 2015 — $114 million; 2016 — $95 million; 2017 — $87 million; 2018 — $71 million; all subsequent years — $411 million.
	Commitments to Extend Credit or Funding
	Loan commitments provide for financing on predetermined terms as long as the client continues to meet specified criteria. These agreements generally carry variable rates of interest and have fixed expiration dates or termination clauses. We typically charge a fee for our loan commitments. Since a commitment may expire without resulting in a loan, our aggregate outstanding commitments may significantly exceed our eventual cash outlay.
	Loan commitments involve credit risk not reflected on our balance sheet. We mitigate exposure to credit risk with internal controls that guide how we review and approve applications for credit, establish credit limits and, when necessary, demand collateral. In particular, we evaluate the creditworthiness of each prospective borrower on a case-by-case basis and, when appropriate, adjust the allowance for credit losses on lending-related commitments. Additional information pertaining to this allowance is included in Note 1 (“Summary of Significant Accounting Policies”) under the heading “Liability for Credit Losses on Lending-Related Commitments,” and in Note 5 (“Asset Quality”).
	The following table shows the remaining contractual amount of each class of commitment related to extending credit or funding principal investments as of December 31, 2013, and 2012. For loan commitments and commercial letters of credit, this amount represents our maximum possible accounting loss if the borrower were to draw upon the full amount of the commitment and subsequently default on payment for the total amount of the outstanding loan.
	December 31,		2013		2012
	in millions
	Loan commitments:
	Commercial and other		$	23,611	$	20,804
	Commercial real estate and construction			2,104		1,537
	Home equity			7,193		7,255
	Credit cards			3,457		3,611
	Total loan commitments			36,365		33,207
	When-issued and to be announced securities commitments			140		96
	Commercial letters of credit			119		100
	Principal investing commitments			75		94
	Liabilities of certain limited partnerships and other commitments			2		5
	Total loan and other commitments		$	36,701	$	33,502
	Legal Proceedings
	Austin Madoff-Related Claims. Austin, a subsidiary that specialized in managing hedge fund investments for institutional customers, determined that its funds had suffered investment losses of up to approximately $186 million resulting from the crimes perpetrated by Bernard L. Madoff and entities that he controlled. The investment losses borne by Austin’s funds stemmed from investments in a certain Madoff-advised hedge fund. Several lawsuits pending against Austin, KeyCorp, Victory and certain employees and former employees (collectively the “KeyCorp defendants”) alleging various claims, including negligence, fraud, breach of fiduciary duties, and violations of federal securities laws and ERISA, were consolidated into one action styled In re Austin Capital Management, Ltd., Securities & Employee Retirement Income Security Act (ERISA) Litigation, pending in the United States District Court for the Southern District of New York. The KeyCorp defendants filed a motion to dismiss all of the claims in the consolidated amended complaint. On December 21, 2012, the court dismissed 14 of the plaintiffs’ 16 claims, including all of the plaintiffs’ securities law and state law claims. The plaintiffs’ two remaining claims are claims under ERISA. Following mediation in October 2013, the parties reached an agreement in principle to settle the litigation, subject to the preparation of definitive settlement documentation and approval by the court following notice to the class members. We believe that the settlement will be covered under our insurance policies and will not have a material impact on our financial condition.
	Metyk litigation. Two putative class actions were filed on September 21, 2010, in the United States District Court for the Northern District of Ohio (the “Northern District of Ohio”). The plaintiffs in these cases sought to represent a class of all participants in our 401(k) Savings Plan and alleged that the defendants in the lawsuit breached fiduciary duties owed to them under ERISA. These two putative class action lawsuits were substantively consolidated with each other in a proceeding styled Thomas Metyk, et al. v. KeyCorp, et al. (“Metyk”). A substantially similar class action, Taylor v. KeyCorp, et al., was dismissed from the Northern District of Ohio on August 12, 2010. This dismissal was affirmed by the United States Court of Appeals for the Sixth Circuit (the “Sixth Circuit”) on May 25, 2012. On January 29, 2013, the Northern District of Ohio entered its order granting the defendants’ motion to dismiss the plaintiffs’ consolidated complaint for failure to state a claim and entered its final judgment terminating the Metyk proceeding. On February 19, 2013, plaintiffs filed a motion to set aside the final judgment and to permit the plaintiffs to file an amended complaint. On April 30, 2013, the Northern District of Ohio denied the motion to set aside the final judgment. Metyk is currently on appeal before the Sixth Circuit.
	Checking Account Overdraft Litigation. KeyBank was named a defendant in a putative class action seeking to represent a national class of KeyBank customers allegedly harmed by KeyBank’s overdraft practices. The case was transferred and consolidated for purposes of pretrial discovery and motion proceedings to a multidistrict proceeding styled In Re: Checking Account Overdraft Litigation pending in the United States District Court for the Southern District of Florida (the “District Court”). KeyBank filed a notice of appeal in regard to the denial of its motion to compel arbitration. On August 21, 2012, the United States Court of Appeals for the Eleventh Circuit (the “Eleventh Circuit”) vacated the District Court’s order denying KeyBank’s motion to compel arbitration and remanded the case for further consideration. On June 21, 2013, KeyBank filed with the District Court its renewed motion to compel arbitration and stay or dismiss litigation. On August 27, 2013, the District Court granted KeyBank’s renewed motion to compel arbitration and dismissed the case. The case is currently on appeal before the Eleventh Circuit.
	Other litigation. In the ordinary course of business, we are subject to various other litigation, investigations and administrative proceedings. These other matters may involve claims for substantial monetary relief. 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 other 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 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 December 31, 2013. 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”).
	December 31, 2013		Maximum Potential		Liability
	in millions		Undiscounted		Recorded
			Future Payments
	Financial guarantees:
	Standby letters of credit		$	10,630	$	72
	Recourse agreement with FNMA			1,360		—
	Return guarantee agreement with LIHTC investors			11		11
	Written put options (a)			2,741		22
	Total		$	14,742	$	105
	(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 (0-30% probability of payment), moderate (31-70% probability of payment), or high (71-100% 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 December 31, 2013, is low.
	Standby letters of credit. KeyBank issues standby letters of credit to address clients’ financing needs. These instruments obligate us to pay a specified third party when a client fails to repay an outstanding loan or debt instrument or fails to perform some contractual nonfinancial obligation. Any amounts drawn under standby letters of credit are treated as loans to the client; they bear interest (generally at variable rates) and pose the same credit risk to us as a loan. At December 31, 2013, our standby letters of credit had a remaining weighted-average life of 3.2 years, with remaining actual lives ranging from less than one year to as many as eleven years.
	Recourse agreement with FNMA. We participate as a lender in the FNMA Delegated Underwriting and Servicing program. 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. At December 31, 2013, the outstanding commercial mortgage loans in this program had a weighted-average remaining term of 7.2 years, and the unpaid principal balance outstanding of loans sold by us as a participant was $4.2 billion. As shown in the preceding table, the maximum potential amount of undiscounted future payments that we could be required to make under this program is equal to approximately one-third of the principal balance of loans outstanding at December 31, 2013. If we are required to make a payment, we would have an interest in the collateral underlying the related commercial mortgage loan; any loss we incur could be offset by the amount of any recovery from the collateral.
	Return guarantee agreement with LIHTC investors. KAHC, a subsidiary of KeyBank, offered limited partnership interests to qualified investors. Partnerships formed by KAHC invested in low-income residential rental properties that qualify for federal low income housing tax credits under Section 42 of the Internal Revenue Code. In certain partnerships, investors paid a fee to KAHC for a guaranteed return that is based on the financial performance of the property and the property’s confirmed LIHTC status throughout a fifteen-year compliance period. Typically, KAHC fulfills these guaranteed returns by distributing tax credits and deductions associated with the specific properties. If KAHC defaults on its obligation to provide the guaranteed return, KeyBank is obligated to make any necessary payments to investors. No recourse or collateral is available to offset our guarantee obligation other than the underlying income stream from the properties and the residual value of the operating partnership interests.
	As shown in the previous table, KAHC maintained a reserve in the amount of $11 million at December 31, 2013, which we believe will be sufficient to cover estimated future obligations under the guarantees. The maximum exposure to loss reflected in the table represents undiscounted future payments due to investors for the return on and of their investments.
	These guarantees have expiration dates that extend through 2018, but KAHC has not formed any new partnerships under this program since October 2003. Additional information regarding these partnerships is included in Note 11 (“Variable Interest Entities”).
	Written put options. In the ordinary course of business, we “write” put options for clients that wish to mitigate their exposure to changes in interest rates and commodity prices. At December 31, 2013, our written put options had an average life of 2.2 years. These instruments are considered to be guarantees, as we are required to make payments to the counterparty (the client) based on changes in an underlying variable that is related to an asset, a liability, or an equity security that the client holds. We are obligated to pay the client if the applicable benchmark interest rate or commodity price is above or below a specified level (known as the “strike rate”). These written put options are accounted for as derivatives at fair value, as further discussed in Note 8 (“Derivatives and Hedging Activities”). We mitigate our potential future payment obligations by entering into offsetting positions with third parties.
	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 8.
	Default guarantees. Some lines of business participate in guarantees that obligate us to perform if the debtor (typically a client) fails to satisfy all of its payment obligations to third parties. We generally undertake these guarantees for one of two possible reasons: either the risk profile of the debtor should provide an investment return, or we are supporting our underlying investment in the debtor. The terms of these default guarantees range from less than one year to as many as 5.5 years; some default guarantees do not have a contractual end date. We do not hold collateral for the default guarantees. If we were required to make a payment under a guarantee, we would receive a pro rata share should the third party collect some or all of the amounts due from the debtor.
	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.
	Liquidity facilities that support asset-backed commercial paper conduits. At December 31, 2013, we did not have any liquidity facilities remaining outstanding with any unconsolidated third-party commercial paper conduits.
	Indemnifications provided in the ordinary course of business. We provide certain indemnifications, primarily through representations and warranties in contracts that we execute in the ordinary course of business in connection with loan and lease sales and other ongoing activities, as well as in connection with purchases and sales of businesses. We maintain reserves, when appropriate, with respect to liability that reasonably could arise as a result of these indemnities.
	Intercompany guarantees. KeyCorp, KeyBank, and certain of our affiliates are parties to various guarantees that facilitate the ongoing business activities of other affiliates. These business activities encompass issuing debt, assuming certain lease and insurance obligations, purchasing or issuing investments and securities, and engaging in certain leasing transactions involving clients.

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Income	12 Months Ended
	Dec. 31, 2013
Text Block [Abstract]	'
Accumulated Other Comprehensive Income	'
	21. Accumulated Other Comprehensive Income
	Our changes in AOCI for the year ended December 31, 2013, are as follows:
	in millions		Unrealized gains			Unrealized gains			Foreign currency			Net pension and			Total
			(losses) on available			(losses) on derivative			translation			postretirement
			for sale securities			financial instruments			adjustment			benefit costs
	Balance at December 31, 2012		$	229		$	18		$	55		$	(426	)	$	(124	)
	Other comprehensive income before reclassification, net of income taxes			(291	)		6			(9	)		78			(216	)
	Amounts reclassified from accumulated other comprehensive income, net of income taxes (a)			(1	)		(35	)		(4	)		28			(12	)
	Net current-period other comprehensive income, net of income taxes			(292	)		(29	)		(13	)		106			(228	)
	Balance at December 31, 2013		$	(63	)	$	(11	)	$	42		$	(320	)	$	(352	)
	(a)	See table below for details about these reclassifications.
	Our reclassifications out of AOCI for the year ended December 31, 2013, are as follows:
	Year ended December 31, 2013		Amount Reclassified from			Affected Line Item in the Statement
			Accumulated Other			Where Net Income is Presented
	in millions		Comprehensive Income
	Unrealized gains (losses) on available for sale securities
	Realized gains		$	1		Other income
				1		Income (loss) from continuing operations before income taxes
				—		Income taxes
			$	1		Income (loss) from continuing operations
	Unrealized gains (losses) on derivative financial instruments
	Interest rate		$	67		Interest income — Loans
	Interest rate			(8	)	Interest expense — Long term debt
	Foreign exchange contracts			(3	)	Other income
				56		Income (loss) from continuing operations before income taxes
				21		Income taxes
			$	35		Income (loss) from continuing operations
	Foreign currency translation adjustment
			$	7		Corporate services income
				7		Income (loss) from continuing operations before income taxes
				3		Income taxes
			$	4		Income (loss) from continuing operations
	Net pension and postretirement benefit costs
	Amortization of losses		$	(46	)	Personnel expense
	Amortization of prior service credit			1		Personnel expense
				(45	)	Income (loss) from continuing operations before income taxes
				(17	)	Income taxes
			$	(28	)	Income (loss) from continuing operations

Shareholders_Equity

Shareholders' Equity	12 Months Ended
	Dec. 31, 2013
Equity [Abstract]	'
Shareholders' Equity	'
	22. Shareholders’ Equity
	Comprehensive Capital Plan
	As authorized by our Board of Directors and pursuant to our 2013 capital plan submitted to and not objected to by the Federal Reserve, we had authority to repurchase up to $426 million of our common shares in the open market or through privately negotiated transactions. Subsequently, we received no objection from the Federal Reserve to use, and our Board approved the use of, the cash portion of the net after-tax gain from the sale of Victory (approximately $72 million) for additional common share repurchases. In 2013, we completed $409 million of common share repurchases under the 2013 capital plan. Common share repurchases under the remaining 2013 capital plan authorization are expected to be executed through the first quarter of 2014. In addition, we completed $65 million of common share repurchases in the first quarter of 2013 under our 2012 capital plan for a total of $474 million of open market common share repurchases during 2013.
	Capital Adequacy
	KeyCorp and KeyBank must meet specific capital requirements imposed by federal banking regulators. Sanctions for failure to meet applicable capital requirements may include regulatory enforcement actions that restrict dividend payments, require the adoption of remedial measures to increase capital, terminate FDIC deposit insurance, and mandate the appointment of a conservator or receiver in severe cases. In addition, failure to maintain a “well capitalized” status affects how regulators evaluate applications for certain endeavors, including acquisitions, continuation and expansion of existing activities, and commencement of new activities, and could make clients and potential investors less confident. As of December 31, 2013, KeyCorp and KeyBank met all regulatory capital requirements.
	Federal banking regulations group FDIC-insured depository institutions to one of five prompt corrective action capital categories: “well capitalized,” “adequately capitalized,” “undercapitalized,” “significantly undercapitalized,” and “critically undercapitalized.” KeyCorp’s affiliate bank, KeyBank, qualified as “well capitalized” at December 31, 2013, because it exceeded the prescribed threshold ratios of 10.00% for total risk-based capital, 6.00% for Tier 1 risk-based capital, and 5.00% for Tier 1 leverage capital, and was not subject to any written agreement, order or directive to meet and maintain a specific capital level for any capital measure. We believe there has not been any change in condition or event since that date that would cause KeyBank’s capital classification to change.
	Bank holding companies are not assigned to any of the five prompt corrective action capital categories applicable to insured depository institutions. However, if those categories applied to bank holding companies, we believe that KeyCorp would satisfy the criteria for a “well capitalized” institution at December 31, 2013. The capital categories defined in the FDIA serve a limited regulatory function and may not accurately represent our overall financial condition or prospects.
	For additional information on capital adequacy, see “Supervision and Regulation” in Item 1 of this report.
		Actual					To Meet Minimum					To Qualify as Well Capitalized
							Capital Adequacy					Under Federal Deposit
							Requirements					Insurance Act
	dollars in millions	Amount		Ratio			Amount		Ratio			Amount		Ratio
	December 31, 2013
	TOTAL CAPITAL TO NET RISK-WEIGHTED ASSETS
	Key	$	11,941		14.33	%	$	6,666		8.00	%		N/A		N/A
	KeyBank (consolidated)		10,451		13.33			6,273		8		$	7,841		10.00	%
	TIER 1 CAPITAL TO NET RISK-WEIGHTED ASSETS
	Key	$	9,968		11.96	%	$	3,333		4	%		N/A		N/A
	KeyBank (consolidated)		8,496		10.83			3,136		4		$	4,705		6	%
	TIER 1 CAPITAL TO AVERAGE QUARTERLY TANGIBLE ASSETS
	Key	$	9,968		11.11	%	$	2,691		3	%		N/A		N/A
	KeyBank (consolidated)		8,496		9.69			3,507		4		$	4,384		5	%
	December 31, 2012
	TOTAL CAPITAL TO NET RISK-WEIGHTED ASSETS
	Key	$	12,066		15.13	%	$	6,379		8	%		N/A		N/A
	KeyBank (consolidated)		10,321		13.73			6,013		8		$	7,516		10	%
	TIER 1 CAPITAL TO NET RISK-WEIGHTED ASSETS
	Key	$	9,689		12.15	%	$	3,189		4	%		N/A		N/A
	KeyBank (consolidated)		7,989		10.63			3,006		4		$	4,510		6	%
	TIER 1 CAPITAL TO AVERAGE QUARTERLY TANGIBLE ASSETS
	Key	$	9,689		11.41	%	$	2,547		3	%		N/A		N/A
	KeyBank (consolidated)		7,989		9.69			3,299		4		$	4,124		5	%

Line_of_Business_Results

Line of Business Results	12 Months Ended
	Dec. 31, 2013
Segment Reporting [Abstract]	'
Line of Business Results	'
	23. Line of Business Results
	The specific lines of business that constitute each of the major business segments (operating segments) are described below.
	Key Community Bank
	Key Community Bank serves individuals and small to mid-sized businesses through its 12-state branch network.
	Individuals are provided branch-based deposit and investment products, personal finance services and loans, including residential mortgages, home equity, credit card and various types of installment loans. In addition, financial, estate and retirement planning, asset management services, and Delaware Trust capabilities are offered to assist high-net-worth clients with their banking, trust, portfolio management, insurance, charitable giving, and related needs.
	Small businesses are provided deposit, investment and credit products, and business advisory services. Mid-sized businesses are provided products and services that include commercial lending, cash management, equipment leasing, investment and employee benefit programs, succession planning, access to capital markets, derivatives, and foreign exchange.
	Key Corporate Bank
	Key Corporate Bank is a full-service corporate and investment bank focused principally on serving the needs of middle market clients in six industry sectors: consumer, energy, healthcare, industrial, public sector and real estate. Key Corporate Bank delivers a broad product 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. Key Corporate Bank is also a significant servicer of commercial mortgage loans and a significant special servicer of CMBS. Key Corporate Bank also delivers many of its product capabilities to clients of Key Community Bank.
	Other Segments
	Other Segments consist of Corporate Treasury, Community Development, Principal Investing and various exit portfolios.
	Reconciling Items
	Total assets included under “Reconciling Items” primarily represent the unallocated portion of nonearning assets of corporate support functions. Charges related to the funding of these assets are part of net interest income and are allocated to the business segments through noninterest expense. Reconciling Items also includes intercompany eliminations and certain items that are not allocated to the business segments because they do not reflect their normal operations.
	The table on the following pages shows selected financial data for our two major business segments for the years ended December 31, 2013, and 2012.
	The information was derived from the internal financial reporting system that we use to monitor and manage our financial performance. GAAP guides financial accounting, but there is no authoritative guidance for “management accounting” — the way we use our judgment and experience to make reporting decisions. Consequently, the line of business results we report may not be comparable to line of business results presented by other companies.
	The selected financial data are based on internal accounting policies designed to compile results on a consistent basis and in a manner that reflects the underlying economics of the businesses. In accordance with our policies:
		¿		Net interest income is determined by assigning a standard cost for funds used or a standard credit for funds provided based on their assumed maturity, prepayment and/or repricing characteristics.
		¿		Indirect expenses, such as computer servicing costs and corporate overhead, are allocated based on assumptions regarding the extent to which each line of business actually uses the services.
		¿		The consolidated provision for loan and lease losses is allocated among the lines of business primarily based on their actual net loan charge-offs, adjusted periodically for loan growth and changes in risk profile. The amount of the consolidated provision is based on the methodology that we use to estimate our consolidated ALLL. This methodology is described in Note 1 (“Summary of Significant Accounting Policies”) under the heading “Allowance for Loan and Lease Losses.”
		¿		Income taxes are allocated based on the statutory federal income tax rate of 35% (adjusted for tax-exempt interest income, income from corporate-owned life insurance, and tax credits associated with investments in low-income housing projects) and a blended state income tax rate (net of the federal income tax benefit) of 2.2%.
		¿		Capital is assigned to each line of business based on regulatory requirements.
	Developing and applying the methodologies that we use to allocate items among our lines of business is a dynamic process. Accordingly, financial results may be revised periodically to reflect enhanced alignment of expense base allocation drivers, changes in the risk profile of a particular business, or changes in our organizational structure.
	Year ended December 31,		Key Community Bank												Key Corporate Bank
	dollars in millions		2013				2012				2011				2013				2012				2011
	SUMMARY OF OPERATIONS
	Net interest income (TE)		$	1,425			$	1,472			$	1,456			$	756			$	770			$	757
	Noninterest income			766				753				750				782				751				742
	Total revenue (TE) (a)			2,191				2,225				2,206				1,538				1,521				1,499
	Provision (credit) for loan and lease losses			156				150				148				(6	)			24				(198	)
	Depreciation and amortization expense			76				55				38				43				55				89
	Other noninterest expense			1,718				1,815				1,716				811				791				736
	Income (loss) from continuing operations before income taxes (TE)			241				205				304				690				651				872
	Allocated income taxes (benefit) and TE adjustments			90				76				113				246				239				318
	Income (loss) from continuing operations			151				129				191				444				412				554
	Income (loss) from discontinued operations, net of taxes			—				—				—				—				—				—
	Net income (loss)			151				129				191				444				412				554
	Less: Net income (loss) attributable to noncontrolling interests			—				—				—				—				3				—
	Net income (loss) attributable to Key		$	151			$	129			$	191			$	444			$	409			$	554
	AVERAGE BALANCES (b)
	Loans and leases		$	29,309			$	27,200			$	25,599			$	20,447			$	18,879			$	17,410
	Total assets (a)			31,628				29,616				27,781				24,361				22,983				21,542
	Deposits			49,723				48,644				47,643				15,778				12,637				10,798
	OTHER FINANCIAL DATA
	Expenditures for additions to long-lived assets (a), (b)		$	6			$	318			$	117			$	9			$	10			$	15
	Net loan charge-offs (b)			147				195				274				1				64				138
	Return on average allocated equity (b)			5.3	%			4.56	%			6.22	%			27.39	%			23.81	%			25.2	%
	Return on average allocated equity			5.3				4.56				6.22				27.39				23.81				25.2
	Average full-time equivalent employees (c)			8,202				8,784				8,399				1,968				1,997				2,006
	(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 has not been adjusted for discontinued operations.
	Other Segments												Total Segments												Reconciling Items									Key
	2013				2012				2011				2013				2012				2011				2013			2012			2011			2013			2012			2011
	$	166			$	39				$             61			$	2,347			$	2,281			$	2,274			$	1		$	7			$           18		$	2,348		$	2,288		$	2,292
		221				375				238				1,769				1,879				1,730				(3	)		(23	)		-42			1,766			1,856			1,688
		387				414				299				4,116				4,160				4,004				(2	)		(16	)		(24	)		4,114			4,144			3,980
		(21	)			55				(5	)			129				229				(55	)			1			—			(5	)		130			229			(60	)
		6				9				18				125				119				145				134			131			125			259			250			270
		67				100				95				2,596				2,706				2,547				(35	)		(138	)		(133	)		2,561			2,568			2,414
		335				250				191				1,266				1,106				1,367				(102	)		(9	)		(11	)		1,164			1,097			1,356
		21				(10	)			(30	)			357				305				401				(63	)		(50	)		(12	)		294			255			389
		314				260				221				909				801				966				(39	)		41			1			870			842			967
		—				—				—				—				—				—				40			23			(35	)		40			23			(35	)
		314				260				221				909				801				966				1			64			(34	)		910			865			932
	—				4				12				—				7				12				—			—			—			—			7			12
$	314			$	256			$	209			$	909			$	794			$	954			$	1		$	64		$	(34	)	$	910		$	858		$	920
$	3,242			$	4,234			$	5,544			$	52,998			$	50,313			$	48,553			$	56		$	49		$	53		$	53,054		$	50,362		$	48,606
	27,676				27,630				31,629				83,665				80,229				80,952				512			613			1,097			84,177			80,842			82,049
	729				703				971				66,230				61,984				59,412				(353	)		(149	)		(149	)		65,877			61,835			59,263
	—				—				—			$	15			$	328			$	132			$	73		$	76		$	79		$	88		$	404		$	211
$	20			$	86			$	129				168				345				541				—			—			—			168			345			541
	46.66	%			32.32	%			22.19	%			17.67	%			14.87	%			15.36	%			(.76	)%		0.85	%		0.02	%		8.44	%		8.21	%		9.32	%
	46.66				32.32				22.19				17.67				14.87				15.36				0.02			1.33			(.84	)		8.83			8.44			8.98
	54				53				75				10,224				10,834				10,480				4,559			4,755			4,901			14,783			15,589			15,381

Condensed_Financial_Informatio

Condensed Financial Information of the Parent Company	12 Months Ended
	Dec. 31, 2013
Condensed Financial Information Of Parent Company Only Disclosure [Abstract]	'
Condensed Financial Information of the Parent Company	'
	24. Condensed Financial Information of the Parent Company
	CONDENSED BALANCE SHEETS
	December 31,		2013			2012
	in millions
	ASSETS
	Cash and due from banks and interest-bearing deposits		$	2,453		$	2,206
	Loans and advances to:
	Banks			90			90
	Nonbank subsidiaries			482			619
	Total loans and advances			572			709
	Investment in subsidiaries:
	Banks			9,310			9,155
	Nonbank subsidiaries			739			707
	Total investment in subsidiaries			10,049			9,862
	Accrued income and other assets			611			1,151
	Total assets		$	13,685		$	13,928
	LIABILITIES
	Accrued expense and other liabilities		$	431		$	573
	Long-term debt due to:
	Subsidiaries			398			431
	Unaffiliated companies			2,553			2,653
	Total long-term debt			2,951			3,084
	Total liabilities			3,382			3,657
	SHAREHOLDERS’ EQUITY (a)			10,303			10,271
	Total liabilities and shareholders’ equity		$	13,685		$	13,928
	(a)	See Key’s Consolidated Statements of Changes in Equity.
	CONDENSED STATEMENTS OF INCOME
	Year ended December 31,
	in millions		2013			2012			2011
	INCOME
	Dividends from subsidiaries:
	Bank subsidiaries		$	600		$	1,775			—
	Nonbank subsidiaries			—			—		$	345
	Interest income from subsidiaries			26			36			67
	Other income			15			66			18
	Total income			641			1,877			430
	EXPENSE
	Interest on long-term debt with subsidiary trusts			14			29			53
	Interest on other borrowed funds			59			86			89
	Personnel and other expense			85			91			178
	Total expense			158			206			320
	Income (loss) before income taxes and equity in net income (loss) less dividends from subsidiaries			483			1,671			110
	Income tax (expense) benefit			40			57			73
	Income (loss) before equity in net income (loss) less dividends from subsidiaries			523			1,728			183
	Equity in net income (loss) less dividends from subsidiaries (a)			387			(863	)		749
	NET INCOME (LOSS)			910			865			932
	Less: Net income attributable to noncontrolling interests			—			7			12
	NET INCOME (LOSS) ATTRIBUTABLE TO KEY		$	910		$	858		$	920
	(a)	Includes results of discontinued operations described in Note 13 (“Acquisitions and Discontinued Operations”).
	CONDENSED STATEMENTS OF CASH FLOWS
	Year ended December 31,
	in millions		2013			2012			2011
	OPERATING ACTIVITIES
	Net income (loss) attributable to Key		$	910		$	858			$      920
	Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
	Deferred income taxes			—			17			(39	)
	Equity in net (income) loss less dividends from subsidiaries (a)			(387	)		863			(749	)
	Net (increase) decrease in other assets			245			(158	)		(130	)
	Net increase (decrease) in other liabilities			103			85			(43	)
	Other operating activities, net			20			13			83
	NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES			891			1,678			42
	INVESTING ACTIVITIES
	Net (increase) decrease in interest-bearing deposits(b)			2,115			(2,048	)		3,207
Purchases of securities available for sale			(14	)		(34	)		(18	)
Proceeds from sales, prepayments and maturities of securities available for sale			39			1			32
Net (increase) decrease in loans and advances to subsidiaries			(4	)		36			939
Net (increase) decrease in investments in subsidiaries			—			—			2
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES			2,136			(2,045	)		4,162
FINANCING ACTIVITIES
Net proceeds from issuance of long-term debt			750			—			1,000
Payments on long-term debt			(750	)		(1,149	)		(1,043	)
Repurchase of Treasury Shares			(474	)		(251	)		—
Series B Preferred Stock — TARP redemption			—			—			(2,500	)
Repurchase of common share warrant			—			—			(70	)
Net proceeds from the issuance of common shares and preferred stock			26			2			604
Cash dividends paid			(217	)		(191	)		(164	)
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES			(665	)		(1,589	)		(2,173	)
NET INCREASE (DECREASE) IN CASH AND DUE FROM BANKS(b)			2,362			(1,956	)		2,031
CASH AND DUE FROM BANKS AT BEGINNING OF YEAR			75			2,031			—
CASH AND DUE FROM BANKS AT END OF YEAR		$	2,437		$	75		$	2,031
(a)	Includes results of discontinued operations described in Note 13 (“Acquisitions and Discontinued Operations”).
(b)	During 2011, we shut down the Eurosweep (interest-bearing) deposit account and moved the deposits to an interest-bearing account within KeyCorp.
KeyCorp paid interest on borrowed funds totaling $76 million in 2013, $118 million in 2012, and $133 million in 2011.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
Organization	'
	Organization
	We are one of the nation’s largest bank-based financial services companies, with consolidated total assets of $92.9 billion at December 31, 2013. We provide deposit, lending, cash management and investment services to individuals and to small and medium-sized businesses through our subsidiary, KeyBank. We also provide a broad range of sophisticated corporate and investment banking products, such as merger and acquisition advice, public and private debt and equity, syndications, and derivatives to middle market companies in selected industries throughout the United States through our subsidiary, KeyBanc Capital Markets. As of December 31, 2013, KeyBank operated 1,028 full-service retail banking branches and 1,335 automated teller machines in 12 states, as well as additional offices, online and mobile banking capabilities, and a telephone banking call center. Additional information pertaining to our two major business segments, Key Community Bank and Key Corporate Bank, is included in Note 23 (“Line of Business Results”).
Use of Estimates	'
	Use of Estimates
	Our accounting policies conform to GAAP and prevailing practices within the financial services industry. We must make certain estimates and judgments when determining the amounts presented in our consolidated financial statements and the related notes. If these estimates prove to be inaccurate, actual results could differ from those reported.
Basis of Presentation	'
	Basis of Presentation
	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 impact 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% generally are carried at cost. Investments held by our registered broker-dealer and investment company subsidiaries (primarily principal investments) are carried at fair value.
	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.
Noncontrolling Interests	'
	Noncontrolling Interests
	Our Principal Investing unit and the Real Estate Capital and Corporate Banking Services line of business have noncontrolling interests that are accounted for in accordance with the applicable accounting guidance, which allows us to report noncontrolling interests in subsidiaries as a component of equity on the balance sheet. “Net income (loss)” on the income statement includes Key’s revenues, expenses, gains and losses, together with revenues, expenses, gains and losses pertaining to the noncontrolling interests. The portion of net results attributable to the noncontrolling interests is disclosed separately on the face of the income statement to arrive at the “net income (loss) attributable to Key.”
Statements of Cash Flows	'
	Statements of Cash Flows
	Cash and due from banks are considered “cash and cash equivalents” for financial reporting purposes.
Loans	'
	Loans
	Loans are carried at the principal amount outstanding, net of unearned income, including net deferred loan fees and costs. We defer certain nonrefundable loan origination and commitment fees, and the direct costs of originating or acquiring loans. The net deferred amount is amortized over the estimated lives of the related loans as an adjustment to the yield.
	Direct financing leases are carried at the aggregate of the lease receivable plus estimated unguaranteed residual values, less unearned income and deferred initial direct fees and costs. Unearned income on direct financing leases is amortized over the lease terms using a method approximating the interest method that produces a constant rate of return. Deferred initial direct fees and costs are amortized over the lease terms as an adjustment to the yield.
	Leveraged leases are carried net of nonrecourse debt. Revenue on leveraged leases is recognized on a basis that produces a constant rate of return on the outstanding investment in the leases, net of related deferred tax liabilities, during the years in which the net investment is positive.
	The residual value component of a lease represents the fair value of the leased asset at the end of the lease term. We rely on industry data, historical experience, independent appraisals and the experience of the equipment leasing asset management team to value lease residuals. Relationships with a number of equipment vendors give the asset management team insight into the life cycle of the leased equipment, pending product upgrades and competing products.
	In accordance with applicable accounting guidance for leases, residual values are reviewed at least annually to determine if an other-than-temporary decline in value has occurred. In the event of such a decline, the residual value is adjusted to its fair value. Impairment charges are included in noninterest expense, while net gains or losses on sales of lease residuals are included in “other income” on the income statement.
Loans Held for Sale	'
	Loans Held for Sale
	Our loans held for sale at December 31, 2013, and December 31, 2012, are disclosed in Note 4 (“Loans and Loans Held for Sale”). These loans, which we originated and intend to sell, are carried at the lower of aggregate cost or fair value. Fair value is determined based on available market data for similar assets, expected cash flows, and appraisals of underlying collateral or the credit quality of the borrower. If a loan is transferred from the loan portfolio to the held-for-sale category, any write-down in the carrying amount of the loan at the date of transfer is recorded as a charge-off. Subsequent declines in fair value are recognized as a charge to noninterest income. When a loan is placed in the held-for-sale category, we stop amortizing the related deferred fees and costs. The remaining unamortized fees and costs are recognized as part of the cost basis of the loan at the time it is sold.
Nonperforming Loans	'
	Nonperforming Loans
	Nonperforming loans are loans for which we do not accrue interest income, and include commercial and consumer loans and leases, as well as current year TDRs and nonaccruing TDR loans from prior years. Nonperforming loans do not include loans held for sale or PCI loans.
	We generally will classify commercial loans as nonperforming and stop accruing interest (i.e., designate the loan “nonaccrual”) when the borrower’s principal or interest payment is 90 days past due or the loan is well-secured and in the process of collection. Commercial loans are also placed on nonaccrual status when payment is not past due but we have serious doubts about the borrower’s ability to comply with existing repayment terms. Once a loan is designated nonaccrual (and as a result impaired), the interest accrued but not collected generally is charged against the ALLL, and payments subsequently received generally are applied to principal. However, if we believe that all principal and interest on a commercial nonaccrual loan ultimately are collectible, interest income may be recognized as received. Commercial loans generally are charged off in full or charged down to the fair value of the underlying collateral when the borrower’s payment is 180 day past due.
	We generally will classify consumer loans as nonperforming and stop accruing interest when the borrower’s payment is 120 days past due, unless the loan is well-secured and in the process of collection. Any second lien home equity loan with an associated first lien that is 120 days or more past due or in foreclosure, or for which the first mortgage delinquency timeframe is unknown, is reported as a nonperforming loan. Secured loans that are discharged through Chapter 7 bankruptcy and not formally re-affirmed are designated as nonperforming and TDRs. Our charge-off policy for most consumer loans takes effect when payments are 120 days past due. Home equity and residential mortgage loans generally are charged down to the fair value of the underlying collateral when payment is 180 days past due. Credit card loans, and similar unsecured products, continue to accrue interest until the account is charged off at 180 days past due.
	Commercial and consumer loans may be returned to accrual status if we are reasonably assured that all contractually due principal and interest are collectible and the borrower has demonstrated a sustained period (generally 6 months) of repayment performance under the contracted terms of the loan and applicable regulation.
Impaired Loans	'
	Impaired Loans
	A nonperforming loan is considered to be impaired and assigned a specific reserve when, based on current information and events, it is probable that we will be unable to collect all amounts due (both principal and interest) according to the contractual terms of the loan agreement.
	All commercial and consumer TDRs regardless of size and all impaired commercial loans with an outstanding balance $2.5 million or greater are individually evaluated for impairment. Nonperforming loans of less than $2.5 million and smaller-balance homogeneous loans (residential mortgage, home equity loans, marine, etc.) are aggregated and collectively evaluated for impairment. The amount of the reserve is estimated based on the criteria outlined in the “Allowance for Loan and Lease Losses” section of this note.
Allowance for Loan and Lease Losses	'
	Allowance for Loan and Lease Losses
	The ALLL represents our estimate of probable credit losses inherent in the loan portfolio at the balance sheet date. We establish the amount of this allowance by analyzing the quality of the loan portfolio at least quarterly, and more often if deemed necessary. When developing and documenting our methodology to determine the ALLL, we segregate our loan portfolio between commercial and consumer loans. We believe these portfolio segments represent the most appropriate level for determining our historical loss experience, as well as the level at which we monitor credit quality and risk characteristics of the portfolios. Commercial loans, which generally have larger individual balances, constitute a significant portion of our total loan portfolio. The consumer portfolio typically includes smaller balance, homogeneous loans.
	We estimate the appropriate level of our ALLL by applying expected loss rates to existing loans with similar risk characteristics. Expected loss rates for commercial loans are derived from a statistical analysis of our historical default and loss severity experience. The analysis utilizes probability of default and loss given default to assign loan grades using our internal risk rating system. Our expected loss rates are reviewed quarterly and updated as necessary. As of December 31, 2013, the probability of default ratings were based on our default data for the period from January 2008 through October 2013, which encompasses the last downturn period as well as some of our more recent credit experience. We adjust expected loss rates based on calculated estimates of the average time period from initial loss indication to the initial loss recorded for an individual loan.
	Expected loss rates for consumer loans are derived from a statistical analysis of our historical default and loss severity experience. Consumer loans are analyzed quarterly in homogeneous product type pools that share similar attributes and are assigned an expected loss rate that represents expected losses over the next 12 months. The estimate of the average time period from initial loss indication to initial loss recorded for consumer loans is one to one and one-half years.
	The ALLL may be adjusted to reflect our current assessment of many qualitative factors that may not be directly measured in the statistical analysis of expected loss, including:
	¿	changes in international, national, regional, and local economic and business conditions;
	¿	changes in the experience, ability and depth of our lending management and staff;
	¿	changes in lending policies and procedures, including changes in underwriting standards and collection, charge-off and recovery practices;
	¿	changes in the nature and volume of the loan portfolio, including the existence and effect of any concentrations of credit, and changes in the level of such concentrations;
	¿	changes in the volume and/or severity of past due, nonaccrual and adversely classified or graded loans; and
	¿	external factors, such as competition, legal developments and regulatory requirements.
	For all commercial and consumer loan TDRs, regardless of size, as well as impaired commercial loans with an outstanding balance of $2.5 million and greater, we conduct further analysis to determine the probable loss content and assign a specific allowance to the loan if deemed appropriate. We estimate the extent of the individual impairment for commercial loans and TDRs by comparing the recorded investment of the loan with the estimated present value of its future cash flows, the fair value of its underlying collateral, or the loan’s observable market price. Secured consumer loan balances of TDRs that are discharged through Chapter 7 bankruptcy and not formally re-affirmed are adjusted to reflect the fair value of the underlying collateral, less costs to sell. Other consumer loan TDRs are combined in homogenous pools and assigned a specific allocation based on the estimated present value of future cash flows using the effective interest rate. A specific allowance also may be assigned — even when sources of repayment appear sufficient — if we remain uncertain about whether the loan will be repaid in full. On at least a quarterly basis, we evaluate the appropriateness of our loss estimation methods to reduce differences between estimated incurred losses and actual losses.
	While quantitative modeling factors such as default probability and expected recovery rates are constantly changing as the financial strength of the borrower and overall economic conditions change, there have been no changes to the accounting policies or methodology we used to estimate the ALLL.
Liability for Credit Losses on Lending-Related Commitments	'
	Liability for Credit Losses on Lending-Related Commitments
	The liability for credit losses inherent in lending-related commitments, such as letters of credit and unfunded loan commitments, is included in “accrued expense and other liabilities” on the balance sheet. This liability totaled $37 million at December 31, 2013, and $29 million at December 31, 2012. We establish the amount of this allowance by considering both historical trends and current market conditions quarterly, or more often if deemed necessary.
Fair Value Measurements	'
	Fair Value Measurements
	We follow the applicable accounting guidance for fair value measurements and disclosures for all applicable financial and nonfinancial assets and liabilities. This guidance defines fair value, establishes a framework for measurement, and addresses disclosures about fair value measurements. Fair value-related guidance applies only when other guidance requires or permits assets or liabilities to be measured at fair value; it does not expand the use of fair value to any new circumstances.
	Accounting guidance defines fair value as the price to sell an asset or transfer a liability in an orderly transaction between market participants in our principal market. In other words, fair value represents an exit price at the measurement date. Market participants are buyers and sellers who are independent, knowledgeable, and willing and able to transact in the principal (or most advantageous) market for the asset or liability being measured. Current market conditions, including imbalances between supply and demand, are considered in determining fair value.
	We value our assets and liabilities based on the principal market where each would be sold (in the case of assets) or transferred (in the case of liabilities). The principal market is the forum with the greatest volume and level of activity. In the absence of a principal market, valuation is based on the most advantageous market (i.e., the market where the asset could be sold at a price that maximizes the amount to be received or the liability transferred at a price that minimizes the amount to be paid). In the absence of observable market transactions, we consider liquidity valuation adjustments to reflect the uncertainty in pricing the instruments.
	In measuring the fair value of an asset, we assume the highest and best use of the asset by a market participant — not just the intended use — to maximize the value of the asset. We also consider whether any credit valuation adjustments are necessary based on the counterparty’s credit quality.
	When measuring the fair value of a liability, we assume that the transfer will not affect the associated nonperformance risk. Nonperformance risk is the risk that an obligation will not be satisfied, and encompasses not only our own credit risk (i.e., the risk that we will fail to meet our obligation), but also other risks such as settlement risk (i.e., the risk that upon termination or sale, the contract will not settle). We consider the effect of our own credit risk on the fair value for any period in which fair value is measured.
	There are three acceptable techniques for measuring fair value: the market approach, the income approach and the cost approach. The appropriate technique for valuing a particular asset or liability depends on the exit market, the nature of the asset or liability being valued, and how a market participant would value the same asset or liability. Ultimately, selecting the appropriate valuation method requires significant judgment, and applying the valuation technique requires sufficient knowledge and expertise.
	Valuation inputs refer to the assumptions market participants would use in pricing a given asset or liability. Inputs can be observable or unobservable. Observable inputs are assumptions based on market data obtained from an independent source. Unobservable inputs are assumptions based on our own information or assessment of assumptions used by other market participants in pricing the asset or liability. Our unobservable inputs are based on the best and most current information available on the measurement date.
	All inputs, whether observable or unobservable, are ranked in accordance with a prescribed fair value hierarchy that gives the highest ranking to quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest ranking to unobservable inputs (Level 3). Fair values for Level 2 assets or liabilities are based on one or a combination of the following factors: (i) quoted market prices for similar assets or liabilities; (ii) observable inputs, such as interest rates or yield curves; or (iii) inputs derived principally from or corroborated by observable market data. The level in the fair value hierarchy ascribed to a fair value measurement in its entirety is based on the lowest level input that is significant to the measurement. We consider an input to be significant if it drives 10% or more of the total fair value of a particular asset or liability. Assets and liabilities may transfer between levels based on the observable and unobservable inputs used at the valuation date, as the inputs may be influenced by certain market conditions. We recognize transfers between levels of the fair value hierarchy at the end of the reporting period.
	Typically, assets and liabilities are considered to be fair valued on a recurring basis if fair value is measured regularly. However, if the fair value measurement of an instrument does not necessarily result in a change in the amount recorded on the balance sheet, assets and liabilities are considered to be fair valued on a nonrecurring basis. This generally occurs when we apply accounting guidance that requires assets and liabilities to be recorded at the lower of cost or fair value, or assessed for impairment.
	At a minimum, we conduct our valuations quarterly. Additional information regarding fair value measurements and disclosures is provided in Note 6 (“Fair Value Measurements”).
Trading Account Assets	'
	Trading Account Assets
	Trading account assets are debt and equity securities, as well as commercial loans that we purchase and hold but intend to sell in the near term. These assets are reported at fair value. Realized and unrealized gains and losses on trading account assets are reported in “investment banking and capital markets income (loss)” on the income statement.
Securities	'
	Securities
	Securities available for sale.  These are securities that we intend to hold for an indefinite period of time but that may be sold in response to changes in interest rates, prepayment risk, liquidity needs or other factors. Securities available for sale are reported at fair value. Unrealized gains and losses (net of income taxes) deemed temporary are recorded in equity as a component of AOCI on the balance sheet. Unrealized losses on equity securities deemed “other-than-temporary,” and realized gains and losses resulting from sales of securities using the specific identification method, are included in “net securities gains (losses)” on the income statement. Unrealized losses on debt securities deemed “other-than-temporary” are included in “net securities gains (losses)” on the income statement or in AOCI in accordance with the applicable accounting guidance, as further described under the heading “Other-than-Temporary Impairments” in this note and in Note 7 (“Securities”).
	“Other securities” held in the available-for-sale portfolio are primarily marketable equity securities that are traded on a public exchange such as the NYSE or NASDAQ.
	Held-to-maturity securities.  These are debt securities that we have the intent and ability to hold until maturity. Debt securities are carried at cost and adjusted for amortization of premiums and accretion of discounts using the interest method. This method produces a constant rate of return on the adjusted carrying amount.
	“Other securities” held in the held-to-maturity portfolio consist of foreign bonds and capital securities.
Other-than-Temporary Impairments	'
	Other-than-Temporary Impairments
	If the amortized cost of a debt security is greater than its fair value and we intend to sell it, or more-likely-than-not will be required to sell it, before the expected recovery of the amortized cost, then the entire impairment is recognized in earnings. If we have no intent to sell the security, or it is more-likely-than-not that we will not be required to sell it, before expected recovery, then the credit portion of the impairment is recognized in earnings, while the remaining portion attributable to factors such as liquidity and interest rate changes is recognized in equity as a component of AOCI on the balance sheet. The credit portion is equal to the difference between the cash flows expected to be collected and the amortized cost of the debt security.
	Generally, if the amortized cost of an equity security is greater than its fair value, the difference is considered to be other-than-temporary.
Other Investments	'
	Other Investments
	Principal investments — investments in equity and mezzanine instruments made by our Principal Investing unit — represented 57% and 59% of other investments at December 31, 2013, and 2012, respectively, and included both direct investments (investments made in a particular company), and indirect investments (investments made through funds that include other investors). Principal investments are predominantly made in privately-held companies and are carried at fair value ($554 million at December 31, 2013, and $627 million at December 31, 2012). Changes in fair values and realized gains and losses on sales of principal investments are reported as “net gains (losses) from principal investing” on the income statement.
	In addition to principal investments, “other investments” include other equity and mezzanine instruments, such as certain real estate-related investments that are carried at fair value, as well as other types of investments that generally are carried at cost. The carrying amounts of the investments carried at cost are adjusted for declines in value if they are considered to be other-than-temporary. These adjustments are included in “net gains (losses) from principal investing” on the income statement.
Repurchase agreements	'
	Repurchase agreements
	We enter into repurchase and reverse repurchase agreements primarily to acquire securities to cover short positions, to accommodate customers’ financing needs, and to settle other securities obligations. Repurchase and reverse repurchase agreements are accounted for as collateralized financing transactions and recorded on our balance sheet at the amounts at which the securities will be subsequently sold or repurchased. The value of our repurchase and reverse repurchase agreements is based on the valuation of the underlying securities, as further described under the “Other assets and liabilities” heading in Note 6 (“Fair Value Measurements”). Fees received in connection with these transactions are recorded in interest income; fees paid are recorded in interest expense.
Derivatives	'
	Derivatives
	In accordance with applicable accounting guidance, all derivatives are recognized as either assets or liabilities on the balance sheet at fair value. The net increase or decrease in derivatives is included in “other operating activities, net” within the statement of cash flows.
	Accounting for changes in fair value (i.e., gains or losses) of derivatives differs depending on whether the derivative has been designated and qualifies as part of a hedge relationship, and further, on the type of hedge relationship. For derivatives that are not designated as hedging instruments, any gain or loss is recognized immediately in earnings. A derivative that is designated and qualifies as a hedging instrument must be designated as a fair value hedge, a cash flow hedge or a hedge of a net investment in a foreign operation.
	A fair value hedge is used to limit exposure to changes in the fair value of existing assets, liabilities and commitments caused by changes in interest rates or other economic factors. The effective portion of a change in the fair value of an instrument designated as a fair value hedge is recorded in earnings at the same time as a change in fair value of the hedged item, resulting in no effect on net income. The ineffective portion of a change in the fair value of such a hedging instrument is recognized in “other income” on the income statement, with no corresponding offset.
	A cash flow hedge is used to minimize the variability of future cash flows that is caused by changes in interest rates or other economic factors. The effective portion of a gain or loss on a cash flow hedge is recorded as a component of AOCI on the balance sheet, and reclassified to earnings in the same period in which the hedged transaction affects earnings. The ineffective portion of a cash flow hedge is included in “other income” on the income statement.
	A net investment hedge is used to hedge the exposure of changes in the carrying value of investments as a result of changes in the related foreign exchange rates. The effective portion of a gain or loss on a net investment hedge is recorded as a component of AOCI on the balance sheet when the terms of the derivative match the notional and currency risk being hedged. The effective portion is subsequently reclassified into income when the hedged transaction affects earnings. The ineffective portion of a net investment hedge is included in “other income” on the income statement.
	Hedge “effectiveness” is determined by the extent to which changes in the fair value of a derivative instrument offset changes in the fair value, cash flows, or carrying value attributable to the risk being hedged. If the relationship between the change in the fair value of the derivative instrument and the change in the hedged item falls within a range considered to be the industry norm, the hedge is considered “highly effective” and qualifies for hedge accounting. A hedge is “ineffective” if the relationship between the changes falls outside the acceptable range. In that case, hedge accounting is discontinued on a prospective basis. Hedge effectiveness is tested at least quarterly.
	Additional information regarding the accounting for derivatives is provided in Note 8 (“Derivatives and Hedging Activities”).
Offsetting Derivative Positions	'
	Offsetting Derivative Positions
	In accordance with the applicable accounting guidance, we take into account the impact of bilateral collateral and master netting agreements that allow us to settle all derivative contracts held with a single counterparty on a net basis, and to offset the net derivative position with the related cash collateral when recognizing derivative assets and liabilities. Additional information regarding derivative offsetting is provided in Note 8.
Servicing Assets	'
	Servicing Assets
	We service commercial real estate loans. Servicing assets related to all commercial real estate loan servicing totaled $332 million at December 31, 2013, and $204 million at December 31, 2012, and are included in “accrued income and other assets” on the balance sheet.
	Servicing assets and liabilities purchased or retained initially are measured at fair value, if practical. When no ready market value (such as quoted market prices, or prices based on sales or purchases of similar assets) is available to determine the fair value of servicing assets, fair value is determined by calculating the present value of future cash flows associated with servicing the loans. This calculation is based on a number of assumptions, including the market cost of servicing, the discount rate, the prepayment rate and the default rate.
	We remeasure our servicing assets using the amortization method at each reporting date. The amortization of servicing assets is determined in proportion to, and over the period of, the estimated net servicing income, and is recorded in “mortgage fees” on the income statement.
	Servicing assets are evaluated quarterly for possible impairment. This process involves classifying the assets based on the types of loans serviced and their associated interest rates, and determining the fair value of each class. If the evaluation indicates that the carrying amount of the servicing assets exceeds their fair value, the carrying amount is reduced by recording a charge to income in the amount of such excess and establishing a valuation allowance. No impairment of servicing assets recorded for the years ended December 31, 2013, 2012, and 2011 was material in amount. Additional information pertaining to servicing assets is included in Note 9 (“Mortgage Servicing Assets”).
Business Combinations	'
	Business Combinations
	We account for our business combinations using the acquisition method of accounting. Under this accounting method, the acquired company’s net assets are recorded at fair value at the date of acquisition, and the results of operations of the acquired company are combined with Key’s results from that date forward. Acquisition costs are expensed when incurred. The difference between the purchase price and the fair value of the net assets acquired (including intangible assets with finite lives) is recorded as goodwill. Our accounting policy for intangible assets is summarized in this note under the heading “Goodwill and Other Intangible Assets.”
	Additional information regarding acquisitions is provided in Note 13 (“Acquisitions and Discontinued Operations”).
Goodwill and Other Intangible Assets	'
	Goodwill and Other Intangible Assets
	Goodwill represents the amount by which the cost of net assets acquired in a business combination exceeds their fair value. Other intangible assets primarily are the net present value of future economic benefits to be derived from the purchase of credit card receivable assets and core deposits. Other intangible assets are amortized on either an accelerated or straight-line basis over periods ranging from seven to thirty years. Goodwill and other types of intangible assets deemed to have indefinite lives are not amortized.
	Relevant accounting guidance provides that goodwill and certain other intangible assets must be subjected to impairment testing at least annually. We perform quantitative goodwill impairment testing in the fourth quarter of each year. Our reporting units for purposes of this testing are our two business segments, Key Community Bank and Key Corporate Bank. Because the strength of the economic recovery remained uncertain during 2013, we continued to monitor the impairment indicators for goodwill and other intangible assets, and to evaluate the carrying amount of these assets quarterly.
	The first step in goodwill impairment testing is to determine the fair value of each reporting unit. This amount is estimated using comparable external market data (market approach) and discounted cash flow modeling that incorporates an appropriate risk premium and earnings forecast information (income approach). If the carrying amount of a reporting unit exceeds its fair value, goodwill impairment may be indicated. In such a case, we would perform a second step of goodwill impairment testing, and we would estimate a hypothetical purchase price for the reporting unit (representing the unit’s fair value). Then we would compare that hypothetical purchase price with the fair value of the unit’s net assets (excluding goodwill). Any excess of the estimated purchase price over the fair value of the reporting unit’s net assets represents the implied fair value of goodwill. If the carrying amount of the reporting unit’s goodwill exceeds the implied fair value of goodwill, the impairment loss represented by this difference is charged to earnings.
	Effective October 1, 2013, and on a prospective basis, the amount of capital being allocated to our reporting units as a proxy for the carrying value will be based on risk-based regulatory capital requirements. Prior year methodology utilized allocated economic equity as a proxy for the carrying value of the reporting units.
	Additional information pertaining to goodwill and other intangible assets is included in Note 10 (“Goodwill and Other Intangible Assets”).
Purchased Loans	'
	Purchased Loans
	We evaluate purchased loans for impairment in accordance with the applicable accounting guidance. Purchased performing loans that do not have evidence of deterioration in credit quality at acquisition are recorded at fair value at the acquisition date. Any premium or discount associated with purchased performing loans is recognized as an expense or income based on the effective yield method of amortization. Purchased loans that have evidence of deterioration in credit quality since origination and for which it is probable, at acquisition, that all contractually required payments will not be collected are deemed PCI. These loans are initially recorded at fair value without recording an allowance for loan losses. Fair value of these loans is determined using market participant assumptions in estimating the amount and timing of both principal and interest cash flows expected to be collected, as adjusted for an estimate of future credit losses and prepayments, and then a market-based discount rate is applied to those cash flows. PCI loans are generally accounted for on a pool basis, with pools formed based on the common characteristics of the loans, such as loan collateral type or loan product type. Each pool is accounted for as a single asset with one composite interest rate and an aggregate expectation of cash flows.
	Under the accounting model for PCI loans, the excess of cash flows expected to be collected over the carrying amount of the loans, referred to as the “accretable amount,” is accreted into interest income over the life of the loans in each pool using the effective yield method. Accordingly, PCI loans are not subject to classification as nonaccrual (and nonperforming) in the same manner as originated loans. Rather, acquired PCI loans are considered to be accruing loans because their interest income relates to the accretable yield recognized at the pool level and not to contractual interest payments at the loan level. The difference between contractually required principal and interest payments and the cash flows expected to be collected, referred to as the “nonaccretable amount,” includes estimates of both the impact of prepayments and future credit losses expected to be incurred over the life of the loans in each pool.
	After we acquire loans determined to be PCI loans, actual cash collections are monitored to determine if they conform to management’s expectations. Revised cash flow expectations are prepared, as necessary. A decrease in expected cash flows in subsequent periods may indicate that the loan pool is impaired, which would require us to establish an allowance for loan losses by recording a charge to the provision for loan losses. An increase in expected cash flows in subsequent periods initially reduces any previously established allowance for loan losses by the increase in the present value of cash flows expected to be collected, and require us to recalculate the amount of accretable yield for the loan pool. The adjustment of accretable yield due to an increase in expected cash flows is accounted for as a change in estimate. The additional cash flows expected to be collected are reclassified from the nonaccretable difference to the accretable yield, and the amount of periodic accretion is adjusted accordingly over the remaining life of the loans in the pool.
	A purchased loan may be resolved either through receipt of payment (in full or in part) from the borrower, the sale of the loan to a third party, or foreclosure of the collateral. If the loan is sold, a gain or loss on sale is recognized and reported within noninterest income based on the difference between the sales proceeds and the carrying amount of the loan. In the case of a foreclosure, an individual loan is removed from the pool at an amount received from its resolution (fair value of the underlying collateral less costs to sell). Any difference between this amount and the loan carrying value is absorbed by the nonaccretable difference established for the entire pool. For loans resolved by payment in full, there is no difference between the amount received at resolution and the outstanding balance of the loan. In these cases, the remaining accretable amount balance is unaffected and any material change in remaining effective yield caused by removing the loan from the pool is addressed in connection with the subsequent cash flow re-assessment for the pool. PCI loans subject to modification are not removed from the pool even if those loans would otherwise be deemed TDRs since the pool, and not the individual loan, represents the unit of account.
Premises and Equipment	'
	Premises and Equipment
	Premises and equipment, including leasehold improvements, are stated at cost less accumulated depreciation and amortization. We determine depreciation of premises and equipment using the straight-line method over the estimated useful lives of the particular assets. Leasehold improvements are amortized using the straight-line method over the terms of the leases. Accumulated depreciation and amortization on premises and equipment totaled $1.2 billion at December 31, 2013, and 2012.
Internally Developed Software	'
	Internally Developed Software
	We rely on company personnel and independent contractors to plan, develop, install, customize and enhance computer systems applications that support corporate and administrative operations. Software development costs, such as those related to program coding, testing, configuration and installation, are capitalized and included in “accrued income and other assets” on the balance sheet. The resulting asset ($60 million at December 31, 2013, and $53 million at December 31, 2012) is amortized using the straight-line method over its expected useful life (not to exceed five years). Costs incurred during the planning and post-development phases of an internal software project are expensed as incurred.
	Software that is no longer used is written off to earnings immediately. When we decide to replace software, amortization of the phased-out software is accelerated to the expected replacement date.
Guarantees	'
	Guarantees
	In accordance with the applicable accounting guidance, we recognize liabilities, which are included in “accrued expense and other liabilities” on the balance sheet, for the fair value of our obligations under certain guarantees issued.
	If we receive a fee for a guarantee requiring liability recognition, the amount of the fee represents the initial fair value of the “stand ready” obligation. If there is no fee, the fair value of the stand ready obligation is determined using expected present value measurement techniques, unless observable transactions for comparable guarantees are available. The subsequent accounting for these stand ready obligations depends on the nature of the underlying guarantees. We account for our release from risk under a particular guarantee when the guarantee expires or is settled, or by a systematic and rational amortization method, depending on the risk profile of the guarantee.
	Additional information regarding guarantees is included in Note 20 (“Commitments, Contingent Liabilities and Guarantees”) under the heading “Guarantees.”
Revenue Recognition	'
	Revenue Recognition
	We recognize revenues as they are earned based on contractual terms, as transactions occur, or as services are provided and collectibility is reasonably assured. Our principal source of revenue is interest income, which is recognized on an accrual basis primarily according to nondiscretionary formulas in written contracts, such as loan agreements or securities contracts.
Stock-Based Compensation	'
	Stock-Based Compensation
	Stock-based compensation is measured using the fair value method of accounting. The measured cost is recognized over the period during which the recipient is required to provide service in exchange for the award. We estimate expected forfeitures when stock-based awards are granted and record compensation expense only for awards that are expected to vest.
	We recognize compensation cost for stock-based, mandatory deferred incentive compensation awards using the accelerated method of amortization over a period of approximately five years (the current year performance period and a four-year vesting period, which generally starts in the first quarter following the performance period) for awards granted in 2012 and after, and over a period of approximately four years (the current year performance period and a three-year vesting period, which generally starts in the first quarter following the performance period) for awards granted prior to 2012.
	Employee stock options typically become exercisable at the rate of 25% per year for options granted in 2011 and after, or 33-1/3% per year for options granted prior to 2011, beginning one year after the grant date. Options expire no later than ten years after their grant date. We recognize stock-based compensation expense for stock options with graded vesting using an accelerated method of amortization.
	We use shares repurchased under our annual capital plan submitted to our regulators (treasury shares) for share issuances under all stock-based compensation programs other than the discounted stock purchase plan. Shares issued under the discounted stock purchase plan are purchased on the open market.
	We estimate the fair value of options granted using the Black-Scholes option-pricing model, as further described in Note 15 (“Stock-Based Compensation”).
Marketing Cost	'
	Marketing Costs
	We expense all marketing-related costs, including advertising costs, as incurred.

Earning_Per_Common_Share_Table

Earning Per Common Share (Tables)	12 Months Ended
	Dec. 31, 2013
Earnings Per Share [Abstract]	'
Basic and Diluted Earnings Per Common Share	'
	Our basic and diluted earnings per common share are calculated as follows:
	Year ended December 31,
	dollars in millions, except per share amounts		2013		2012		2011
	EARNINGS
	Income (loss) from continuing operations		$	870	$	842	$	967
	Less: Net income (loss) attributable to noncontrolling interests			—		7		12
	Income (loss) from continuing operations attributable to Key			870		835		955
	Less:  Dividends on Series A Preferred Stock			23		22		23
	Cash dividends on Series B Preferred Stock			—		—		31
	Amortization of discount on Series B Preferred Stock (a)			—		—		53
	Income (loss) from continuing operations attributable to Key common shareholders			847		813		848
	Income (loss) from discontinued operations, net of taxes (b)			40		23		(35)
	Net income (loss) attributable to Key common shareholders		$	887	$	836	$	813
	WEIGHTED-AVERAGE COMMON SHARES
	Weighted-average common shares outstanding (000)			906,524		938,941		931,934
	Effect of dilutive convertible preferred stock, common stock options and other stock awards (000)			6,047		4,318		3,867
	Weighted-average common shares and potential common shares outstanding (000)			912,571		943,259		935,801
	EARNINGS PER COMMON SHARE
	Income (loss) from continuing operations attributable to Key common shareholders		$	.93	$	.87	$	.91
	Income (loss) from discontinued operations, net of taxes (b)			.04		.02		(.04)
	Net income (loss) attributable to Key common shareholders (c)			.98		.89		.87
	Income (loss) from continuing operations attributable to Key common shareholders —		$	.93	$	.86	$	.91
	assuming dilution
	Income (loss) from discontinued operations, net of taxes (b)			.04		.02		(.04)
	Net income (loss) attributable to Key common shareholders — assuming dilution (c)			.97		.89		.87
	(a)	Includes a $49 million deemed dividend recorded in the first quarter of 2011 related to the repurchase of the $2.5 billion Series B Preferred Stock.
	(b)	In April 2009, we decided to wind down the operations of Austin, a subsidiary that specialized in managing hedge fund investments for institutional customers. In September 2009, we decided to discontinue the education lending business conducted through Key Education Resources, the education payment and financing unit of KeyBank. In February 2013, we decided to sell Victory to a private equity fund. As a result of these decisions, we have accounted for these businesses as discontinued operations. For further discussion regarding the income (loss) from discontinued operations, see Note 13 (“Acquisitions and Discontinued Operations”).
	(c)	EPS may not foot due to rounding.

Loans_and_Loans_Held_for_Sale_

Loans and Loans Held for Sale (Tables)	12 Months Ended
	Dec. 31, 2013
Text Block [Abstract]	'
Loans by Category	'
	Our loans by category are summarized as follows:
	December 31,
	in millions		2013		2012
	Commercial, financial and agricultural (a)		$	24,963	$	23,242
	Commercial real estate:
	Commercial mortgage			7,720		7,720
	Construction			1,093		1,003
	Total commercial real estate loans			8,813		8,723
	Commercial lease financing (b)			4,551		4,915
	Total commercial loans			38,327		36,880
	Residential — Prime Loans:
	Real estate — residential mortgage			2,187		2,174
	Home equity:
	Key Community Bank			10,340		9,816
	Other			334		423
	Total home equity loans			10,674		10,239
	Total residential — prime loans			12,861		12,413
	Consumer other — Key Community Bank			1,449		1,349
	Credit cards			722		729
	Consumer other:
	Marine			1,028		1,358
	Other			70		93
	Total consumer other			1,098		1,451
	Total consumer loans			16,130		15,942
	Total loans (c) (d)		$	54,457	$	52,822
	(a)	December 31, 2013, and December 31, 2012, loan balances include $94 million and $90 million of commercial credit card balances, respectively.
	(b)	December 31, 2013, commercial lease financing includes receivables of $58 million held as collateral for a secured borrowing. Additional information pertaining to this secured borrowing is included in Note 18 (“Long-Term Debt”).
	(c)	December 31, 2013, total loans include purchased loans of $166 million, of which $16 million were PCI loans. December 31, 2012, total loans include purchased loans of $217 million, of which $23 million were PCI loans.
	(d)	Excludes loans in the amount of $4.5 billion at December 31, 2013, and $5.2 billion at December 31, 2012, related to the discontinued operations of the education lending business.
Loans Held for Sale	'
	Our loans held for sale by category are summarized as follows:
	December 31,
	in millions		2013		2012
	Commercial, financial and agricultural		$	278	$	29
	Real estate — commercial mortgage			307		477
	Commercial lease financing			9		8
	Real estate — residential mortgage			17		85
	Total loans held for sale		$	611	$	599
Summary of Changes in Loans Held for Sale	'
	Our summary of changes in loans held for sale follows:
	Year ended December 31,
	in millions		2013		2012
	Balance at beginning of the period		$	599	$	728
	New originations			5,452		5,209
	Transfers from held to maturity, net			52		77
	Loan sales			(5,480)		(5,391)
	Loan draws (payments), net			(12)		(20)
	Transfers to OREO / valuation adjustments			—		(4)
	Balance at end of period		$	611	$	599
Composition of Net Investment in Direct Financing Leases	'
	The composition of the net investment in direct financing leases is as follows:
	December 31,
	in millions		2013		2012
	Direct financing lease receivables		$	3,176	$	3,429
	Unearned income			(219)		(260)
	Unguaranteed residual value			231		261
	Deferred fees and costs			21		25
	Net investment in direct financing leases		$	3,209	$	3,455

Asset_Quality_Tables

Asset Quality (Tables)	12 Months Ended
	Dec. 31, 2013
Receivables [Abstract]	'
Nonperforming Assets and Past Due Loans	'
	Our nonperforming assets and past due loans were as follows:
	December 31,
	in millions		2013			2012
	Total nonperforming loans (a), (b)		$	508		$	674
	Nonperforming loans held for sale			1			25
	OREO			15			22
	Other nonperforming assets			7			14
	Total nonperforming assets		$	531		$	735
	Nonperforming assets from discontinued operations — education lending (c)		$	25		$	20
	Restructured loans included in nonperforming loans (a)		$	214		$	249
	Restructured loans with an allocated specific allowance (d)			71			114
	Specifically allocated allowance for restructured loans (e)			35			33
	Accruing loans past due 90 days or more		$	71		$	78
	Accruing loans past due 30 through 89 days			318			424
	(a)	December 31, 2012, loan balance includes $72 million of current, paying as originally agreed, secured loans that were discharged through Chapter 7 bankruptcy and not formally re-affirmed, as addressed in updated regulatory guidance issued in the third quarter of 2012. Such loans have been designated as nonperforming and TDRs.
	(b)	December 31, 2013, and December 31, 2012, loan balances exclude $16 million and $23 million of PCI loans, respectively.
	(c)	Includes restructured loans of approximately $13 million and $3 million at December 31, 2013, and December 31, 2012, respectively. See Note 13 (“Acquisitions and Discontinued Operations”) for further discussion.
	(d)	Included in individually impaired loans allocated a specific allowance.
	(e)	Included in allowance for individually evaluated impaired loans.
Impaired Loans Evaluated for Specific Reserves	'
	The following tables set forth a further breakdown of individually impaired loans as of December 31, 2013, and December 31, 2012:
	December 31, 2013		Recorded			(a)		Unpaid				(b)	Specific			Average
	in millions		Investment					Principal					Allowance			Recorded
								Balance								Investment
	With no related allowance recorded:
	Commercial, financial and agricultural		$	33				$	69					—		$	33
	Commercial real estate:
	Commercial mortgage			21					25					—			55
	Construction			48					131					—			48
	Total commercial real estate loans			69					156					—			103
	Total commercial loans with no related allowance recorded			102					225					—			136
	Real estate — residential mortgage			27					27					—			24
	Home equity:
	Key Community Bank			67					67					—			66
	Other			2					2					—			2
	Total home equity loans			69					69					—			68
	Consumer other:
	Marine			3					3					—			2
	Total consumer other			3					3					—			2
	Total consumer loans			99					99					—			94
	Total loans with no related allowance recorded			201					324					—			230
	With an allowance recorded:
	Commercial, financial and agricultural			17					20				$	8			25
	Commercial real estate:
	Commercial mortgage			6					6					2			7
	Construction			2					12					—			1
	Total commercial real estate loans			8					18					2			8
	Total commercial loans with an allowance recorded			25					38					10			33
	Real estate — residential mortgage			29					29					9			23
	Home equity:
	Key Community Bank			35					35					10			29
	Other			10					11					1			9
	Total home equity loans			45					46					11			38
	Consumer other — Key Community Bank			3					3					1			2
	Credit cards			5					5					1			3
	Consumer other:
	Marine			49					49					10			55
	Other			1					1					—			1
	Total consumer other			50					50					10			56
	Total consumer loans			132					133					32			122
	Total loans with an allowance recorded			157					171					42			155
	Total		$	358				$	495				$	42		$	385
	(a)	The Recorded Investment represents the face amount of the loan increased or decreased by applicable accrued interest, net deferred loan fees and costs, and unamortized premium or discount, and reflects direct charge-offs. This amount is a component of total loans on our consolidated balance sheet.
	(b)	The Unpaid Principal Balance represents the customer’s legal obligation to us.
	December 31, 2012		Recorded			(a)		Unpaid				(b)	Specific			Average
	in millions		Investment					Principal					Allowance			Recorded
								Balance								Investment
	With no related allowance recorded:
	Commercial, financial and agricultural		$	32				$	64					—		$	60
	Commercial real estate:
	Commercial mortgage			89					142					—			95
	Construction			48					182					—			39
	Total commercial real estate loans			137					324					—			134
	Total commercial loans with no related allowance recorded			169					388					—			194
	Real estate — residential mortgage			21					21					—			10
	Home equity:
	Key Community Bank			65					65					—			33
	Other			3					3					—			1
	Total home equity loans			68					68					—			34
	Total consumer loans			89					89					—			44
	Total loans with no related allowance recorded			258					477					—			238
	With an allowance recorded:
	Commercial, financial and agricultural			33					42				$	12			48
Commercial real estate:
Commercial mortgage			7					7					1			51
Construction			—					—					—			6
Total commercial real estate loans			7					7					1			57
Total commercial loans with an allowance recorded			40					49					13			105
Real estate — residential mortgage			17					17					1			8
Home equity:
Key Community Bank			22					22					11			11
Other			9					9					1			5
Total home equity loans			31					31					12			16
Consumer other — Key Community Bank			2					2					2			1
Credit cards			2					2					—			1
Consumer other:
Marine			60					60					7			30
Other			1					1					—			1
Total consumer other			61					61					7			31
Total consumer loans			113					113					22			57
Total loans with an allowance recorded			153					162					35			162
Total		$	411				$	639				$	35		$	400
(a)	The Recorded Investment represents the face amount of the loan increased or decreased by applicable accrued interest, net deferred loan fees and costs, and unamortized premium or discount, and reflects direct charge-offs. This amount is a component of total loans on our consolidated balance sheet.
(b)	The Unpaid Principal Balance represents the customer’s legal obligation to us.
Breakdown of Nonperforming TDRs by Loans Category	'
	A further breakdown of TDRs included in nonperforming loans by loan category as of December 31, 2013, follows:
	December 31, 2013		Number			Pre-modification				Post-modification
	dollars in millions		of loans			Outstanding				Outstanding
						Recorded				Recorded
						Investment				Investment
	LOAN TYPE
	Nonperforming:
	Commercial, financial and agricultural			33		$	72			$	34
	Commercial real estate:
	Real estate — commercial mortgage			11			41				14
	Real estate — construction			6			19				4
	Total commercial real estate loans			17			60				18
	Total commercial loans			50			132				52
	Real estate — residential mortgage			676			43				43
	Home equity:
	Key Community Bank			1,708			91				86
	Other			227			6				6
	Total home equity loans			1,935			97				92
	Consumer other — Key Community Bank			49			2				1
	Credit cards			629			5				4
	Consumer other:
	Marine			360			24				21
	Other			50			1				1
	Total consumer other			410			25				22
	Total consumer loans			3,699			172				162
	Total nonperforming TDRs			3,749			304				214
	Prior-year accruing (a)
	Commercial, financial and agricultural			50			7				3
	Commercial real estate:
	Real estate — commercial mortgage			4			18				10
	Real estate — construction			1			23				42
	Total commercial real estate loans			5			41				52
	Total commercial loans			55			48				55
	Real estate — residential mortgage			119			12				12
	Home equity:
	Key Community Bank			161			17				17
	Other			212			7				6
	Total home equity loans			373			24				23
	Consumer other — Key Community Bank			31			1				1
	Credit cards			240			2				1
	Consumer other:
	Marine			272			51				31
	Other			54			1				1
	Total consumer other			326			52				32
	Total consumer loans			1,089			91				69
	Total prior-year accruing TDRs			1,144			139				124
	Total TDRs			4,893		$	443			$	338
	(a)	All TDRs that were restructured prior to January 1, 2013, and are fully accruing.
	A further breakdown of TDRs included in nonperforming loans by loan category as of December 31, 2012, follows:
	December 31, 2012		Number			Pre-modification				Post-modification
	dollars in millions		of loans			Outstanding				Outstanding
						Recorded				Recorded
						Investment				Investment
	LOAN TYPE
	Nonperforming:
	Commercial, financial and agricultural			82		$	76			$	39
	Commercial real estate:
	Real estate — commercial mortgage			15			62				25
	Real estate — construction			8			53				33
	Total commercial real estate loans			23			115				58
	Total commercial loans			105			191				97
	Real estate — residential mortgage			372			28				28
	Home equity:
Key Community Bank			1,577			87				82
Other			322			9				8
Total home equity loans			1,899			96				90
Consumer other — Key Community Bank			28			1				1
Credit cards			405			3				3
Consumer other:
Marine			251			30				29
Other			34			1				1
Total consumer other			285			31				30
Total consumer loans			2,989			159				152
Total nonperforming TDRs			3,094			350				249
Prior-year accruing (a)
Commercial, financial and agricultural			122			12				6
Commercial real estate:
Real estate — commercial mortgage			4			22				15
Total commercial real estate loans			4			22				15
Total commercial loans			126			34				21
Real estate — residential mortgage			101			10				10
Home equity:
Key Community Bank			76			5				5
Other			84			3				3
Total home equity loans			160			8				8
Consumer other — Key Community Bank			16			—				—
Consumer other:
Marine			117			31				31
Other			43			1				1
Total consumer other			160			32				32
Total consumer loans			437			50				50
Total prior-year accruing TDRs			563			84				71
Total TDRs			3,657		$	434			$	320
(a)	All TDRs that were restructured prior to January 1, 2012, and are fully accruing.
Concession Types for Our Commercial Accruing and Nonaccruing TDRs	'
	The following table shows the concession types for our commercial and consumer accruing and nonaccruing TDRs and other selected financial data.
	December 31,		2013			2012
	in millions
	Commercial loans:
	Interest rate reduction		$	95		$	104
	Forgiveness of principal			5			7
	Other modification of loan terms			7			7
	Total		$	107		$	118
	Consumer loans:
	Interest rate reduction		$	130		$	122
	Forgiveness of principal			5			6
	Other modification of loan terms			96			74
	Total		$	231		$	202
	Total commercial and consumer TDRs (a)		$	338		$	320
	Total loans			54,457			52,822
	(a)	Commitments outstanding to lend additional funds to borrowers whose loan terms have been modified in TDRs are $15 million and $32 million at December 31, 2013, and December 31, 2012, respectively.
Past Due Loans Including Current Loans	'
	The following aging analysis as of December 31, 2013, and December 31, 2012, of past due and current loans provides further information regarding Key’s credit exposure.
	December 31, 2013		Current			30-59				60-89			90 and Greater			Nonperforming		Total Past Due			Purchased		Total
	in millions					Days Past				Days Past			Days Past			Loans		and			Credit		Loans
						Due				Due			Due					Nonperforming			Impaired
																		Loans
	LOAN TYPE
	Commercial, financial and agricultural		$	24,823		$	39			$	8		$	16		$	77	$	140			—	$	24,963
	Commercial real estate:
	Commercial mortgage			7,638			20				7			17			37		81		$	1		7,720
	Construction			1,068			10				—			1			14		25			—		1,093
	Total commercial real estate loans			8,706			30				7			18			51		106			1		8,813
	Commercial lease financing			4,463			32				33			4			19		88			—		4,551
	Total commercial loans		$	37,992		$	101			$	48		$	38		$	147	$	334		$	1	$	38,327
	Real estate — residential mortgage		$	2,038		$	19			$	5		$	4		$	107	$	135		$	14	$	2,187
	Home equity:
	Key Community Bank			10,038			51				31			14			205		301			1		10,340
	Other			308			6				4			1			15		26			—		334
	Total home equity loans			10,346			57				35			15			220		327			1		10,674
	Consumer other — Key Community Bank			1,426			8				5			7			3		23			—		1,449
	Credit cards			698			11				5			4			4		24			—		722
	Consumer other:
	Marine			979			15				6			2			26		49			—		1,028
	Other			65			2				1			1			1		5			—		70
	Total consumer other			1,044			17				7			3			27		54			—		1,098
	Total consumer loans		$	15,552		$	112			$	57		$	33		$	361	$	563		$	15	$	16,130
	Total loans		$	53,544		$	213			$	105		$	71		$	508	$	897		$	16	$	54,457
	December 31, 2012		Current			30-59				60-89			90 and Greater			Nonperforming		Total Past Due			Purchased		Total
	in millions					Days Past				Days Past			Days Past			Loans (a)		and			Credit		Loans
						Due				Due			Due					Nonperforming			Impaired
																		Loans
	LOAN TYPE
	Commercial, financial and agricultural		$	23,030		$	56			$	34		$	22		$	99	$	211		$	1	$	23,242
	Commercial real estate:
	Commercial mortgage			7,556			21				11			9			120		161			3		7,720
	Construction			943			1				2			1			56		60			—		1,003
	Total commercial real estate loans			8,499			22				13			10			176		221			3		8,723
	Commercial lease financing			4,772			88				31			8			16		143			—		4,915
	Total commercial loans		$	36,301		$	166			$	78		$	40		$	291	$	575		$	4	$	36,880
	Real estate — residential mortgage		$	2,023		$	16			$	10		$	6		$	103	$	135		$	16	$	2,174
	Home equity:
	Key Community Bank			9,506			54				26			17			210		307			3		9,816
	Other			387			9				4			2			21		36			—		423
	Total home equity loans			9,893			63				30			19			231		343			3		10,239
	Consumer other — Key Community Bank			1,325			9				5			8			2		24			—		1,349
	Credit cards			706			7				5			—			11		23			—		729
	Consumer other:
	Marine			1,288			23				9			4			34		70			—		1,358
	Other			87			2				1			1			2		6			—		93
	Total consumer other			1,375			25				10			5			36		76			—		1,451
	Total consumer loans		$	15,322		$	120			$	60		$	38		$	383	$	601		$	19	$	15,942
	Total loans		$	51,623		$	286			$	138		$	78		$	674	$	1,176		$	23	$	52,822
	(a)	Includes $72 million of performing secured loans that were discharged through Chapter 7 bankruptcy and not formally re-affirmed, as addressed in updated regulatory guidance issued in the third quarter of 2012. Such loans have been designated as nonperforming and TDRs.
Financing Receivable Credit Quality Indicators	'
	Credit quality indicators for our commercial and consumer loan portfolios, excluding $16 million and $23 million of PCI loans at December 31, 2013, and 2012, respectively, based on bond rating, regulatory classification and payment activity as of December 31, 2013, and 2012, are as follows:
	Commercial Credit Exposure
	Credit Risk Profile by Creditworthiness Category (a)
	December 31,
	in millions
			Commercial, financial and							RE — Commercial						RE — Construction					Commercial Lease				Total
			agricultural
	RATING (b), (c)			2013			2012				2013			2012			2013		2012			2013		2012		2013		2012
	AAA — AA		$	402		$	200			$	2		$	1		$	1	$	1		$	656	$	554	$	1,061	$	756
	A			882			607				56			77			1		1			631		978		1,570		1,663
	BBB — BB			22,368			20,834				7,129			6,549			920		783			3,080		3,118		33,497		31,284
	B			521			787				282			456			32		20			117		175		952		1,438
	CCC — C			790			813				250			634			139		198			67		90		1,246		1,735
	Total		$	24,963		$	23,241			$	7,719		$	7,717		$	1,093	$	1,003		$	4,551	$	4,915	$	38,326	$	36,876
	(a)	Credit quality indicators are updated on an ongoing basis and reflect credit quality information as of the dates indicated.
	(b)	Our bond rating to internal loan grade conversion system is as follows: AAA - AA =, A =, BBB - BB = - 13, B =4 - 16, and CCC - C =7 - 20.
	(c)	Our internal loan grade to regulatory-defined classification is as follows: Pass =-16, Special Mention =7, Substandard =8, Doubtful =9, and Loss =0.
	Consumer Credit Exposure
	Credit Risk Profile by Regulatory Classifications (a), (b)
	December 31,
	in millions
			Residential — Prime
	GRADE			2013			2012
	Pass		$	12,500		$	12,035
	Substandard			346			359
	Total		$	12,846		$	12,394
	Credit Risk Profile Based on Payment Activity (a), (b)
	December 31,		Consumer — Key							Credit cards						Consumer — Marine					Consumer — Other				Total
			Community Bank
	in millions			2013			2012				2013			2012			2013		2012			2013		2012		2013		2012
	Performing		$	1,446		$	1,347			$	718		$	718		$	1,002	$	1,324		$	69	$	91	$	3,235	$	3,480
	Nonperforming			3			2				4			11			26		34			1		2		34		49
	Total		$	1,449		$	1,349			$	722		$	729		$	1,028	$	1,358		$	70	$	93	$	3,269	$	3,529
	(a)	Credit quality indicators are updated on an ongoing basis and reflect credit quality information as of the dates indicated.
	(b)	Our past due payment activity to regulatory classification conversion is as follows: pass =ess than 90 days; and substandard =0 days and greater plus nonperforming loans.
Summary of Allowance for Loan and Lease Losses	'
	A summary of the ALLL at the end of the past three years is presented in the table below:
	in millions		2013			2012				2011
	Balance at beginning of period — continuing operations		$	888		$	1,004			$	1,604
	Charge-offs			(308	)		(508	)			(715	)
	Recoveries			140			163				174
	Net loans and leases charged off			(168	)		(345	)			(541	)
	Provision for loan and lease losses from continuing operations			130			229				(60	)
	Foreign currency translation adjustment			(2	)		—				1
	Balance at end of period — continuing operations		$	848		$	888			$	1,004
Changes in Allowance for Loan and Lease Losses by Loan Category	'
	The changes in the ALLL by loan category for the periods indicated are as follows:
			December 31,													December 31,
	in millions		2012			Provision				Charge-offs			Recoveries			2013
	Commercial, financial and agricultural		$	327		$	58			$	(62	)	$	39		$	362
	Real estate — commercial mortgage			198			(40	)			(20	)		27			165
	Real estate — construction			41			(20	)			(3	)		14			32
	Commercial lease financing			55			19				(27	)		15			62
	Total commercial loans			621			17				(112	)		95			621
	Real estate — residential mortgage			30			25				(20	)		2			37
	Home equity:
	Key Community Bank			105			31				(62	)		10			84
	Other			25			—				(20	)		6			11
	Total home equity loans			130			31				(82	)		16			95
	Consumer other — Key Community Bank			38			15				(31	)		7			29
	Credit cards			26			35				(30	)		3			34
	Consumer other:
	Marine			39			4				(29	)		15			29
	Other			4			1				(4	)		2			3
	Total consumer other:			43			5				(33	)		17			32
	Total consumer loans			267			111				(196	)		45			227
	Total ALLL — continuing operations			888			128	(a)			(308	)		140			848
	Discontinued operations			55			21				(55	)		18			39
	Total ALLL — including discontinued operations		$	943		$	149				$        (363	)	$	158		$	887
	(a)	Includes $2 million of foreign currency translation adjustment.
			December 31,													December 31,
	in millions		2011			Provision				Charge-offs			Recoveries			2012
	Commercial, financial and agricultural		$	334		$	10			$	(80	)	$	63		$	327
	Real estate — commercial mortgage			272			5				(102	)		23			198
	Real estate — construction			63			(3	)			(24	)		5			41
	Commercial lease financing			78			(18	)			(27	)		22			55
	Total commercial loans			747			(6	)			(233	)		113			621
	Real estate — residential mortgage			37			17				(27	)		3			30
	Home equity:
	Key Community Bank			103			90				(99	)		11			105
	Other			29			26				(35	)		5			25
	Total home equity loans			132			116				(134	)		16			130
	Consumer other — Key Community Bank			41			29				(38	)		6			38
	Credit cards			—			37				(11	)		—			26
	Consumer other:
	Marine			46			30				(59	)		22			39
	Other			1			6				(6	)		3			4
	Total consumer other:			47			36				(65	)		25			43
	Total consumer loans			257			235				(275	)		50			267
	Total ALLL — continuing operations			1,004			229				(508	)		163			888
	Discontinued operations			104			9				(75	)		17			55
	Total ALLL — including discontinued operations		$	1,108		$	238				$        (583	)	$	180		$	943
			December 31,													December 31,
	in millions		2010			Provision				Charge-offs			Recoveries			2011
	Commercial, financial and agricultural		$	485		$	(32	)		$	(169	)	$	50		$	334
	Real estate — commercial mortgage			416			(41	)			(113	)		10			272
	Real estate — construction			145			(26	)			(83	)		27			63
	Commercial lease financing			175			(80	)			(42	)		25			78
	Total commercial loans			1,221			(179	)			(407	)		112			747
	Real estate — residential mortgage			49			14				(29	)		3			37
	Home equity:
	Key Community Bank			120			72				(100	)		11			103
	Other			57			13				(45	)		4			29
	Total home equity loans			177			85				(145	)		15			132
	Consumer other — Key Community Bank			57			21				(45	)		8			41
	Consumer other:
	Marine			89			5				(80	)		32			46
	Other			11			(5	)			(9	)		4			1
	Total consumer other:			100			—				(89	)		36			47
Total consumer loans			383			120				(308	)		62			257
Total ALLL — continuing operations			1,604			(59	)(a)			(715	)		174			1,004
Discontinued operations			114			113				(138	)		15			104
Total ALLL — including discontinued operations		$	1,718		$	54			$	(853	)	$	189		$	1,108
(a)	Includes $1 million of foreign currency translation adjustment.
Allowance for Loan and Lease Losses and Corresponding Loan Balances	'
	A breakdown of the individual and collective ALLL and the corresponding loan balances as of December 31, 2013, follows:
			Allowance										Outstanding
	December 31, 2013		Individually			Collectively				Purchased			Loans			Individually		Collectively			Purchased
	in millions		Evaluated for			Evaluated for				Credit						Evaluated for		Evaluated for			Credit
			Impairment			Impairment				Impaired						Impairment		Impairment			Impaired
	Commercial, financial and agricultural		$	8		$	354				—		$	24,963		$	50	$	24,913			—
	Commercial real estate:
	Commercial mortgage			2			163				—			7,720			27		7,692		$	1
	Construction			—			32				—			1,093			50		1,043			—
	Total commercial real estate loans			2			195				—			8,813			77		8,735			1
	Commercial lease financing			—			62				—			4,551			—		4,551			—
	Total commercial loans			10			611				—			38,327			127		38,199			1
	Real estate — residential mortgage			9			27			$	1			2,187			56		2,117			14
	Home equity:
	Key Community Bank			10			74				—			10,340			102		10,237			1
	Other			1			10				—			334			12		322			—
	Total home equity loans			11			84				—			10,674			114		10,559			1
	Consumer other — Key Community Bank			1			28				—			1,449			3		1,446			—
	Credit cards			1			33				—			722			5		717			—
	Consumer other:
	Marine			10			19				—			1,028			52		976			—
	Other			—			3				—			70			1		69			—
	Total consumer other			10			22				—			1,098			53		1,045			—
	Total consumer loans			32			194				1			16,130			231		15,884			15
	Total ALLL — continuing operations			42			805				1			54,457			358		54,083			16
	Discontinued operations			1			38				—			4,497	(a)		13		4,484	(a)		—
	Total ALLL — including discontinued operations		$	43		$	843			$	1		$	58,954		$	371	$	58,567		$	16
	(a)	Amount includes $2.1 billion of loans carried at fair value that are excluded from ALLL consideration.
	A breakdown of the individual and collective ALLL and the corresponding loan balances as of December 31, 2012, follows:
			Allowance										Outstanding
	December 31, 2012		Individually			Collectively				Purchased			Loans			Individually		Collectively			Purchased
	in millions		Evaluated for			Evaluated for				Credit						Evaluated for		Evaluated for			Credit
			Impairment			Impairment				Impaired						Impairment		Impairment			Impaired
	Commercial, financial and agricultural		$	12		$	314				—		$	23,242		$	65	$	23,176		$	1
	Commercial real estate:
	Commercial mortgage			1			198				—			7,720			96		7,621			3
	Construction			—			41				—			1,003			48		955			—
	Total commercial real estate loans			1			239				—			8,723			144		8,576			3
	Commercial lease financing			—			55				—			4,915			—		4,915			—
	Total commercial loans			13			608				—			36,880			209		36,667			4
	Real estate — residential mortgage			1			29			$	1			2,174			38		2,120			16
	Home equity:
	Key Community Bank			11			94				—			9,816			87		9,726			3
	Other			1			24				—			423			12		411			—
	Total home equity loans			12			118				—			10,239			99		10,137			3
	Consumer other — Key Community Bank			2			36				—			1,349			2		1,347			—
	Credit cards			—			26							729			2		727			—
	Consumer other:
	Marine			7			32				—			1,358			60		1,298			—
	Other			—			3				—			93			1		92			—
	Total consumer other			7			35				—			1,451			61		1,390			—
	Total consumer loans			22			244				1			15,942			202		15,721			19
	Total ALLL — continuing operations			35			852				1			52,822			411		52,388			23
	Discontinued operations			—			55				—			5,201	(a)		3		5,198	(a)		—
	Total ALLL — including discontinued operations		$	35		$	907			$	1		$	58,023		$	414	$	57,586		$	23
	(a)	Amount includes $2.5 billion of loans carried at fair value that are excluded from ALLL consideration.
Changes in Liability for Credit Losses on Lending Related Commitments	'
	Changes in the liability for credit losses on unfunded lending-related commitments are summarized as follows:
	in millions		2013			2012				2011
	Balance at beginning of period		$	29		$	45			$	73
	Provision (credit) for losses on lending-related commitments			8			(16	)			(28	)
	Balance at end of period		$	37		$	29			$	45

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2013
Fair Value Disclosures [Abstract]	'
Fair Values of Funds and Unfunded Commitments for Funds	'
	The following table presents the fair value of our indirect investments and related unfunded commitments at December 31, 2013:
	December 31, 2013		Fair Value			Unfunded
	in millions					Commitments
	INVESTMENT TYPE
	Passive funds (a)		$	11		$	1
	Co-managed funds (b)			12			—
	Total		$	23		$	1
	(a)	We invest in passive funds, which are multi-investor private equity funds. These investments can never be redeemed. Instead, distributions are received through the liquidation of the underlying investments in the funds. Some funds have no restrictions on sale, while others require investors to remain in the fund until maturity. The funds will be liquidated over a period of one to five years.
	(b)	We are a manager or co-manager of these funds. These investments can never be redeemed. Instead, distributions are received through the liquidation of the underlying investments in the funds. In addition, we receive management fees. We can sell or transfer our interest in any of these funds with the written consent of a majority of the fund’s investors. In one instance, the other co-manager of the fund must consent to the sale or transfer of our interest in the fund. The funds will mature over a period of one to four years.
Fair Value of Assets and Liabilities Measured on Recurring Basis	'
	Certain assets and liabilities are measured at fair value on a recurring basis in accordance with GAAP. The following tables present these assets and liabilities at December 31, 2013, and December 31, 2012.
	December 31, 2013		Level 1			Level 2			Level 3			Total
	in millions
	ASSETS MEASURED ON A RECURRING BASIS
	Short-term investments:
	Securities purchased under resale agreements			—		$	347			—		$	347
	Trading account assets:
	U.S. Treasury, agencies and corporations			—			471			—			471
	States and political subdivisions			—			23			—			23
	Collateralized mortgage obligations			—			9			—			9
	Other mortgage-backed securities			—			120			—			120
	Other securities		$	4			108			—			112
	Total trading account securities			4			731			—			735
	Commercial loans			—			3			—			3
	Total trading account assets			4			734			—			738
	Securities available for sale:
	States and political subdivisions			—			40			—			40
	Collateralized mortgage obligations			—			11,000			—			11,000
	Other mortgage-backed securities			—			1,286			—			1,286
	Other securities			20			—			—			20
	Total securities available for sale			20			12,326			—			12,346
	Other investments:
	Principal investments:
	Direct			—			—		$	141			141
	Indirect			—			—			413			413
	Total principal investments			—			—			554			554
	Equity and mezzanine investments:
	Direct			—			—			—			—
	Indirect			—			—			23			23
	Total equity and mezzanine investments			—			—			23			23
	Total other investments			—			—			577			577
	Derivative assets:
	Interest rate			—			1,014			25			1,039
	Foreign exchange			56			7			—			63
	Commodity			—			112			—			112
	Credit			—			1			4			5
	Equity			—			—			—			—
	Derivative assets			56			1,134			29			1,219
	Netting adjustments (a)			—			—			—			(812	)
	Total derivative assets			56			1,134			29			407
	Accrued income and other assets			1			55			—			56
	Total assets on a recurring basis at fair value		$	81		$	14,596		$	606		$	14,471
	LIABILITIES MEASURED ON A RECURRING BASIS
	Federal funds purchased and securities sold under repurchase agreements:
	Securities sold under repurchase agreements			—		$	517			—		$	517
	Bank notes and other short-term borrowings:
	Short positions		$	2			341			—			343
	Derivative liabilities:
	Interest rate			—			739			—			739
	Foreign exchange			49			8			—			57
	Commodity			—			106			—			106
	Credit			—			11		$	1			12
	Equity			—			—			—			—
	Derivative liabilities			49			864			1			914
	Netting adjustments (a)			—			—			—			(500	)
	Total derivative liabilities			49			864			1			414
	Accrued expense and other liabilities			—			1			—			1
	Total liabilities on a recurring basis at fair value		$	51		$	1,723		$	1		$	1,275
	(a)	Netting adjustments represent the amounts recorded to convert our derivative assets and liabilities from a gross basis to a net basis in accordance with 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.
	December 31, 2012		Level 1			Level 2			Level 3			Total
	in millions
	ASSETS MEASURED ON A RECURRING BASIS
	Short term investments:
Securities purchased under resale agreements			—		$	271			—		$	271
Trading account assets:
U.S. Treasury, agencies and corporations			—			383			—			383
States and political subdivisions			—			21		$	3			24
Collateralized mortgage obligations			—			8			—			8
Other mortgage-backed securities			—			4			—			4
Other securities		$	2			175			—			177
Total trading account securities			2			591			3			596
Commercial loans			—			9			—			9
Total trading account assets			2			600			3			605
Securities available for sale:
States and political subdivisions			—			49			—			49
Collateralized mortgage obligations			—			11,464			—			11,464
Other mortgage-backed securities			—			538			—			538
Other securities			43			—			—			43
Total securities available for sale			43			12,051			—			12,094
Other investments:
Principal investments:
Direct			—			—			191			191
Indirect			—			—			436			436
Total principal investments			—			—			627			627
Equity and mezzanine investments:
Direct			—			—			—			—
Indirect			—			—			41			41
Total equity and mezzanine investments			—			—			41			41
Total other investments			—			—			668			668
Derivative assets:
Interest rate			—			1,705			19			1,724
Foreign exchange			54			21			—			75
Commodity			—			154			2			156
Credit			—			3			5			8
Equity			—			—			—			—
Derivative assets			54			1,883			26			1,963
Netting adjustments (a)			—			—			—			(1,270	)
Total derivative assets			54			1,883			26			693
Accrued income and other assets			—			3			—			3
Total assets on a recurring basis at fair value		$	99		$	14,808		$	697		$	14,334
LIABILITIES MEASURED ON A RECURRING BASIS
Federal funds purchased and securities sold under repurchase agreements:
Securities sold under repurchase agreements			—		$	228			—		$	228
Bank notes and other short-term borrowings:
Short positions			—			287			—			287
Derivative liabilities:
Interest rate			—			1,152			—			1,152
Foreign exchange		$	55			20			—			75
Commodity			—			149		$	1			150
Credit			—			9			1			10
Equity			—			—			—			—
Derivative liabilities			55			1,330			2			1,387
Netting adjustments (a)			—			—			—			(803	)
Total derivative liabilities			55			1,330			2			584
Accrued expense and other liabilities			—			49			—			49
Total liabilities on a recurring basis at fair value		$	55		$	1,894		$	2		$	1,148
(a)	Netting adjustments represent the amounts recorded to convert our derivative assets and liabilities from a gross basis to a net basis in accordance with 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.
Change in Fair Values of Level 3 Financial Instruments	'
	Changes in Level 3 Fair Value Measurements
	The following table shows the change in the fair values of our Level 3 financial instruments for the years ended December 31, 2013, and 2012. We mitigate the credit risk, interest rate risk, and risk of loss related to many of these Level 3 instruments by using securities and derivative positions classified as Level 1 or Level 2. Level 1 and Level 2 instruments are not included in the following table. Therefore, the gains or losses shown do not include the impact of our risk management activities.
	in millions		Beginning			Gains						Purchases			Sales			Settlements			Transfers		(e)			Transfers			(e)				End of			(g)		Unrealized
			of Period			(Losses)															into					out of							Period					Gains
			Balance			Included in															Level 3					Level 3							Balance					(Losses)
						Earnings																																Included in
																																						Earnings
	Year ended December 31, 2013
	Trading account assets
	Other mortgage-backed securities			—		$	4			(b	)		—		$	-4			—			—					—							—					—
	Other securities			—			4			(b	)		—			—		$	(4	)		—					—							—				$	(1	)			(b	)
	State and political subdivisions		$	3			—						—			(3	)		—			—					—							—					—
	Other investments
	Principal investments
	Direct			191			(11	)		(c	)	$	8			(47	)		—			—					—						$	141					(23	)			(c	)
	Indirect			436			58			(c	)		23			(104	)		—			—					—							413					18				(c	)
	Equity and mezzanine investments
	Direct			—			—						—			—			—			—					—							—					8				(c	)
	Indirect			41			2			(c	)		—			—			(20	)		—					—							23					2				(c	)
	Derivative instruments (a)
	Interest rate			19			(10	)		(d	)		1			(2	)		—		$	46		(f	)	$	(29	)		(f	)			25					—
	Commodity			1			(1	)		(d	)		—			—			—			—					—							—					—
	Credit			4			(8	)		(d	)		—			—			7			—					—							3					—
	in millions		Beginning			Gains						Purchases			Sales			Settlements			Transfers		(e)			Transfers			(e)		End of				(g)	Unrealized
			of Period			(Losses)															into					out of					Period					Gains
			Balance			Included in															Level 3					Level 3					Balance					(Losses)
						Earnings																														Included in
																																				Earnings
	Year ended December 31, 2012
	Trading account assets
	Other mortgage-backed securities		$	35		$	1			(b	)		—		$	(32	)		—			—				$	(4	)				—					—
	State and political subdivisions			—			3			(b	)		—			(7	)	$	(50	)	$	57		(h	)		—				$	3				$	4				(b	)
	Other investments
	Principal investments
	Direct			225			11			(c	)	$	12			(57	)		—			—					—					191					14				(c	)
	Indirect			473			52			(c	)		34			(123	)		—			—					—					436					5				(c	)
	Equity and mezzanine investments
	Direct			15			2			(c	)		—			—			(17	)		—					—					—					10				(c	)
	Indirect			36			8			(c	)		4			—			(7	)		—					—					41					8				(c	)
	Derivative instruments (a)
	Interest rate			38			(5	)		(d	)		2			(7	)		—			8					(17	)				19					—
	Commodity			(1	)		1			(d	)		(1	)		—			—			2					—					1					—
	Credit			(21	)		(13	)		(d	)		—			—			38			—					—					4					—
	(a)	Amounts represent Level 3 derivative assets less Level 3 derivative liabilities.
	(b)	Realized and unrealized gains and losses on trading account assets are reported in “other income” on the income statement.
	(c)	Realized and unrealized gains and losses on principal investments and private equity and mezzanine investments are reported in “net gains (losses) from principal investing” on the income statement.
	(d)	Realized and unrealized gains and losses on derivative instruments are reported in “corporate services income” and “other income” on the income statement.
	(e)	Our policy is to recognize transfers into and transfers out of Level 3 as of the end of the reporting period.
	(f)	Certain derivatives 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.
	(g)	There were no issuances for the years ended December 31, 2013, and 2012.
	(h)	These securities were transferred because of decreased observable market activity for these securities.
Assets Measured at Fair Value on Nonrecurring Basis	'
	Assets 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. The following table presents our assets measured at fair value on a nonrecurring basis at December 31, 2013, and 2012:
			December 31, 2013												December 31, 2012
	in millions		Level 1			Level 2			Level 3			Total			Level 1			Level 2			Level 3		Total
	ASSETS MEASURED ON A NONRECURRING BASIS
	Impaired loans			—			—		$	16		$	16			—			—		$	25	$	25
	Loans held for sale (a)			—			—			—			—			—			—			9		9
	Accrued income and other assets			—			—			14			14			—		$	2			20		22
	Total assets on a nonrecurring basis at fair value			—			—		$	30		$	30			—		$	2		$	54	$	56
	(a)	During 2013, we transferred $9 million of commercial and consumer loans and leases at their current fair value from held-for-sale status to the held-to-maturity portfolio, compared to $17 million during 2012.
Quantitative Information about Level 3 Fair Value Measurements	'
	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 December 31, 2013, and December 31, 2012, along with the valuation techniques used, are shown in the following table:
	December 31, 2013		Fair Value of			Valuation Technique		Significant	Range
	dollars in millions		Level 3 Assets					Unobservable Input	(Weighted-Average)
	Recurring
	Other investments —  principal investments —   direct:		$	141		Individual analysis of the condition of each investment
	Debt instruments							EBITDA multiple		6.00 - 7.00 (6.10)
	Equity instruments of private companies							EBITDA multiple (where applicable)		4.80 - 10.40 (6.20)
								Revenue multiple (where applicable)		1.10 - 4.70 (4.00)
	Nonrecurring
	Impaired loans			16		Fair value of underlying collateral		Discount		10.00 - 100.00% (36.00%)
	Goodwill			979		Discounted cash flow and market data		Earnings multiple of peers		10.10 - 14.40 (11.59)
								Equity multiple of peers		1.17 - 1.29 (1.24)
								Control premium		N/A (35.00%)
								Weighted-average cost of capital		N/A (13.00%)
	December 31, 2012		Fair Value of			Valuation Technique		Significant	Range
	dollars in millions		Level 3 Assets					Unobservable Input	(Weighted-Average)
	Recurring
	Other investments —  principal investments —   direct:		$	191		Individual analysis of the condition of each investment
	Debt instruments							EBITDA multiple		5.50 - 6.00 (5.90)
	Equity instruments of private companies							EBITDA multiple (where applicable)		5.00 - 8.50 (6.10)
								Revenue multiple (where applicable)		0.30 - 5.70 (4.80)
	Nonrecurring
	Impaired loans			25		Fair value of underlying collateral		Discount		0.00 - 100.00% (45.00%)
	Goodwill			979		Discounted cash flow and market data		Earnings multiple of peers		9.70 - 14.20 (11.25)
								Equity multiple of peers		.95 - 1.17 (1.09)
								Control premium		N/A (30.00%)
								Weighted-average cost of capital		N/A (13.00%)
Fair Value Disclosures of Financial Instruments	'
	Fair Value Disclosures of Financial Instruments
	The levels in the fair value hierarchy ascribed to our financial instruments and the related carrying amounts at December 31, 2013, and December 31, 2012, are shown in the following table.
			December 31, 2013
						Fair Value
	in millions		Carrying			Level 1			Level 2			Level 3			Netting			Total
			Amount												Adjustment
	ASSETS
	Cash and short-term investments (a)		$	6,207		$	5,860		$	347			—			—		$	6,207
	Trading account assets (b)			738			4			734			—			—			738
	Securities available for sale (b)			12,346			20			12,326			—			—			12,346
	Held-to-maturity securities (c)			4,756			—			4,617			—			—			4,617
	Other investments (b)			969			—			392		$	577			—			969
	Loans, net of allowance (d)			53,609			—			—			52,102			—			52,102
	Loans held for sale (b)			611			—			—			611			—			611
	Mortgage servicing assets (e)			332			—			—			386			—			386
	Derivative assets (b)			407			56			1,134			29		$	(812	) (f)		407
	LIABILITIES
	Deposits with no stated maturity (a)		$	62,425			—		$	62,425			—			—		$	62,425
	Time deposits (e)			6,837		$	558			6,368			—			—			6,926
	Short-term borrowings (a)			1,877			2			1,875			—			—			1,877
	Long-term debt (e)			7,650			7,611			397			—			—			8,008
	Derivative liabilities (b)			414			49			864		$	1		$	(500	) (f)		414
			31-Dec-12
						Fair Value
	in millions		Carrying			Level 1			Level 2			Level 3			Netting			Total
			Amount												Adjustment
	ASSETS
	Cash and short-term investments (a)		$	4,525		$	4,254		$	271			—			—		$	4,525
	Trading account assets (b)			605			2			600		$	3			—			605
	Securities available for sale (b)			12,094			43			12,051			—			—			12,094
	Held-to-maturity securities (c)			3,931			—			3,992			—			—			3,992
	Other investments (b)			1,064			—			396			668			—			1,064
	Loans, net of allowance (d)			51,934			—			—			51,046			—			51,046
	Loans held for sale (b)			599			—			—			599			—			599
	Mortgage servicing assets (e)			204			—			—			238			—			238
	Derivative assets (b)			693			54			1,883			26		$	(1,270	) (f)		693
	LIABILITIES
	Deposits with no stated maturity (a)		$	58,132			—		$	58,132			—			—		$	58,132
	Time deposits (e)			7,861		$	408			7,612			—			—			8,020
	Short-term borrowings (a)			1,896			—			1,896			—			—			1,896
	Long-term debt (e)			6,847			2,807			4,585			—			—			7,392
	Derivative liabilities (b)			584			54			1,331		$	2		$	(803	) (f)		584
	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 Measured at Fair Value on a Nonrecurring Basis” in this note.
	(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 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 mortgage servicing assets, 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 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.

Securities_Tables

Securities (Tables)	12 Months Ended
	Dec. 31, 2013
Investments Debt And Equity Securities [Abstract]	'
Details of Securities	'
	The amortized cost, unrealized gains and losses, and fair value of our securities available for sale and held-to-maturity securities are presented in the following table. 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.
			2013												2012
	December 31,		Amortized		Gross		Gross				Fair				Amortized			Gross		Gross		Fair
	in millions		Cost		Unrealized		Unrealized				Value				Cost			Unrealized		Unrealized		Value
					Gains		Losses											Gains		Losses
	SECURITIES AVAILABLE FOR SALE
	States and political subdivisions		$	39	$	1		—			$	40			$	47		$	2		—	$	49
	Collateralized mortgage obligations			11,120		152	$	272				11,000				11,148			316		—		11,464
	Other mortgage-backed securities			1,270		27		11				1,286				491			47		—		538
	Other securities			17		3		—				20				42			1		—		43
	Total securities available for sale		$	12,446	$	183	$	283			$	12,346			$	11,728		$	366		—	$	12,094
	HELD-TO-MATURITY SECURITIES
	Collateralized mortgage obligations		$	4,736	$	6	$	145			$	4,597			$	3,913		$	61		—	$	3,974
	Other securities			20		—		—				20				18			—		—		18
	Total held-to-maturity securities		$	4,756	$	6	$	145			$	4,617			$	3,931		$	61		—	$	3,992
Available for Sale Securities (Unrealized Loss Position)	'
	The following table summarizes our securities that were in an unrealized loss position as of December 31, 2013, and 2012.
			Duration of Unrealized Loss Position
			Less than 12 Months						12 Months or Longer									Total
	in millions		Fair Value		Gross		(a)		Fair Value				Gross				(a)	Fair Value		Gross		(a)
					Unrealized								Unrealized							Unrealized
					Losses								Losses							Losses
	December 31, 2013
	Securities available for sale:
	Collateralized mortgage obligations		$	5,122	$	261			$	157			$	11				$	5,279	$	272
	Other mortgage-backed securities			856		11				—				—					856		11
	Other securities			2		—				—				—					2		—
	Held-to-maturity:
	Collateralized mortgage obligations			3,969		145				—				—					3,969		145
	Other securities			2		—				—				—					2		—
	Total temporarily impaired securities		$	9,951	$	417			$	157			$	11				$	10,108	$	428
	December 31, 2012
	Securities available for sale:
	Other securities		$	31		—			$	3				—				$	34		—
	Total temporarily impaired securities		$	31		—			$	3				—				$	34		—
	(a)	Gross unrealized losses totaled less than $1 million for the year ended December 31, 2012.
Cumulative Credit Portion of Impairments on Debt Securities	'
	As shown in the following table, we did not have any impairment losses recognized in earnings for the year ended December 31, 2013.
	Year ended December 31, 2013
	in millions
	Balance at December 31, 2012		$	4
	Impairment recognized in earnings			—
	Balance at December 31, 2013		$	4
Available for Sale Securities Realized Gains and Losses	'
	Realized gains and losses related to securities available for sale were as follows:
	Year ended December 31, 2013			2013		2012		2011
	in millions
	Realized gains		$	1		—	$	23
	Realized losses (a)			—		—		22
	Net securities gains (losses)		$	1		—	$	1
	(a)	Realized losses totaled less than $1 million for the year ended December 31, 2013.
Securities by Maturity	'
	Actual maturities may differ from expected or contractual maturities since borrowers have the right to prepay obligations with or without prepayment penalties.
			Securities				Held-to-Maturity
			Available for Sale				Securities
	December 31, 2013		Amortized		Fair		Amortized				Fair
	in millions		Cost		Value		Cost				Value
	Due in one year or less		$	457	$	466	$	7			$	6
	Due after one through five years			11,550		11,462		4,605				4,475
	Due after five through ten years			435		414		144				136
	Due after ten years			4		4		—				—
	Total		$	12,446	$	12,346	$	4,756			$	4,617

Derivatives_and_Hedging_Activi1

Derivatives and Hedging Activities (Tables)	12 Months Ended
	Dec. 31, 2013
Derivative Instruments And Hedging Activities Disclosure [Abstract]	'
Fair Values, Volume of Activity and Gain (Loss) Information Related to Derivative Instruments	'
	Our derivative instruments are included in “derivative assets” or “derivative liabilities” on the balance sheet, as indicated in the following table:
			December 31, 2013											December 31, 2012
							Fair Value											Fair Value
	in millions		Notional				Derivative			Derivative				Notional				Derivative				Derivative
			Amount				Assets			Liabilities				Amount				Assets				Liabilities
	Derivatives designated as hedging instruments:
	Interest rate		$	14,487			$	306		$	37			$	19,085			$	579			$	30
	Foreign exchange			190				4			1				196				—				7
	Total			14,677				310			38				19,281				579				37
	Derivatives not designated as hedging instruments:
	Interest rate			46,173				733			702				51,633				1,144				1,122
	Foreign exchange			4,701				59			56				5,025				75				68
	Commodity			1,616				112			106				1,688				156				150
	Credit			910				5			12				955				9				10
	Equity			—				—			—				7				—				—
	Total			53,400				909			876				59,308				1,384				1,350
	Netting adjustments (a)			—				(812	)		(500	)			—				(1,270	)			(803	)
	Net derivatives in the balance sheet			68,077				407			414				78,589				693				584
	Other collateral (b)			—				(72	)		(287	)			—				(163	)			(475	)
	Net derivative amounts		$	68,077			$	335		$	127			$	78,589			$	530			$	109
	(a)	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.
	(b)	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 table summarizes the pre-tax net gains (losses) on our fair value hedges for the years ended December 31, 2013, and 2012, and where they are recorded on the income statement.
			Year ended December 31, 2013
	in millions		Income Statement Location of		Net Gains				Hedged Item	Income Statement Location of		Net Gains
			Net Gains (Losses) on Derivative		(Losses) on					Net Gains (Losses) on Hedged Item		(Losses) on
					Derivative							Hedged Item
	Interest rate		Other income		$	(222)			Long-term debt	Other income		$	222				(a	)
	Interest rate		Interest expense – Long-term debt			129
	Total				$	-93						$	222
			Year ended December 31, 2012
	in millions		Income Statement Location of		Net Gains				Hedged Item	Income Statement Location of		Net Gains
			Net Gains (Losses) on Derivative		(Losses) on					Net Gains (Losses) on Hedged Item		(Losses) on
					Derivative							Hedged Item
	Interest rate		Other income		$	(52	)		Long-term debt	Other income		$	45				(a	)
	Interest rate		Interest expense – Long-term debt			155
	Foreign exchange		Other income			5			Long-term debt	Other income			(6)				(a	)
	Foreign exchange		Interest expense – Long-term debt			1			Long-term debt	Interest expense – Long-term debt			(1)				(b	)
	Total				$	109						$	38
	(a)	Net gains (losses) on hedged items represent the change in fair value caused by fluctuations in interest rates.
	(b)	Net gains (losses) on hedged items represent the change in fair value caused by fluctuations in foreign currency exchange rates.
Derivative Instrument Cash Flow Hedge Earning Recognized by Income Statement Location	'
	The following table summarizes the pre-tax net gains (losses) on our cash flow and net investment hedges for the years ended December 31, 2013, and 2012, and where they are recorded on the income statement. The table includes the effective portion of net gains (losses) recognized in OCI during the period, the effective portion of net gains (losses) reclassified from OCI into income during the current period, and the portion of net gains (losses) recognized directly in income, representing the amount of hedge ineffectiveness.
			Year ended December 31, 2013
	in millions		Net Gains (Losses)				Income Statement Location of Net Gains			Net Gains				Income Statement Location of				Net Gains
			Recognized in OCI				(Losses) Reclassified From OCI Into			(Losses) Reclassified				Net Gains (Losses) Recognized				(Losses) Recognized
			(Effective Portion)				Income (Effective Portion)			From OCI Into Income				in  Income (Ineffective Portion)				in Income (Ineffective
										(Effective Portion)								Portion)
	Cash Flow Hedges
	Interest rate		$	(19	)			Interest income – Loans		$	67				Other income				—
	Interest rate			20				Interest expense –  Long-term debt			(8	)			Other income				—
	Interest rate			—				Investment banking and debt placement fees			—				Other income				—
	Net Investment Hedges
	Foreign exchange contracts			9				Other Income			(3	)			Other income				—
	Total		$	10						$	56								—
			Year ended December 31, 2012
	in millions		Net Gains (Losses)				Income Statement Location of			Net Gains				Income Statement Location of				Net Gains
			Recognized in OCI				Net Gains (Losses)			(Losses) Reclassified				Net Gains (Losses) Recognized				(Losses) Recognized
			(Effective Portion)				Reclassified From OCI Into Income			From OCI Into Income				in  Income (Ineffective Portion)				in Income (Ineffective
							(Effective Portion)			(Effective Portion)								Portion)
	Cash Flow Hedges
	Interest rate		$	105				Interest income – Loans		$	66				Other income				—
	Interest rate			(6	)			Interest expense – Long-term debt			(10	)			Other income				—
	Interest rate			—				Investment banking and debt placement fees			—				Other income				—
	Net Investment Hedges
	Foreign exchange contracts			(14	)			Other Income			—				Other income				—
	Total		$	85						$	56								—
After-Tax Change in AOCI Resulting from Cash Flow Hedges	'
	The after-tax change in AOCI resulting from cash flow and net investment hedges is as follows:
	in millions		December 31,				2013 Hedging			Reclassification				December 31,
			2012				Activity			of Gains to Net				2013
										Income
	AOCI resulting from cash flow and net investment hedges		$	18			$	6		$		(35)		$	(11	)
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 years ended December 31, 2013, 2012, and 2011, and where they are recorded on the income statement.
			2013											2012												2011
	in millions		Corporate				Other			Total				Corporate				Other				Total				Corporate			Other			Total
			Services				Income							Services				Income								Services			Income
			Income											Income												Income
	NET GAINS (LOSSES)
	Interest rate		$	17				—		$	17			$	24			$	(2	)		$	22			$	19			—		$	19
	Foreign exchange			38				—			38				36				—				36				42			—			42
	Commodity			5				—			5				9				—				9				4			—			4
	Credit			1			$	(15	)		(14	)			—				(20	)			(20	)			(3	)	$	(42	)		(45	)
	Total net gains (losses)		$	61			$	(15	)	$	46			$	69			$	(22	)		$	47			$	62		$	(42	)	$	20
Largest Exposure to Individual Counterparty	'
	The following table summarizes our largest exposure to an individual counterparty at the dates indicated.
	December 31,		2013				2012
	in millions
	Largest gross exposure (derivative asset) to an individual counterparty		$	121			$	182
	Collateral posted by this counterparty			42				66
	Derivative liability with this counterparty			106				191
	Collateral pledged to this counterparty			33				82
	Net exposure after netting adjustments and collateral			6				7
Fair Value of Derivative Assets by Type	'
	The following table summarizes the fair value of our derivative assets by type. 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.
	December 31,		2013				2012
	in millions
	Interest rate		$	633			$	1,114
	Foreign exchange			23				23
	Commodity			58				47
	Credit			1				3
	Derivative assets before collateral			715				1,187
	Less: Related collateral			308				494
	Total derivative assets		$	407			$	693
Fair Value of Credit Derivatives Purchased and Sold	'
	The following table summarizes the fair value of our credit derivatives purchased and sold by type as of December 31, 2013, and 2012. The fair value of credit derivatives presented below does not take into account the effects of bilateral collateral or master netting agreements.
	December 31,		2013											2012
	in millions		Purchased				Sold			Net				Purchased				Sold				Net
	Single-name credit default swaps		$	(7)			$	1		$	(6)			$	(1)			$	1				—
	Traded credit default swap indices			—				—			—				—				—				—
	Other			—				-1			-1				—				-1			$	-1
	Total credit derivatives		$	-7				—		$	-7			$	-1				—			$	-1
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 December 31, 2013, and 2012. The notional amount represents the maximum amount that the seller could be required to pay. The payment/performance risk assessment is based on the default probabilities for the underlying reference entities’ debt obligations using a Moody’s credit ratings matrix known as Moody’s “Idealized” Cumulative Default Rates. 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 directly correlated to the probability that we will have to make a payment under the credit derivative contracts.
			2013													2012
	December 31,		Notional				Average			Payment /						Notional				Average				Payment /
	dollars in millions		Amount				Term			Performance						Amount				Term				Performance
							(Years)			Risk										(Years)				Risk
	Single-name credit default swaps		$	55				0.77			22.28			%		$	146				0.92				11.62			%
	Traded credit default swap indices			—				—			—						—				—				—
	Other			13				5.03			8.82						23				5.35				10.77
	Total credit derivatives sold		$	68				—			—					$	169				—				—
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 December 31, 2013, and 2012. The additional collateral amounts were calculated based on scenarios under which KeyBank’s ratings are downgraded one, two or three ratings as of December 31, 2013, and take into account all collateral already posted. A similar calculation was performed for KeyCorp, and less than $1 million of additional collateral would have been required as of December 31, 2013, and $3 million as of December 31, 2012.
	December 31,		2013							2012
	in millions		Moody’s				S&P			Moody’s				S&P
	KeyBank’s long-term senior			A3				A-			A3				A-
	unsecured credit ratings
	One rating downgrade		$	6			$	6		$	6			$	6
	Two rating downgrades			11				11			11				11
	Three rating downgrades			11				11			11				11

Mortgage_Servicing_Assets_Tabl

Mortgage Servicing Assets (Tables)	12 Months Ended
	Dec. 31, 2013
Text Block [Abstract]	'
Changes in Carrying Amount of Mortgage Servicing Assets	'
	Changes in the carrying amount of mortgage servicing assets are summarized as follows:
	Year ended December 31,		2013			2012
	in millions
	Balance at beginning of period		$	204		$	173
	Servicing retained from loan sales			48			47
	Purchases			150	(a)		44
	Amortization			(70	)		(60	)
	Balance at end of period		$	332		$	204
	Fair value at end of period		$	386		$	238
	(a)	Amount includes $120 million in mortgage servicing assets that were acquired from Bank of America’s Global Mortgages & Securitized Products business during 2013. See Note 13 (“Acquisitions and Discontinued Operations”) for further details regarding this acquisition.
Schedule of Range and Weighted-Average of Significant Unobservable Inputs	'
	The range and weighted-average of the significant unobservable inputs used to fair value our mortgage servicing assets at December 31, 2013, and 2012, along with the valuation techniques, are shown in the following table:
	December 31, 2013		Valuation Technique		Significant	Range
	dollars in millions				Unobservable Input	(Weighted-Average)
	Mortgage servicing assets		Discounted cash flow		Prepayment speed	0.9 - 72.8%(11.0%)
					Expected defaults	1.1 - 3.0%(2.1%)
					Residual cash flows discount rate	7.0 - 15.0%(7.9%)
					Escrow earn rate	0.3 - 3.3%(1.5%)
					Servicing cost	$150 - $9,296($962)
					Loan assumption rate	0.0 - 3.0%(1.43%)
					Percentage late	0.0 - 2.0%(0.35%)
	December 31, 2012		Valuation Technique		Significant	Range
	dollars in millions				Unobservable Input	(Weighted-Average)
	Mortgage servicing assets		Discounted cash flow		Prepayment speed	0.9 - 75.8%(8.60%)
					Expected defaults	1.00 - 3.00%(2.40%)
					Residual cash flows discount rate	7.00 - 15.00%(9.00%)
					Escrow earn rate	0.24 - 2.56%(1.50%)
					Servicing cost	$916 - $16,604($2,483)
					Loan assumption rate	0.00 - 3.00%(2.32%)
					Percentage late	0.00 - 2.00%(0.22%

Goodwill_and_Other_Intangible_1

Goodwill and Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2013
Goodwill And Intangible Assets Disclosure [Abstract]	'
Changes in Carrying Amount of Goodwill	'
	Changes in the carrying amount of goodwill by reporting unit are presented in the following table.
	in millions		Key		Key		Total
			Community		Corporate
			Bank		Bank
	BALANCE AT DECEMBER 31, 2011		$	917		—	$	917
	Impairment losses based on results of interim impairment testing			—		—		—
	Acquisition of Western New York branches			62		—		62
	BALANCE AT DECEMBER 31, 2012			979		—		979
	Impairment losses based on results of interim impairment testing			—		—		—
	BALANCE AT DECEMBER 31, 2013		$	979		—	$	979
Gross Carrying Amount and Accumulated Amortization of Intangible Assets	'
	The following table shows the gross carrying amount and the accumulated amortization of intangible assets subject to amortization.
			2013				2012
	December 31,		Gross Carrying		Accumulated		Gross Carrying		Accumulated
	in millions		Amount		Amortization		Amount		Amortization
	Intangible assets subject to amortization:
	Core deposit intangibles		$	105	$	70	$	105	$	56
	PCCR intangibles (a)			136		44		136		14
	Other intangible assets (b)			135		135		135		135
	Total		$	376	$	249	$	376	$	205
	(a)	PCCR intangible assets related to the 2012 acquisition of credit card receivables from Elan Financial Services, Inc. ($135 million of PCCR at acquisition date) and Western New York Branches ($1 million of PCCR at acquisition date).
	(b)	Carrying amount and accumulated amortization excludes $18 million and $25 million at December 31, 2013, and December 31, 2012, respectively, related to the discontinued operations of Austin and the sale of Victory.

Variable_Interest_Entities_Tab

Variable Interest Entities (Tables)	12 Months Ended
	Dec. 31, 2013
Text Block [Abstract]	'
Variable Interest Entities Information	'
	Our VIEs are summarized below. We define a “significant interest” in a VIE as a subordinated interest that exposes us to a significant portion, but not the majority, of the VIE’s expected losses or residual returns, even though we do not have the power to direct the activities that most significantly impact the entity’s economic performance.
		Consolidated VIEs				Unconsolidated VIEs
	in millions	Total		Total		Total		Total		Maximum
		Assets		Liabilities		Assets		Liabilities		Exposure to Loss
	31-Dec-13
	LIHTC funds	$	22	$	22	$	97		—		—
	Education loan securitization trusts		1,980		1,854		N/A		N/A		N/A
	LIHTC investments		N/A		N/A		774		—	$	503

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
Income Taxes Included in Income Statement	'
	Income taxes included in the income statement are summarized below. We file a consolidated federal income tax return.
	Year ended December 31,		2013		2012			2011
	in millions
	Currently payable:
	Federal		$	216	$	178		$	78
	State			26		18			-31
	Total currently payable			242		196			47
	Deferred:
	Federal			39		41			287
	State			-10		-6			30
	Total deferred			29		35			317
	Total income tax (benefit) expense (a)		$	271	$	231		$	364
	(a)	The income tax (benefit) expense on securities transactions totaled $1 million in 2013 and $.4 million in 2011. There was no income tax (benefit) expense on securities transactions in 2012. Income tax expense excludes equity- and gross receipts-based taxes, which are assessed in lieu of an income tax in certain states in which we operate. These taxes, which are recorded in “noninterest expense” on the income statement, totaled $23 million in 2013, $29 million in 2012, and $21 million in 2011.
Significant Components of Deferred Tax Assets and Liabilities Included in "Accrued Income and Other Assets" and "Accrued Expense and Other Liabilities"	'
	Significant components of our deferred tax assets and liabilities included in “accrued income and other assets” and “accrued expense and other liabilities,” respectively, on the balance sheet, are as follows:
	December 31,		2013		2012
	in millions
	Allowance for loan and lease losses		$	334	$	354
	Employee benefits			187		232
	Net unrealized securities losses			45		—
	Federal credit carryforwards			226		339
	State net operating losses and credits			11		15
	Other			302		327
	Gross deferred tax assets			1,105		1,267
	Less: valuation allowance			1		3
	Total deferred tax assets			1,104		1,264
	Leasing transactions			753		830
	Net unrealized securities gains			—		156
	Other			141		156
	Total deferred tax liabilities			894		1,142
	Net deferred tax assets (liabilities) (a)		$	210	$	122
	(a)	From continuing operations
Total Income Tax Expense (Benefit) and Resulting Effective Tax Rate	'
	The following table shows how our total income tax expense (benefit) and the resulting effective tax rate were derived:
	Year ended December 31,		2013					2012					2011
	dollars in millions		Amount		Rate			Amount		Rate			Amount		Rate
	Income (loss) before income taxes times 35%		$	399		35	%	$	376		35.0	%	$	466		35.0	%
	statutory federal tax rate
	Amortization of tax-advantaged investments			63		5.5			64		6.0			65		4.9
	Foreign tax adjustments			(4)		(.3	)		1		.1			17		1.3
	Reduced tax rate on lease financing income			(13)		(1.2	)		(50)		(4.7)			—		—
	Tax-exempt interest income			(15)		(1.3	)		(16)		(1.5)			(16)		(1.2)
	Corporate-owned life insurance income			(42)		(3.7	)		(43)		(4.0)			(42)		(3.2)
	Increase (decrease) in tax reserves			—		—			—		—			2		.2
	Interest refund (net of federal tax benefit)			(1)		(.1	)		—		—			(24)		(1.8)
	State income tax, net of federal tax benefit			10		0.9			8		.7			(1)		(.1)
	Tax credits			(130)		(11.4	)		(119)		(11.1)			(125)		(9.4)
	Other			4		0.3			10		.9			22		1.7
	Total income tax expense (benefit)		$	271		23.7	%	$	231		21.4	%	$	364		27.4	%
Change in Liability for Unrecognized Tax Benefits	'
	The change in our liability for unrecognized tax benefits is as follows:
	Year ended December 31,		2013		2012
	in millions
	Balance at beginning of year		$	7	$	8
	Decrease related to other settlements with taxing authorities			(1)		(1)
	Balance at end of year		$	6	$	7

Acquisition_and_Discontinued_O1

Acquisition and Discontinued Operation (Tables)	12 Months Ended
	Dec. 31, 2013
Components of Income (Loss) from Discontinued Operations, Net of Taxes for Education Lending Business	'
	The components of “income (loss) from discontinued operations, net of taxes” for the education lending business are as follows:
	Year ended December 31,		2013			2012			2011
	in millions
	Net interest income		$	105		$	119		$	138
	Provision (credit) for loan and lease losses			20			9			113
	Net interest income (expense) after provision for loan and lease losses			85			110			25
	Noninterest income			-136			-49			-55
	Noninterest expense			28			36			39
	Income (loss) before income taxes			-79			25			-69
	Income taxes			-29			9			-26
	Income (loss) from discontinued operations, net of taxes (a)		$	-50		$	16		$	-43
	(a)	Includes after-tax charges of $40 million for 2013, $50 million for 2012, and $50 million for 2011, determined by applying a matched funds transfer pricing methodology to the liabilities assumed necessary to support the discontinued operations.
Components of Assets and Liabilities of Education Lending Business	'
	The discontinued assets and liabilities of our education lending business included on the balance sheet are as follows:
	December 31,		2013			2012
	in millions
	Trust loans at fair value		$	1,960		$	2,369
	Portfolio loans at fair value			147			157
	Loans, net of unearned income of ($6) and ($5)			2,390			2,675
	Less: Allowance for loan and lease losses			39			55
	Net loans			4,458			5,146
	Trust accrued income and other assets at fair value			20			26
	Accrued income and other assets			45			60
	Total assets		$	4,523		$	5,232
	Trust accrued expense and other liabilities at fair value		$	20		$	22
	Trust securities at fair value			1,834			2,159
	Total liabilities		$	1,854		$	2,181
Quantitative Information about Level 3 Fair Value Measurements	'
	The following table shows the significant unobservable inputs used to measure the fair value of the education loan securitization trust loans and securities and the portfolio loans accounted for at fair value as of December 31, 2013, and 2012:
	December 31, 2013		Fair Value of Level 3			Valuation		Significant	Range
	dollars in millions		Assets and Liabilities			Technique		Unobservable Input	(Weighted-Average)
	Trust loans and		$	2,107		Discounted cash flow		Prepayment speed		4.00 – 13.50%(6.47%)
	portfolio loans							Loss severity		2.00 – 79.50%(54.21%)
	accounted for at fair							Discount rate		2.40 – 10.50%(3.50%)
	value							Default rate		8.01 – 23.71%(18.43%)
	Trust securities			1,834		Discounted cash flow		Discount rate		1.60 – 3.50%(2.55%)
	December 31, 2012		Fair Value of Level 3			Valuation		Significant	Range
	dollars in millions		Assets and Liabilities			Technique		Unobservable Input	(Weighted-Average)
	Trust loans and		$	2,526		Discounted cash flow		Prepayment speed		4.00 – 26.00%(9.74%)
	portfolio loans							Loss severity		2.00 –80.00%(49.61%)
	accounted for at fair							Discount rate		2.40 – 10.50%(5.12%)
	value							Default rate		8.13 –21.50%(13.44%)
	Trust securities			2,159		Discounted cash flow		Discount rate		1.50 – 6.10%(4.14%)
Principal and Fair Value Amounts for Trust Loans at Fair Value, Portfolio Loans at Fair Value, and Portfolio Loans at Carrying Value	'
	The following table shows the principal and fair value amounts for our trust loans at fair value, portfolio loans at fair value, and portfolio loans at carrying value at December 31, 2013, and 2012.
	dollars in millions		December 31, 2013						December 31, 2012
			Principal			Fair Value			Principal			Fair Value
	Trust loans at fair value
	Accruing loans past due 90 days or more		$	25		$	25		$	35		$	34
	Loans placed on nonaccrual status			12			12			14			14
	Portfolio loans at fair value
	Accruing loans past due 90 days or more		$	8		$	8		$	5		$	6
	Loans placed on nonaccrual status			—			—			—			—
	Portfolio loans at carrying value
	Accruing loans past due 90 days or more		$	35			N/A		$	44			N/A
	Loans placed on nonaccrual status			10			N/A			6			N/A
Consolidated Trusts' Assets and Liabilities at Fair Value and Contractual Values	'
	The following table shows the consolidated trusts’ assets and liabilities at fair value and the portfolio loans at fair value and their related contractual values as of December 31, 2013, and 2012.
	December 31, 2013		Contractual			Fair
	in millions		Amount			Value
	ASSETS
	Portfolio loans		$	140		$	147
	Trust loans			1,964			1,960
	Trust other assets			20			20
	LIABILITIES
	Trust securities		$	1,958		$	1,834
	Trust other liabilities			20			20
	December 31, 2012		Contractual			Fair
	in millions		Amount			Value
	ASSETS
	Portfolio loans		$	151		$	157
	Trust loans			2,443			2,369
	Trust other assets			26			26
	LIABILITIES
	Trust securities		$	2,473		$	2,159
	Trust other liabilities			22			22
Consolidated Assets and Liabilities at Fair Value on Recurring Basis	'
	The following tables present the assets and liabilities of the consolidated securitization trusts measured at fair value, as well as the portfolio loans that are measured at fair value on a recurring basis at December 31, 2013, and 2012.
	December 31, 2013		Level 1			Level 2			Level 3			Total
	in millions
	ASSETS MEASURED ON A RECURRING BASIS
	Portfolio loans			—			—		$	147		$	147
	Trust loans			—			—			1,960			1,960
	Trust other assets			—			—			20			20
	Total assets on a recurring basis at fair value			—			—		$	2,127		$	2,127
	LIABILITIES MEASURED ON A RECURRING BASIS
	Trust securities			—			—		$	1,834		$	1,834
	Trust other liabilities			—			—			20			20
	Total liabilities on a recurring basis at fair value			—			—		$	1,854		$	1,854
	December 31, 2012		Level 1			Level 2			Level 3			Total
	in millions
	ASSETS MEASURED ON A RECURRING BASIS
	Portfolio loans			—			—		$	157		$	157
	Trust loans			—			—			2,369			2,369
	Trust other assets			—			—			26			26
	Total assets on a recurring basis at fair value			—			—		$	2,552		$	2,552
	LIABILITIES MEASURED ON A RECURRING BASIS
	Trust securities			—			—		$	2,159		$	2,159
	Trust other liabilities			—			—			22			22
	Total liabilities on a recurring basis at fair value			—			—		$	2,181		$	2,181
Change in Fair Values of Level 3 Consolidated Education Loan Securitization Trusts and Portfolio Loans	'
	The following table shows the change in the fair values of the Level 3 consolidated education loan securitization trusts and portfolio loans for the years ended December 31, 2013, and 2012.
	in millions		Portfolio			Trust			Trust			Trust			Trust
			Student			Student			Other			Securities			Other
			Loans			Loans			Assets						Liabilities
	Balance at December 31, 2011		$	76		$	2,726		$	34		$	2,522		$	28
	Gains (losses) recognized in earnings (a)			3			83			—			143			—
	Purchases			86			—			—			—			—
	Sales			—			(86	)		—			—			—
	Issuances			—			—			—			—			—
	Settlements			(8	)		(354	)		(8	)		(506	)		(6	)
	Balance at December 31, 2012		$	157		$	2,369		$	26		$	2,159		$	22
	Gains (losses) recognized in earnings (a)			—			53			—			191			—
	Purchases			152			—			—			—			—
	Sales			(147	)		(152	)		—			—			—
	Issuances			—			—			—			—			—
	Settlements			(15	)		(310	)		(6	)		(516	)		(2	)
	Balance at December 31, 2013		$	147		$	1,960		$	20		$	1,834		$	20
	(a)	Gains (losses) were driven primarily by fair value adjustments.
Components of Income (Loss) from Discontinued Operations, Net of Taxes	'
	The components of “income (loss) from discontinued operations, net of taxes” for Victory, which includes the gain on the sale of this business on July 31, 2013, are as follows:
	Year ended December 31,		2013			2012			2011
	in millions
	Noninterest income		$	212		$	111		$	120
	Noninterest expense			66			89			106
	Income (loss) before income taxes			146			22			14
	Income taxes			54			8			5
	Income (loss) from discontinued operations, net of taxes		$	92		$	14		$	9
	The components of “income (loss) from discontinued operations, net of taxes” for Austin are as follows:
	Year ended December 31,		2013			2012			2011
	in millions
	Noninterest income			—			—		$	1
	Noninterest expense		$	1		$	10			2
	Income (loss) before income taxes			(1	)		(10	)		(1	)
	Income taxes			1			(3	)		—
	Income (loss) from discontinued operations, net of taxes		$	(2	)	$	(7	)	$	(1	)
Components of Assets and Liabilities from Discontinued Operations	'
	The discontinued assets and liabilities of Victory included on the balance sheet are as follows:
	December 31,		2013			2012
	in millions
	Cash and due from banks			—		$	1
	Accrued income and other assets		$	29			27
	Total assets		$	29		$	28
	Accrued expense and other liabilities			—		$	38
	Total liabilities			—		$	38
	The discontinued assets and liabilities of Austin included on the balance sheet are as follows:
	December 31,		2013			2012
	in millions
	Cash and due from banks		$	20		$	22
	Total assets		$	20		$	22
	Accrued expense and other liabilities			—		$	1
	Total liabilities			—		$	1
Victory Seller Note Measured at Fair Value on Recurring Basis	'
	The following table presents the Victory Seller note that is measured at fair value on a recurring basis through December 31, 2013.
	December 31, 2013		Level 1			Level 2			Level 3			Total
	in millions
	ASSETS MEASURED ON A RECURRING BASIS
	Seller note			—			—		$	29		$	29
	Total assets on a recurring basis at fair value			—			—		$	29		$	29
Combined Results of Discontinued Operations	'
	Combined discontinued operations.    The combined results of the discontinued operations are as follows:
	Year ended December 31,		2013			2012			2011
	in millions
	Net interest income		$	105		$	119		$	138
	Provision (credit) for loan and lease losses			20			9			113
	Net interest income (expense) after provision for loan and lease losses			85			110			25
	Noninterest income			76			62			66
	Noninterest expense			95			135			147
	Income (loss) before income taxes			66			37			(56	)
	Income taxes			26			14			(21	)
	Income (loss) from discontinued operations, net of taxes (a)		$	40		$	23		$	(35	)
	(a)	Includes after-tax charges of $40 million for 2013, $50 million for 2012, and $50 million for 2011, determined by applying a matched funds transfer pricing methodology to the liabilities assumed necessary to support the discontinued operations.
Combined Assets and Liabilities of Discontinued Operations	'
	The combined assets and liabilities of the discontinued operations are as follows:
	December 31,		2013			2012
	in millions
	Cash and due from banks		$	20		$	23
	Trust loans at fair value			1,960			2,369
	Portfolio loans at fair value			147			157
	Loans, net of unearned income of ($6) and ($5)			2,390			2,675
	Less: Allowance for loan and lease losses			39			55
	Net loans			4,458			5,146
	Trust accrued income and other assets at fair value			20			26
	Accrued income and other assets			74			87
	Total assets		$	4,572		$	5,282
	Trust accrued expense and other liabilities at fair value		$	20		$	22
	Accrued expense and other liabilities			—			39
	Trust securities at fair value			1,834			2,159
	Total liabilities		$	1,854		$	2,220
Seller Note [Member]	'
Change in Fair Values of Level 3 Consolidated Education Loan Securitization Trusts and Portfolio Loans	'
	The following table shows the change in the fair value of the Level 3 Victory Seller note for the year ended December 31, 2013.
	in millions		Seller note
	Balance at December 31, 2012			—
	Gains (losses) recognized in earnings (a)		$	(3	)
	Purchases			—
	Sales			—
	Issuances			32
	Settlements			—
	Balance at December 31, 2013		$	29
	(a)	Gains (losses) were driven primarily by fair value adjustments.

Security_Financing_Activity_Ta

Security Financing Activity (Tables)	12 Months Ended
	Dec. 31, 2013
Brokers And Dealers [Abstract]	'
Summarized Securities Financing Agreements	'
	The following table summarizes our securities financing agreements as of December 31, 2013, and 2012:
			December 31, 2013
	in millions		Gross Amount		Netting			(a)	Collateral  (b)			Net
			Presented in		Adjustments							Amounts
			Balance Sheet
	Offsetting of financial assets:
	Reverse repurchase agreements		$	347	$	(278	)		$	(66	)	$	3
	Securities borrowed			12		—				(12	)		—
	Total		$	359	$	(278	)		$	(78	)	$	3
	Offsetting of financial liabilities:
	Repurchase agreements		$	517	$	(278	)		$	(239	)		—
	Total		$	517	$	(278	)		$	(239	)		—
			31-Dec-12
	in millions		Gross Amount		Netting			(a)	Collateral (b)			Net
			Presented in		Adjustments							Amounts
			Balance Sheet
	Offsetting of financial assets:
	Reverse repurchase agreements		$	271	$	(95	)		$	(172	)	$	4
	Securities borrowed			—		—				—			—
	Total		$	271	$	(95	)		$	(172	)	$	4
	Offsetting of financial liabilities:
	Repurchase agreements		$	228	$	(95	)		$	(133	)		—
	Total		$	228	$	(95	)		$	(133	)		—
	(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.

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Assumptions Used in Options Pricing Model	'
	The assumptions pertaining to options issued during 2013, 2012, and 2011 are shown in the following table.
	Year ended December 31,		2013			2012			2011
	Average option life			6.3 years			6.3 years			6.2 years
	Future dividend yield			2.14	%		1.5	%		0.43	%
	Historical share price volatility			0.495			0.489			0.479
	Weighted-average risk-free interest rate			1.1	%		1.2	%		2.6	%
Activity, Pricing and Other Information for Stock Options	'
	The following table summarizes activity, pricing and other information for our stock options for the year ended December 31, 2013.
			Number of			Weighted-Average			Weighted-Average			Aggregate
			Options			Exercise Price Per			Remaining Life			Intrinsic
						Option			(Years)			Value (a)
	Outstanding at December 31, 2012			32,619,819		$	19.36
	Granted			1,141,294			9.33
	Exercised			(3,574,354	)		7.26
	Lapsed or canceled			(4,480,817	)		24.47
	Outstanding at December 31, 2013			25,705,942		$	19.83			4.2		$	68
	Expected to vest			4,233,326		$	8.51			8.1		$	21
	Exercisable at December 31, 2013			21,042,678		$	22.34			3.3		$	45
	(a)	The intrinsic value of a stock option is the amount by which the fair value of the underlying stock exceeds the exercise price of the option. At December 31, 2013, the fair value of the underlying stock was less than the weighted-average exercise price per option.
Activity and Pricing Information for Nonvested Shares in Long-Term Incentive Compensation Program	'
	The following table summarizes activity and pricing information for the nonvested shares in the Program for the year ended December 31, 2013.
			Vesting Contingent on						Vesting Contingent on
			Service Conditions						Performance and Service
									Conditions
			Number of			Weighted-			Number of			Weighted-
			Nonvested			Average			Nonvested			Average
			Shares			Grant-Date			Shares			Grant-Date
						Fair Value						Fair Value
	Outstanding at December 31, 2012			5,145,713		$	8.27			4,092,563		$	8.21
	Granted			2,452,490			9.33			1,632,641			13.42
	Vested			(2,392,842	)		7.9			(570,125	)		8.01
	Forfeited			(446,985	)		8.9			(511,969	)		11.91
	Outstanding at December 31, 2013			4,758,376		$	8.94			4,643,110		$	11.56
Activity and Pricing Information for Nonvested Shares Granted Under Other Restricted Stock Awards	'
	The following table summarizes activity and pricing information for the nonvested shares granted under these restricted stock or unit awards for the year ended December 31, 2013.
			Number of			Weighted-Average
			Nonvested			Grant-Date
			Shares			Fair Value
	Outstanding at December 31, 2012			2,716,654		$	7.84
	Granted			261,679			9.33
	Vested			(1,588,427	)		7.51
	Forfeited			(23,436	)		8.55
	Outstanding at December 31, 2013			1,366,470		$	8.48
Activity and Pricing Information for Nonvested Shares in Deferred Compensation Plans	'
	The following table summarizes activity and pricing information for the nonvested shares in our deferred compensation plans for the year ended December 31, 2013.
			Number of			Weighted-Average
			Nonvested			Grant-Date
			Shares			Fair Value
	Outstanding at December 31, 2012			1,195,849		$	7.00
	Granted			774,028			11.18
	Dividend equivalents			53,213			11.18
	Vested			(661,372	)		8.48
	Forfeited			(17,620	)		7.94
	Outstanding at December 31, 2013			1,344,098		$	9.06

Employee_Benefits_Tables

Employee Benefits (Tables)	12 Months Ended
	Dec. 31, 2013
Compensation And Retirement Disclosure [Abstract]	'
Net Pension Cost and Amount Recognized in OCI for All Funded and Unfunded Plans	'
	The components of net pension cost and the amount recognized in OCI for all funded and unfunded plans are as follows:
	Year ended December 31,		2013			2012			2011
	in millions
	Interest cost on PBO		$	42		$	47		$	57
	Expected return on plan assets			(67	)		(70	)		(81	)
	Amortization of losses			19			16			11
	Settlement loss			27			—			—
	Net pension cost (benefit)		$	21		$	(7	)	$	(13	)
	Other changes in plan assets and benefit obligations recognized in OCI:
	Net (gain) loss		$	(106	)	$	63		$	120
	Amortization of losses			(46	)		(16	)		(11	)
	Total recognized in comprehensive income		$	(152	)	$	47		$	109
	Total recognized in net pension cost and comprehensive income		$	(131	)	$	40		$	96
Changes in PBO Related to Pension Plans	'
	The following table summarizes changes in the PBO related to our pension plans.
	Year ended December 31,		2013			2012
	in millions
	PBO at beginning of year		$	1,277		$	1,228
	Interest cost			42			47
	Actuarial losses (gains)			(54	)		86
	Benefit payments			(109	)		(84	)
	PBO at end of year		$	1,156		$	1,277
Changes in FVA	'
	The following table summarizes changes in the FVA.
	Year ended December 31,		2013			2012
	in millions
	FVA at beginning of year		$	942		$	918
	Actual return on plan assets			119			92
	Employer contributions			18			16
	Benefit payments			(109	)		(84	)
	FVA at end of year		$	970		$	942
Funded Status of Pension Plans Recognized in Balance Sheets	'
	The following table summarizes the funded status of the pension plans, which equals the amounts recognized in the balance sheets at December 31, 2013, and 2012.
	December 31,		2013			2012
	in millions
	Funded status (a)		$	(186	)	$	(335	)
	Net prepaid pension cost recognized consists of:
	Current liabilities		$	(14	)	$	(14	)
	Noncurrent liabilities			(172	)		(321	)
	Net prepaid pension cost recognized (b)		$	(186	)	$	(335	)
	(a)	The shortage of the FVA under the PBO.
	(b)	Represents the accrued benefit liability of the pension plans.
Plans ABO in Excess of Plan Assets	'
	The ABO for all of our pension plans was $1.2 billion at December 31, 2013, and $1.3 billion at December 31, 2012. As indicated in the table below, collectively our plans had an ABO in excess of plan assets as follows:
	December 31,
	in millions		2013			2012
	PBO		$	1,156		$	1,277
	ABO			1,156			1,277
	Fair value of plan assets			970			942
Weighted-Average Rates to Determine Actuarial Present Value of Benefit Obligations	'
	To determine the actuarial present value of benefit obligations, we assumed the following weighted-average rates.
	December 31,		2013			2012
	Discount rate			4.25	%		3.25	%
	Compensation increase rate			N/A			N/A
Weighted-Average Rates to Determine Net Pension Cost	'
	To determine net pension cost, we assumed the following weighted-average rates.
	Year ended December 31,		2013			2012			2011
	Discount rate			3.25	%		4.00	%		4.75	%
	Compensation increase rate			N/A			N/A			N/A
	Expected return on plan assets			7.25			7.25			7.75
Asset Target Allocations Prescribed by Pension Funds' Investment Policies	'
	The following table shows the asset target allocations prescribed by the pension funds’ investment policies.
	Asset Class		Target
			Allocation
			2013
	Equity securities			46	%
	Fixed income securities			28
	Convertible securities			5
	Other assets			21
	Total			100	%
Fair Values of Pension Plan Assets by Asset Category	'
	The following tables show the fair values of our pension plan assets by asset class at December 31, 2013, and 2012.
	December 31, 2013
	in millions		Level 1			Level 2			Level 3			Total
	ASSET CLASS
	Equity securities:
	U.S.		$	216			—			—		$	216
	International			24			—			—			24
	Debt securities:
	Corporate bonds — U.S.			—		$	74			—			74
	Corporate bonds — International			—			11			—			11
	Government and agency bonds — U.S.			—			73			—			73
	Government bonds — International			—			1			—			1
	State and municipal bonds			—			3			—			3
	Mutual funds:
	U.S. equity			11			—			—			11
	International equity			34			—			—			34
	Fixed income — U.S.			3			—			—			3
	Fixed income — International			2			—			—			2
	Collective investment funds:
	U.S. equity			—			31			—			31
	International equity			—			151			—			151
	Convertible securities			—			54			—			54
	Fixed income securities			—			7			—			7
	Short-term investments			—			44			—			44
	Emerging markets			—			44			—			44
	Real assets			—			112			—			112
	Insurance investment contracts and pooled separate accounts			—			—		$	13			13
	Other assets			—			—			62			62
	Total net assets at fair value		$	290		$	605		$	75		$	970
	December 31, 2012
	in millions		Level 1			Level 2			Level 3			Total
	ASSET CLASS
	Equity securities:
	U.S.		$	216			—			—		$	216
	International			29			—			—			29
	Debt securities:
	Corporate bonds — U.S.			—		$	73			—			73
	Corporate bonds — International			—			10			—			10
	Government and agency bonds — U.S.			—			79			—			79
	Government bonds — International			—			3			—			3
	State and municipal bonds			—			1			—			1
	Mutual funds:
	U.S. equity			13			—			—			13
	International equity			6			2			—			8
	Fixed Income — U.S.			4			—			—			4
	Fixed Income — International			2			—			—			2
	Collective investment funds:
	U.S. equity			—			24			—			24
	International equity			—			147			—			147
	Convertible securities			—			47			—			47
	Fixed income securities			—			5			—			5
	Short-term investments			—			48			—			48
	Emerging markets			—			47			—			47
	Real assets			—			118			—			118
	Insurance investment contracts and pooled separate accounts			—			—		$	12			12
	Other assets			—			—			56			56
	Total net assets at fair value		$	270		$	604		$	68		$	942
Changes in Fair Values of Level 3 Plan Assets	'
	The following table shows the changes in the fair values of our Level 3 plan assets for the years ended December 31, 2013, and 2012.
	in millions		Insurance			Other			Total
			Investment			Assets
			Contracts and
			Pooled
			Separate
			Accounts
	Balance at December 31, 2011		$	12		$	4		$	16
	Actual return on plan assets:
	Relating to assets held at reporting date			1			2			3
	Relating to assets sold during the period			—			-3			-3
	Purchases			—			55			55
	Sales			-1			-2			-3
	Balance at December 31, 2012		$	12		$	56		$	68
	Actual return on plan assets:
	Relating to assets held at reporting date			1			6			7
	Balance at December 31, 2013		$	13		$	62		$	75
Pre-tax AOCI Not Yet Recognized as Net Postretirement Benefit Cost	'
	The components of pre-tax AOCI not yet recognized as net postretirement benefit cost are shown below.
	December 31,
	in millions		2013			2012
	Net unrecognized losses (gains)		$	(12	)	$	5
	Net unrecognized prior service benefit			(5	)		-7
	Total unrecognized AOCI		$	(17	)	$	-2
Net Postretirement Benefit Cost and Amount Recognized in OCI for All Funded and Unfunded Plans	'
	The components of net postretirement benefit cost and the amount recognized in OCI for all funded and unfunded plans are as follows:
	December 31,
	in millions		2013			2012			2011
	Service cost of benefits earned		$	1		$	1		$	1
	Interest cost on APBO			3			3			3
	Expected return on plan assets			(3	)		(3	)		-3
	Amortization of prior service credit			(1	)		(1	)		-1
	Net postretirement benefit cost			—			—			—
	Other changes in plan assets and benefit obligations recognized in OCI:
	Net (gain) loss		$	(17	)	$	(3	)	$	8
	Amortization of prior service credit			1			1			1
	Total recognized in comprehensive income		$	(16	)	$	(2	)	$	9
	Total recognized in net postretirement benefit cost and comprehensive income		$	(16	)	$	(2	)	$	9
Changes in APBO	'
	The following table summarizes changes in the APBO.
	Year ended December 31,
	in millions		2013			2012
	APBO at beginning of year		$	74		$	81
	Service cost			1			1
	Interest cost			3			3
	Plan participants’ contributions			1			2
	Actuarial losses (gains)			-6			1
	Benefit payments			-8			-7
	Liability (gain)/loss due to settlement			—			-7
	APBO at end of year		$	65		$	74
Change in FVA (Other Post Retirement Benefit Plan Assets)	'
	The following table summarizes changes in FVA.
	Year ended December 31,
	in millions		2013			2012
	FVA at beginning of year		$	51		$	57
	Employer contributions			—			-1
	Plan participants’contributions			1			2
	Benefit payments			-8			-7
	Transfer to insurer			—			-7
	Actual return on plan assets			13			7
	FVA at end of year		$	57		$	51
Funded Status of Postretirement Plans Recognized in Balance Sheets	'
	The following table summarizes the funded status of the postretirement plans, which corresponds to the amounts recognized in the balance sheets at December 31, 2013, and 2012.
	December 31,
	in millions		2013			2012
	Funded status (a)		$	(8	)	$	(23	)
	Accrued postretirement benefit cost recognized (b)			(8	)		(23	)
	(a)	The shortage of the FVA under the APBO.
	(b)	Consists entirely of noncurrent liabilities.
Weighted-Average Rates to Determine Net Postretirement Benefit Cost	'
	To determine net postretirement benefit cost, we assumed the following weighted-average rates.
	Year ended December 31,		2013			2012			2011
	Discount rate			3.5	%		4	%		4.75	%
	Expected return on plan assets			5.25			5.58			5.45
Asset Target Allocation Ranges Prescribed by Trusts' Investment Policies	'
	The following table shows the asset target allocation ranges prescribed by the trust’s investment policy.
	Asset Class		Target Allocation
			Range
			2013
	Equity securities			70 - 90	%
	Fixed income securities			0 - 10
	Convertible securities			0 - 10
	Cash equivalents and other assets			30-Oct
Fair Values of Postretirement Plan Assets by Asset Category	'
	The following tables show the fair values of our postretirement plan assets by asset class at December 31, 2013, and 2012.
	December 31, 2013
	in millions		Level 1			Level 2			Level 3			Total
	ASSET CLASS
	Mutual funds — U.S. equity		$	6			—			—		$	6
	Common investment funds:
	U.S. equity			—		$	29			—			29
	International equity			—			9			—			9
	Convertible securities			—			3			—			3
	Fixed income			—			2			—			2
	Short-term investments			—			8			—			8
	Total net assets at fair value		$	6		$	51			—		$	57
	December 31, 2012
	in millions		Level 1			Level 2			Level 3			Total
	ASSET CLASS
	Mutual funds — U.S. equity		$	7			—			—		$	7
	Common investment funds:
	U.S. equity			—		$	26			—			26
	International equity			—			8			—			8
	Convertible securities			—			4			—			4
	Fixed income			—			2			—			2
	Short-term investments			—			4			—			4
	Total net assets at fair value		$	7		$	44			—		$	51

ShortTerm_Borrowings_Tables

Short-Term Borrowings (Tables)	12 Months Ended
	Dec. 31, 2013
Debt Disclosure [Abstract]	'
Components of Short-Term Borrowings	'
	Selected financial information pertaining to the components of our short-term borrowings is as follows:
	December 31,
	dollars in millions	2013			2012			2011
	FEDERAL FUNDS PURCHASED
	Balance at year end	$	18		$	8		$	25
	Average during the year		164			111			120
	Maximum month-end balance		1,486			613			844
	Weighted-average rate during the year		0.09	%		0.14	%		0.13	%
	Weighted-average rate at December 31		0.1			0.15			0.08
	SECURITIES SOLD UNDER REPURCHASE AGREEMENTS
	Balance at year end	$	1,516		$	1,601		$	1,686
	Average during the year		1,638			1,703			1,861
	Maximum month-end balance		2,099			2,455			2,286
	Weighted-average rate during the year		0.13	%		0.19	%		0.28	%
	Weighted-average rate at December 31		0.15			0.14			0.25
	OTHER SHORT-TERM BORROWINGS
	Balance at year end	$	343		$	287		$	337
	Average during the year		394			413			619
	Maximum month-end balance		466			599			1,007
	Weighted-average rate during the year		1.89	%		1.69	%		1.84	%
	Weighted-average rate at December 31		2			1.81			1.6

LongTerm_Debt_Tables

Long-Term Debt (Tables)	12 Months Ended
	Dec. 31, 2013
Debt Disclosure [Abstract]	'
Components of Long-Term Debt	'
	The following table presents the components of our long-term debt, net of unamortized discounts and adjustments related to hedging with derivative financial instruments. We use interest rate swaps and caps, which modify the repricing characteristics of certain long-term debt, to manage interest rate risk. For more information about such financial instruments, see Note 8 (“Derivatives and Hedging Activities”).
	December 31,
	dollars in millions		2013		2012
	Senior medium-term notes due through 2021 (a)		$	2,553	$	2,653
	0.988% Subordinated notes due 2028 (b)			162		162
	6.875% Subordinated notes due 2029 (b)			103		117
	7.750% Subordinated notes due 2029 (b)			133		152
	Total parent company			2,951		3,084
	Senior medium-term notes due through 2039 (c)			1,858		129
	Senior Euro medium-term notes due through 2013 (d)			—		26
	7.413% Subordinated remarketable notes due 2027 (e)			270		268
	5.80% Subordinated notes due 2014 (e)			768		803
	4.95% Subordinated notes due 2015 (e)			251		251
	5.45% Subordinated notes due 2016 (e)			544		564
	5.70% Subordinated notes due 2017 (e)			229		241
	4.625% Subordinated notes due 2018 (e)			104		108
	6.95% Subordinated notes due 2028 (e)			298		300
	Lease financing debt due through 2016 (f)			5		9
	Secured borrowing due through 2018 (g)			58		—
	Federal Home Loan Bank advances due through 2036 (h)			224		974
	Investment Fund Financing due through 2052 (i)			90		90
	Total subsidiaries			4,699		3,763
	Total long-term debt		$	7,650	$	6,847
	(a)	The senior medium-term notes had weighted-average interest rates of 3.89% at December 31, 2013, and 5.11% at December 31, 2012. These notes had a combination of fixed and floating interest rates during 2012; however, these notes had fixed interest rates at December 31, 2013, and 2012. One of the three notes can be redeemed one month prior to its maturity date, while the other two notes may not be redeemed prior to their maturity dates.
	(b)	See Note 19 (“Trust Preferred Securities Issued by Unconsolidated Subsidiaries”) for a description of these notes.
	(c)	Senior medium-term notes had weighted-average interest rates of 1.58% at December 31, 2013, and 5.03% at December 31, 2012. These notes had a combination of fixed and floating interest rates. Two of the five notes can be redeemed one month prior to their maturity dates, while the other three notes may not be redeemed prior to their maturity dates. 2013 issuances were at considerably lower rates than existing debt.
	(d)	Senior Euro medium-term notes matured during 2013 and had weighted-average interest rates of .64% at December 31, 2012. These notes had a combination of fixed and floating interest rates based on LIBOR.
	(e)	These notes are all obligations of KeyBank. Only the subordinated remarketable notes due 2027 may be redeemed prior to their maturity dates.
	(f)	Lease financing debt had weighted-average interest rates of 5.99% at December 31, 2013, and 6.20% at December 31, 2012. This category of debt consists primarily of nonrecourse debt collateralized by leased equipment under operating, direct financing and sales-type leases.
	(g)	The secured borrowing had weighted-average interest rates of 4.79% at December 31, 2013. This borrowing is collateralized by commercial lease financing receivables, and principal reductions are based on the cash payments received from the related receivables. Additional information pertaining to these commercial lease financing receivables is included in Note 4 (“Loans and Loans Held for Sale”).
	(h)	Long-term advances from the Federal Home Loan Bank had weighted-average interest rates of 3.47% at December 31, 2013, and 1.09% at December 31, 2012. These advances, which had a combination of fixed and floating interest rates, were secured by real estate loans and securities totaling $337 million at December 31, 2013, and $1.6 billion at December 31, 2012.
	(i)	Investment Fund Financing had a weighted-average interest rate of 2.01% at December 31, 2013, and 2012.
Scheduled Principal Payments on Long-Term Debt	'
	At December 31, 2013, scheduled principal payments on long-term debt were as follows:
	in millions		Parent		Subsidiaries		Total
	2014			—	$	816	$	816
	2015		$	764		506		1,270
	2016			—		1,243		1,243
	2017			—		255		255
	2018			739		1,101		1,840
	All subsequent years			1,448		778		2,226

Trust_Preferred_Securities_Iss1

Trust Preferred Securities Issued by Unconsolidated Subsidiaries (Tables)	12 Months Ended
	Dec. 31, 2013
Text Block [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		Common		Principal		Interest Rate			Maturity
			Securities,		Stock		Amount of		of Trust Preferred			of Trust Preferred
			Net of Discount        (a)				Debentures,		Securities and			Securities and
							Net of Discount     (b)		Debentures      (c)			Debentures
	31-Dec-13
	KeyCorp Capital I		$	156	$	6	$	162		0.988	%		2028
	KeyCorp Capital II			99		4		103		6.875			2029
	KeyCorp Capital III			129		4		133		7.75			2029
	Total		$	384	$	14	$	398		4.777	%		—
	31-Dec-12		$	417	$	14	$	431		5.025	%		—
	(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 $44 million at December 31, 2013, and $77 million at December 31, 2012. See Note 8 (“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 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: (a) the principal amount, plus any accrued but unpaid interest, or (b) 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 $44 million at December 31, 2013, and $77 million at December 31, 2012. See Note 8 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. KeyCorp Capital I has a floating interest rate, equal to three-month LIBOR plus 74 basis points, that reprices quarterly. The total interest rates are weighted-average rates.

Commitments_Contingent_Liabili1

Commitments, Contingent Liabilities and Guarantees (Tables)	12 Months Ended
	Dec. 31, 2013
Commitments And Contingencies Disclosure [Abstract]	'
Commitments to Extend Credit or Funding	'
	The following table shows the remaining contractual amount of each class of commitment related to extending credit or funding principal investments as of December 31, 2013, and 2012. For loan commitments and commercial letters of credit, this amount represents our maximum possible accounting loss if the borrower were to draw upon the full amount of the commitment and subsequently default on payment for the total amount of the outstanding loan.
	December 31,		2013		2012
	in millions
	Loan commitments:
	Commercial and other		$	23,611	$	20,804
	Commercial real estate and construction			2,104		1,537
	Home equity			7,193		7,255
	Credit cards			3,457		3,611
	Total loan commitments			36,365		33,207
	When-issued and to be announced securities commitments			140		96
	Commercial letters of credit			119		100
	Principal investing commitments			75		94
	Liabilities of certain limited partnerships and other commitments			2		5
	Total loan and other commitments		$	36,701	$	33,502
Guarantees	'
	The following table shows the types of guarantees that we had outstanding at December 31, 2013. 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”).
	December 31, 2013		Maximum Potential		Liability
	in millions		Undiscounted		Recorded
			Future Payments
	Financial guarantees:
	Standby letters of credit		$	10,630	$	72
	Recourse agreement with FNMA			1,360		—
	Return guarantee agreement with LIHTC investors			11		11
	Written put options (a)			2,741		22
	Total		$	14,742	$	105
	(a)	The maximum potential undiscounted future payments represent notional amounts of derivatives qualifying as guarantees.

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Income (Tables)	12 Months Ended
	Dec. 31, 2013
Text Block [Abstract]	'
Changes in AOCI	'
	Our changes in AOCI for the year ended December 31, 2013, are as follows:
	in millions		Unrealized gains			Unrealized gains			Foreign currency			Net pension and			Total
			(losses) on available			(losses) on derivative			translation			postretirement
			for sale securities			financial instruments			adjustment			benefit costs
	Balance at December 31, 2012		$	229		$	18		$	55		$	(426	)	$	(124	)
	Other comprehensive income before reclassification, net of income taxes			(291	)		6			(9	)		78			(216	)
	Amounts reclassified from accumulated other comprehensive income, net of income taxes (a)			(1	)		(35	)		(4	)		28			(12	)
	Net current-period other comprehensive income, net of income taxes			(292	)		(29	)		(13	)		106			(228	)
	Balance at December 31, 2013		$	(63	)	$	(11	)	$	42		$	(320	)	$	(352	)
	(a)	See table below for details about these reclassifications.
Reclassifications Out of AOCI	'
	Our reclassifications out of AOCI for the year ended December 31, 2013, are as follows:
	Year ended December 31, 2013		Amount Reclassified from			Affected Line Item in the Statement
			Accumulated Other			Where Net Income is Presented
	in millions		Comprehensive Income
	Unrealized gains (losses) on available for sale securities
	Realized gains		$	1		Other income
				1		Income (loss) from continuing operations before income taxes
				—		Income taxes
			$	1		Income (loss) from continuing operations
	Unrealized gains (losses) on derivative financial instruments
	Interest rate		$	67		Interest income — Loans
	Interest rate			(8	)	Interest expense — Long term debt
	Foreign exchange contracts			(3	)	Other income
				56		Income (loss) from continuing operations before income taxes
				21		Income taxes
			$	35		Income (loss) from continuing operations
	Foreign currency translation adjustment
			$	7		Corporate services income
				7		Income (loss) from continuing operations before income taxes
				3		Income taxes
			$	4		Income (loss) from continuing operations
	Net pension and postretirement benefit costs
	Amortization of losses		$	(46	)	Personnel expense
	Amortization of prior service credit			1		Personnel expense
				(45	)	Income (loss) from continuing operations before income taxes
				(17	)	Income taxes
			$	(28	)	Income (loss) from continuing operations

Shareholders_Equity_Tables

Shareholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2013
Equity [Abstract]	'
Key's and KeyBank's Actual Capital Amounts and Ratios, Minimum Capital Amounts and Ratios	'
		Actual					To Meet Minimum					To Qualify as Well Capitalized
							Capital Adequacy					Under Federal Deposit
							Requirements					Insurance Act
	dollars in millions	Amount		Ratio			Amount		Ratio			Amount		Ratio
	December 31, 2013
	TOTAL CAPITAL TO NET RISK-WEIGHTED ASSETS
	Key	$	11,941		14.33	%	$	6,666		8.00	%		N/A		N/A
	KeyBank (consolidated)		10,451		13.33			6,273		8		$	7,841		10.00	%
	TIER 1 CAPITAL TO NET RISK-WEIGHTED ASSETS
	Key	$	9,968		11.96	%	$	3,333		4	%		N/A		N/A
	KeyBank (consolidated)		8,496		10.83			3,136		4		$	4,705		6	%
	TIER 1 CAPITAL TO AVERAGE QUARTERLY TANGIBLE ASSETS
	Key	$	9,968		11.11	%	$	2,691		3	%		N/A		N/A
	KeyBank (consolidated)		8,496		9.69			3,507		4		$	4,384		5	%
	December 31, 2012
	TOTAL CAPITAL TO NET RISK-WEIGHTED ASSETS
	Key	$	12,066		15.13	%	$	6,379		8	%		N/A		N/A
	KeyBank (consolidated)		10,321		13.73			6,013		8		$	7,516		10	%
	TIER 1 CAPITAL TO NET RISK-WEIGHTED ASSETS
	Key	$	9,689		12.15	%	$	3,189		4	%		N/A		N/A
	KeyBank (consolidated)		7,989		10.63			3,006		4		$	4,510		6	%
	TIER 1 CAPITAL TO AVERAGE QUARTERLY TANGIBLE ASSETS
	Key	$	9,689		11.41	%	$	2,547		3	%		N/A		N/A
	KeyBank (consolidated)		7,989		9.69			3,299		4		$	4,124		5	%

Line_of_Business_Results_Table

Line of Business Results (Tables)	12 Months Ended
	Dec. 31, 2013
Segment Reporting [Abstract]	'
Financial Information of Business Groups	'
	Accordingly, financial results may be revised periodically to reflect enhanced alignment of expense base allocation drivers, changes in the risk profile of a particular business, or changes in our organizational structure.
	Year ended December 31,		Key Community Bank												Key Corporate Bank
	dollars in millions		2013				2012				2011				2013				2012				2011
	SUMMARY OF OPERATIONS
	Net interest income (TE)		$	1,425			$	1,472			$	1,456			$	756			$	770			$	757
	Noninterest income			766				753				750				782				751				742
	Total revenue (TE) (a)			2,191				2,225				2,206				1,538				1,521				1,499
	Provision (credit) for loan and lease losses			156				150				148				(6	)			24				(198	)
	Depreciation and amortization expense			76				55				38				43				55				89
	Other noninterest expense			1,718				1,815				1,716				811				791				736
	Income (loss) from continuing operations before income taxes (TE)			241				205				304				690				651				872
	Allocated income taxes (benefit) and TE adjustments			90				76				113				246				239				318
	Income (loss) from continuing operations			151				129				191				444				412				554
	Income (loss) from discontinued operations, net of taxes			—				—				—				—				—				—
	Net income (loss)			151				129				191				444				412				554
	Less: Net income (loss) attributable to noncontrolling interests			—				—				—				—				3				—
	Net income (loss) attributable to Key		$	151			$	129			$	191			$	444			$	409			$	554
	AVERAGE BALANCES (b)
	Loans and leases		$	29,309			$	27,200			$	25,599			$	20,447			$	18,879			$	17,410
	Total assets (a)			31,628				29,616				27,781				24,361				22,983				21,542
	Deposits			49,723				48,644				47,643				15,778				12,637				10,798
	OTHER FINANCIAL DATA
	Expenditures for additions to long-lived assets (a), (b)		$	6			$	318			$	117			$	9			$	10			$	15
	Net loan charge-offs (b)			147				195				274				1				64				138
	Return on average allocated equity (b)			5.3	%			4.56	%			6.22	%			27.39	%			23.81	%			25.2	%
	Return on average allocated equity			5.3				4.56				6.22				27.39				23.81				25.2
	Average full-time equivalent employees (c)			8,202				8,784				8,399				1,968				1,997				2,006
	(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 has not been adjusted for discontinued operations.
	Other Segments												Total Segments												Reconciling Items									Key
	2013				2012				2011				2013				2012				2011				2013			2012			2011			2013			2012			2011
	$	166			$	39				$             61			$	2,347			$	2,281			$	2,274			$	1		$	7			$           18		$	2,348		$	2,288		$	2,292
		221				375				238				1,769				1,879				1,730				(3	)		(23	)		-42			1,766			1,856			1,688
		387				414				299				4,116				4,160				4,004				(2	)		(16	)		(24	)		4,114			4,144			3,980
		(21	)			55				(5	)			129				229				(55	)			1			—			(5	)		130			229			(60	)
		6				9				18				125				119				145				134			131			125			259			250			270
		67				100				95				2,596				2,706				2,547				(35	)		(138	)		(133	)		2,561			2,568			2,414
		335				250				191				1,266				1,106				1,367				(102	)		(9	)		(11	)		1,164			1,097			1,356
		21				(10	)			(30	)			357				305				401				(63	)		(50	)		(12	)		294			255			389
		314				260				221				909				801				966				(39	)		41			1			870			842			967
		—				—				—				—				—				—				40			23			(35	)		40			23			(35	)
		314				260				221				909				801				966				1			64			(34	)		910			865			932
		—				4				12				—				7				12				—			—			—			—			7			12
	$	314			$	256			$	209			$	909			$	794			$	954			$	1		$	64		$	(34	)	$	910		$	858		$	920
	$	3,242			$	4,234			$	5,544			$	52,998			$	50,313			$	48,553			$	56		$	49		$	53		$	53,054		$	50,362		$	48,606
		27,676				27,630				31,629				83,665				80,229				80,952				512			613			1,097			84,177			80,842			82,049
		729				703				971				66,230				61,984				59,412				(353	)		(149	)		(149	)		65,877			61,835			59,263
		—				—				—			$	15			$	328			$	132			$	73		$	76		$	79		$	88		$	404		$	211
	$	20			$	86			$	129				168				345				541				—			—			—			168			345			541
		46.66	%			32.32	%			22.19	%			17.67	%			14.87	%			15.36	%			(.76	)%		0.85	%		0.02	%		8.44	%		8.21	%		9.32	%
		46.66				32.32				22.19				17.67				14.87				15.36				0.02			1.33			(.84	)		8.83			8.44			8.98
		54				53				75				10,224				10,834				10,480				4,559			4,755			4,901			14,783			15,589			15,381

Condensed_Financial_Informatio1

Condensed Financial Information of the Parent Company (Tables)	12 Months Ended
	Dec. 31, 2013
Condensed Financial Information Of Parent Company Only Disclosure [Abstract]	'
Condensed Balance sheets	'
	CONDENSED BALANCE SHEETS
	December 31,		2013			2012
	in millions
	ASSETS
	Cash and due from banks and interest-bearing deposits		$	2,453		$	2,206
	Loans and advances to:
	Banks			90			90
	Nonbank subsidiaries			482			619
	Total loans and advances			572			709
	Investment in subsidiaries:
	Banks			9,310			9,155
	Nonbank subsidiaries			739			707
	Total investment in subsidiaries			10,049			9,862
	Accrued income and other assets			611			1,151
	Total assets		$	13,685		$	13,928
	LIABILITIES
	Accrued expense and other liabilities		$	431		$	573
	Long-term debt due to:
	Subsidiaries			398			431
	Unaffiliated companies			2,553			2,653
	Total long-term debt			2,951			3,084
	Total liabilities			3,382			3,657
	SHAREHOLDERS’ EQUITY (a)			10,303			10,271
	Total liabilities and shareholders’ equity		$	13,685		$	13,928
	(a)	See Key’s Consolidated Statements of Changes in Equity.
Condensed Statements of Income	'
	CONDENSED STATEMENTS OF INCOME
	Year ended December 31,
	in millions		2013			2012			2011
	INCOME
	Dividends from subsidiaries:
	Bank subsidiaries		$	600		$	1,775			—
	Nonbank subsidiaries			—			—		$	345
	Interest income from subsidiaries			26			36			67
	Other income			15			66			18
	Total income			641			1,877			430
	EXPENSE
	Interest on long-term debt with subsidiary trusts			14			29			53
	Interest on other borrowed funds			59			86			89
	Personnel and other expense			85			91			178
	Total expense			158			206			320
	Income (loss) before income taxes and equity in net income (loss) less dividends from subsidiaries			483			1,671			110
	Income tax (expense) benefit			40			57			73
	Income (loss) before equity in net income (loss) less dividends from subsidiaries			523			1,728			183
	Equity in net income (loss) less dividends from subsidiaries (a)			387			(863	)		749
	NET INCOME (LOSS)			910			865			932
	Less: Net income attributable to noncontrolling interests			—			7			12
	NET INCOME (LOSS) ATTRIBUTABLE TO KEY		$	910		$	858		$	920
	(a)	Includes results of discontinued operations described in Note 13 (“Acquisitions and Discontinued Operations”).
Condensed Statements of Cash Flows	'
	CONDENSED STATEMENTS OF CASH FLOWS
	Year ended December 31,
	in millions		2013			2012			2011
	OPERATING ACTIVITIES
	Net income (loss) attributable to Key		$	910		$	858			$      920
	Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
	Deferred income taxes			—			17			(39	)
	Equity in net (income) loss less dividends from subsidiaries (a)			(387	)		863			(749	)
	Net (increase) decrease in other assets			245			(158	)		(130	)
	Net increase (decrease) in other liabilities			103			85			(43	)
	Other operating activities, net			20			13			83
	NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES			891			1,678			42
	INVESTING ACTIVITIES
	Net (increase) decrease in interest-bearing deposits(b)			2,115			(2,048	)		3,207
	Purchases of securities available for sale			(14	)		(34	)		(18	)
	Proceeds from sales, prepayments and maturities of securities available for sale			39			1			32
	Net (increase) decrease in loans and advances to subsidiaries			(4	)		36			939
	Net (increase) decrease in investments in subsidiaries			—			—			2
	NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES			2,136			(2,045	)		4,162
	FINANCING ACTIVITIES
	Net proceeds from issuance of long-term debt			750			—			1,000
	Payments on long-term debt			(750	)		(1,149	)		(1,043	)
	Repurchase of Treasury Shares			(474	)		(251	)		—
	Series B Preferred Stock — TARP redemption			—			—			(2,500	)
	Repurchase of common share warrant			—			—			(70	)
	Net proceeds from the issuance of common shares and preferred stock			26			2			604
	Cash dividends paid			(217	)		(191	)		(164	)
	NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES			(665	)		(1,589	)		(2,173	)
	NET INCREASE (DECREASE) IN CASH AND DUE FROM BANKS(b)			2,362			(1,956	)		2,031
	CASH AND DUE FROM BANKS AT BEGINNING OF YEAR			75			2,031			—
	CASH AND DUE FROM BANKS AT END OF YEAR		$	2,437		$	75		$	2,031
	(a)	Includes results of discontinued operations described in Note 13 (“Acquisitions and Discontinued Operations”).
	(b)	During 2011, we shut down the Eurosweep (interest-bearing) deposit account and moved the deposits to an interest-bearing account within KeyCorp.

Summary_of_Significant_Account2

Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
	CallCentre
	Branches
	States
	ATM
	Segment
Accounting Policies [Line Items]	'	'
Consolidated total assets of the Company	$92,934,000,000	$89,236,000,000
Number of retail branches	1,028	'
Number of telephone banking call center services group	1	'
Number of automated teller machines	1,335	'
Number of States with Automated Teller Machines	12	'
Number of Business Groups	2	'
Number of days to designate the loan as nonaccrual for commercial loan payment due period	'90 days	'
Number of days to designate commercial loans will be charged off in full or charged down to the fair value of the underlying collateral payment due period	'180 days	'
Second lien home equity loan with associated first lien due period	'120 days or more	'
Number of days to designate charge-off policy for credit card loans and similar unsecured products taking effect, payment due period	'180 days	'
Number of days to designate the loan as nonaccrual for consumer payment due period	'120 days	'
Number of days to designate the charge-off policy for most consumer loans taking effect, payment due period	'120 days	'
Number of days to designate home equity and residential mortgage loans to get charged down to the fair value of the underlying collateral payment due period	'180 days	'
Maximum level for the impaired loans' outstanding balance leading to a further analysis to determine the probable loss content and assign a specific allowance to the loan	2,500,000	'
Nonperforming loans, collectively evaluated for impairment	54,083,000,000	52,388,000,000
Liability for credit losses on lending-related commitments	42,000,000	35,000,000
Minimum percentage for an input to be significant of the total fair value of a particular asset or liability	10.00%	'
Percentage of principal investment	57.00%	59.00%
Fair value of principal investments held in private companies	554,000,000	627,000,000
Fair value at end of year	386,000,000	238,000,000
Accumulated depreciation and amortization on premises and equipment, total	1,200,000,000	1,200,000,000
Internally Developed Software	60,000,000	53,000,000
Capitalized Computer Software Amortization Maximum Period Allowable	'5 years	'
Vesting period for compensation cost	'4 years	'3 years
Amortization period of stock-based compensation awards	'5 years	'4 years
Rate at which employee stock options to be exercisable	33.33%	'
Rate at which employee stock options granted to be exercisable	25.00%	'
Minimum [Member]	'	'
Accounting Policies [Line Items]	'	'
Intangible assets useful life	'7 years	'
Maximum [Member]	'	'
Accounting Policies [Line Items]	'	'
Nonperforming loans, collectively evaluated for impairment	2,500,000	'
Intangible assets useful life	'30 years	'
Options expiration years	'10 years	'
RE Commercial [Member]	'	'
Accounting Policies [Line Items]	'	'
Fair value at end of year	332,000,000	204,000,000
Allowance for Loans and Leases Receivable [Member]	'	'
Accounting Policies [Line Items]	'	'
Liability for credit losses on lending-related commitments	$37,000,000	$29,000,000
Equity Method Investments [Member]	'	'
Accounting Policies [Line Items]	'	'
Economic interest in unconsolidated investments in voting rights entities, minimum	20.00%	'
Economic interest in unconsolidated investments in voting rights entities, maximum	50.00%	'
Cost Method Investments [Member]	'	'
Accounting Policies [Line Items]	'	'
Economic interest in unconsolidated investments in voting rights entities, Ownership less than	20.00%	'

Earnings_Per_Common_Share_Addi

Earnings Per Common Share - Additional Information (Detail) (Share Options and Other Stock Awards [Member])	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013
Share Options and Other Stock Awards [Member]	'
Earnings Per Common Share [Line Items]	'
Weighted average common shares outstanding	6

Earnings_Per_Common_Share_Basi

Earnings Per Common Share - Basic and Diluted Earnings Per Common Share (Detail) (USD $)	12 Months Ended
In Millions, except Share data in Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
EARNINGS	'		'		'
Income (loss) from continuing operations	$870		$842		$967
Less: Net income (loss) attributable to noncontrolling interests	'		7		12
Income (loss) from continuing operations attributable to Key	870		835		955
Amortization of discount on Series B Preferred Stock	'		'		53
Income (loss) from continuing operations attributable to Key common shareholders	847		813		848
Income (loss) from discontinued operations, net of taxes	40		23		-35
Net income (loss) attributable to Key common shareholders	887		836		813
WEIGHTED-AVERAGE COMMON SHARES	'		'		'
Weighted-average common shares outstanding	906,524	[1]	938,941	[1]	931,934	[1]
Effect of dilutive convertible preferred stock, common stock options and other stock awards	6,047		4,318		3,867
Weighted-average common shares and potential common shares outstanding	912,571		943,259		935,801
EARNINGS PER COMMON SHARE	'		'		'
Income (loss) from continuing operations attributable to Key common shareholders	$0.93		$0.87		$0.91
Income (loss) from discontinued operations, net of taxes	$0.04		$0.02		($0.04)
Net income (loss) attributable to Key common shareholders	$0.98	[2]	$0.89	[2]	$0.87	[2]
Income (loss) from continuing operations attributable to Key common shareholders - assuming dilution	$0.93		$0.86		$0.91
Income (loss) from discontinued operations, net of taxes	$0.04		$0.02		($0.04)
Net income (loss) attributable to Key common shareholders - assuming dilution	$0.97	[2]	$0.89	[2]	$0.87	[2]
Series A Preferred Stock [Member]	'		'		'
EARNINGS	'		'		'
Less: Dividends on Preferred Stock	23		22		23
Series B Preferred Stock [Member]	'		'		'
EARNINGS	'		'		'
Less: Dividends on Preferred Stock	'		'		$31
[1]	Assumes conversion of stock options and/or Series A Preferred Stock, as applicable.
[2]	EPS may not foot due to rounding.

Earnings_Per_Common_Share_Basi1

Earnings Per Common Share - Basic and Diluted Earnings Per Common Share (Parenthetical) (Detail) (USD $)	3 Months Ended
	Mar. 31, 2011
Earnings Per Common Share [Line Items]	'
Amortization of discount on preferred stock including deemed dividend	$49,000,000
Series B Preferred Stock [Member]	'
Earnings Per Common Share [Line Items]	'
Repurchase of the Fixed-Rate Perpetual Preferred Stock	$2,500,000,000

Restrictions_on_Cash_Dividends1

Restrictions on Cash, Dividends and Lending Activities - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013
Restricted Cash and Cash Equivalents Items [Line Items]	'
Average reserve balance maintained	$291,000,000
Short-term investments held for discharge of obligations	2,500,000,000
Capital infusions to subsidiary	0
KeyBank (consolidated) [Member]	'
Restricted Cash and Cash Equivalents Items [Line Items]	'
Dividends paid by non banking subsidiaries	$600,000,000

Loans_and_Loans_Held_for_Sale_1

Loans and Loans Held for Sale - Loans by Category (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Loans [Line Items]	'	'
Commercial, financial and agricultural	$24,963	$23,242
Commercial real estate:	'	'
Commercial mortgage	7,720	7,720
Construction	1,093	1,003
Total commercial real estate loans	8,813	8,723
Commercial lease financing	4,551	4,915
Total commercial loans	38,327	36,880
Residential - prime loans:	'	'
Real estate - residential mortgage	2,187	2,174
Home equity loans	10,674	10,239
Total residential - prime loans	12,861	12,413
Consumer other	1,098	1,451
Credit cards	722	729
Total consumer loans	16,130	15,942
Total Loans	54,457	52,822
Other Loans [Member]	'	'
Residential - prime loans:	'	'
Home equity loans	334	423
Consumer other	70	93
Marine Loans [Member]	'	'
Residential - prime loans:	'	'
Consumer other	1,028	1,358
Key Community Bank [Member]	'	'
Residential - prime loans:	'	'
Home equity loans	10,340	9,816
Consumer other	$1,449	$1,349

Loans_and_Loans_Held_for_Sale_2

Loans and Loans Held for Sale - Loans by Category (Parenthetical) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Loans [Line Items]	'	'
Commercial, financial and agricultural	$24,963,000,000	$23,242,000,000
Commercial lease financing includes receivables held as collateral for secured borrowing	58,000,000	'
Purchased loans	166,000,000	217,000,000
Commercial Credit Card [Member]	'	'
Loans [Line Items]	'	'
Commercial, financial and agricultural	94,000,000	90,000,000
PCI Loans [Member]	'	'
Loans [Line Items]	'	'
Purchased loans	16,000,000	23,000,000
Segment, Discontinued Operations [Member] | Education Lending [Member]	'	'
Loans [Line Items]	'	'
Loans	$4,500,000,000	$5,200,000,000

Loans_and_Loans_Held_for_Sale_3

Loans and Loans Held for Sale - Loans Held for Sale (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Millions, unless otherwise specified
Loans [Line Items]	'	'	'
Commercial, financial and agricultural	$278	$29	'
Commercial lease financing	9	8	'
Total loans held for sale	611	599	728
Commercial Mortgage [Member]	'	'	'
Loans [Line Items]	'	'	'
Real estate - commercial mortgage	307	477	'
Residential Mortgage [Member]	'	'	'
Loans [Line Items]	'	'	'
Real estate - commercial mortgage	$17	$85	'

Loans_and_Loans_Held_for_Sale_4

Loans and Loans Held for Sale - Summary of Changes in Loans Held for Sale (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Loans Receivables [Abstract]	'	'
Balance at beginning of the period	$599	$728
New originations	5,452	5,209
Transfers from held to maturity, net	52	77
Loan sales	-5,480	-5,391
Loan draws (payments), net	-12	-20
Transfers to OREO / valuation adjustments	'	-4
Balance at end of period	$611	$599

Loans_and_Loans_Held_for_Sale_5

Loans and Loans Held for Sale - Composition of Net Investment in Direct Financing Leases (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Statement Of Financial Position [Abstract]	'	'
Direct financing lease receivables	$3,176	$3,429
Unearned income	-219	-260
Unguaranteed residual value	231	261
Deferred fees and costs	21	25
Net investment in direct financing leases	$3,209	$3,455

Loans_and_Loans_Held_for_Sale_6

Loans and Loans Held for Sale - Additional Information (Detail) (USD $)	Dec. 31, 2013
Statement Of Financial Position [Abstract]	'
Minimum future lease payment to be received, 2014	$1,100,000,000
Minimum future lease payment to be received, 2015	853,000,000
Minimum future lease payment to be received, 2016	515,000,000
Minimum future lease payment to be received, 2017	287,000,000
Minimum future lease payment to be received, 2018	134,000,000
Minimum future lease payment to be received, subsequent years	173,000,000
Allowance related to lease financing receivables	$62,000,000

Asset_Quality_Nonperforming_As

Asset Quality - Nonperforming Assets and Past Due Loans (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Receivables [Abstract]	'	'
Total nonperforming loans	$508	$674
Nonperforming loans held for sale	1	25
OREO	15	22
Other nonperforming assets	7	14
Total nonperforming assets	531	735
Nonperforming assets from discontinued operations - education lending	25	20
Restructured loans included in nonperforming loans	214	249
Restructured loans with an allocated specific allowance	71	114
Specifically allocated allowance for restructured loans	35	33
Accruing loans past due 90 days or more	71	78
Accruing loans past due 30 through 89 days	$318	$424

Asset_Quality_Nonperforming_As1

Asset Quality - Nonperforming Assets and Past Due Loans (Parenthetical) (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2013
Receivables [Abstract]	'	'
Performing home equity second liens including nonperforming loans	$72	'
Purchased credit impaired loans	23	16
Restructured loans	$3	$13

Asset_Quality_Additional_Infor

Asset Quality - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
	SecurityLoan	SecurityLoan
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'
Estimated gross contractual amount receivable of PCI loans	$41,000,000	'	'	'
Estimated cash flows nonaccretable amount	11,000,000	'	'	'
Estimated cash flows accretable amount	5,000,000	'	'	'
Purchased Credit Impaired, Outstanding	16,000,000	23,000,000	'	'
Changes in the accretable yield, accretion	2,000,000	'	'	'
Changes in the accretable yield, net reclassifications	3,000,000	'	'	'
Accretable yield	5,000,000	'	'	'
Percentage of carrying amount of our commercial nonperforming loans outstanding	57.00%	'	'	'
Percentage of nonperforming loans outstanding face value	72.00%	'	'	'
Percentage of loans held for sale and other nonperforming assets	70.00%	'	'	'
Aggregate carrying amount of largest nonperforming loans	'	179,000,000	'	'
Number of largest nonperforming loans	20	20	'	'
Total loans on nonperforming status from continuing operations	86,000,000	'	'	'
Percentage of total loans on nonperforming status	17.00%	27.00%	'	'
Net reduction to interest income	23,000,000	25,000,000	'	'
Interest income recognized on outstanding balances	6,000,000	5,000,000	'	'
Total restructured loans	338,000,000	320,000,000	'	'
Addition in restructured loans	182,000,000	'	'	'
Restructured loans partially in payments and charge-offs	164,000,000	'	'	'
Total current loan	53,500,000,000	'	'	'
Percent of total current loan	98.30%	'	'	'
Total past due loan	897,000,000	1,176,000,000	'	'
Percent of total past due loans	1.70%	'	'	'
Minimum outstanding impaired commercial loans	2,500,000	'	'	'
Number of days to designate commercial loans will be charged off in full or charged down to the fair value of the underlying collateral payment due period	'180 days	'	'	'
Number of days to designate the charge-off policy for most consumer loans taking effect, payment due period	'120 days	'	'	'
Number of days to designate home equity and residential mortgage loans to get charged down to the fair value of the underlying collateral payment due period	'180 days	'	'	'
Number of days to designate the charge-off policy for credit card loans taking effect, payment due period	'180 days	'	'	'
ALLL	848,000,000	888,000,000	'	'
ALLL percentage	1.56%	1.68%	'	'
ALLL of nonperforming loans percentage	166.90%	131.80%	'	'
Increase (decrease) in allowance for loan losses	'	40,000,000	'	'
Percentage decrease in allowance for loan losses	'	5.00%	'	'
Individually evaluated for impairment, corresponding allowance	358,000,000	411,000,000	'	'
Corresponding allowance	42,000,000	35,000,000	'	'
Collectively Evaluated for Impairment, Outstanding	54,083,000,000	52,388,000,000	'	'
Collectively evaluated for current, corresponding allowance	805,000,000	'	'	'
Provision (credit) for loan and lease losses	130,000,000	229,000,000	-60,000,000	'
Increase (decrease) liability for credit losses on lending related commitments	'	8,000,000	'	'
Percentage of total allowance for credit losses	1.63%	1.74%	'	'
Liability for credit losses on lending-related commitments	37,000,000	29,000,000	45,000,000	73,000,000
Consumer Loans [Member]	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'
Purchased Credit Impaired, Outstanding	15,000,000	19,000,000	'	'
Number of loans	672	'	'	'
Financial receivable, modifications, subsequent default, recorded investment	31,000,000	'	'	'
Individually evaluated for impairment, corresponding allowance	231,000,000	202,000,000	'	'
Corresponding allowance	32,000,000	22,000,000	'	'
Collectively Evaluated for Impairment, Outstanding	15,884,000,000	15,721,000,000	'	'
PCI Loans [Member]	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'
Purchased Credit Impaired, Outstanding	24,000,000	'	'	'
Purchased credit impaired loans carrying value	16,000,000	'	'	'
Purchase Credit Impaired Loans [Member]	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'
Corresponding allowance	1,000,000	'	'	'
Collectively Evaluated for Impairment, Outstanding	16,000,000	'	'	'
Provision (credit) for loan and lease losses	$0	'	'	'

Asset_Quality_Breakdown_of_Ind

Asset Quality - Breakdown of Individually Impaired Loans (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Impaired [Line Items]	'	'
With no related allowance recorded, Recorded Investment	$201	$258
Recorded Investment	358	411
With no related allowance recorded, Unpaid Principal Balance	324	477
Unpaid Principal Balance	495	639
With no related allowance recorded, Specific Allowance	'	'
With no related allowance recorded, Average Recorded Investment	230	238
With related allowance recorded, Recorded Investment	157	153
With related allowance recorded, Unpaid Principal Balance	171	162
Specific Allowance	42	35
With related allowance recorded, Average Recorded Investment	155	162
Average Recorded Investment	385	400
Commercial, Financial and Agricultural [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
With no related allowance recorded, Recorded Investment	33	32
With no related allowance recorded, Unpaid Principal Balance	69	64
With no related allowance recorded, Specific Allowance	'	'
With no related allowance recorded, Average Recorded Investment	33	60
With related allowance recorded, Recorded Investment	17	33
With related allowance recorded, Unpaid Principal Balance	20	42
Specific Allowance	8	12
With related allowance recorded, Average Recorded Investment	25	48
Commercial Real Estate: Commercial Mortgage [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
With no related allowance recorded, Recorded Investment	21	89
With no related allowance recorded, Unpaid Principal Balance	25	142
With no related allowance recorded, Specific Allowance	'	'
With no related allowance recorded, Average Recorded Investment	55	95
With related allowance recorded, Recorded Investment	6	7
With related allowance recorded, Unpaid Principal Balance	6	7
Specific Allowance	2	1
With related allowance recorded, Average Recorded Investment	7	51
Commercial Real Estate: Construction [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
With no related allowance recorded, Recorded Investment	48	48
With no related allowance recorded, Unpaid Principal Balance	131	182
With no related allowance recorded, Specific Allowance	'	'
With no related allowance recorded, Average Recorded Investment	48	39
With related allowance recorded, Recorded Investment	2	'
With related allowance recorded, Unpaid Principal Balance	12	'
Specific Allowance	'	'
With related allowance recorded, Average Recorded Investment	1	6
Commercial Real Estate Loans [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
With no related allowance recorded, Recorded Investment	69	137
With no related allowance recorded, Unpaid Principal Balance	156	324
With no related allowance recorded, Specific Allowance	'	'
With no related allowance recorded, Average Recorded Investment	103	134
With related allowance recorded, Recorded Investment	8	7
With related allowance recorded, Unpaid Principal Balance	18	7
Specific Allowance	2	1
With related allowance recorded, Average Recorded Investment	8	57
Commercial Loans [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
With no related allowance recorded, Recorded Investment	102	169
With no related allowance recorded, Unpaid Principal Balance	225	388
With no related allowance recorded, Specific Allowance	'	'
With no related allowance recorded, Average Recorded Investment	136	194
With related allowance recorded, Recorded Investment	25	40
With related allowance recorded, Unpaid Principal Balance	38	49
Specific Allowance	10	13
With related allowance recorded, Average Recorded Investment	33	105
Real Estate - Residential Mortgage [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
With no related allowance recorded, Recorded Investment	27	21
With no related allowance recorded, Unpaid Principal Balance	27	21
With no related allowance recorded, Specific Allowance	'	'
With no related allowance recorded, Average Recorded Investment	24	10
With related allowance recorded, Recorded Investment	29	17
With related allowance recorded, Unpaid Principal Balance	29	17
Specific Allowance	9	1
With related allowance recorded, Average Recorded Investment	23	8
Home Equity: Key Community Bank [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
With no related allowance recorded, Recorded Investment	67	65
With no related allowance recorded, Unpaid Principal Balance	67	65
With no related allowance recorded, Specific Allowance	'	'
With no related allowance recorded, Average Recorded Investment	66	33
With related allowance recorded, Recorded Investment	35	22
With related allowance recorded, Unpaid Principal Balance	35	22
Specific Allowance	10	11
With related allowance recorded, Average Recorded Investment	29	11
Home Equity: Other [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
With no related allowance recorded, Recorded Investment	2	3
With no related allowance recorded, Unpaid Principal Balance	2	3
With no related allowance recorded, Specific Allowance	'	'
With no related allowance recorded, Average Recorded Investment	2	1
With related allowance recorded, Recorded Investment	10	9
With related allowance recorded, Unpaid Principal Balance	11	9
Specific Allowance	1	1
With related allowance recorded, Average Recorded Investment	9	5
Home Equity Loans [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
With no related allowance recorded, Recorded Investment	69	68
With no related allowance recorded, Unpaid Principal Balance	69	68
With no related allowance recorded, Specific Allowance	'	'
With no related allowance recorded, Average Recorded Investment	68	34
With related allowance recorded, Recorded Investment	45	31
With related allowance recorded, Unpaid Principal Balance	46	31
Specific Allowance	11	12
With related allowance recorded, Average Recorded Investment	38	16
Consumer Other - Key Community Bank [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
With related allowance recorded, Recorded Investment	3	2
With related allowance recorded, Unpaid Principal Balance	3	2
Specific Allowance	1	2
With related allowance recorded, Average Recorded Investment	2	1
Consumer Credit Card [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
With related allowance recorded, Recorded Investment	5	2
With related allowance recorded, Unpaid Principal Balance	5	2
Specific Allowance	1	'
With related allowance recorded, Average Recorded Investment	3	1
Consumer Marine [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
With no related allowance recorded, Recorded Investment	3	'
With no related allowance recorded, Unpaid Principal Balance	3	'
With no related allowance recorded, Specific Allowance	'	'
With no related allowance recorded, Average Recorded Investment	2	'
With related allowance recorded, Recorded Investment	49	60
With related allowance recorded, Unpaid Principal Balance	49	60
Specific Allowance	10	7
With related allowance recorded, Average Recorded Investment	55	30
Other Consumer [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
With related allowance recorded, Recorded Investment	1	1
With related allowance recorded, Unpaid Principal Balance	1	1
Specific Allowance	'	'
With related allowance recorded, Average Recorded Investment	1	1
Consumer Other [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
With no related allowance recorded, Recorded Investment	3	'
With no related allowance recorded, Unpaid Principal Balance	3	'
With no related allowance recorded, Specific Allowance	'	'
With no related allowance recorded, Average Recorded Investment	2	'
With related allowance recorded, Recorded Investment	50	61
With related allowance recorded, Unpaid Principal Balance	50	61
Specific Allowance	10	7
With related allowance recorded, Average Recorded Investment	56	31
Consumer Loans [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
With no related allowance recorded, Recorded Investment	99	89
With no related allowance recorded, Unpaid Principal Balance	99	89
With no related allowance recorded, Specific Allowance	'	'
With no related allowance recorded, Average Recorded Investment	94	44
With related allowance recorded, Recorded Investment	132	113
With related allowance recorded, Unpaid Principal Balance	133	113
Specific Allowance	32	22
With related allowance recorded, Average Recorded Investment	$122	$57

Asset_Quality_Breakdown_of_Non

Asset Quality - Breakdown of Nonperforming TDRs by Loans Category (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified	SecurityLoan	SecurityLoan
Financing Receivable, Modifications [Line Items]	'	'
Number of loans	4,893	3,657
Pre-modification Outstanding Recorded Investment	$443	$434
Post-modification Outstanding Recorded Investment	338	320
Nonperforming [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of loans	3,749	3,094
Pre-modification Outstanding Recorded Investment	304	350
Post-modification Outstanding Recorded Investment	214	249
Prior-Year Accruing [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of loans	1,144	563
Pre-modification Outstanding Recorded Investment	139	84
Post-modification Outstanding Recorded Investment	124	71
Commercial, Financial and Agricultural [Member] | Nonperforming [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of loans	33	82
Pre-modification Outstanding Recorded Investment	72	76
Post-modification Outstanding Recorded Investment	34	39
Commercial, Financial and Agricultural [Member] | Prior-Year Accruing [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of loans	50	122
Pre-modification Outstanding Recorded Investment	7	12
Post-modification Outstanding Recorded Investment	3	6
Commercial Real Estate: Commercial Mortgage [Member] | Nonperforming [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of loans	11	15
Pre-modification Outstanding Recorded Investment	41	62
Post-modification Outstanding Recorded Investment	14	25
Commercial Real Estate: Commercial Mortgage [Member] | Prior-Year Accruing [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of loans	4	4
Pre-modification Outstanding Recorded Investment	18	22
Post-modification Outstanding Recorded Investment	10	15
Commercial Real Estate: Construction [Member] | Nonperforming [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of loans	6	8
Pre-modification Outstanding Recorded Investment	19	53
Post-modification Outstanding Recorded Investment	4	33
Commercial Real Estate: Construction [Member] | Prior-Year Accruing [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of loans	1	'
Pre-modification Outstanding Recorded Investment	23	'
Post-modification Outstanding Recorded Investment	42	'
Commercial Real Estate Loans [Member] | Nonperforming [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of loans	17	23
Pre-modification Outstanding Recorded Investment	60	115
Post-modification Outstanding Recorded Investment	18	58
Commercial Real Estate Loans [Member] | Prior-Year Accruing [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of loans	5	4
Pre-modification Outstanding Recorded Investment	41	22
Post-modification Outstanding Recorded Investment	52	15
Commercial Loans [Member] | Nonperforming [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of loans	50	105
Pre-modification Outstanding Recorded Investment	132	191
Post-modification Outstanding Recorded Investment	52	97
Commercial Loans [Member] | Prior-Year Accruing [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of loans	55	126
Pre-modification Outstanding Recorded Investment	48	34
Post-modification Outstanding Recorded Investment	55	21
Real Estate - Residential Mortgage [Member] | Nonperforming [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of loans	676	372
Pre-modification Outstanding Recorded Investment	43	28
Post-modification Outstanding Recorded Investment	43	28
Real Estate - Residential Mortgage [Member] | Prior-Year Accruing [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of loans	119	101
Pre-modification Outstanding Recorded Investment	12	10
Post-modification Outstanding Recorded Investment	12	10
Home Equity: Key Community Bank [Member] | Nonperforming [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of loans	1,708	1,577
Pre-modification Outstanding Recorded Investment	91	87
Post-modification Outstanding Recorded Investment	86	82
Home Equity: Key Community Bank [Member] | Prior-Year Accruing [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of loans	161	76
Pre-modification Outstanding Recorded Investment	17	5
Post-modification Outstanding Recorded Investment	17	5
Home Equity: Other [Member] | Nonperforming [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of loans	227	322
Pre-modification Outstanding Recorded Investment	6	9
Post-modification Outstanding Recorded Investment	6	8
Home Equity: Other [Member] | Prior-Year Accruing [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of loans	212	84
Pre-modification Outstanding Recorded Investment	7	3
Post-modification Outstanding Recorded Investment	6	3
Home Equity Loans [Member] | Nonperforming [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of loans	1,935	1,899
Pre-modification Outstanding Recorded Investment	97	96
Post-modification Outstanding Recorded Investment	92	90
Home Equity Loans [Member] | Prior-Year Accruing [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of loans	373	160
Pre-modification Outstanding Recorded Investment	24	8
Post-modification Outstanding Recorded Investment	23	8
Consumer Other - Key Community Bank [Member] | Nonperforming [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of loans	49	28
Pre-modification Outstanding Recorded Investment	2	1
Post-modification Outstanding Recorded Investment	1	1
Consumer Other - Key Community Bank [Member] | Prior-Year Accruing [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of loans	31	16
Pre-modification Outstanding Recorded Investment	1	'
Post-modification Outstanding Recorded Investment	1	'
Credit Cards [Member] | Nonperforming [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of loans	629	405
Pre-modification Outstanding Recorded Investment	5	3
Post-modification Outstanding Recorded Investment	4	3
Credit Cards [Member] | Prior-Year Accruing [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of loans	240	'
Pre-modification Outstanding Recorded Investment	2	'
Post-modification Outstanding Recorded Investment	1	'
Consumer Marine [Member] | Nonperforming [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of loans	360	251
Pre-modification Outstanding Recorded Investment	24	30
Post-modification Outstanding Recorded Investment	21	29
Consumer Marine [Member] | Prior-Year Accruing [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of loans	272	117
Pre-modification Outstanding Recorded Investment	51	31
Post-modification Outstanding Recorded Investment	31	31
Other Consumer [Member] | Nonperforming [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of loans	50	34
Pre-modification Outstanding Recorded Investment	1	1
Post-modification Outstanding Recorded Investment	1	1
Other Consumer [Member] | Prior-Year Accruing [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of loans	54	43
Pre-modification Outstanding Recorded Investment	1	1
Post-modification Outstanding Recorded Investment	1	1
Consumer Other [Member] | Nonperforming [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of loans	410	285
Pre-modification Outstanding Recorded Investment	25	31
Post-modification Outstanding Recorded Investment	22	30
Consumer Other [Member] | Prior-Year Accruing [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of loans	326	160
Pre-modification Outstanding Recorded Investment	52	32
Post-modification Outstanding Recorded Investment	32	32
Consumer Loans [Member] | Nonperforming [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of loans	3,699	2,989
Pre-modification Outstanding Recorded Investment	172	159
Post-modification Outstanding Recorded Investment	162	152
Consumer Loans [Member] | Prior-Year Accruing [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of loans	1,089	437
Pre-modification Outstanding Recorded Investment	91	50
Post-modification Outstanding Recorded Investment	$69	$50

Asset_Quality_Concession_Types

Asset Quality - Concession Types for our Commercial Accruing and Nonaccruing TDRs (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Noncancelable Obligations Future Minimum Payments Due [Line Items]	'	'
Total commercial and consumer TDRs	$338	$320
Total loans	54,457	52,822
Commercial Loans [Member]	'	'
Noncancelable Obligations Future Minimum Payments Due [Line Items]	'	'
Interest rate reduction	95	104
Forgiveness of principal	5	7
Other modification of loan terms	7	7
Total	107	118
Total loans	38,327	36,880
Consumer Loans [Member]	'	'
Noncancelable Obligations Future Minimum Payments Due [Line Items]	'	'
Interest rate reduction	130	122
Forgiveness of principal	5	6
Other modification of loan terms	96	74
Total	231	202
Total loans	$16,130	$15,942

Asset_Quality_Concession_Types1

Asset Quality - Concession Types for our Commercial Accruing and Nonaccruing TDRs (Parenthetical) (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Receivables [Abstract]	'	'
Additional funds to borrowers related to lending related commitments	$15	$32

Asset_Quality_Past_Due_Loans_I

Asset Quality - Past Due Loans Including Current Loans (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	$53,544	$51,623
30 - 59 Days Past Due	213	286
60 - 89 Days Past Due	105	138
90 and Greater Days Past Due	71	78
Nonperforming Loans	508	674
Total Past Due and Nonperforming Loans	897	1,176
Purchased Credit Impaired	16	23
Total Loans	54,457	52,822
Commercial, Financial and Agricultural [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	24,823	23,030
30 - 59 Days Past Due	39	56
60 - 89 Days Past Due	8	34
90 and Greater Days Past Due	16	22
Nonperforming Loans	77	99
Total Past Due and Nonperforming Loans	140	211
Purchased Credit Impaired	'	1
Total Loans	24,963	23,242
Commercial Real Estate: Commercial Mortgage [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	7,638	7,556
30 - 59 Days Past Due	20	21
60 - 89 Days Past Due	7	11
90 and Greater Days Past Due	17	9
Nonperforming Loans	37	120
Total Past Due and Nonperforming Loans	81	161
Purchased Credit Impaired	1	3
Total Loans	7,720	7,720
Construction [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	1,068	943
30 - 59 Days Past Due	10	1
60 - 89 Days Past Due	'	2
90 and Greater Days Past Due	1	1
Nonperforming Loans	14	56
Total Past Due and Nonperforming Loans	25	60
Purchased Credit Impaired	'	'
Total Loans	1,093	1,003
Commercial Real Estate Loans [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	8,706	8,499
30 - 59 Days Past Due	30	22
60 - 89 Days Past Due	7	13
90 and Greater Days Past Due	18	10
Nonperforming Loans	51	176
Total Past Due and Nonperforming Loans	106	221
Purchased Credit Impaired	1	3
Total Loans	8,813	8,723
Commercial Lease Financing [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	4,463	4,772
30 - 59 Days Past Due	32	88
60 - 89 Days Past Due	33	31
90 and Greater Days Past Due	4	8
Nonperforming Loans	19	16
Total Past Due and Nonperforming Loans	88	143
Purchased Credit Impaired	'	'
Total Loans	4,551	4,915
Commercial Loans [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	37,992	36,301
30 - 59 Days Past Due	101	166
60 - 89 Days Past Due	48	78
90 and Greater Days Past Due	38	40
Nonperforming Loans	147	291
Total Past Due and Nonperforming Loans	334	575
Purchased Credit Impaired	1	4
Total Loans	38,327	36,880
Real Estate - Residential Mortgage [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	2,038	2,023
30 - 59 Days Past Due	19	16
60 - 89 Days Past Due	5	10
90 and Greater Days Past Due	4	6
Nonperforming Loans	107	103
Total Past Due and Nonperforming Loans	135	135
Purchased Credit Impaired	14	16
Total Loans	2,187	2,174
Home Equity: Key Community Bank [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	10,038	9,506
30 - 59 Days Past Due	51	54
60 - 89 Days Past Due	31	26
90 and Greater Days Past Due	14	17
Nonperforming Loans	205	210
Total Past Due and Nonperforming Loans	301	307
Purchased Credit Impaired	1	3
Total Loans	10,340	9,816
Home Equity: Other [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	308	387
30 - 59 Days Past Due	6	9
60 - 89 Days Past Due	4	4
90 and Greater Days Past Due	1	2
Nonperforming Loans	15	21
Total Past Due and Nonperforming Loans	26	36
Purchased Credit Impaired	'	'
Total Loans	334	423
Home Equity Loans [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	10,346	9,893
30 - 59 Days Past Due	57	63
60 - 89 Days Past Due	35	30
90 and Greater Days Past Due	15	19
Nonperforming Loans	220	231
Total Past Due and Nonperforming Loans	327	343
Purchased Credit Impaired	1	3
Total Loans	10,674	10,239
Consumer Other - Key Community Bank [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	1,426	1,325
30 - 59 Days Past Due	8	9
60 - 89 Days Past Due	5	5
90 and Greater Days Past Due	7	8
Nonperforming Loans	3	2
Total Past Due and Nonperforming Loans	23	24
Purchased Credit Impaired	'	'
Total Loans	1,449	1,349
Credit Cards [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	698	706
30 - 59 Days Past Due	11	7
60 - 89 Days Past Due	5	5
90 and Greater Days Past Due	4	'
Nonperforming Loans	4	11
Total Past Due and Nonperforming Loans	24	23
Purchased Credit Impaired	'	'
Total Loans	722	729
Consumer Marine [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	979	1,288
30 - 59 Days Past Due	15	23
60 - 89 Days Past Due	6	9
90 and Greater Days Past Due	2	4
Nonperforming Loans	26	34
Total Past Due and Nonperforming Loans	49	70
Purchased Credit Impaired	'	'
Total Loans	1,028	1,358
Consumer Others [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	65	87
30 - 59 Days Past Due	2	2
60 - 89 Days Past Due	1	1
90 and Greater Days Past Due	1	1
Nonperforming Loans	1	2
Total Past Due and Nonperforming Loans	5	6
Purchased Credit Impaired	'	'
Total Loans	70	93
Consumer Other [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	1,044	1,375
30 - 59 Days Past Due	17	25
60 - 89 Days Past Due	7	10
90 and Greater Days Past Due	3	5
Nonperforming Loans	27	36
Total Past Due and Nonperforming Loans	54	76
Purchased Credit Impaired	'	'
Total Loans	1,098	1,451
Consumer Loans [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	15,552	15,322
30 - 59 Days Past Due	112	120
60 - 89 Days Past Due	57	60
90 and Greater Days Past Due	33	38
Nonperforming Loans	361	383
Total Past Due and Nonperforming Loans	563	601
Purchased Credit Impaired	15	19
Total Loans	$16,130	$15,942

Asset_Quality_Past_Due_Loans_I1

Asset Quality - Past Due Loans Including Current Loans (Parenthetical) (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2012
Receivables [Abstract]	'
Performing home equity second liens including nonperforming loans	$72

Asset_Quality_Financing_Receiv

Asset Quality - Financing Receivable Credit Quality Indicators (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Commercial, Financial and Agricultural [Member] | AAA-AA [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total Loans	$402	$200
Commercial, Financial and Agricultural [Member] | A [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total Loans	882	607
Commercial, Financial and Agricultural [Member] | BBB-BB [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total Loans	22,368	20,834
Commercial, Financial and Agricultural [Member] | B [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total Loans	521	787
Commercial, Financial and Agricultural [Member] | CCC-C [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total Loans	790	813
Commercial, Financial and Agricultural [Member] | Commercial [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total Loans	24,963	23,241
RE Commercial [Member] | AAA-AA [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total Loans	2	1
RE Commercial [Member] | A [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total Loans	56	77
RE Commercial [Member] | BBB-BB [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total Loans	7,129	6,549
RE Commercial [Member] | B [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total Loans	282	456
RE Commercial [Member] | CCC-C [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total Loans	250	634
RE Commercial [Member] | Commercial [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total Loans	7,719	7,717
RE Construction [Member] | AAA-AA [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total Loans	1	1
RE Construction [Member] | A [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total Loans	1	1
RE Construction [Member] | BBB-BB [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total Loans	920	783
RE Construction [Member] | B [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total Loans	32	20
RE Construction [Member] | CCC-C [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total Loans	139	198
RE Construction [Member] | Commercial [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total Loans	1,093	1,003
Commercial Lease Financing [Member] | AAA-AA [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total Loans	656	554
Commercial Lease Financing [Member] | A [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total Loans	631	978
Commercial Lease Financing [Member] | BBB-BB [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total Loans	3,080	3,118
Commercial Lease Financing [Member] | B [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total Loans	117	175
Commercial Lease Financing [Member] | CCC-C [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total Loans	67	90
Commercial Lease Financing [Member] | Commercial [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total Loans	4,551	4,915
Commercial Loans [Member] | AAA-AA [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total Loans	1,061	756
Commercial Loans [Member] | A [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total Loans	1,570	1,663
Commercial Loans [Member] | BBB-BB [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total Loans	33,497	31,284
Commercial Loans [Member] | B [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total Loans	952	1,438
Commercial Loans [Member] | CCC-C [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total Loans	1,246	1,735
Commercial Loans [Member] | Commercial [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total Loans	$38,326	$36,876

Asset_Quality_Credit_Risk_Prof

Asset Quality - Credit Risk Profile by Regulatory Classifications (Detail) (Residential - Prime, Financing Receivable [Member], USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	$12,846	$12,394
Pass [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	12,500	12,035
Substandard [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	$346	$359

Asset_Quality_Credit_Risk_Prof1

Asset Quality - Credit Risk Profile Based on Payment Activity (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Consumer Other - Key Community Bank [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Credit risk profile based on payment	$1,449	$1,349
Consumer Other - Key Community Bank [Member] | Performing [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Credit risk profile based on payment	1,446	1,347
Consumer Other - Key Community Bank [Member] | Nonperforming [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Credit risk profile based on payment	3	2
Credit Cards [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Credit risk profile based on payment	722	729
Credit Cards [Member] | Performing [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Credit risk profile based on payment	718	718
Credit Cards [Member] | Nonperforming [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Credit risk profile based on payment	4	11
Consumer Marine [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Credit risk profile based on payment	1,028	1,358
Consumer Marine [Member] | Performing [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Credit risk profile based on payment	1,002	1,324
Consumer Marine [Member] | Nonperforming [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Credit risk profile based on payment	26	34
Consumer Others [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Credit risk profile based on payment	70	93
Consumer Others [Member] | Performing [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Credit risk profile based on payment	69	91
Consumer Others [Member] | Nonperforming [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Credit risk profile based on payment	1	2
Consumer Loans [Member] | Credit Risk Profile [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Credit risk profile based on payment	3,269	3,529
Consumer Loans [Member] | Credit Risk Profile [Member] | Performing [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Credit risk profile based on payment	3,235	3,480
Consumer Loans [Member] | Credit Risk Profile [Member] | Nonperforming [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Credit risk profile based on payment	$34	$49

Asset_Quality_Allowance_for_Lo

Asset Quality - Allowance for Loan and Lease Losses (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Receivables [Abstract]	'	'	'
Balance at beginning of period - continuing operations	$888	$1,004	$1,604
Charge-offs	-308	-508	-715
Recoveries	140	163	174
Net loans and leases charged off	-168	-345	-541
Provision for loan and lease losses from continuing operations	130	229	-60
Foreign currency translation adjustment	-2	'	1
Balance at end of period - continuing operations	$848	$888	$1,004

Asset_Quality_Changes_in_Allow

Asset Quality - Changes in Allowance for Loan and Lease Losses by Loan Category (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'
Balance at beginning of period - continuing operations	$888	$1,004	$1,604
Provision	128	229	-59
Charge-offs	-308	-508	-715
Recoveries	140	163	174
Balance at end of period - continuing operations	848	888	1,004
Discontinued Operations, Beginning Balance	55	104	114
Provision, Discontinued Operations	21	9	113
Charge-offs, Discontinued Operations	-55	-75	-138
Recoveries, Discontinued Operations	18	17	15
Discontinued Operations, Ending Balance	39	55	104
Financing Receivable Allowance For Credit Losses Total ALLL Including Discontinued Operations, Beginning Balance	943	1,108	1,718
Provisions, Total ALLL - Including Discontinued Operations	149	238	54
Charge-offs, Total ALLL - Including Discontinued Operations	-363	-583	-853
Recoveries, Total ALLL - Including Discontinued Operations	158	180	189
Financing Receivable Allowance For Credit Losses Total ALLL Including Discontinued Operations, Ending Balance	887	943	1,108
Commercial, Financial and Agricultural [Member]	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'
Balance at beginning of period - continuing operations	327	334	485
Provision	58	10	-32
Charge-offs	-62	-80	-169
Recoveries	39	63	50
Balance at end of period - continuing operations	362	327	334
Commercial Real Estate: Commercial Mortgage [Member]	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'
Balance at beginning of period - continuing operations	198	272	416
Provision	-40	5	-41
Charge-offs	-20	-102	-113
Recoveries	27	23	10
Balance at end of period - continuing operations	165	198	272
Commercial Real Estate Construction Financing Receivable [Member]	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'
Balance at beginning of period - continuing operations	41	63	145
Provision	-20	-3	-26
Charge-offs	-3	-24	-83
Recoveries	14	5	27
Balance at end of period - continuing operations	32	41	63
Commercial Lease Financing [Member]	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'
Balance at beginning of period - continuing operations	55	78	175
Provision	19	-18	-80
Charge-offs	-27	-27	-42
Recoveries	15	22	25
Balance at end of period - continuing operations	62	55	78
Commercial [Member]	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'
Balance at beginning of period - continuing operations	621	747	1,221
Provision	17	-6	-179
Charge-offs	-112	-233	-407
Recoveries	95	113	112
Balance at end of period - continuing operations	621	621	747
Real Estate - Residential Mortgage [Member]	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'
Balance at beginning of period - continuing operations	30	37	49
Provision	25	17	14
Charge-offs	-20	-27	-29
Recoveries	2	3	3
Balance at end of period - continuing operations	37	30	37
Home Equity: Key Community Bank [Member]	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'
Balance at beginning of period - continuing operations	105	103	120
Provision	31	90	72
Charge-offs	-62	-99	-100
Recoveries	10	11	11
Balance at end of period - continuing operations	84	105	103
Home Equity: Other [Member]	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'
Balance at beginning of period - continuing operations	25	29	57
Provision	'	26	13
Charge-offs	-20	-35	-45
Recoveries	6	5	4
Balance at end of period - continuing operations	11	25	29
Home Equity [Member]	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'
Balance at beginning of period - continuing operations	130	132	177
Provision	31	116	85
Charge-offs	-82	-134	-145
Recoveries	16	16	15
Balance at end of period - continuing operations	95	130	132
Consumer Other - Key Community Bank [Member]	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'
Balance at beginning of period - continuing operations	38	41	57
Provision	15	29	21
Charge-offs	-31	-38	-45
Recoveries	7	6	8
Balance at end of period - continuing operations	29	38	41
Credit Cards [Member]	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'
Balance at beginning of period - continuing operations	26	'	'
Provision	35	37	'
Charge-offs	-30	-11	'
Recoveries	3	'	'
Balance at end of period - continuing operations	34	26	'
Consumer Marine [Member]	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'
Balance at beginning of period - continuing operations	39	46	89
Provision	4	30	5
Charge-offs	-29	-59	-80
Recoveries	15	22	32
Balance at end of period - continuing operations	29	39	46
Consumer Others [Member]	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'
Balance at beginning of period - continuing operations	4	1	11
Provision	1	6	-5
Charge-offs	-4	-6	-9
Recoveries	2	3	4
Balance at end of period - continuing operations	3	4	1
Consumer Other - Key Corporate Bank [Member]	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'
Balance at beginning of period - continuing operations	43	47	100
Provision	5	36	'
Charge-offs	-33	-65	-89
Recoveries	17	25	36
Balance at end of period - continuing operations	32	43	47
Consumer Loans [Member]	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'
Balance at beginning of period - continuing operations	267	257	383
Provision	111	235	120
Charge-offs	-196	-275	-308
Recoveries	45	50	62
Balance at end of period - continuing operations	$227	$267	$257

Asset_Quality_Changes_in_Allow1

Asset Quality - Changes in Allowance for Loan and Lease Losses by Loan Category (Parenthetical) (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2011
Receivables [Abstract]	'	'
Foreign currency translation adjustment	$2	$1

Asset_Quality_Allowance_for_Lo1

Asset Quality - Allowance for Loan and Lease Losses and Corresponding Loan Balances (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Individually Evaluated for Impairment Allowance	$42	$35
Collectively Evaluated for Impairment Allowance	805	852
Purchased Credit Impaired Allowance	1	1
Total Loans	54,457	52,822
Individually Evaluated for Impairment, Outstanding	358	411
Collectively Evaluated for Impairment, Outstanding	54,083	52,388
Purchased Credit Impaired, Outstanding	16	23
Individually Evaluated for Impairment Allowance, Discontinued Operations	1	'
Collectively Evaluated for Impairment Allowance, Discontinued Operations	38	55
Purchase Credit Impairment Allowance, Discontinued Operations	'	'
Loans Outstanding, Discontinued Operations	4,497	5,201
Individually Evaluated for Impairment Outstanding, Discontinued Operations	13	3
Collectively Evaluated for Impairment Outstanding, Discontinued Operations	4,484	5,198
Purchase Credit Impairment Outstanding, Discontinued Operations	'	'
Individually Evaluated for Impairment Allowance, Total ALLL - Including Discontinued Operations	43	35
Collectively Evaluated for Impairment Allowance, Total ALLL - Including Discontinued Operations	843	907
Purchased Credit Impaired Allowance, Total ALLL - Including Discontinued Operations	1	1
Loans Outstanding, Total ALLL - Including Discontinued Operations	58,954	58,023
Individually Evaluated for Impairment Outstanding, Total ALLL - Including Discontinued Operations	371	414
Collectively Evaluated for Impairment Outstanding, Total ALLL - Including Discontinued Operations	58,567	57,586
Purchased Credit Impaired Outstanding, Total ALLL - Including Discontinued Operations	16	23
Commercial, Financial and Agricultural [Member]	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Individually Evaluated for Impairment Allowance	8	12
Collectively Evaluated for Impairment Allowance	354	314
Purchased Credit Impaired Allowance	'	'
Total Loans	24,963	23,242
Individually Evaluated for Impairment, Outstanding	50	65
Collectively Evaluated for Impairment, Outstanding	24,913	23,176
Purchased Credit Impaired, Outstanding	'	1
Commercial Real Estate: Commercial Mortgage [Member]	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Individually Evaluated for Impairment Allowance	2	1
Collectively Evaluated for Impairment Allowance	163	198
Purchased Credit Impaired Allowance	'	'
Total Loans	7,720	7,720
Individually Evaluated for Impairment, Outstanding	27	96
Collectively Evaluated for Impairment, Outstanding	7,692	7,621
Purchased Credit Impaired, Outstanding	1	3
Commercial Real Estate: Construction [Member]	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Individually Evaluated for Impairment Allowance	'	'
Collectively Evaluated for Impairment Allowance	32	41
Purchased Credit Impaired Allowance	'	'
Total Loans	1,093	1,003
Individually Evaluated for Impairment, Outstanding	50	48
Collectively Evaluated for Impairment, Outstanding	1,043	955
Purchased Credit Impaired, Outstanding	'	'
Commercial Real Estate Loans [Member]	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Individually Evaluated for Impairment Allowance	2	1
Collectively Evaluated for Impairment Allowance	195	239
Purchased Credit Impaired Allowance	'	'
Total Loans	8,813	8,723
Individually Evaluated for Impairment, Outstanding	77	144
Collectively Evaluated for Impairment, Outstanding	8,735	8,576
Purchased Credit Impaired, Outstanding	1	3
Commercial Lease Financing [Member]	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Individually Evaluated for Impairment Allowance	'	'
Collectively Evaluated for Impairment Allowance	62	55
Purchased Credit Impaired Allowance	'	'
Total Loans	4,551	4,915
Individually Evaluated for Impairment, Outstanding	'	'
Collectively Evaluated for Impairment, Outstanding	4,551	4,915
Purchased Credit Impaired, Outstanding	'	'
Commercial [Member]	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Individually Evaluated for Impairment Allowance	10	13
Collectively Evaluated for Impairment Allowance	611	608
Purchased Credit Impaired Allowance	'	'
Total Loans	38,327	36,880
Individually Evaluated for Impairment, Outstanding	127	209
Collectively Evaluated for Impairment, Outstanding	38,199	36,667
Purchased Credit Impaired, Outstanding	1	4
Real Estate - Residential Mortgage [Member]	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Individually Evaluated for Impairment Allowance	9	1
Collectively Evaluated for Impairment Allowance	27	29
Purchased Credit Impaired Allowance	1	1
Total Loans	2,187	2,174
Individually Evaluated for Impairment, Outstanding	56	38
Collectively Evaluated for Impairment, Outstanding	2,117	2,120
Purchased Credit Impaired, Outstanding	14	16
Home Equity: Key Community Bank [Member]	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Individually Evaluated for Impairment Allowance	10	11
Collectively Evaluated for Impairment Allowance	74	94
Purchased Credit Impaired Allowance	'	'
Total Loans	10,340	9,816
Individually Evaluated for Impairment, Outstanding	102	87
Collectively Evaluated for Impairment, Outstanding	10,237	9,726
Purchased Credit Impaired, Outstanding	1	3
Home Equity: Other [Member]	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Individually Evaluated for Impairment Allowance	1	1
Collectively Evaluated for Impairment Allowance	10	24
Purchased Credit Impaired Allowance	'	'
Total Loans	334	423
Individually Evaluated for Impairment, Outstanding	12	12
Collectively Evaluated for Impairment, Outstanding	322	411
Purchased Credit Impaired, Outstanding	'	'
Home Equity [Member]	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Individually Evaluated for Impairment Allowance	11	12
Collectively Evaluated for Impairment Allowance	84	118
Purchased Credit Impaired Allowance	'	'
Total Loans	10,674	10,239
Individually Evaluated for Impairment, Outstanding	114	99
Collectively Evaluated for Impairment, Outstanding	10,559	10,137
Purchased Credit Impaired, Outstanding	1	3
Consumer Other - Key Community Bank [Member]	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Individually Evaluated for Impairment Allowance	1	2
Collectively Evaluated for Impairment Allowance	28	36
Purchased Credit Impaired Allowance	'	'
Total Loans	1,449	1,349
Individually Evaluated for Impairment, Outstanding	3	2
Collectively Evaluated for Impairment, Outstanding	1,446	1,347
Purchased Credit Impaired, Outstanding	'	'
Credit Cards [Member]	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Individually Evaluated for Impairment Allowance	1	'
Collectively Evaluated for Impairment Allowance	33	26
Purchased Credit Impaired Allowance	'	'
Total Loans	722	729
Individually Evaluated for Impairment, Outstanding	5	2
Collectively Evaluated for Impairment, Outstanding	717	727
Purchased Credit Impaired, Outstanding	'	'
Consumer Marine [Member]	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Individually Evaluated for Impairment Allowance	10	7
Collectively Evaluated for Impairment Allowance	19	32
Purchased Credit Impaired Allowance	'	'
Total Loans	1,028	1,358
Individually Evaluated for Impairment, Outstanding	52	60
Collectively Evaluated for Impairment, Outstanding	976	1,298
Purchased Credit Impaired, Outstanding	'	'
Consumer Others [Member]	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Individually Evaluated for Impairment Allowance	'	'
Collectively Evaluated for Impairment Allowance	3	3
Purchased Credit Impaired Allowance	'	'
Total Loans	70	93
Individually Evaluated for Impairment, Outstanding	1	1
Collectively Evaluated for Impairment, Outstanding	69	92
Purchased Credit Impaired, Outstanding	'	'
Consumer Other [Member]	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Individually Evaluated for Impairment Allowance	10	7
Collectively Evaluated for Impairment Allowance	22	35
Purchased Credit Impaired Allowance	'	'
Total Loans	1,098	1,451
Individually Evaluated for Impairment, Outstanding	53	61
Collectively Evaluated for Impairment, Outstanding	1,045	1,390
Purchased Credit Impaired, Outstanding	'	'
Consumer Loans [Member]	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Individually Evaluated for Impairment Allowance	32	22
Collectively Evaluated for Impairment Allowance	194	244
Purchased Credit Impaired Allowance	1	1
Total Loans	16,130	15,942
Individually Evaluated for Impairment, Outstanding	231	202
Collectively Evaluated for Impairment, Outstanding	15,884	15,721
Purchased Credit Impaired, Outstanding	$15	$19

Asset_Quality_Allowance_for_Lo2

Asset Quality - Allowance for Loan and Lease Losses and Corresponding Loan Balances (Parenthetical) (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Billions, unless otherwise specified
Receivables [Abstract]	'	'
Loans carried at fair value	$2.10	$2.50

Asset_Quality_Changes_in_Liabi

Asset Quality - Changes in Liability for Credit Losses on Lending Related Commitments (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Receivables [Abstract]	'	'	'
Balance at beginning of period	$29	$45	$73
Provision (credit) for losses on lending-related commitments	8	-16	-28
Balance at end of period	$37	$29	$45

Fair_Value_Measurements_Fair_V

Fair Value Measurements - Fair Values of Funds and Unfunded Commitments for Funds (Detail) (Private Equity and Mezzanine Investments [Member], USD $)	Dec. 31, 2013
In Millions, unless otherwise specified
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]	'
Fair Value	$23
Unfunded Commitments	1
Passive Funds [Member]	'
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]	'
Fair Value	11
Unfunded Commitments	1
Co-Managed Funds [Member]	'
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]	'
Fair Value	12
Unfunded Commitments	'

Fair_Value_Measurements_Fair_V1

Fair Value Measurements - Fair Values of Funds and Unfunded Commitments for Funds (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2013
Minimum [Member] | Passive Funds [Member]	'
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]	'
Liquidation period of funds	'1 year
Minimum [Member] | Co-Managed Funds [Member]	'
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]	'
Liquidation period of funds	'1 year
Maximum [Member] | Passive Funds [Member]	'
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]	'
Liquidation period of funds	'5 years
Maximum [Member] | Co-Managed Funds [Member]	'
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]	'
Liquidation period of funds	'4 years

Fair_Value_Measurements_Additi

Fair Value Measurements - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Unfunded commitments	$75,000,000	'
Investment liquidation minimum period	'1 year	'
Investment liquidation maximum period	'9 years	'
Commercial loan held-for-sale	'	9,000,000
Fair value of OREO property re-evaluated period	'90 days	'
Loan, net of allowance	53,609,000,000	51,934,000,000
Loans in portfolio	147,000,000	147,000,000
Average maturity of short-term financial instruments	'Less than six months	'
Segment, Discontinued Operations [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Loan, net of allowance	4,458,000,000	5,146,000,000
Segment, Discontinued Operations [Member] | Education Lending [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Loan, net of allowance	4,458,000,000	5,146,000,000
Residential Real Estate Mortgage Loans [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Loan, net of allowance	2,200,000,000	2,200,000,000
Fair Value [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Commercial loan held-for-sale	611,000,000	599,000,000
Fair Value [Member] | Segment, Discontinued Operations [Member] | Education Lending [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Loan, net of allowance	2,000,000,000	2,300,000,000
Loans in portfolio	147,000,000	157,000,000
Loans in the trusts	2,000,000,000	2,400,000,000
Securities issued by the education lending securitization trusts	1,800,000,000	2,200,000,000
Carrying Amount [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Commercial loan held-for-sale	611,000,000	599,000,000
Carrying Amount [Member] | Segment, Discontinued Operations [Member] | Education Lending [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Loan, net of allowance	2,400,000,000	2,600,000,000
Level 3 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Commercial loan held-for-sale	'	9,000,000
Level 3 [Member] | Fair Value [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Commercial loan held-for-sale	611,000,000	599,000,000
Principal Investments Indirect [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Total other investments	413,000,000	'
Commercial Loans [Member] | Level 3 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Commercial loan held-for-sale	$0	$9,000,000

Fair_Value_Measurements_Fair_V2

Fair Value Measurements - Fair Value of Assets and Liabilities Measured on Recurring Basis (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total derivative assets	$407	$693
Accrued income and other assets	14	22
Total assets at fair value	30	56
LIABILITIES MEASURED ON A RECURRING BASIS	'	'
Federal funds purchased and securities sold under repurchase agreements	1,534	1,609
Principal Investments Indirect [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total other investments	413	'
Recurring [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Securities purchased under resale agreements	347	271
Commercial loans	3	9
Total trading account assets	738	605
Securities available for sale	12,346	12,094
Total other investments	577	668
Derivative assets	1,219	1,963
Netting adjustments	-812	-1,270
Total derivative assets	407	693
Accrued income and other assets	56	3
Total assets at fair value	14,471	14,334
LIABILITIES MEASURED ON A RECURRING BASIS	'	'
Federal funds purchased and securities sold under repurchase agreements	517	228
Short positions	343	287
Derivative liabilities	914	1,387
Netting adjustments	-500	-803
Total derivative liabilities	414	584
Accrued expense and other liabilities	1	49
Total liabilities on a recurring basis at fair value	1,275	1,148
Recurring [Member] | U.S. Treasury, Agencies and Corporations [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total trading account securities	471	383
Recurring [Member] | States and Political Subdivisions [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total trading account securities	23	24
Securities available for sale	40	49
Recurring [Member] | Collateralized Mortgage Obligations [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total trading account securities	9	8
Securities available for sale	11,000	11,464
Recurring [Member] | Other Mortgage-Backed Securities [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total trading account securities	120	4
Securities available for sale	1,286	538
Recurring [Member] | Other Securities [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total trading account securities	112	177
Securities available for sale	20	43
Recurring [Member] | Total Trading Account Securities [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total trading account securities	735	596
Recurring [Member] | Principal Investments Direct [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total other investments	141	191
Recurring [Member] | Principal Investments Indirect [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total other investments	413	436
Recurring [Member] | Principal Investments [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total other investments	554	627
Recurring [Member] | Equity and Mezzanine Investments Direct [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total other investments	'	'
Recurring [Member] | Equity and Mezzanine Investments Indirect [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total other investments	23	41
Recurring [Member] | Private Equity and Mezzanine Investments [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total other investments	23	41
Recurring [Member] | Interest Rate [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Derivative assets	1,039	1,724
LIABILITIES MEASURED ON A RECURRING BASIS	'	'
Derivative liabilities	739	1,152
Recurring [Member] | Foreign Exchange [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Derivative assets	63	75
LIABILITIES MEASURED ON A RECURRING BASIS	'	'
Derivative liabilities	57	75
Recurring [Member] | Commodity [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Derivative assets	112	156
LIABILITIES MEASURED ON A RECURRING BASIS	'	'
Derivative liabilities	106	150
Recurring [Member] | Credit [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Derivative assets	5	8
LIABILITIES MEASURED ON A RECURRING BASIS	'	'
Derivative liabilities	12	10
Recurring [Member] | Equity [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Derivative assets	'	'
LIABILITIES MEASURED ON A RECURRING BASIS	'	'
Derivative liabilities	'	'
Level 1 [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Accrued income and other assets	'	'
Total assets at fair value	'	'
Level 1 [Member] | Recurring [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Securities purchased under resale agreements	'	'
Commercial loans	'	'
Total trading account assets	4	2
Securities available for sale	20	43
Total other investments	'	'
Derivative assets	56	54
Netting adjustments	'	'
Total derivative assets	56	54
Accrued income and other assets	1	'
Total assets at fair value	81	99
LIABILITIES MEASURED ON A RECURRING BASIS	'	'
Federal funds purchased and securities sold under repurchase agreements	'	'
Short positions	2	'
Derivative liabilities	49	55
Netting adjustments	'	'
Total derivative liabilities	49	55
Accrued expense and other liabilities	'	'
Total liabilities on a recurring basis at fair value	51	55
Level 1 [Member] | Recurring [Member] | U.S. Treasury, Agencies and Corporations [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total trading account securities	'	'
Level 1 [Member] | Recurring [Member] | States and Political Subdivisions [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total trading account securities	'	'
Securities available for sale	'	'
Level 1 [Member] | Recurring [Member] | Collateralized Mortgage Obligations [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total trading account securities	'	'
Securities available for sale	'	'
Level 1 [Member] | Recurring [Member] | Other Mortgage-Backed Securities [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total trading account securities	'	'
Securities available for sale	'	'
Level 1 [Member] | Recurring [Member] | Other Securities [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total trading account securities	4	2
Securities available for sale	20	43
Level 1 [Member] | Recurring [Member] | Total Trading Account Securities [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total trading account securities	4	2
Level 1 [Member] | Recurring [Member] | Principal Investments Direct [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total other investments	'	'
Level 1 [Member] | Recurring [Member] | Principal Investments Indirect [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total other investments	'	'
Level 1 [Member] | Recurring [Member] | Principal Investments [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total other investments	'	'
Level 1 [Member] | Recurring [Member] | Equity and Mezzanine Investments Direct [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total other investments	'	'
Level 1 [Member] | Recurring [Member] | Equity and Mezzanine Investments Indirect [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total other investments	'	'
Level 1 [Member] | Recurring [Member] | Private Equity and Mezzanine Investments [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total other investments	'	'
Level 1 [Member] | Recurring [Member] | Interest Rate [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Derivative assets	'	'
LIABILITIES MEASURED ON A RECURRING BASIS	'	'
Derivative liabilities	'	'
Level 1 [Member] | Recurring [Member] | Foreign Exchange [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Derivative assets	56	54
LIABILITIES MEASURED ON A RECURRING BASIS	'	'
Derivative liabilities	49	55
Level 1 [Member] | Recurring [Member] | Commodity [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Derivative assets	'	'
LIABILITIES MEASURED ON A RECURRING BASIS	'	'
Derivative liabilities	'	'
Level 1 [Member] | Recurring [Member] | Credit [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Derivative assets	'	'
LIABILITIES MEASURED ON A RECURRING BASIS	'	'
Derivative liabilities	'	'
Level 1 [Member] | Recurring [Member] | Equity [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Derivative assets	'	'
LIABILITIES MEASURED ON A RECURRING BASIS	'	'
Derivative liabilities	'	'
Level 2 [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Accrued income and other assets	'	2
Total assets at fair value	'	2
Level 2 [Member] | Recurring [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Securities purchased under resale agreements	347	271
Commercial loans	3	9
Total trading account assets	734	600
Securities available for sale	12,326	12,051
Total other investments	'	'
Derivative assets	1,134	1,883
Netting adjustments	'	'
Total derivative assets	1,134	1,883
Accrued income and other assets	55	3
Total assets at fair value	14,596	14,808
LIABILITIES MEASURED ON A RECURRING BASIS	'	'
Federal funds purchased and securities sold under repurchase agreements	517	228
Short positions	341	287
Derivative liabilities	864	1,330
Netting adjustments	'	'
Total derivative liabilities	864	1,330
Accrued expense and other liabilities	1	49
Total liabilities on a recurring basis at fair value	1,723	1,894
Level 2 [Member] | Recurring [Member] | U.S. Treasury, Agencies and Corporations [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total trading account securities	471	383
Level 2 [Member] | Recurring [Member] | States and Political Subdivisions [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total trading account securities	23	21
Securities available for sale	40	49
Level 2 [Member] | Recurring [Member] | Collateralized Mortgage Obligations [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total trading account securities	9	8
Securities available for sale	11,000	11,464
Level 2 [Member] | Recurring [Member] | Other Mortgage-Backed Securities [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total trading account securities	120	4
Securities available for sale	1,286	538
Level 2 [Member] | Recurring [Member] | Other Securities [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total trading account securities	108	175
Securities available for sale	'	'
Level 2 [Member] | Recurring [Member] | Total Trading Account Securities [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total trading account securities	731	591
Level 2 [Member] | Recurring [Member] | Principal Investments Direct [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total other investments	'	'
Level 2 [Member] | Recurring [Member] | Principal Investments Indirect [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total other investments	'	'
Level 2 [Member] | Recurring [Member] | Principal Investments [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total other investments	'	'
Level 2 [Member] | Recurring [Member] | Equity and Mezzanine Investments Direct [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total other investments	'	'
Level 2 [Member] | Recurring [Member] | Equity and Mezzanine Investments Indirect [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total other investments	'	'
Level 2 [Member] | Recurring [Member] | Private Equity and Mezzanine Investments [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total other investments	'	'
Level 2 [Member] | Recurring [Member] | Interest Rate [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Derivative assets	1,014	1,705
LIABILITIES MEASURED ON A RECURRING BASIS	'	'
Derivative liabilities	739	1,152
Level 2 [Member] | Recurring [Member] | Foreign Exchange [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Derivative assets	7	21
LIABILITIES MEASURED ON A RECURRING BASIS	'	'
Derivative liabilities	8	20
Level 2 [Member] | Recurring [Member] | Commodity [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Derivative assets	112	154
LIABILITIES MEASURED ON A RECURRING BASIS	'	'
Derivative liabilities	106	149
Level 2 [Member] | Recurring [Member] | Credit [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Derivative assets	1	3
LIABILITIES MEASURED ON A RECURRING BASIS	'	'
Derivative liabilities	11	9
Level 2 [Member] | Recurring [Member] | Equity [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Derivative assets	'	'
LIABILITIES MEASURED ON A RECURRING BASIS	'	'
Derivative liabilities	'	'
Level 3 [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Accrued income and other assets	14	20
Total assets at fair value	30	54
Level 3 [Member] | Recurring [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Securities purchased under resale agreements	'	'
Commercial loans	'	'
Total trading account assets	'	3
Securities available for sale	'	'
Total other investments	577	668
Derivative assets	29	26
Netting adjustments	'	'
Total derivative assets	29	26
Accrued income and other assets	'	'
Total assets at fair value	606	697
LIABILITIES MEASURED ON A RECURRING BASIS	'	'
Federal funds purchased and securities sold under repurchase agreements	'	'
Short positions	'	'
Derivative liabilities	1	2
Netting adjustments	'	'
Total derivative liabilities	1	2
Accrued expense and other liabilities	'	'
Total liabilities on a recurring basis at fair value	1	2
Level 3 [Member] | Recurring [Member] | U.S. Treasury, Agencies and Corporations [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total trading account securities	'	'
Level 3 [Member] | Recurring [Member] | States and Political Subdivisions [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total trading account securities	'	3
Securities available for sale	'	'
Level 3 [Member] | Recurring [Member] | Collateralized Mortgage Obligations [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total trading account securities	'	'
Securities available for sale	'	'
Level 3 [Member] | Recurring [Member] | Other Mortgage-Backed Securities [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total trading account securities	'	'
Securities available for sale	'	'
Level 3 [Member] | Recurring [Member] | Other Securities [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total trading account securities	'	'
Securities available for sale	'	'
Level 3 [Member] | Recurring [Member] | Total Trading Account Securities [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total trading account securities	'	3
Level 3 [Member] | Recurring [Member] | Principal Investments Direct [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total other investments	141	191
Level 3 [Member] | Recurring [Member] | Principal Investments Indirect [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total other investments	413	436
Level 3 [Member] | Recurring [Member] | Principal Investments [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total other investments	554	627
Level 3 [Member] | Recurring [Member] | Equity and Mezzanine Investments Direct [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total other investments	'	'
Level 3 [Member] | Recurring [Member] | Equity and Mezzanine Investments Indirect [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total other investments	23	41
Level 3 [Member] | Recurring [Member] | Private Equity and Mezzanine Investments [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total other investments	23	41
Level 3 [Member] | Recurring [Member] | Interest Rate [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Derivative assets	25	19
LIABILITIES MEASURED ON A RECURRING BASIS	'	'
Derivative liabilities	'	'
Level 3 [Member] | Recurring [Member] | Foreign Exchange [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Derivative assets	'	'
LIABILITIES MEASURED ON A RECURRING BASIS	'	'
Derivative liabilities	'	'
Level 3 [Member] | Recurring [Member] | Commodity [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Derivative assets	'	2
LIABILITIES MEASURED ON A RECURRING BASIS	'	'
Derivative liabilities	'	1
Level 3 [Member] | Recurring [Member] | Credit [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Derivative assets	4	5
LIABILITIES MEASURED ON A RECURRING BASIS	'	'
Derivative liabilities	1	1
Level 3 [Member] | Recurring [Member] | Equity [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Derivative assets	'	'
LIABILITIES MEASURED ON A RECURRING BASIS	'	'
Derivative liabilities	'	'

Fair_Value_Measurements_Change

Fair Value Measurements - Change in Fair Values of Level 3 Financial Instruments (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Trading Account Assets [Member] | Other Mortgage-Backed Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items]	'	'
Beginning Balance	'	$35
Gains (Losses) Included in Earnings	4	1
Purchases	'	'
Sales	-4	-32
Settlements	'	'
Transfers into Level 3	'	'
Transfers out of Level 3	'	-4
Ending Balance	'	'
Unrealized Gains (Losses) Included in Earnings	'	'
Trading Account Assets [Member] | Other Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items]	'	'
Gains (Losses) Included in Earnings	4	'
Settlements	-4	'
Unrealized Gains (Losses) Included in Earnings	-1	'
Trading Account Assets [Member] | States and Political Subdivisions [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items]	'	'
Beginning Balance	3	'
Gains (Losses) Included in Earnings	'	3
Purchases	'	'
Sales	-3	-7
Settlements	'	-50
Transfers into Level 3	'	57
Transfers out of Level 3	'	'
Ending Balance	'	3
Unrealized Gains (Losses) Included in Earnings	'	4
Other Investments [Member] | Principal Investments Direct [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items]	'	'
Beginning Balance	191	225
Gains (Losses) Included in Earnings	-11	11
Purchases	8	12
Sales	-47	-57
Settlements	'	'
Transfers into Level 3	'	'
Transfers out of Level 3	'	'
Ending Balance	141	191
Unrealized Gains (Losses) Included in Earnings	-23	14
Other Investments [Member] | Principal Investments Indirect [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items]	'	'
Beginning Balance	436	473
Gains (Losses) Included in Earnings	58	52
Purchases	23	34
Sales	-104	-123
Settlements	'	'
Transfers into Level 3	'	'
Transfers out of Level 3	'	'
Ending Balance	413	436
Unrealized Gains (Losses) Included in Earnings	18	5
Other Investments [Member] | Equity and Mezzanine Investments Direct [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items]	'	'
Beginning Balance	'	15
Gains (Losses) Included in Earnings	'	2
Purchases	'	'
Sales	'	'
Settlements	'	-17
Transfers into Level 3	'	'
Transfers out of Level 3	'	'
Ending Balance	'	'
Unrealized Gains (Losses) Included in Earnings	8	10
Other Investments [Member] | Equity and Mezzanine Investments Indirect [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items]	'	'
Beginning Balance	41	36
Gains (Losses) Included in Earnings	2	8
Purchases	'	4
Sales	'	'
Settlements	-20	-7
Transfers into Level 3	'	'
Transfers out of Level 3	'	'
Ending Balance	23	41
Unrealized Gains (Losses) Included in Earnings	2	8
Interest Rate [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items]	'	'
Beginning Balance	19	38
Gains (Losses) Included in Earnings	-10	-5
Purchases	1	2
Sales	-2	-7
Settlements	'	'
Transfers into Level 3	46	8
Transfers out of Level 3	-29	-17
Ending Balance	25	19
Unrealized Gains (Losses) Included in Earnings	'	'
Commodity [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items]	'	'
Beginning Balance	1	-1
Gains (Losses) Included in Earnings	-1	1
Purchases	'	-1
Sales	'	'
Settlements	'	'
Transfers into Level 3	'	2
Transfers out of Level 3	'	'
Ending Balance	'	1
Unrealized Gains (Losses) Included in Earnings	'	'
Credit [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items]	'	'
Beginning Balance	4	-21
Gains (Losses) Included in Earnings	-8	-13
Purchases	'	'
Sales	'	'
Settlements	7	38
Transfers into Level 3	'	'
Transfers out of Level 3	'	'
Ending Balance	3	4
Unrealized Gains (Losses) Included in Earnings	'	'

Fair_Value_Measurements_Assets

Fair Value Measurements - Assets Measured at Fair Value on Nonrecurring Basis (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
ASSETS MEASURED ON A NONRECURRING BASIS	'	'
Impaired loans	$16	$25
Loans held for sale	'	9
Accrued income and other assets	14	22
Total assets at fair value	30	56
Level 1 [Member]	'	'
ASSETS MEASURED ON A NONRECURRING BASIS	'	'
Impaired loans	'	'
Loans held for sale	'	'
Accrued income and other assets	'	'
Total assets at fair value	'	'
Level 2 [Member]	'	'
ASSETS MEASURED ON A NONRECURRING BASIS	'	'
Impaired loans	'	'
Loans held for sale	'	'
Accrued income and other assets	'	2
Total assets at fair value	'	2
Level 3 [Member]	'	'
ASSETS MEASURED ON A NONRECURRING BASIS	'	'
Impaired loans	16	25
Loans held for sale	'	9
Accrued income and other assets	14	20
Total assets at fair value	$30	$54

Fair_Value_Measurements_Assets1

Fair Value Measurements - Assets Measured at Fair Value on Nonrecurring Basis (Parenthetical) (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Fair Value Disclosures [Abstract]	'	'
Transfer of commercial and consumer loans from held-for-sale to held-to-maturity, current fair value	$9	$17

Fair_Value_Measurements_Quanti

Fair Value Measurements - Quantitative Information about Level 3 Fair Value Measurements (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Other investments	969	1,064
Impaired loans	16	25
Level 3 [Member]	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Impaired loans	16	25
Level 3 [Member] | Recurring [Member]	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Other investments	141	191
Level 3 [Member] | Nonrecurring [Member]	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Impaired loans	16	25
Goodwill	979	979
Level 3 [Member] | EBITDA Multiple [Member] | Recurring [Member]	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Percentage of significant unobservable input weighted-average	6.10%	5.90%
Level 3 [Member] | EBITDA Multiple [Member] | Recurring [Member] | Minimum [Member]	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Percentage of significant unobservable input weighted-average	6.70%	5.50%
Level 3 [Member] | EBITDA Multiple [Member] | Recurring [Member] | Maximum [Member]	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Percentage of significant unobservable input weighted-average	7.00%	6.00%
Level 3 [Member] | EBITDA Multiple (Where Applicable) [Member] | Recurring [Member]	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Percentage of significant unobservable input weighted-average	6.20%	6.10%
Level 3 [Member] | EBITDA Multiple (Where Applicable) [Member] | Recurring [Member] | Minimum [Member]	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Percentage of significant unobservable input weighted-average	4.80%	5.00%
Level 3 [Member] | EBITDA Multiple (Where Applicable) [Member] | Recurring [Member] | Maximum [Member]	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Percentage of significant unobservable input weighted-average	10.40%	8.50%
Level 3 [Member] | Revenue Multiple (Where Applicable) [Member] | Recurring [Member]	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Percentage of significant unobservable input weighted-average	4.00%	4.80%
Level 3 [Member] | Revenue Multiple (Where Applicable) [Member] | Recurring [Member] | Minimum [Member]	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Percentage of significant unobservable input weighted-average	1.10%	0.30%
Level 3 [Member] | Revenue Multiple (Where Applicable) [Member] | Recurring [Member] | Maximum [Member]	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Percentage of significant unobservable input weighted-average	4.70%	5.70%
Level 3 [Member] | Discount [Member] | Nonrecurring [Member]	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Percentage of significant unobservable input weighted-average	36.00%	45.00%
Level 3 [Member] | Discount [Member] | Nonrecurring [Member] | Minimum [Member]	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Percentage of significant unobservable input weighted-average	10.00%	0.00%
Level 3 [Member] | Discount [Member] | Nonrecurring [Member] | Maximum [Member]	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Percentage of significant unobservable input weighted-average	100.00%	100.00%
Level 3 [Member] | Earnings Multiple of Peers [Member] | Nonrecurring [Member]	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Significant unobservable input weighted-average	11.59	11.25
Level 3 [Member] | Earnings Multiple of Peers [Member] | Nonrecurring [Member] | Minimum [Member]	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Significant unobservable input weighted-average	10.1	9.7
Level 3 [Member] | Earnings Multiple of Peers [Member] | Nonrecurring [Member] | Maximum [Member]	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Significant unobservable input weighted-average	14.4	14.2
Level 3 [Member] | Equity Multiple of Peers [Member] | Nonrecurring [Member]	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Significant unobservable input weighted-average	1.24	1.09
Level 3 [Member] | Equity Multiple of Peers [Member] | Nonrecurring [Member] | Minimum [Member]	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Significant unobservable input weighted-average	1.17	0.95
Level 3 [Member] | Equity Multiple of Peers [Member] | Nonrecurring [Member] | Maximum [Member]	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Significant unobservable input weighted-average	1.29	1.17
Level 3 [Member] | Control Premium [Member] | Nonrecurring [Member]	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Percentage of significant unobservable input weighted-average	35.00%	30.00%
Level 3 [Member] | Weighted-average Cost of Capital [Member] | Nonrecurring [Member]	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Percentage of significant unobservable input weighted-average	13.00%	13.00%
Level 3 [Member] | Other Investments [Member] | Recurring [Member]	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Fair value measurement, valuation technique	'Individual analysis of the condition of each investment	'Individual analysis of the condition of each investment
Level 3 [Member] | Impaired Loans [Member] | Nonrecurring [Member]	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Fair value measurement, valuation technique	'Fair value of underlying collateral	'Fair value of underlying collateral
Level 3 [Member] | Goodwill [Member] | Nonrecurring [Member]	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Fair value measurement, valuation technique	'Discounted cash flow and market data	'Discounted cash flow and market data

Fair_Value_Measurements_Fair_V3

Fair Value Measurements - Fair Value Disclosures of Financial Instruments (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Millions, unless otherwise specified
ASSETS	'	'	'
Other investments	$969	$1,064	'
Loans, net of allowance	147	157	'
Loans held for sale	'	9	'
Derivative assets	407	693	'
LIABILITIES	'	'	'
Short-term borrowings	343	287	337
Derivative liabilities	414	584	'
Level 1 [Member]	'	'	'
ASSETS	'	'	'
Loans held for sale	'	'	'
Level 2 [Member]	'	'	'
ASSETS	'	'	'
Loans held for sale	'	'	'
Level 3 [Member]	'	'	'
ASSETS	'	'	'
Loans held for sale	'	9	'
Carrying Amount [Member]	'	'	'
ASSETS	'	'	'
Cash and short-term investments	6,207	4,525	'
Trading account assets	738	605	'
Securities available for sale	12,346	12,094	'
Held-to-maturity securities	4,756	3,931	'
Other investments	969	1,064	'
Loans, net of allowance	53,609	51,934	'
Loans held for sale	611	599	'
Mortgage servicing assets	332	204	'
Derivative assets	407	693	'
LIABILITIES	'	'	'
Deposits with no stated maturity	62,425	58,132	'
Time deposits	6,837	7,861	'
Short-term borrowings	1,877	1,896	'
Long-term debt	7,650	6,847	'
Derivative liabilities	414	584	'
Fair Value [Member]	'	'	'
ASSETS	'	'	'
Cash and short-term investments	6,207	4,525	'
Trading account assets	738	605	'
Securities available for sale	12,346	12,094	'
Held-to-maturity securities	4,617	3,992	'
Other investments	969	1,064	'
Loans, net of allowance	52,102	51,046	'
Loans held for sale	611	599	'
Mortgage servicing assets	386	238	'
Derivative assets	407	693	'
LIABILITIES	'	'	'
Deposits with no stated maturity	62,425	58,132	'
Time deposits	6,926	8,020	'
Short-term borrowings	1,877	1,896	'
Long-term debt	8,008	7,392	'
Derivative liabilities	414	584	'
Fair Value [Member] | Level 1 [Member]	'	'	'
ASSETS	'	'	'
Cash and short-term investments	5,860	4,254	'
Trading account assets	4	2	'
Securities available for sale	20	43	'
Held-to-maturity securities	'	'	'
Other investments	'	'	'
Loans, net of allowance	'	'	'
Loans held for sale	'	'	'
Mortgage servicing assets	'	'	'
Derivative assets	56	54	'
LIABILITIES	'	'	'
Deposits with no stated maturity	'	'	'
Time deposits	558	408	'
Short-term borrowings	2	'	'
Long-term debt	7,611	2,807	'
Derivative liabilities	49	54	'
Fair Value [Member] | Level 2 [Member]	'	'	'
ASSETS	'	'	'
Cash and short-term investments	347	271	'
Trading account assets	734	600	'
Securities available for sale	12,326	12,051	'
Held-to-maturity securities	4,617	3,992	'
Other investments	392	396	'
Loans, net of allowance	'	'	'
Loans held for sale	'	'	'
Mortgage servicing assets	'	'	'
Derivative assets	1,134	1,883	'
LIABILITIES	'	'	'
Deposits with no stated maturity	62,425	58,132	'
Time deposits	6,368	7,612	'
Short-term borrowings	1,875	1,896	'
Long-term debt	397	4,585	'
Derivative liabilities	864	1,331	'
Fair Value [Member] | Level 3 [Member]	'	'	'
ASSETS	'	'	'
Cash and short-term investments	'	'	'
Trading account assets	'	3	'
Securities available for sale	'	'	'
Held-to-maturity securities	'	'	'
Other investments	577	668	'
Loans, net of allowance	52,102	51,046	'
Loans held for sale	611	599	'
Mortgage servicing assets	386	238	'
Derivative assets	29	26	'
LIABILITIES	'	'	'
Deposits with no stated maturity	'	'	'
Time deposits	'	'	'
Short-term borrowings	'	'	'
Long-term debt	'	'	'
Derivative liabilities	1	2	'
Fair Value [Member] | Netting Adjustment [Member]	'	'	'
ASSETS	'	'	'
Cash and short-term investments	'	'	'
Trading account assets	'	'	'
Securities available for sale	'	'	'
Held-to-maturity securities	'	'	'
Other investments	'	'	'
Loans, net of allowance	'	'	'
Loans held for sale	'	'	'
Mortgage servicing assets	'	'	'
Derivative assets	-812	-1,270	'
LIABILITIES	'	'	'
Deposits with no stated maturity	'	'	'
Time deposits	'	'	'
Short-term borrowings	'	'	'
Long-term debt	'	'	'
Derivative liabilities	($500)	($803)	'

Securities_Details_of_Securiti

Securities - Details of Securities (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	$12,446	$11,728
Gross Unrealized Gains	183	366
Gross Unrealized Losses	283	'
Fair Value	12,346	12,094
Held to maturities, Amortized Cost	4,756	3,931
Held to maturities, Gross Unrealized Gains	6	61
Held to maturities, Gross Unrealized Losses	145	'
Held to maturities, Fair Value	4,617	3,992
States and Political Subdivisions [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	39	47
Gross Unrealized Gains	1	2
Gross Unrealized Losses	'	'
Fair Value	40	49
Collateralized Mortgage Obligations [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	11,120	11,148
Gross Unrealized Gains	152	316
Gross Unrealized Losses	272	'
Fair Value	11,000	11,464
Held to maturities, Amortized Cost	4,736	3,913
Held to maturities, Gross Unrealized Gains	6	61
Held to maturities, Gross Unrealized Losses	145	'
Held to maturities, Fair Value	4,597	3,974
Other Mortgage-Backed Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	1,270	491
Gross Unrealized Gains	27	47
Gross Unrealized Losses	11	'
Fair Value	1,286	538
Other Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	17	42
Gross Unrealized Gains	3	1
Gross Unrealized Losses	'	'
Fair Value	20	43
Held to maturities, Amortized Cost	20	18
Held to maturities, Gross Unrealized Gains	'	'
Held to maturities, Gross Unrealized Losses	'	'
Held to maturities, Fair Value	$20	$18

Securities_Available_for_Sale_

Securities - Available for Sale Securities (Unrealized Loss Position) (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'	'
Fair value less than 12 months, total temporarily impaired securities	$9,951	$31
Gross unrealized losses less than 12 months, total temporarily impaired securities	417	'
Fair value 12 months or longer, total temporarily impaired securities	157	3
Gross unrealized losses 12 months or longer, total temporarily impaired securities	11	'
Fair value, total temporarily impaired securities	10,108	34
Gross unrealized losses, total temporarily impaired securities	428	'
Collateralized Mortgage Obligations [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Fair value, less than 12 months	5,122	'
Gross unrealized losses, less than 12 months	261	'
Fair value, 12 months or longer	157	'
Gross unrealized losses, 12 months or longer	11	'
Fair Value	5,279	'
Gross unrealized losses, Total	272	'
Held-to-maturity Securities, Fair Value less than 12 months	3,969	'
Held-to-maturity Securities, Gross unrealized losses, less than 12 months	145	'
Held-to-maturity Securities, Fair Value 12 months or longer	'	'
Held-to-maturity Securities, Gross unrealized losses, 12 months or longer	'	'
Held-to-maturity Securities, Fair Value	3,969	'
Held-to-maturity Securities, Gross unrealized losses	145	'
Other Mortgage-Backed Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Fair value, less than 12 months	856	'
Gross unrealized losses, less than 12 months	11	'
Fair Value	856	'
Gross unrealized losses, Total	11	'
Other Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Fair value, less than 12 months	2	31
Fair value, 12 months or longer	'	3
Fair Value	2	34
Other Securities, Held-to-Maturity [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Held-to-maturity Securities, Fair Value less than 12 months	2	'
Held-to-maturity Securities, Fair Value 12 months or longer	'	'
Held-to-maturity Securities, Gross unrealized losses, 12 months or longer	'	'
Held-to-maturity Securities, Fair Value	$2	'

Securities_Available_for_Sale_1

Securities - Available for Sale Securities (Unrealized Loss Position) (Parenthetical) (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified		Maximum [Member]
Schedule of Available-for-sale Securities [Line Items]	'	'
Gross unrealized losses	$428	$1
Gross unrealized losses less than 12 months	$417	$1

Securities_Additional_Informat

Securities - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013
	MortgageLoan
Schedule of Available-for-sale Securities [Line Items]	'
Gross unrealized loss attributable to collateralized mortgage obligations	$272,000,000
Number of fixed rate collateralized mortgage obligations	60
Weighted-average maturity collateralized mortgage, in years	'5 years 1 month 6 days
Weighted-average maturity mortgage-backed securities, in years	'3 years 9 months 18 days
Pledged available for sale and held-to-maturity securities	11,100,000,000
Other Mortgage-Backed Securities [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Gross unrealized loss attributable to mortgage-backed securities	$11,000,000
Number of other mortgage-backed securities positions	32

Securities_Cumulative_Credit_P

Securities - Cumulative Credit Portion of Impairments on Debt Securities (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013
Investments Debt And Equity Securities [Abstract]	'
Cumulative Impairments on Debt Securities, Beginning Balance	$4
Impairment recognized in earnings	'
Cumulative Impairments on Debt Securities, Ending Balance	$4

Securities_Available_for_Sale_2

Securities - Available for Sale Securities Realized Gains and Losses (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2011
Investments Debt And Equity Securities [Abstract]	'	'
Realized gains	$1	$23
Realized losses	'	22
Net securities gains (losses)	$1	$1

Securities_Available_for_Sale_3

Securities - Available for Sale Securities Realized Gains and Losses (Parenthetical) (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2013
		Maximum [Member]
Schedule of Available-for-sale Securities [Line Items]	'	'
Realized losses	$22	$1

Securities_Securities_by_Matur

Securities - Securities by Maturity (Detail) (USD $)	Dec. 31, 2013
In Millions, unless otherwise specified
Investments Debt And Equity Securities [Abstract]	'
Amortized Cost of Securities Available for sale, Due in one year or less	$457
Amortized Cost of Securities Available for sale, Due after one through five years	11,550
Amortized Cost of Securities Available for sale, Due after five through ten years	435
Amortized Cost of Securities Available for sale, Due after ten years	4
Total Amortized Cost of Securities Available for sale	12,446
Fair Value of Securities Available for sale, Due in one year or less	466
Fair Value of Securities Available for sale, Due after one through five years	11,462
Fair Value of Securities Available for sale, Due after five through ten years	414
Fair Value of Securities Available for sale, Due after ten years	4
Total Fair Value of Securities Available for sale	12,346
Amortized Cost of Held-to-Maturity Securities, Due in one year or less	7
Amortized Cost of Held-to-Maturity Securities, Due after one through five years	4,605
Amortized Cost of Held-to-Maturity Securities, Due after five through ten years	144
Amortized Cost of Held-to-Maturity Securities, Due after ten years	'
Total Amortized Cost of Held-to-Maturity securities	4,756
Fair Value of Held-to-Maturity Securities, Due in one year or less	6
Fair Value of Held-to-Maturity Securities, Due after one through five years	4,475
Fair Value of Held-to-Maturity Securities, Due after five through ten years	136
Fair Value of Held-to-Maturity Securities, Due after ten years	'
Total Fair Value of Held-to-Maturity Securities	$4,617

Derivatives_and_Hedging_Activi2

Derivatives and Hedging Activities - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Credit Derivatives [Line Items]	'	'
Derivative assets after effects of bilateral collateral and master netting agreements	$91	'
Derivative assets not designated as hedging instruments after effects of bilateral collateral and master netting agreements, and a reserve for potential future losses	316	'
Derivative liabilities not designated as hedging instruments after effects of bilateral collateral and master netting agreements, and a reserve for potential future losses	421	'
Reclassify of net losses on derivative instruments from AOCI	22	'
Length of time hedge in cash flow hedge	'12 months	'
Reclassification of net gains related to terminated cash flow hedges from AOCI to income	5	'
Maximum length of time over which forecasted transactions are hedged, years	'15 years	'
Cash collateral netted against derivative assets	308	494
Collateral netted against derivative liabilities	4	27
Cash collateral not netted transferred with clearing organization	25	'
Gross exposure on derivatives, after taking into account the effects of bilateral collateral and master netting agreements	534	'
Net exposure on derivatives, after taking into account, the effects of bilateral collateral and master netting agreements	99	'
Over-collateralization on derivatives to broker-dealers and banks, after the application of master netting agreements and collateral	1	'
Additional collateral held in the form of securities	100	'
Default reserve associated with uncollateralized contracts	14	19
Gross exposure on derivatives after taking into account effects of master netting agreements	358	'
Net exposure on derivatives with clients after application of master netting agreements collateral and related reserve	308	'
Net liability position totaled	106	191
Cash and securities collateral posted	42	66
Maximum [Member]	'	'
Credit Derivatives [Line Items]	'	'
Derivative liabilities after effects of bilateral collateral and master netting agreements	7	'
Other Comprehensive income unrealized gain on derivatives arising during period net of tax	1	'
KeyBank (consolidated) [Member]	'	'
Credit Derivatives [Line Items]	'	'
Net liability position totaled	298	'
Derivative assets included in net liability position	315	'
Derivative liabilities included in net liability position	613	'
Cash and securities collateral posted	304	'
Payments to terminate contracts	13	'
Key Corp [Member]	'	'
Credit Derivatives [Line Items]	'	'
Cash and securities collateral posted	0	'
Additional collateral amount	1	3
Payments to terminate contracts	1	'
Key Corp [Member] | Maximum [Member]	'	'
Credit Derivatives [Line Items]	'	'
Net liability position totaled	$1	'

Derivatives_and_Hedging_Activi3

Derivatives and Hedging Activities - Fair Values, Volume of Activity and Gain (Loss) Information Related to Derivative Instruments (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Derivatives, Fair Value [Line Items]	'	'
Notional Amount	$68,077	$78,589
Derivative Assets	335	530
Derivative Liabilities	127	109
Derivative Instruments, Netting adjustments	'	'
Derivative Asset, Netting adjustments	-812	-1,270
Derivative Liability, Netting adjustments	-500	-803
Derivatives Designated as Hedging Instruments [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Notional Amount	14,677	19,281
Derivative assets	310	579
Derivative liabilities	38	37
Derivatives Not Designated as Hedging Instruments [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Notional Amount	53,400	59,308
Derivative assets	909	1,384
Derivative liabilities	876	1,350
Net Derivatives [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Notional Amount	68,077	78,589
Derivative Assets	407	693
Derivative Liabilities	414	584
Other Collateral [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Notional Amount	'	'
Derivative Assets	-72	-163
Derivative Liabilities	-287	-475
Interest Rate [Member] | Derivatives Designated as Hedging Instruments [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Notional Amount	14,487	19,085
Derivative assets	306	579
Derivative liabilities	37	30
Interest Rate [Member] | Derivatives Not Designated as Hedging Instruments [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Notional Amount	46,173	51,633
Derivative assets	733	1,144
Derivative liabilities	702	1,122
Foreign Exchange [Member] | Derivatives Designated as Hedging Instruments [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Notional Amount	190	196
Derivative assets	4	'
Derivative liabilities	1	7
Foreign Exchange [Member] | Derivatives Not Designated as Hedging Instruments [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Notional Amount	4,701	5,025
Derivative assets	59	75
Derivative liabilities	56	68
Commodity [Member] | Derivatives Not Designated as Hedging Instruments [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Notional Amount	1,616	1,688
Derivative assets	112	156
Derivative liabilities	106	150
Credit [Member] | Derivatives Not Designated as Hedging Instruments [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Notional Amount	910	955
Derivative assets	5	9
Derivative liabilities	12	10
Equity [Member] | Derivatives Not Designated as Hedging Instruments [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Notional Amount	'	7
Derivative assets	'	'
Derivative liabilities	'	'

Derivatives_and_Hedging_Activi4

Derivatives and Hedging Activities - Pre-Tax Net Gains (Losses) on Fair Value Hedges (Detail) (Fair Value Hedges [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]	'	'
Net Gains (Losses) on Derivative	($93)	$109
Net Gains (Losses) on Hedged Item	222	38
Other Income [Member] | Interest Rate [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Net Gains (Losses) on Derivative	-222	-52
Net Gains (Losses) on Hedged Item	222	45
Other Income [Member] | Foreign Exchange [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Net Gains (Losses) on Derivative	'	5
Net Gains (Losses) on Hedged Item	'	-6
Interest Expense [Member] | Interest Rate [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Net Gains (Losses) on Derivative	129	155
Interest Expense [Member] | Foreign Exchange [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Net Gains (Losses) on Derivative	'	1
Net Gains (Losses) on Hedged Item	'	($1)

Derivatives_and_Hedging_Activi5

Derivatives and Hedging Activities - Derivative Instrument Cash Flow Hedge Earning Recognized by Income Statement Location (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]	'	'
Net Gains (Losses) Recognized in OCI (Effective Portion)	$10	$85
Net Gains (Losses) Reclassified From OCI Into Income (Effective Portion)	56	56
Net Gains (Losses) Recognized in Income (Ineffective Portion)	'	'
Other Income [Member] | Interest Rate [Member] | Cash Flow Hedges [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Net Gains (Losses) Recognized in Income (Ineffective Portion)	'	'
Other Income [Member] | Foreign Exchange [Member] | Net Investment Hedges [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Net Gains (Losses) Recognized in OCI (Effective Portion)	9	-14
Net Gains (Losses) Reclassified From OCI Into Income (Effective Portion)	-3	'
Net Gains (Losses) Recognized in Income (Ineffective Portion)	'	'
Interest Income [Member] | Interest Rate [Member] | Cash Flow Hedges [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Net Gains (Losses) Recognized in OCI (Effective Portion)	-19	105
Net Gains (Losses) Reclassified From OCI Into Income (Effective Portion)	67	66
Interest Expense [Member] | Interest Rate [Member] | Cash Flow Hedges [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Net Gains (Losses) Recognized in OCI (Effective Portion)	20	-6
Net Gains (Losses) Reclassified From OCI Into Income (Effective Portion)	-8	-10
Investment Banking and Debt Placement Fee [Member] | Interest Rate [Member] | Cash Flow Hedges [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Net Gains (Losses) Recognized in OCI (Effective Portion)	'	'
Net Gains (Losses) Reclassified From OCI Into Income (Effective Portion)	'	'

Derivatives_and_Hedging_Activi6

Derivatives and Hedging Activities - After-Tax Change in AOCI Resulting from Cash Flow Hedges (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013
Derivative Instruments And Hedging Activities Disclosure [Abstract]	'
31-Dec-12	$18
2013 Hedging Activity	6
Reclassification of Gains to Net Income	-35
31-Dec-13	($11)

Derivatives_and_Hedging_Activi7

Derivatives and Hedging Activities - Pre-Tax Net Gains (Losses) on Derivatives Not Designated as Hedging Instruments (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Derivative [Line Items]	'	'	'
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$46	$47	$20
Interest Rate [Member]	'	'	'
Derivative [Line Items]	'	'	'
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	17	22	19
Foreign Exchange [Member]	'	'	'
Derivative [Line Items]	'	'	'
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	38	36	42
Commodity [Member]	'	'	'
Derivative [Line Items]	'	'	'
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	5	9	4
Credit [Member]	'	'	'
Derivative [Line Items]	'	'	'
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	-14	-20	-45
Corporate Services Income [Member]	'	'	'
Derivative [Line Items]	'	'	'
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	61	69	62
Corporate Services Income [Member] | Interest Rate [Member]	'	'	'
Derivative [Line Items]	'	'	'
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	17	24	19
Corporate Services Income [Member] | Foreign Exchange [Member]	'	'	'
Derivative [Line Items]	'	'	'
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	38	36	42
Corporate Services Income [Member] | Commodity [Member]	'	'	'
Derivative [Line Items]	'	'	'
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	5	9	4
Corporate Services Income [Member] | Credit [Member]	'	'	'
Derivative [Line Items]	'	'	'
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	1	'	-3
Other Income [Member]	'	'	'
Derivative [Line Items]	'	'	'
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	-15	-22	-42
Other Income [Member] | Interest Rate [Member]	'	'	'
Derivative [Line Items]	'	'	'
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	'	-2	'
Other Income [Member] | Foreign Exchange [Member]	'	'	'
Derivative [Line Items]	'	'	'
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	'	'	'
Other Income [Member] | Commodity [Member]	'	'	'
Derivative [Line Items]	'	'	'
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	'	'	'
Other Income [Member] | Credit [Member]	'	'	'
Derivative [Line Items]	'	'	'
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	($15)	($20)	($42)

Derivatives_and_Hedging_Activi8

Derivatives and Hedging Activities - Largest Exposure to Individual Counterparty (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Derivative Instruments And Hedging Activities Disclosure [Abstract]	'	'
Largest gross exposure (derivative asset) to an individual counterparty	$121	$182
Collateral posted by this counterparty	42	66
Derivative liability with this counterparty	106	191
Collateral pledged to this counterparty	33	82
Net exposure after netting adjustments and collateral	$6	$7

Derivatives_and_Hedging_Activi9

Derivatives and Hedging Activities - Fair Value of Derivative Assets by Type (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Credit Derivatives [Line Items]	'	'
Derivative assets before collateral	$715	$1,187
Less: Related collateral	308	494
Total derivative assets	407	693
Interest Rate [Member]	'	'
Credit Derivatives [Line Items]	'	'
Derivative assets before collateral	633	1,114
Foreign Exchange [Member]	'	'
Credit Derivatives [Line Items]	'	'
Derivative assets before collateral	23	23
Commodity [Member]	'	'
Credit Derivatives [Line Items]	'	'
Derivative assets before collateral	58	47
Credit [Member]	'	'
Credit Derivatives [Line Items]	'	'
Derivative assets before collateral	$1	$3

Recovered_Sheet1

Derivatives and Hedging Activities - Fair Value of Credit Derivatives Purchased and Sold (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Credit Derivatives [Line Items]	'	'
Purchased	($7)	($1)
Sold	'	'
Credit derivatives, net	-7	-1
Single Name Credit Default Swaps [Member]	'	'
Credit Derivatives [Line Items]	'	'
Purchased	-7	-1
Sold	1	1
Credit derivatives, net	-6	'
Traded Credit Default Swap Indices [Member]	'	'
Credit Derivatives [Line Items]	'	'
Purchased	'	'
Sold	'	'
Credit derivatives, net	'	'
Other [Member]	'	'
Credit Derivatives [Line Items]	'	'
Purchased	'	'
Sold	-1	-1
Credit derivatives, net	($1)	($1)

Recovered_Sheet2

Derivatives and Hedging Activities - Credit Derivatives Sold and Held (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Credit Derivatives [Line Items]	'	'
Notional Amount	$68	$169
Payment / Performance Risk	0.00%	0.00%
Single Name Credit Default Swaps [Member]	'	'
Credit Derivatives [Line Items]	'	'
Notional Amount	55	146
Average Term (Years)	'9 months 7 days	'11 months 1 day
Payment / Performance Risk	22.28%	11.62%
Traded Credit Default Swap Indices [Member]	'	'
Credit Derivatives [Line Items]	'	'
Notional Amount	'	'
Payment / Performance Risk	0.00%	0.00%
Other [Member]	'	'
Credit Derivatives [Line Items]	'	'
Notional Amount	$13	$23
Average Term (Years)	'5 years 11 days	'5 years 4 months 6 days
Payment / Performance Risk	8.82%	10.77%

Recovered_Sheet3

Derivatives and Hedging Activities - Credit Risk Contingent Feature (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Credit Derivatives [Line Items]	'	'
Additional collateral aggregate fair value	$100	'
Moody's, A3 Rating [Member] | One Rating Downgrade [Member]	'	'
Credit Derivatives [Line Items]	'	'
Additional collateral aggregate fair value	6	6
Moody's, A3 Rating [Member] | Two Rating Downgrades [Member]	'	'
Credit Derivatives [Line Items]	'	'
Additional collateral aggregate fair value	11	11
Moody's, A3 Rating [Member] | Three Rating Downgrades [Member]	'	'
Credit Derivatives [Line Items]	'	'
Additional collateral aggregate fair value	11	11
Standard & Poor's, A- Rating [Member] | One Rating Downgrade [Member]	'	'
Credit Derivatives [Line Items]	'	'
Additional collateral aggregate fair value	6	6
Standard & Poor's, A- Rating [Member] | Two Rating Downgrades [Member]	'	'
Credit Derivatives [Line Items]	'	'
Additional collateral aggregate fair value	11	11
Standard & Poor's, A- Rating [Member] | Three Rating Downgrades [Member]	'	'
Credit Derivatives [Line Items]	'	'
Additional collateral aggregate fair value	$11	$11

Mortgage_Servicing_Assets_Chan

Mortgage Servicing Assets - Changes in Carrying Amount of Mortgage Servicing Assets (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Servicing Asset [Abstract]	'	'
Balance at beginning of period	$204	$173
Servicing retained from loan sales	48	47
Purchases	150	44
Amortization	-70	-60
Balance at end of period	332	204
Fair value at end of period	$386	$238

Mortgage_Servicing_Assets_Chan1

Mortgage Servicing Assets - Changes in Carrying Amount of Mortgage Servicing Assets (Parenthetical) (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Servicing Assets at Amortized Value [Line Items]	'	'
Purchases	$150	$44
Mortgage Servicing Assets [Member]	'	'
Servicing Assets at Amortized Value [Line Items]	'	'
Purchases	$120	'

Mortgage_Servicing_Assets_Sche

Mortgage Servicing Assets - Schedule of Range and Weighted-Average of Significant Unobservable Inputs (Detail) (Mortgage Servicing Assets [Member], Discounted Cash Flow [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Servicing Assets at Fair Value [Line Items]	'	'
Prepayment speed	11.00%	8.60%
Expected defaults	2.10%	2.40%
Residual cash flows discount rate	7.90%	9.00%
Escrow earn rate	1.50%	1.50%
Servicing cost	$962	$2,483
Loan assumption rate	1.43%	2.32%
Percentage late	0.35%	0.22%
Minimum [Member]	'	'
Servicing Assets at Fair Value [Line Items]	'	'
Prepayment speed	0.90%	0.90%
Expected defaults	1.10%	1.00%
Residual cash flows discount rate	7.00%	7.00%
Escrow earn rate	0.30%	0.24%
Servicing cost	150	916
Loan assumption rate	0.00%	0.00%
Percentage late	0.00%	0.00%
Maximum [Member]	'	'
Servicing Assets at Fair Value [Line Items]	'	'
Prepayment speed	72.80%	75.80%
Expected defaults	3.00%	3.00%
Residual cash flows discount rate	15.00%	15.00%
Escrow earn rate	3.30%	2.56%
Servicing cost	$9,296	$16,604
Loan assumption rate	3.00%	3.00%
Percentage late	2.00%	2.00%

Mortgage_Servicing_Assets_Addi

Mortgage Servicing Assets - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Servicing Asset [Abstract]	'	'
Increase (decrease) in value assigned to escrow deposits	-1.00%	'
Increase (decrease) in the fair value of mortgage servicing assets	$54	'
Increase (decrease) in assumed default rate of commercial mortgage loans	1.00%	'
Increase (decrease) in the fair value of mortgage servicing assets due to change in the assumed default rate of commercial mortgage loans	4	'
Contractual fee income from servicing commercial mortgage loans	$58	$25

Goodwill_and_Other_Intangible_2

Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $)	12 Months Ended			3 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Mar. 31, 2009	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013
				Key Corporate Bank [Member]	Key Corporate Bank [Member]	Key Corporate Bank [Member]	New York [Member]	New York [Member]	New York [Member]	Elan Financial Services Inc [Member]
								Core deposit intangibles [Member]	Purchased Credit Card Relationship Intangible [Member]	Purchased Credit Card Relationship Intangible [Member]
Goodwill And Other Intangible Asset [Line Items]	'	'	'	'	'	'	'	'	'	'
Estimated fair value of the Community Bank unit greater than certain percent of carrying value	23.00%	10.00%	'	'	'	'	'	'	'	'
Pre-tax impairment charge based on additional Impairment testing	'	'	'	$223	'	'	'	'	'	'
Business acquisition, goodwill	'	62	'	'	'	'	62	'	'	'
Expected deductible goodwill for tax purpose	129	'	'	'	'	'	'	'	'	'
Accumulated impairment losses	665	665	665	'	'	'	'	'	'	'
Intangible asset	'	'	'	'	'	'	'	40	1	135
Useful life of intangible asset	'	'	'	'	'	'	'	'7 years	'8 years	'8 years
Intangible asset amortization expense	44	23	4	'	'	'	'	'	'	'
Estimated Amortization expense 2014	37	'	'	'	'	'	'	'	'	'
Estimated Amortization expense 2015	31	'	'	'	'	'	'	'	'	'
Estimated Amortization expense 2016	24	'	'	'	'	'	'	'	'	'
Estimated Amortization expense 2017	18	'	'	'	'	'	'	'	'	'
Estimated Amortization expense 2018	$11	'	'	'	'	'	'	'	'	'

Goodwill_and_Other_Intangible_3

Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill (Detail) (USD $)	3 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2009	Dec. 31, 2013	Dec. 31, 2012
Goodwill [Line Items]	'	'	'
Beginning Balance	'	$979	$917
Impairment losses based on results of interim impairment testing	'	'	'
Acquisition of Western New York branches	'	'	62
Ending Balance	'	979	979
Key Community Bank [Member]	'	'	'
Goodwill [Line Items]	'	'	'
Beginning Balance	'	979	917
Impairment losses based on results of interim impairment testing	'	'	'
Acquisition of Western New York branches	'	'	62
Ending Balance	'	979	979
Key Corporate Bank [Member]	'	'	'
Goodwill [Line Items]	'	'	'
Beginning Balance	'	'	'
Impairment losses based on results of interim impairment testing	223	'	'
Acquisition of Western New York branches	'	'	'
Ending Balance	'	'	'

Goodwill_and_Other_Intangible_4

Goodwill and Other Intangible Assets - Gross Carrying Amount and Accumulated Amortization of Intangible Assets (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Goodwill [Line Items]	'	'
Gross Carrying Amount	$376	$376
Accumulated Amortization	249	205
Purchased Credit Card Relationship Intangible [Member]	'	'
Goodwill [Line Items]	'	'
Gross Carrying Amount	136	136
Accumulated Amortization	44	14
Core deposit intangibles [Member]	'	'
Goodwill [Line Items]	'	'
Gross Carrying Amount	105	105
Accumulated Amortization	70	56
Other intangible assets [Member]	'	'
Goodwill [Line Items]	'	'
Gross Carrying Amount	135	135
Accumulated Amortization	$135	$135

Goodwill_and_Other_Intangible_5

Goodwill and Other Intangible Assets - Gross Carrying Amount and Accumulated Amortization of Intangible Assets (Parenthetical) (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Goodwill [Line Items]	'	'
Intangible assets related to acquisition	$376	$376
Purchased Credit Card Relationship Intangible [Member]	'	'
Goodwill [Line Items]	'	'
Intangible assets related to acquisition	136	136
Purchased Credit Card Relationship Intangible [Member] | Elan Financial Services Inc [Member]	'	'
Goodwill [Line Items]	'	'
Intangible assets related to acquisition	'	135
Purchased Credit Card Relationship Intangible [Member] | New York [Member]	'	'
Goodwill [Line Items]	'	'
Intangible assets related to acquisition	'	1
Austin Capital Management [Member]	'	'
Goodwill [Line Items]	'	'
Gross Carrying amount	18	25
Accumulated amortization	$18	$25

Variable_Interest_Entities_Var

Variable Interest Entities - Variable Interest Entities Information (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013
LIHTC Funds [Member]	'
Variable Interest Entity [Line Items]	'
Variable Interest Entity, Carrying Amount of Assets, Consolidated VIEs	$22
Variable Interest Entity, Carrying Amount of Liabilities, Consolidated VIEs	22
Variable Interest Entity, Carrying Amount of Assets, Unconsolidated VIEs	97
Variable Interest Entity, Carrying Amount of Liabilities, Unconsolidated VIEs	'
Education Loan Securitization Trusts [Member]	'
Variable Interest Entity [Line Items]	'
Variable Interest Entity, Carrying Amount of Assets, Consolidated VIEs	1,980
Variable Interest Entity, Carrying Amount of Liabilities, Consolidated VIEs	1,854
Variable Interest Entity, Carrying Amount of Liabilities, Unconsolidated VIEs	'
LIHTC Investments [Member]	'
Variable Interest Entity [Line Items]	'
Variable Interest Entity, Carrying Amount of Assets, Unconsolidated VIEs	774
Variable Interest Entity, Carrying Amount of Liabilities, Unconsolidated VIEs	'
Maximum Exposure to Loss, Unconsolidated VIEs	$503

Variable_Interest_Entities_Add

Variable Interest Entities - Additional Information (Detail) (USD $)	Dec. 31, 2009	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013
In Millions, unless otherwise specified	Segment, Discontinued Operations [Member]	LIHTC Funds [Member]	LIHTC Funds [Member]	LIHTC Funds [Member]	LIHTC Investments [Member]	Investments [Member]
	Trust		Minimum [Member]	Maximum [Member]		LIHTC Funds [Member]
Variable Interest Entity [Line Items]	'	'	'	'	'	'
Loan securitization trust VIEs	'	$22	'	'	'	$13
Settlement value of third-party interests, approximately	'	'	0	11	'	'
Settlement value of third-party interests, reserves	'	22	'	'	'	'
Number of outstanding securitization trusts	10	'	'	'	'	'
Variable Interest Entity, Carrying Amount of Assets, Unconsolidated VIE	'	97	'	'	774	'
Assets of unconsolidated LIHTC operating partnerships	'	'	'	'	774	'
Maximum exposure to loss, unconsolidated VIE	'	'	'	'	400	'
Recapture tax claim	'	'	'	'	103	'
Additional investments in unconsolidated LIHTC operating partnerships held by consolidated LIHTC	'	'	'	'	$773	'

Income_Taxes_Income_Taxes_Incl

Income Taxes - Income Taxes Included in Income Statement (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]	'	'	'
Federal, currently payable	$216	$178	$78
State, currently payable	26	18	-31
Total currently payable	242	196	47
Federal, deferred	39	41	287
State, deferred	-10	-6	30
Total deferred	29	35	317
Total income tax (benefit) expense	$271	$231	$364

Income_Taxes_Income_Taxes_Incl1

Income Taxes - Income Taxes Included in Income Statement (Parenthetical) (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]	'	'	'
Income tax (benefit) expense on securities transactions	$1	$0	$0.40
Equity and gross receipts based taxes assessed in lieu of income tax recorded in noninterest expense	$23	$29	$21

Income_Taxes_Significant_Compo

Income Taxes - Significant Components of Deferred Tax Assets and Liabilities Included in "Accrued Income and Other Assets" and "Accrued Expense and Other Liabilities" (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Income Tax Disclosure [Abstract]	'	'
Allowance for loan and lease losses	$334	$354
Employee benefits	187	232
Net unrealized securities losses	45	'
Federal credit carryforwards	226	339
State net operating losses and credits	11	15
Other	302	327
Gross deferred tax assets	1,105	1,267
Less: valuation allowance	1	3
Total deferred tax assets	1,104	1,264
Leasing transactions	753	830
Net unrealized securities gains	'	156
Other	141	156
Total deferred tax liabilities	894	1,142
Net deferred tax assets (liabilities)	$210	$122

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Taxes [Line Items]	'	'	'
Valuation allowance	$1	$3	'
Credit carryforward	226	339	'
Total deferred tax asset	1,104	1,264	'
After-tax interest refunds from IRS	'	'	23
Interest assessments amount received	'	'	16
Unrecognized tax benefits	6	7	'
Net interest credits (expenses)	1.4	-0.2	52
Net interest credit (expenses) attributable to leveraged lease transactions	'	'	25
Recovery of penalties related to unrecognized tax benefits in income tax expense	0.2	0	'
Accrued interest payable	1.1	1.5	'
Federal [Member]	'	'	'
Income Taxes [Line Items]	'	'	'
Credit carryforward	226	'	'
State [Member]	'	'	'
Income Taxes [Line Items]	'	'	'
Credit carryforward	6	'	'
State net operating loss carryforwards	136	'	'
Total deferred tax asset	10	'	'
Accrued state tax penalties	$0.30	$0.50	'

Income_Taxes_Total_Income_Tax_

Income Taxes - Total Income Tax Expense (Benefit) and Resulting Effective Tax Rate (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]	'	'	'
Income (loss) before income taxes times 35% statutory federal tax rate, Amount	$399	$376	$466
Amortization of tax-advantaged investments, Amount	63	64	65
Foreign tax adjustments, Amount	-4	1	17
Reduced tax rate on lease financing income, Amount	-13	-50	'
Tax-exempt interest income, Amount	-15	-16	-16
Corporate-owned life insurance income, Amount	-42	-43	-42
Increase (decrease) in tax reserves, Amount	'	'	2
Interest refund (net of federal tax benefit), Amount	-1	'	-24
State income tax, net of federal tax benefit, Amount	10	8	-1
Tax credits, Amount	-130	-119	-125
Other, Amount	4	10	22
Total income tax (benefit) expense	$271	$231	$364
Income (loss) before income taxes times 35% statutory federal tax rate, Rate	35.00%	35.00%	35.00%
Amortization of tax-advantaged investments, Rate	5.50%	6.00%	4.90%
Foreign tax adjustments, Rate	-0.30%	0.10%	1.30%
Reduced tax rate on lease financing income, Rate	-1.20%	-4.70%	'
Tax-exempt interest income, Rate	-1.30%	-1.50%	-1.20%
Corporate-owned life insurance income, Rate	-3.70%	-4.00%	-3.20%
Increase (decrease) in tax reserves, Rate	'	'	0.20%
Interest refund (net of federal tax benefit), Rate	-0.10%	'	-1.80%
State income tax, net of federal tax benefit, Rate	0.90%	0.70%	-0.10%
Tax credits, Rate	-11.40%	-11.10%	-9.40%
Other, Rate	0.30%	0.90%	1.70%
Total income tax expense (benefit), Rate	23.70%	21.40%	27.40%

Income_Taxes_Change_in_Liabili

Income Taxes - Change in Liability for Unrecognized Tax Benefits (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]	'	'
Balance at beginning of year	$7	$8
Decrease related to other settlements with taxing authorities	-1	-1
Balance at end of year	$6	$7

Acquisitions_and_Discontinued_

Acquisitions and Discontinued Operations - Additional Information (Detail) (USD $)

1 Months Ended

9 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

0 Months Ended

3 Months Ended

Dec. 20, 2013

Sep. 30, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Jun. 30, 2013

Dec. 31, 2013

Aug. 01, 2012

Sep. 14, 2012

Sep. 30, 2012

Jul. 13, 2012

Dec. 31, 2013

Sep. 30, 2013

Dec. 31, 2012

Dec. 31, 2009

Trust

Level 3 [Member]

Level 3 [Member]

Victory Capital Management [Member]

Mortgage Servicing Rights [Member]

Mortgage Servicing Rights [Member]

Education Loans [Member]

Key-Branded Credit Card [Member]

New York [Member]

New York [Member]

New York [Member]

Segment, Discontinued Operations [Member]

Segment, Discontinued Operations [Member]

Segment, Discontinued Operations [Member]

Segment, Discontinued Operations [Member]

Level 3 [Member]

TDRs

Branch

Trust

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Business acquisition intangible asset

'

'

$3,000,000

'

'

'

'

'

$120,000,000

$117,000,000

'

'

'

$40,000,000

'

'

'

'

'

Principal and interest advances

'

'

216,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Acquired credit card assets

'

'

'

'

'

'

'

'

'

'

'

718,000,000

68,000,000

'

'

'

'

'

'

Estimated purchased credit card relationship intangible asset

'

'

'

'

'

'

'

'

'

'

'

135,000,000

1,000,000

'

'

'

'

'

'

Assumed reward liability

'

'

'

'

'

'

'

'

'

'

'

9,000,000

1,000,000

'

'

'

'

'

'

Number of retail banking branches acquired

'

'

'

'

'

'

'

'

'

'

'

'

'

'

37

'

'

'

'

Estimated fair value of the assets and deposits acquired

'

'

'

'

'

'

'

'

'

'

'

'

'

2,000,000,000

'

'

'

'

'

Loans purchased associated with branches acquired

'

'

'

'

'

'

'

'

'

'

'

'

'

244,000,000

'

'

'

'

'

Credit impaired loans purchased associated with branches acquired

'

'

'

'

'

'

'

'

'

'

'

'

'

25,000,000

'

'

'

'

'

Business acquisition premises and equipment

'

'

'

'

'

'

'

'

'

'

'

'

'

8,000,000

'

'

'

'

'

Deposits assumed associated with branches acquired in purchase and assumption agreement

'

'

'

'

'

'

'

'

'

'

'

'

'

2,000,000,000

'

'

'

'

'

Business acquisition cash received

'

'

'

'

'

'

'

'

'

'

'

'

'

1,800,000,000

'

'

'

'

'

Business acquisition goodwill asset

'

'

'

'

'

'

'

'

'

'

'

'

'

62,000,000

'

'

'

'

'

Business acquisition, cash payment

'

'

'

'

'

'

'

'

'

'

'

'

68,000,000

'

'

'

'

'

'

Goodwill acquired

'

'

'

'

'

'

'

'

'

'

'

'

0

'

'

'

'

'

'

Investment recorded

'

'

'

'

'

'

'

'

'

'

13,000,000

'

'

'

'

'

'

'

'

Allowance for loan held as investment

'

'

848,000,000

888,000,000

'

'

'

'

'

'

1,000,000

'

'

'

'

39,000,000

'

55,000,000

'

Number of TDRs

'

'

'

'

'

'

'

'

'

'

1,041

'

'

'

'

'

'

'

'

Number of outstanding securitization trusts

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

10

Economic interest or risk of loss associated with education loan securitization trusts

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

126,000,000

'

'

'

Fair value of loans and securities in securitization trusts after tax loss

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

48,000,000

'

'

Loans sold

147,000,000

'

185,000,000

277,000,000

218,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Gain on sale of loan

3,000,000

'

125,000,000

150,000,000

75,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Loans purchased

'

'

140,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Loans at fair value

'

'

147,000,000

157,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of outstanding securitizations trusts

'

'

3

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

After tax gain on sale of subsidiary

'

92,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Cash portion in gain

'

72,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total assets on a recurring basis at fair value

'

'

$30,000,000

$56,000,000

'

$30,000,000

$54,000,000

$29,000,000

'

'

'

'

'

'

'

'

'

'

'

U.S. Treasury Rate Period

'

'

'

'

'

'

'

'7 years

'

'

'

'

'

'

'

'

'

'

'

Discount rate used for the Seller note

'

13.25%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Acquisitions_and_Discontinued_1

Acquisitions and Discontinued Operations - Components of Income (Loss) from Discontinued Operations, Net of Taxes for Education Lending Business (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'
Net interest income	$2,325	$2,264	$2,267
Provision (credit) for loan and lease losses	128	229	-59
Net interest income (expense) after provision for loan and lease losses	2,195	2,035	2,327
Noninterest expense	2,820	2,818	2,684
Income taxes	271	231	364
Income (loss) from discontinued operations, net of taxes	40	23	-35
Segment, Discontinued Operations [Member]	'	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'
Net interest income	105	119	138
Provision (credit) for loan and lease losses	20	9	113
Net interest income (expense) after provision for loan and lease losses	85	110	25
Noninterest expense	95	135	147
Income (loss) before income taxes	66	37	-56
Income taxes	26	14	-21
Income (loss) from discontinued operations, net of taxes	40	23	-35
Education Lending [Member]	'	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'
Income (loss) before income taxes	-79	25	-69
Income taxes	-29	9	-26
Income (loss) from discontinued operations, net of taxes	-50	16	-43
Education Lending [Member] | Segment, Discontinued Operations [Member]	'	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'
Net interest income	105	119	138
Provision (credit) for loan and lease losses	20	9	113
Net interest income (expense) after provision for loan and lease losses	85	110	25
Noninterest income	-136	-49	-55
Noninterest expense	$28	$36	$39

Acquisitions_and_Discontinued_2

Acquisitions and Discontinued Operations - Components of Income (Loss) from Discontinued Operations, Net of Taxes for Education Lending Business (Parenthetical) (Detail) (Segment, Discontinued Operations [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'
Charges determined by applying a matched funds transfer pricing methodology to the liabilities assumed necessary to support the discontinued operations, after tax	$40	$50	$50
Education Lending [Member]	'	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'
Charges determined by applying a matched funds transfer pricing methodology to the liabilities assumed necessary to support the discontinued operations, after tax	$40	$50	$50

Acquisitions_and_Discontinued_3

Acquisitions and Discontinued Operations - Components of Assets and Liabilities of Education Lending Business (Detail) (USD $)	Dec. 31, 2013		Dec. 31, 2012
In Millions, unless otherwise specified
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'		'
Loans at fair value	$147		$157
Loans, net of unearned income of ($6) and ($5)	54,457		52,822
Less: Allowance for loan and lease losses	848		888
Net loans	53,609		51,934
Trust accrued income and other assets at fair value	14		22
Accrued income and other assets	3,015	[1]	2,774	[1]
Total assets	92,934		89,236
Trust accrued expense and other liabilities at fair value	1,557		1,387
Total liabilities	82,614		78,927
Segment, Discontinued Operations [Member]	'		'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'		'
Loans, net of unearned income of ($6) and ($5)	2,390		2,675
Less: Allowance for loan and lease losses	39		55
Net loans	4,458		5,146
Accrued income and other assets	74		87
Total assets	4,572		5,282
Total liabilities	1,854		2,220
Education Lending [Member]	'		'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'		'
Total assets	4,523		5,232
Total liabilities	1,854		2,181
Education Lending [Member] | Segment, Discontinued Operations [Member]	'		'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'		'
Loans, net of unearned income of ($6) and ($5)	2,390		2,675
Less: Allowance for loan and lease losses	39		55
Net loans	4,458		5,146
Accrued income and other assets	45		60
Trust [Member] | Segment, Discontinued Operations [Member]	'		'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'		'
Loans at fair value	1,960		2,369
Trust accrued income and other assets at fair value	20		26
Trust accrued expense and other liabilities at fair value	20		22
Trust securities at fair value	1,834		2,159
Trust [Member] | Education Lending [Member] | Segment, Discontinued Operations [Member]	'		'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'		'
Loans at fair value	1,960		2,369
Trust accrued income and other assets at fair value	20		26
Trust accrued expense and other liabilities at fair value	20		22
Trust securities at fair value	1,834		2,159
Portfolio [Member] | Segment, Discontinued Operations [Member]	'		'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'		'
Loans at fair value	147		157
Portfolio [Member] | Education Lending [Member] | Segment, Discontinued Operations [Member]	'		'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'		'
Loans at fair value	$147		$157
[1]	The assets of the VIEs can only be used by the particular VIE and there is no recourse to Key with respect to the liabilities of the consolidated LIHTC or education loan securitization trust VIEs.

Acquisitions_and_Discontinued_4

Acquisitions and Discontinued Operations - Components of Assets and Liabilities of Education Lending Business (Parenthetical) (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'
Unearned income on loans	($805)	($957)
Segment, Discontinued Operations [Member]	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'
Unearned income on loans	-6	-5
Segment, Discontinued Operations [Member] | Education Lending [Member]	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'
Unearned income on loans	($6)	($5)

Acquisitions_and_Discontinued_5

Acquisitions and Discontinued Operations - Quantitative Information about Level 3 Fair Value Measurements (Detail) (Level 3 [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Prepayment Speed Trust Loans and Portfolio Loans [Member]	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Percentage of significant unobservable input weighted-average	6.47%	9.74%
Loss Severity [Member]	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Percentage of significant unobservable input weighted-average	54.21%	49.61%
Loan Discount Rates [Member]	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Percentage of significant unobservable input weighted-average	3.50%	5.12%
Loan Default Rate [Member]	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Percentage of significant unobservable input weighted-average	18.43%	13.44%
Discount Rate Trust Securities [Member]	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Percentage of significant unobservable input weighted-average	2.55%	4.14%
Trust Loans [Member]	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Trust loans and portfolio loans accounted for at fair value	$2,107	$2,526
Valuation Techniques	'Discounted cash flow	'Discounted cash flow
Trust Securities [Member]	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Trust loans and portfolio loans accounted for at fair value	$1,834	$2,159
Valuation Techniques	'Discounted cash flow	'Discounted cash flow
Minimum [Member] | Prepayment Speed Trust Loans and Portfolio Loans [Member]	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Percentage of significant unobservable input weighted-average	4.00%	4.00%
Minimum [Member] | Loss Severity [Member]	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Percentage of significant unobservable input weighted-average	2.00%	2.00%
Minimum [Member] | Loan Discount Rates [Member]	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Percentage of significant unobservable input weighted-average	2.40%	2.40%
Minimum [Member] | Loan Default Rate [Member]	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Percentage of significant unobservable input weighted-average	8.01%	8.13%
Minimum [Member] | Discount Rate Trust Securities [Member]	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Percentage of significant unobservable input weighted-average	1.60%	1.50%
Maximum [Member] | Prepayment Speed Trust Loans and Portfolio Loans [Member]	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Percentage of significant unobservable input weighted-average	13.50%	26.00%
Maximum [Member] | Loss Severity [Member]	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Percentage of significant unobservable input weighted-average	79.50%	80.00%
Maximum [Member] | Loan Discount Rates [Member]	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Percentage of significant unobservable input weighted-average	10.50%	10.50%
Maximum [Member] | Loan Default Rate [Member]	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Percentage of significant unobservable input weighted-average	23.71%	21.50%
Maximum [Member] | Discount Rate Trust Securities [Member]	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Percentage of significant unobservable input weighted-average	3.50%	6.10%

Acquisitions_and_Discontinued_6

Acquisitions and Discontinued Operations - Principal and Fair Value Amounts for Trust Loans at Fair Value, Portfolio Loans at Fair Value, and Portfolio Loans at Carrying Value (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Principal [Member] | Trust [Member]	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'
Accruing loans past due 90 days or more	$25	$35
Loans placed on nonaccrual status	12	14
Principal [Member] | Portfolio [Member] | Fair Value [Member]	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'
Accruing loans past due 90 days or more	8	5
Principal [Member] | Portfolio [Member] | Carrying Amount [Member]	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'
Accruing loans past due 90 days or more	35	44
Loans placed on nonaccrual status	10	6
Fair Value [Member] | Trust [Member]	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'
Accruing loans past due 90 days or more	25	34
Loans placed on nonaccrual status	12	14
Fair Value [Member] | Portfolio [Member] | Fair Value [Member]	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'
Accruing loans past due 90 days or more	$8	$6

Acquisitions_and_Discontinued_7

Acquisitions and Discontinued Operations - Consolidated Trusts' Assets and Liabilities at Fair Value and Contractual Values (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'
Trust loans accounted for at fair value	$147	$157
Segment, Discontinued Operations [Member] | Education Lending [Member]	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'
Portfolio fair value of loans	147	157
Segment, Discontinued Operations [Member] | Trust [Member]	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'
Trust loans accounted for at fair value	1,960	2,369
Trust fair value of securities	1,834	2,159
Segment, Discontinued Operations [Member] | Trust [Member] | Education Lending [Member]	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'
Portfolio contractual amount of loans	140	151
Trust contractual amount of loans	1,964	2,443
Trust contractual amount of other assets	20	26
Trust contractual amount of securities	1,958	2,473
Trust contractual amount of other liabilities	20	22
Portfolio fair value of loans	147	157
Trust loans accounted for at fair value	1,960	2,369
Trust fair value of other assets	20	26
Trust fair value of securities	1,834	2,159
Trust fair value of other liabilities	$20	$22

Acquisitions_and_Discontinued_8

Acquisitions and Discontinued Operations - Consolidated Assets and Liabilities at Fair Value on Recurring Basis (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total assets at fair value	$30	$56
Segment, Discontinued Operations [Member] | Education Lending [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Portfolio loans	147	157
Trust loans	1,960	2,369
Trust other assets	20	26
Total assets at fair value	2,127	2,552
LIABILITIES MEASURED ON A RECURRING BASIS	'	'
Trust securities	1,834	2,159
Trust other liabilities	20	22
Total liabilities on a recurring basis at fair value	1,854	2,181
Level 1 [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total assets at fair value	'	'
Level 1 [Member] | Segment, Discontinued Operations [Member] | Education Lending [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Portfolio loans	'	'
Trust loans	'	'
Trust other assets	'	'
Total assets at fair value	'	'
LIABILITIES MEASURED ON A RECURRING BASIS	'	'
Trust securities	'	'
Trust other liabilities	'	'
Total liabilities on a recurring basis at fair value	'	'
Level 2 [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total assets at fair value	'	2
Level 2 [Member] | Segment, Discontinued Operations [Member] | Education Lending [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Portfolio loans	'	'
Trust loans	'	'
Trust other assets	'	'
Total assets at fair value	'	'
LIABILITIES MEASURED ON A RECURRING BASIS	'	'
Trust securities	'	'
Trust other liabilities	'	'
Total liabilities on a recurring basis at fair value	'	'
Level 3 [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Total assets at fair value	30	54
Level 3 [Member] | Segment, Discontinued Operations [Member] | Education Lending [Member]	'	'
ASSETS MEASURED ON A RECURRING BASIS	'	'
Portfolio loans	147	157
Trust loans	1,960	2,369
Trust other assets	20	26
Total assets at fair value	2,127	2,552
LIABILITIES MEASURED ON A RECURRING BASIS	'	'
Trust securities	1,834	2,159
Trust other liabilities	20	22
Total liabilities on a recurring basis at fair value	$1,854	$2,181

Acquisitions_and_Discontinued_9

Acquisitions and Discontinued Operations - Change in Fair Values of Level 3 Consolidated Education Loan Securitization Trusts and Portfolio Loans (Detail) (Segment, Discontinued Operations [Member], Education Lending [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Portfolio Student Loans [Member]	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'
Beginning Balance	$157	$76
Gains (losses) recognized in earnings	'	3
Purchases	152	86
Sales	-147	'
Issuances	'	'
Settlements	-15	-8
Ending Balance	147	157
Trust Student Loans [Member]	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'
Beginning Balance	2,369	2,726
Gains (losses) recognized in earnings	53	83
Purchases	'	'
Sales	-152	-86
Issuances	'	'
Settlements	-310	-354
Ending Balance	1,960	2,369
Trust Other Assets [Member]	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'
Beginning Balance	26	34
Gains (losses) recognized in earnings	'	'
Purchases	'	'
Sales	'	'
Issuances	'	'
Settlements	-6	-8
Ending Balance	20	26
Trust Securities [Member]	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'
Beginning Balance	2,159	2,522
Gains (losses) recognized in earnings	191	143
Purchases	'	'
Sales	'	'
Issuances	'	'
Settlements	-516	-506
Ending Balance	1,834	2,159
Trust Other Liabilities [Member]	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'
Beginning Balance	22	28
Gains (losses) recognized in earnings	'	'
Purchases	'	'
Sales	'	'
Issuances	'	'
Settlements	-2	-6
Ending Balance	$20	$22

Recovered_Sheet4

Acquisitions and Discontinued Operations - Components of Income (Loss) from Discontinued Operations, Net of Taxes (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'
Noninterest income	$1,766	$1,856	$1,688
Noninterest expense	2,820	2,818	2,684
Income taxes	271	231	364
Income (loss) from discontinued operations, net of taxes	40	23	-35
Segment, Discontinued Operations [Member]	'	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'
Noninterest income	76	62	66
Noninterest expense	95	135	147
Income (loss) before income taxes	66	37	-56
Income taxes	26	14	-21
Income (loss) from discontinued operations, net of taxes	40	23	-35
Segment, Discontinued Operations [Member] | Victory Capital Management [Member]	'	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'
Noninterest income	212	111	120
Noninterest expense	66	89	106
Income (loss) before income taxes	146	22	14
Income taxes	54	8	5
Income (loss) from discontinued operations, net of taxes	92	14	9
Segment, Discontinued Operations [Member] | Austin Capital Management [Member]	'	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'
Noninterest income	'	'	1
Noninterest expense	1	10	2
Income (loss) before income taxes	-1	-10	-1
Income taxes	1	-3	'
Income (loss) from discontinued operations, net of taxes	($2)	($7)	($1)

Recovered_Sheet5

Acquisitions and Discontinued Operations - Components of Assets and Liabilities from Discontinued Operations (Detail) (USD $)	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2010
In Millions, unless otherwise specified
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'		'		'	'
Cash and due from banks	$617		$584		$693	$278
Total assets	4,572	[1]	5,282	[1]	'	'
Total liabilities	1,854	[1]	2,220	[1]	'	'
Segment, Discontinued Operations [Member]	'		'		'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'		'		'	'
Cash and due from banks	20		23		'	'
Accrued expense and other liabilities	'		39		'	'
Segment, Discontinued Operations [Member] | Victory Capital Management [Member]	'		'		'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'		'		'	'
Cash and due from banks	'		1		'	'
Accrued income and other assets	29		27		'	'
Total assets	29		28		'	'
Accrued expense and other liabilities	'		38		'	'
Total liabilities	'		38		'	'
Segment, Discontinued Operations [Member] | Austin Capital Management [Member]	'		'		'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'		'		'	'
Cash and due from banks	20		22		'	'
Total assets	20		22		'	'
Accrued expense and other liabilities	'		1		'	'
Total liabilities	'		$1		'	'
[1]	The assets of the VIEs can only be used by the particular VIE and there is no recourse to Key with respect to the liabilities of the consolidated LIHTC or education loan securitization trust VIEs.

Recovered_Sheet6

Acquisitions and Discontinued Operations -Victory Seller Note Measured at Fair Value on Recurring Basis (Detail) (Victory Capital Management [Member], USD $)	Dec. 31, 2013
In Millions, unless otherwise specified
Fair Value Assets Measured On Recurring Basis Unobservable Inputs [Line Items]	'
Seller note	$29
Level 1 [Member]	'
Fair Value Assets Measured On Recurring Basis Unobservable Inputs [Line Items]	'
Seller note	'
Level 2 [Member]	'
Fair Value Assets Measured On Recurring Basis Unobservable Inputs [Line Items]	'
Seller note	'
Level 3 [Member]	'
Fair Value Assets Measured On Recurring Basis Unobservable Inputs [Line Items]	'
Seller note	29
Seller Note [Member]	'
Fair Value Assets Measured On Recurring Basis Unobservable Inputs [Line Items]	'
Seller note	29
Seller Note [Member] | Level 1 [Member]	'
Fair Value Assets Measured On Recurring Basis Unobservable Inputs [Line Items]	'
Seller note	'
Seller Note [Member] | Level 2 [Member]	'
Fair Value Assets Measured On Recurring Basis Unobservable Inputs [Line Items]	'
Seller note	'
Seller Note [Member] | Level 3 [Member]	'
Fair Value Assets Measured On Recurring Basis Unobservable Inputs [Line Items]	'
Seller note	$29

Recovered_Sheet7

Acquisitions and Discontinued Operations - Schedule of Change in Fair Value of Level 3 Victory Seller Note (Detail) (Level 3 [Member], Seller Note [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013
Level 3 [Member] | Seller Note [Member]	'
Changes In Level 3 Assets And Liabilities Measured At Fair Value On Recurring Basis [Line Items]	'
Beginning Balance	'
Gains (losses) recognized in earnings	-3
Purchases	'
Sales	'
Issuances	32
Settlements	'
Ending Balance	$29

Recovered_Sheet8

Acquisitions and Discontinued Operations - Combined Results of Discontinued Operations (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'
Net interest income	$2,325	$2,264	$2,267
Provision (credit) for loan and lease losses	128	229	-59
Net interest income (expense) after provision for loan and lease losses	2,195	2,035	2,327
Noninterest income	1,766	1,856	1,688
Noninterest expense	2,820	2,818	2,684
Income taxes	271	231	364
Income (loss) from discontinued operations, net of taxes	40	23	-35
Segment, Discontinued Operations [Member]	'	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'
Net interest income	105	119	138
Provision (credit) for loan and lease losses	20	9	113
Net interest income (expense) after provision for loan and lease losses	85	110	25
Noninterest income	76	62	66
Noninterest expense	95	135	147
Income (loss) before income taxes	66	37	-56
Income taxes	26	14	-21
Income (loss) from discontinued operations, net of taxes	$40	$23	($35)

Recovered_Sheet9

Acquisitions and Discontinued Operations - Combined Results of Discontinued Operations (Parenthetical) (Detail) (Segment, Discontinued Operations [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment, Discontinued Operations [Member]	'	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'
Charges determined by applying a matched funds transfer pricing methodology to the liabilities assumed necessary to support the discontinued operations, after tax	$40	$50	$50

Recovered_Sheet10

Acquisitions and Discontinued Operations - Combined Assets and Liabilities of Discontinued Operations (Detail) (USD $)	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2010
In Millions, unless otherwise specified
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'		'		'	'
Cash and due from banks	$617		$584		$693	$278
Loans at fair value	147		157		'	'
Loans, net of unearned income of ($0) and ($5)	54,457		52,822		'	'
Less: Allowance for loan and lease losses	848		888		'	'
Net loans	53,609		51,934		'	'
Trust accrued income and other assets at fair value	14		22		'	'
Accrued income and other assets	3,015	[1]	2,774	[1]	'	'
Total assets	92,934		89,236		'	'
Trust accrued expense and other liabilities at fair value	1,557		1,387		'	'
Total liabilities	82,614		78,927		'	'
Segment, Discontinued Operations [Member]	'		'		'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'		'		'	'
Cash and due from banks	20		23		'	'
Loans, net of unearned income of ($0) and ($5)	2,390		2,675		'	'
Less: Allowance for loan and lease losses	39		55		'	'
Net loans	4,458		5,146		'	'
Accrued income and other assets	74		87		'	'
Total assets	4,572		5,282		'	'
Accrued expense and other liabilities	'		39		'	'
Total liabilities	1,854		2,220		'	'
Segment, Discontinued Operations [Member] | Trust [Member]	'		'		'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'		'		'	'
Loans at fair value	1,960		2,369		'	'
Trust accrued income and other assets at fair value	20		26		'	'
Trust accrued expense and other liabilities at fair value	20		22		'	'
Trust securities at fair value	1,834		2,159		'	'
Segment, Discontinued Operations [Member] | Portfolio [Member]	'		'		'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'		'		'	'
Loans at fair value	$147		$157		'	'
[1]	The assets of the VIEs can only be used by the particular VIE and there is no recourse to Key with respect to the liabilities of the consolidated LIHTC or education loan securitization trust VIEs.

Recovered_Sheet11

Acquisitions and Discontinued Operations - Combined Assets and Liabilities of Discontinued Operations (Parenthetical) (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'
Unearned income on loans	($805)	($957)
Segment, Discontinued Operations [Member]	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'
Unearned income on loans	($6)	($5)

Securities_Financing_Activitie

Securities Financing Activities - Summarized Securities Financing Agreements (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Securities Financing Transaction [Line Items]	'	'
Reverse repurchase agreements	$3	$4
Securities borrowed	'	'
Total offsetting of financial assets	3	4
Repurchase agreements	'	'
Total offsetting of financial liabilities	'	'
Gross Amount Presented in Balance Sheet [Member]	'	'
Securities Financing Transaction [Line Items]	'	'
Reverse repurchase agreements	347	271
Securities borrowed	12	'
Total offsetting of financial assets	359	271
Repurchase agreements	517	228
Total offsetting of financial liabilities	517	228
Netting Adjustments [Member]	'	'
Securities Financing Transaction [Line Items]	'	'
Reverse repurchase agreements	-278	-95
Securities borrowed	'	'
Total offsetting of financial assets	-278	-95
Repurchase agreements	-278	-95
Total offsetting of financial liabilities	-278	-95
Collateral [Member]	'	'
Securities Financing Transaction [Line Items]	'	'
Reverse repurchase agreements	-66	-172
Securities borrowed	-12	'
Total offsetting of financial assets	-78	-172
Repurchase agreements	-239	-133
Total offsetting of financial liabilities	($239)	($133)

StockBased_Compensation_Additi

Stock-Based Compensation - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Total compensation expense for stock-based compensation plans	$38,000,000	$53,000,000	$41,000,000
Total income tax benefit recognized for stock-based compensation plans	14,000,000	20,000,000	15,000,000
Common Shares available for future grant under compensation plans	89,016,390	'	'
Limit to granting options under any long-term compensation plan	'Aggregate amount that exceeds 6% of our outstanding Common Shares in any rolling three-year period.	'	'
Exercise rate of stock options granted to employees	25.00%	25.00%	33.33%
Common stock shares issued	1,016,969,905	1,016,969,905	'
Weighted-average grant-date fair value of options	$3.55	$3.23	$4.11
Number of options, exercised	3,574,354	'	'
Total intrinsic value of exercised options	13,000,000	1,000,000	1,000,000
Cash received from options exercised	26,000,000	2,000,000	1,000,000
Actual tax benefit realized for tax deductions from options exercised	1,000,000	1,000,000	1,000,000
Weighted-average grant-date fair value granted	$9.33	'	'
Mandatory deferred incentive awards vest at the rate	'	25.00%	33.33%
Maximum [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Common stock shares issued	3,000,000	'	'
Long-Term Incentive Compensation Program [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Unrecognized compensation cost related to nonvested options expected to vest	43,000,000	'	'
Weighted-average period	'2 years 3 months 18 days	'	'
Paid cash awards in connection with vested performance shares	0	0	0
Weighted-average grant-date fair value granted	$10.96	$8.07	$9.12
Total fair value of shares vested	23,000,000	8,000,000	10,000,000
Other Restricted Stock Awards [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Unrecognized compensation cost related to nonvested options expected to vest	4,000,000	'	'
Weighted-average period	'2 years 4 months 24 days	'	'
Weighted-average grant-date fair value granted	$9.33	$7.98	$9.25
Total fair value of shares vested	12,000,000	14,000,000	29,000,000
Deferred Compensation Plans [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Unrecognized compensation cost related to nonvested options expected to vest	6,000,000	'	'
Weighted-average period	'2 years 2 months 12 days	'	'
Weighted-average grant-date fair value granted	$11.18	$6.63	$8.03
Total fair value of shares vested	7,000,000	7,000,000	5,000,000
Stock Options [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Number of options, exercised	3,574,354	421,846	121,089
Unrecognized compensation cost related to nonvested options expected to vest	6,000,000	'	'
Weighted-average period	'2 years 3 months 18 days	'	'
Performance Stock Units [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Vesting period	'Three-year	'	'
Cash Performance Units [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Vesting period	'Three-year	'	'
Deferred Cash Awards [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Vesting percentage	25.00%	'	'
Restricted Stock Unit [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Vesting percentage	25.00%	'	'
Discounted Stock Purchase Plan [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Employee discount on the purchase of stock through Discounted Stock Purchase Plan	10.00%	'	'
Purchases are limited to any month	10,000	'	'
Purchases are limited to any calendar year	$50,000	'	'
Issuance of common shares	264,775	301,794	297,091
Weighted-average cost of common shares issued under the plan	9.83	7.3	7.71

StockBased_Compensation_Assump

Stock-Based Compensation - Assumptions Used in Options Pricing Model (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'	'	'
Average option life	'6 years 3 months 18 days	'6 years 3 months 18 days	'6 years 1 month 6 days
Future dividend yield	2.14%	1.50%	0.43%
Historical share price volatility	0.50%	0.49%	0.48%
Weighted-average risk-free interest rate	1.10%	1.20%	2.60%

StockBased_Compensation_Activi

Stock-Based Compensation - Activity, Pricing and Other Information for Stock Options (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Number of Options Outstanding, Beginning Balance	32,619,819
Granted, Number of Options	1,141,294
Exercised, Number of Options	-3,574,354
Lapsed or canceled, Number of Options	-4,480,817
Number of Options Outstanding, Ending Balance	25,705,942
Expected to vest, Number of Options	4,233,326
Number of Options Exercisable, Ending Balance	21,042,678
Weighted-Average Exercise Price Per Option Outstanding, Beginning Balance	$19.36
Granted, Weighted-Average Exercise Price Per Option	$9.33
Exercised, Weighted-Average Exercise Price Per Option	$7.26
Lapsed or canceled, Weighted-Average Exercise Price Per Option	$24.47
Weighted-Average Exercise Price Per Option Outstanding, Ending Balance	$19.83
Expected to vest, Weighted-Average Exercise Price Per Option	$8.51
Weighted-Average Exercise Price Per Option Exercisable, Beginning Balance	$22.34
Weighted-Average Remaining Life (Years) Outstanding, Ending Balance	'4 years 2 months 12 days
Expected to vest, Weighted-Average Remaining Life (Years)	'8 years 1 month 6 days
Weighted-Average Remaining Life (Years) Exercisable, Ending Balance	'3 years 3 months 18 days
Aggregate Intrinsic Value Outstanding, Ending Balance	$68
Expected to vest, Aggregate Intrinsic Value	21
Aggregate Intrinsic Value Exercisable, Ending Balance	$45

StockBased_Compensation_Activi1

Stock-Based Compensation - Activity and Pricing Information for Nonvested Shares in Long-Term Incentive Compensation Program (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Weighted-Average Grant-Date Fair Value, Granted	$9.33	'	'
Long-Term Incentive Compensation Program [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Weighted-Average Grant-Date Fair Value, Granted	$10.96	$8.07	$9.12
Vesting Contingent on Service Conditions [Member] | Long-Term Incentive Compensation Program [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Number of Nonvested Shares Outstanding, Beginning Balance	5,145,713	'	'
Number of Nonvested Shares, Granted	2,452,490	'	'
Number of Nonvested Shares, Vested	-2,392,842	'	'
Number of Nonvested Shares, Forfeited	-446,985	'	'
Number of Nonvested Shares Outstanding, Ending Balance	4,758,376	'	'
Weighted-Average Grant-Date Fair Value Outstanding, Beginning Balance	$8.27	'	'
Weighted-Average Grant-Date Fair Value, Granted	$9.33	'	'
Weighted-Average Grant-Date Fair Value, Vested	$7.90	'	'
Weighted-Average Grant-Date Fair Value, Forfeited	$8.90	'	'
Weighted-Average Grant-Date Fair Value Outstanding, Ending Balance	$8.94	'	'
Vesting Contingent on Performance and Service Conditions[Member] | Long-Term Incentive Compensation Program [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Number of Nonvested Shares Outstanding, Beginning Balance	4,092,563	'	'
Number of Nonvested Shares, Granted	1,632,641	'	'
Number of Nonvested Shares, Vested	-570,125	'	'
Number of Nonvested Shares, Forfeited	-511,969	'	'
Number of Nonvested Shares Outstanding, Ending Balance	4,643,110	'	'
Weighted-Average Grant-Date Fair Value Outstanding, Beginning Balance	$8.21	'	'
Weighted-Average Grant-Date Fair Value, Granted	$13.42	'	'
Weighted-Average Grant-Date Fair Value, Vested	$8.01	'	'
Weighted-Average Grant-Date Fair Value, Forfeited	$11.91	'	'
Weighted-Average Grant-Date Fair Value Outstanding, Ending Balance	$11.56	'	'

StockBased_Compensation_Activi2

Stock-Based Compensation - Activity and Pricing Information for Nonvested Shares Granted Under Other Restricted Stock Awards (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Weighted-Average Grant Date Fair Value, Granted	$9.33	'	'
Other Restricted Stock Awards [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Number of Nonvested Shares Outstanding, Beginning Balance	2,716,654	'	'
Number of Nonvested Shares, Granted	261,679	'	'
Number of Nonvested Shares, Vested	-1,588,427	'	'
Number of Nonvested Shares, Forfeited	-23,436	'	'
Number of Nonvested Shares Outstanding, Ending Balance	1,366,470	2,716,654	'
Weighted-Average Grant-Date Fair Value Outstanding, Beginning Balance	$7.84	'	'
Weighted-Average Grant Date Fair Value, Granted	$9.33	$7.98	$9.25
Weighted-Average Grant-Date Fair Value, Vested	$7.51	'	'
Weighted-Average Grant-Date Fair Value, Forfeited	$8.55	'	'
Weighted-Average Grant-Date Fair Value Outstanding, Ending Balance	$8.48	$7.84	'

StockBased_Compensation_Activi3

Stock-Based Compensation - Activity and Pricing Information for Nonvested Shares in Deferred Compensation Plans (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Weighted-Average Grant Date Fair Value, Granted	$9.33	'	'
Deferred Compensation Plans [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Number of Nonvested Shares Outstanding, Beginning Balance	1,195,849	'	'
Number of Nonvested Shares, Granted	774,028	'	'
Number of Nonvested Shares, Dividend Equivalents	53,213	'	'
Number of Nonvested Shares, Vested	-661,372	'	'
Number of Nonvested Shares, Forfeited	-17,620	'	'
Number of Nonvested Shares Outstanding, Ending Balance	1,344,098	1,195,849	'
Weighted-Average Grant-Date Fair Value Outstanding, Beginning Balance	$7	'	'
Weighted-Average Grant Date Fair Value, Granted	$11.18	$6.63	$8.03
Weighted-Average Grant Date Fair Value, Dividend Equivalents	$11.18	'	'
Weighted-Average Grant-Date Fair Value, Vested	$8.48	'	'
Weighted-Average Grant-Date Fair Value, Forfeited	$7.94	'	'
Weighted-Average Grant-Date Fair Value Outstanding, Ending Balance	$9.06	$7	'

Employee_Benefits_Additional_I

Employee Benefits - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Pre-tax AOCI not yet recognized as net pension cost	$529	$681	'
Accumulated benefit obligation for all pension plans	1,200	1,300	'
Defined benefit plan, net periodic benefit cost expected in next fiscal year	3	'	'
Defined benefit plan, net periodic benefit cost expected	21	7	'
Maximum limit for vary of market related value	10.00%	'	'
Percentage increase or decrease in expected return on plan assets	0.25%	'	'
Estimated increase or decrease in net pension cost	2	'	'
Percentage increase or decrease in assumed discount rate	0.25%	'	'
Estimated change in net pension cost due to discount rate	1	'	'
Expected return on plan assets	7.25%	7.25%	7.75%
Expected return on plan assets on estimating 2013 pension cost	7.25%	'	'
Discount rates to determine APBO	4.50%	3.50%	'
Employees minimum contribution to Saving Plan	1.00%	'	'
Employees maximum contribution to Saving Plan	100.00%	'	'
Employer contribution to Saving Plan	6.00%	'	'
Employee contribution to savings plan	10.00%	'	'
Increase in employee contribution to savings plan	1.00%	'	'
Profit sharing allocation	2.00%	2.40%	3.00%
Total expenses associated with Saving Plan	68	68	79
Initial Default Percentage [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Employee contribution to savings plan	2.00%	'	'
Other Postretirement Benefit Plans [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Pre-tax AOCI not yet recognized as net pension cost	-17	-2	'
Pre-tax accumulated other comprehensive loss expected to be recognized as net pension cost	2	'	'
Measurement date	'31st December	'31st December	'
Benefits expected to be paid from all funded and unfunded pension plans/other postretirement plans in 2014	5	'	'
Benefits expected to be paid from all funded and unfunded pension plans/other postretirement plans in 2015	5	'	'
Benefits expected to be paid from all funded and unfunded pension plans/other postretirement plans in 2016	5	'	'
Benefits expected to be paid from all funded and unfunded pension plans/other postretirement plans in 2017	5	'	'
Benefits expected to be paid from all funded and unfunded pension plans/other postretirement plans in 2018	5	'	'
Benefits expected to be paid from all funded and unfunded pension plans/other postretirement plans in 2019 through 2023	23	'	'
Defined benefit plan, net periodic benefit cost expected	'	'	'
Expected return on plan assets	5.25%	5.58%	5.45%
Expected net periodic benefit cost for next fiscal year	'1	'	'
Defined benefit plan net periodic benefit costs	'Less than $1 million	'Less than $1 million	'
Pension Plans [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Pre-tax accumulated other comprehensive loss expected to be recognized as net pension cost	16	'	'
Measurement date	'31st December	'31st December	'
Benefits expected to be paid from all funded and unfunded pension plans/other postretirement plans in 2014	100	'	'
Benefits expected to be paid from all funded and unfunded pension plans/other postretirement plans in 2015	97	'	'
Benefits expected to be paid from all funded and unfunded pension plans/other postretirement plans in 2016	104	'	'
Benefits expected to be paid from all funded and unfunded pension plans/other postretirement plans in 2017	90	'	'
Benefits expected to be paid from all funded and unfunded pension plans/other postretirement plans in 2018	86	'	'
Benefits expected to be paid from all funded and unfunded pension plans/other postretirement plans in 2019 through 2023	386	'	'
Accumulated benefit obligation for all pension plans	1,156	1,277	'
Defined benefit plan, net periodic benefit cost expected	21	-7	-13
Settlement loss	$27	'	'
Expected return on plan assets	7.25%	7.25%	7.75%

Employee_Benefits_Net_Pension_

Employee Benefits - Net Pension Cost and Amount Recognized in OCI for All Funded and Unfunded Plans (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Net pension cost (benefit)	$21	$7	'
Pension Plans [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Interest cost on PBO	42	47	57
Expected return on plan assets	-67	-70	-81
Amortization of losses	19	16	11
Settlement loss	27	'	'
Net pension cost (benefit)	21	-7	-13
Other changes in plan assets and benefit obligations recognized in OCI:	'	'	'
Net (gain) loss	-106	63	120
Amortization of losses	-46	-16	-11
Total recognized in comprehensive income	-152	47	109
Total recognized in net pension cost and comprehensive income	($131)	$40	$96

Employee_Benefits_Changes_in_P

Employee Benefits - Changes in PBO Related to Pension Plans (Detail) (Pension Plans [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Pension Plans [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
PBO/APBO at beginning of year	$1,277	$1,228	'
Interest cost	42	47	57
Actuarial losses (gains)	-54	86	'
Benefit payments	-109	-84	'
PBO/APBO at end of year	$1,156	$1,277	$1,228

Employee_Benefits_Changes_in_F

Employee Benefits - Changes in FVA (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]	'	'
FVA at end of year	$970	$942
Pension Plans [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
FVA at beginning of year	942	918
Actual return on plan assets	119	92
Employer contributions	18	16
Benefit payments	-109	-84
FVA at end of year	$970	$942

Employee_Benefits_Funded_Statu

Employee Benefits - Funded Status of Pension Plans Recognized in Balance Sheets (Detail) (Pension Plans [Member], USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Pension Plans [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Funded status	($186)	($335)
Net prepaid pension cost recognized consists of:	'	'
Current liabilities	-14	-14
Noncurrent liabilities	-172	-321
Net prepaid pension cost recognized	($186)	($335)

Employee_Benefits_Plans_ABO_in

Employee Benefits - Plans ABO in Excess of Plan Assets (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Defined Benefit Plan Disclosure [Line Items]	'	'
ABO	$1,200	$1,300
Pension Plans [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
PBO	1,156	1,277
ABO	1,156	1,277
Fair value of plan assets	$970	$942

Employee_Benefits_WeightedAver

Employee Benefits - Weighted-Average Rates to Determine Actuarial Present Value of Benefit Obligations (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Discount rate	3.25%	4.00%	4.75%
Compensation increase rate	'	'	'
Pension Plans [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Discount rate	4.25%	3.25%	'
Compensation increase rate	'	'	'

Employee_Benefits_WeightedAver1

Employee Benefits - Weighted-Average Rates to Determine Net Pension Cost (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Compensation And Retirement Disclosure [Abstract]	'	'	'
Discount rate	3.25%	4.00%	4.75%
Compensation increase rate	'	'	'
Expected return on plan assets	7.25%	7.25%	7.75%

Employee_Benefits_Asset_Target

Employee Benefits - Asset Target Allocations Prescribed by Pension Funds' Investment Policies (Detail)	12 Months Ended
	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]	'
Total Target Allocation	100.00%
Equity securities [Member]	'
Defined Benefit Plan Disclosure [Line Items]	'
Total Target Allocation	46.00%
Fixed income [Member]	'
Defined Benefit Plan Disclosure [Line Items]	'
Total Target Allocation	28.00%
Convertible securities [Member]	'
Defined Benefit Plan Disclosure [Line Items]	'
Total Target Allocation	5.00%
Other assets [Member]	'
Defined Benefit Plan Disclosure [Line Items]	'
Total Target Allocation	21.00%

Employee_Benefits_Fair_Values_

Employee Benefits - Fair Values of Pension Plan Assets by Asset Category (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	$970	$942
Insurance Investment Contracts and Pooled Separate Accounts [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	13	12
Other Asset [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	62	56
Equity securities [Member] | U.S. Equity [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	216	216
Equity securities [Member] | International Equity [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	24	29
Debt Securities [Member] | Corporate Bonds - U.S. [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	74	73
Debt Securities [Member] | Corporate Bonds - International [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	11	10
Debt Securities [Member] | Government and Agency Bonds - U.S. [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	73	79
Debt Securities [Member] | Government Bonds - International [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	1	3
Debt Securities [Member] | State and Municipal Bonds [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	3	1
Mutual Funds [Member] | U.S. Equity [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	11	13
Mutual Funds [Member] | International Equity [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	34	8
Mutual Funds [Member] | Fixed Income - U.S. [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	3	4
Mutual Funds [Member] | Fixed Income - International [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	2	2
Collective Investment Funds [Member] | U.S. Equity [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	31	24
Collective Investment Funds [Member] | International Equity [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	151	147
Collective Investment Funds [Member] | Fixed Income Securities [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	7	5
Collective Investment Funds [Member] | Short-term Investments [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	44	48
Collective Investment Funds [Member] | Emerging Markets [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	44	47
Collective Investment Funds [Member] | Convertible securities [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	54	47
Collective Investment Funds [Member] | Real Assets [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	112	118
Level 1 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	290	270
Level 1 [Member] | Insurance Investment Contracts and Pooled Separate Accounts [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	'	'
Level 1 [Member] | Other Asset [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	'	'
Level 1 [Member] | Equity securities [Member] | U.S. Equity [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	216	216
Level 1 [Member] | Equity securities [Member] | International Equity [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	24	29
Level 1 [Member] | Debt Securities [Member] | Corporate Bonds - U.S. [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	'	'
Level 1 [Member] | Debt Securities [Member] | Corporate Bonds - International [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	'	'
Level 1 [Member] | Debt Securities [Member] | Government and Agency Bonds - U.S. [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	'	'
Level 1 [Member] | Debt Securities [Member] | Government Bonds - International [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	'	'
Level 1 [Member] | Debt Securities [Member] | State and Municipal Bonds [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	'	'
Level 1 [Member] | Mutual Funds [Member] | U.S. Equity [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	11	13
Level 1 [Member] | Mutual Funds [Member] | International Equity [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	34	6
Level 1 [Member] | Mutual Funds [Member] | Fixed Income - U.S. [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	3	4
Level 1 [Member] | Mutual Funds [Member] | Fixed Income - International [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	2	2
Level 1 [Member] | Collective Investment Funds [Member] | U.S. Equity [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	'	'
Level 1 [Member] | Collective Investment Funds [Member] | International Equity [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	'	'
Level 1 [Member] | Collective Investment Funds [Member] | Fixed Income Securities [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	'	'
Level 1 [Member] | Collective Investment Funds [Member] | Short-term Investments [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	'	'
Level 1 [Member] | Collective Investment Funds [Member] | Emerging Markets [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	'	'
Level 1 [Member] | Collective Investment Funds [Member] | Convertible securities [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	'	'
Level 1 [Member] | Collective Investment Funds [Member] | Real Assets [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	'	'
Level 2 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	605	604
Level 2 [Member] | Insurance Investment Contracts and Pooled Separate Accounts [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	'	'
Level 2 [Member] | Other Asset [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	'	'
Level 2 [Member] | Equity securities [Member] | U.S. Equity [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	'	'
Level 2 [Member] | Equity securities [Member] | International Equity [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	'	'
Level 2 [Member] | Debt Securities [Member] | Corporate Bonds - U.S. [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	74	73
Level 2 [Member] | Debt Securities [Member] | Corporate Bonds - International [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	11	10
Level 2 [Member] | Debt Securities [Member] | Government and Agency Bonds - U.S. [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	73	79
Level 2 [Member] | Debt Securities [Member] | Government Bonds - International [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	1	3
Level 2 [Member] | Debt Securities [Member] | State and Municipal Bonds [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	3	1
Level 2 [Member] | Mutual Funds [Member] | U.S. Equity [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	'	'
Level 2 [Member] | Mutual Funds [Member] | International Equity [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	'	2
Level 2 [Member] | Mutual Funds [Member] | Fixed Income - U.S. [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	'	'
Level 2 [Member] | Mutual Funds [Member] | Fixed Income - International [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	'	'
Level 2 [Member] | Collective Investment Funds [Member] | U.S. Equity [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	31	24
Level 2 [Member] | Collective Investment Funds [Member] | International Equity [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	151	147
Level 2 [Member] | Collective Investment Funds [Member] | Fixed Income Securities [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	7	5
Level 2 [Member] | Collective Investment Funds [Member] | Short-term Investments [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	44	48
Level 2 [Member] | Collective Investment Funds [Member] | Emerging Markets [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	44	47
Level 2 [Member] | Collective Investment Funds [Member] | Convertible securities [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	54	47
Level 2 [Member] | Collective Investment Funds [Member] | Real Assets [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	112	118
Level 3 [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	75	68
Level 3 [Member] | Insurance Investment Contracts and Pooled Separate Accounts [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	13	12
Level 3 [Member] | Other Asset [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	62	56
Level 3 [Member] | Equity securities [Member] | U.S. Equity [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	'	'
Level 3 [Member] | Equity securities [Member] | International Equity [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	'	'
Level 3 [Member] | Debt Securities [Member] | Corporate Bonds - U.S. [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	'	'
Level 3 [Member] | Debt Securities [Member] | Corporate Bonds - International [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	'	'
Level 3 [Member] | Debt Securities [Member] | Government and Agency Bonds - U.S. [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	'	'
Level 3 [Member] | Debt Securities [Member] | Government Bonds - International [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	'	'
Level 3 [Member] | Debt Securities [Member] | State and Municipal Bonds [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	'	'
Level 3 [Member] | Mutual Funds [Member] | U.S. Equity [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	'	'
Level 3 [Member] | Mutual Funds [Member] | International Equity [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	'	'
Level 3 [Member] | Mutual Funds [Member] | Fixed Income - U.S. [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	'	'
Level 3 [Member] | Mutual Funds [Member] | Fixed Income - International [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	'	'
Level 3 [Member] | Collective Investment Funds [Member] | U.S. Equity [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	'	'
Level 3 [Member] | Collective Investment Funds [Member] | International Equity [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	'	'
Level 3 [Member] | Collective Investment Funds [Member] | Fixed Income Securities [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	'	'
Level 3 [Member] | Collective Investment Funds [Member] | Short-term Investments [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	'	'
Level 3 [Member] | Collective Investment Funds [Member] | Emerging Markets [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	'	'
Level 3 [Member] | Collective Investment Funds [Member] | Convertible securities [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	'	'
Level 3 [Member] | Collective Investment Funds [Member] | Real Assets [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Assets at fair value	'	'

Employee_Benefits_Changes_in_F1

Employee Benefits - Changes in Fair Values of Level 3 Plan Assets (Detail) (USD $)

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

In Millions, unless otherwise specified

Level 3 [Member]

Level 3 [Member]

Pension Plans [Member]

Pension Plans [Member]

Pension Plans [Member]

Pension Plans [Member]

Pension Plans [Member]

Insurance Investment Contracts and Pooled Separate Accounts [Member]

Insurance Investment Contracts and Pooled Separate Accounts [Member]

Insurance Investment Contracts and Pooled Separate Accounts [Member]

Insurance Investment Contracts and Pooled Separate Accounts [Member]

Insurance Investment Contracts and Pooled Separate Accounts [Member]

Insurance Investment Contracts and Pooled Separate Accounts [Member]

Other assets [Member]

Other assets [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Pension Plans [Member]

Pension Plans [Member]

Pension Plans [Member]

Pension Plans [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Level 3 [Member]

Defined Benefit Plan Disclosure [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

FVA at beginning of year

$970

$942

$75

$68

$970

$942

$918

$68

$16

$13

$12

$13

$12

$12

$12

$56

$4

Actual return on plan assets:

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Relating to assets held at reporting date

'

'

'

'

'

'

'

7

3

'

'

'

'

1

1

6

2

Relating to assets sold during the period

'

'

'

'

'

'

'

'

-3

'

'

'

'

'

'

'

-3

Purchases

'

'

'

'

'

'

'

'

55

'

'

'

'

'

'

'

55

Sales

'

'

'

'

'

'

'

'

-3

'

'

'

'

'

-1

'

-2

FVA at end of year

$970

$942

$75

$68

$970

$942

$918

$75

$68

$13

$12

$13

$12

$13

$12

$62

$56

Employee_Benefits_Pretax_AOCI_

Employee Benefits - Pre-tax AOCI Not Yet Recognized as Net Postretirement Benefit Cost (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Defined Benefit Plan Disclosure [Line Items]	'	'
Total unrecognized AOCI	$529	$681
Other Postretirement Benefit Plans [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Net unrecognized losses (gains)	-12	5
Net unrecognized prior service benefit	-5	-7
Total unrecognized AOCI	($17)	($2)

Employee_Benefits_Net_Postreti

Employee Benefits - Net Postretirement Benefit Cost and the Amount Recognized in OCI for All Funded and Unfunded Plans (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Net postretirement benefit cost	($21)	($7)	'
Other Postretirement Benefit Plans [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Service cost of benefits earned	1	1	1
Interest cost on APBO	3	3	3
Expected return on plan assets	-3	-3	-3
Amortization of prior service credit	-1	-1	-1
Net postretirement benefit cost	'	'	'
Other changes in plan assets and benefit obligations recognized in OCI:	'	'	'
Net (gain) loss	-17	-3	8
Amortization of prior service credit	1	1	1
Total recognized in comprehensive income	-16	-2	9
Total recognized in net postretirement benefit cost and comprehensive income	($16)	($2)	$9

Employee_Benefits_Changes_in_A

Employee Benefits - Changes in APBO (Detail) (Other Postretirement Benefit Plans [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Other Postretirement Benefit Plans [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
PBO/APBO at beginning of year	$74	$81	'
Service cost	1	1	1
Interest cost	3	3	3
Plan participants' contributions	1	2	'
Actuarial losses (gains)	-6	1	'
Benefit payments	-8	-7	'
Liability (gain)/loss due to settlement	'	-7	'
PBO/APBO at end of year	$65	$74	$81

Employee_Benefits_Change_in_FV

Employee Benefits - Change in FVA (Other Post Retirement Benefit Plan Assets) (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]	'	'
FVA at end of year	$970	$942
Other Postretirement Benefit Plans [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
FVA at beginning of year	51	57
Employer contributions	'	-1
Plan participants' contributions	1	2
Benefit payments	-8	-7
Transfer to insurer	'	-7
Actual return on plan assets	13	7
FVA at end of year	$57	$51

Employee_Benefits_Funded_Statu1

Employee Benefits - Funded Status of Postretirement Plans Recognized in Balance Sheets (Detail) (Other Postretirement Benefit Plans [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Other Postretirement Benefit Plans [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Funded status	($8)	($23)
Accrued postretirement benefit cost recognized	($8)	($23)

Employee_Benefits_WeightedAver2

Employee Benefits - Weighted-Average Rates to Determine Net Postretirement Benefit Cost (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Discount rate	3.25%	4.00%	4.75%
Expected return on plan assets	7.25%	7.25%	7.75%
Other Postretirement Benefit Plans [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Discount rate	3.50%	4.00%	4.75%
Expected return on plan assets	5.25%	5.58%	5.45%

Employee_Benefits_Asset_Target1

Employee Benefits - Asset Target Allocation Ranges Prescribed by Trusts' Investment Policies (Detail)	12 Months Ended
	Dec. 31, 2013
Equity securities [Member]	'
Defined Benefit Plan Disclosure [Line Items]	'
Target Allocation, minimum	70.00%
Target Allocation, maximum	90.00%
Debt Securities [Member]	'
Defined Benefit Plan Disclosure [Line Items]	'
Target Allocation, minimum	0.00%
Target Allocation, maximum	10.00%
Convertible securities [Member]	'
Defined Benefit Plan Disclosure [Line Items]	'
Target Allocation, minimum	0.00%
Target Allocation, maximum	10.00%
Cash Equivalents and Other Assets [Member]	'
Defined Benefit Plan Disclosure [Line Items]	'
Target Allocation, minimum	10.00%
Target Allocation, maximum	30.00%

Employee_Benefits_Fair_Values_1

Employee Benefits - Fair Values of Postretirement Plan Assets by Asset Category (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Millions, unless otherwise specified
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Assets at fair value	$970	$942	'
Level 1 [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Assets at fair value	290	270	'
Level 2 [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Assets at fair value	605	604	'
Level 3 [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Assets at fair value	75	68	'
Other Postretirement Benefit Plans [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Assets at fair value	57	51	57
Other Postretirement Benefit Plans [Member] | Common Investment Funds [Member] | U.S. Equity [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Assets at fair value	29	26	'
Other Postretirement Benefit Plans [Member] | Common Investment Funds [Member] | International Equity [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Assets at fair value	9	8	'
Other Postretirement Benefit Plans [Member] | Common Investment Funds [Member] | Convertible securities [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Assets at fair value	3	4	'
Other Postretirement Benefit Plans [Member] | Common Investment Funds [Member] | Short-term investments [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Assets at fair value	8	4	'
Other Postretirement Benefit Plans [Member] | Common Investment Funds [Member] | Fixed income [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Assets at fair value	2	2	'
Other Postretirement Benefit Plans [Member] | Mutual Funds [Member] | U.S. Equity [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Assets at fair value	6	7	'
Other Postretirement Benefit Plans [Member] | Level 1 [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Assets at fair value	6	7	'
Other Postretirement Benefit Plans [Member] | Level 1 [Member] | Common Investment Funds [Member] | U.S. Equity [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Assets at fair value	'	'	'
Other Postretirement Benefit Plans [Member] | Level 1 [Member] | Common Investment Funds [Member] | International Equity [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Assets at fair value	'	'	'
Other Postretirement Benefit Plans [Member] | Level 1 [Member] | Common Investment Funds [Member] | Convertible securities [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Assets at fair value	'	'	'
Other Postretirement Benefit Plans [Member] | Level 1 [Member] | Common Investment Funds [Member] | Short-term investments [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Assets at fair value	'	'	'
Other Postretirement Benefit Plans [Member] | Level 1 [Member] | Common Investment Funds [Member] | Fixed income [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Assets at fair value	'	'	'
Other Postretirement Benefit Plans [Member] | Level 1 [Member] | Mutual Funds [Member] | U.S. Equity [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Assets at fair value	6	7	'
Other Postretirement Benefit Plans [Member] | Level 2 [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Assets at fair value	51	44	'
Other Postretirement Benefit Plans [Member] | Level 2 [Member] | Common Investment Funds [Member] | U.S. Equity [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Assets at fair value	29	26	'
Other Postretirement Benefit Plans [Member] | Level 2 [Member] | Common Investment Funds [Member] | International Equity [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Assets at fair value	9	8	'
Other Postretirement Benefit Plans [Member] | Level 2 [Member] | Common Investment Funds [Member] | Convertible securities [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Assets at fair value	3	4	'
Other Postretirement Benefit Plans [Member] | Level 2 [Member] | Common Investment Funds [Member] | Short-term investments [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Assets at fair value	8	4	'
Other Postretirement Benefit Plans [Member] | Level 2 [Member] | Common Investment Funds [Member] | Fixed income [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Assets at fair value	2	2	'
Other Postretirement Benefit Plans [Member] | Level 2 [Member] | Mutual Funds [Member] | U.S. Equity [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Assets at fair value	'	'	'
Other Postretirement Benefit Plans [Member] | Level 3 [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Assets at fair value	'	'	'
Other Postretirement Benefit Plans [Member] | Level 3 [Member] | Common Investment Funds [Member] | U.S. Equity [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Assets at fair value	'	'	'
Other Postretirement Benefit Plans [Member] | Level 3 [Member] | Common Investment Funds [Member] | International Equity [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Assets at fair value	'	'	'
Other Postretirement Benefit Plans [Member] | Level 3 [Member] | Common Investment Funds [Member] | Convertible securities [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Assets at fair value	'	'	'
Other Postretirement Benefit Plans [Member] | Level 3 [Member] | Common Investment Funds [Member] | Short-term investments [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Assets at fair value	'	'	'
Other Postretirement Benefit Plans [Member] | Level 3 [Member] | Common Investment Funds [Member] | Fixed income [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Assets at fair value	'	'	'
Other Postretirement Benefit Plans [Member] | Level 3 [Member] | Mutual Funds [Member] | U.S. Equity [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Assets at fair value	'	'	'

ShortTerm_Borrowings_Component

Short-Term Borrowings - Components of Short-Term Borrowings (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Standby Letters of Credit [Line Items]	'	'	'
Balance at year end, Federal Funds Purchase	$18	$8	$25
Balance at year end, Securities Sold Under Repurchase Agreements	1,516	1,601	1,686
Balance at year end, Other Short-Term Borrowings	343	287	337
Federal Funds Purchased [Member]	'	'	'
Standby Letters of Credit [Line Items]	'	'	'
Average during the year	164	111	120
Maximum month-end balance	1,486	613	844
Weighted-average rate during the year	0.09%	0.14%	0.13%
Weighted-average rate at December 31	0.10%	0.15%	0.08%
Securities Sold under Agreements to Repurchase [Member]	'	'	'
Standby Letters of Credit [Line Items]	'	'	'
Average during the year	1,638	1,703	1,861
Maximum month-end balance	2,099	2,455	2,286
Weighted-average rate during the year	0.13%	0.19%	0.28%
Weighted-average rate at December 31	0.15%	0.14%	0.25%
Other Short Term Borrowings [Member]	'	'	'
Standby Letters of Credit [Line Items]	'	'	'
Average during the year	394	413	619
Maximum month-end balance	$466	$599	$1,007
Weighted-average rate during the year	1.89%	1.69%	1.84%
Weighted-average rate at December 31	2.00%	1.81%	1.60%

ShortTerm_Borrowings_Additiona

Short-Term Borrowings - Additional Information (Detail) (USD $)	Dec. 31, 2013
In Billions, unless otherwise specified
Standby Letters of Credit [Line Items]	'
Deposits with the Federal Reserve	$4.60
Federal Reserve Bank of Cleveland [Member]	'
Standby Letters of Credit [Line Items]	'
Unused Secured borrowing capacity	15.5
Federal Home Loan Bank of Cincinnati [Member]	'
Standby Letters of Credit [Line Items]	'
Unused Secured borrowing capacity	$3.50

LongTerm_Debt_Components_of_Lo

Long-Term Debt - Components of Long-Term Debt (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Debt Instrument [Line Items]	'	'
Total long-term debt	$7,650	$6,847
Senior medium-term notes due through 2021 [Member]	'	'
Debt Instrument [Line Items]	'	'
Senior medium-term notes	2,553	2,653
1.100% Subordinated notes due 2028 [Member]	'	'
Debt Instrument [Line Items]	'	'
Subordinated long-term notes	162	162
6.875% Subordinated notes due 2029 [Member]	'	'
Debt Instrument [Line Items]	'	'
Subordinated long-term notes	103	117
7.750% Subordinated notes due 2029 [Member]	'	'
Debt Instrument [Line Items]	'	'
Subordinated long-term notes	133	152
Senior medium-term notes due through 2039 [Member]	'	'
Debt Instrument [Line Items]	'	'
Senior medium-term notes	1,858	129
Senior Euro medium-term notes due through 2013 [Member]	'	'
Debt Instrument [Line Items]	'	'
Senior medium-term notes	'	26
7.413% Subordinated remarketable notes due 2027 [Member]	'	'
Debt Instrument [Line Items]	'	'
Subordinated long-term notes	270	268
5.80% Subordinated notes due 2014 [Member]	'	'
Debt Instrument [Line Items]	'	'
Subordinated long-term notes	768	803
4.95% Subordinated notes due 2015 [Member]	'	'
Debt Instrument [Line Items]	'	'
Subordinated long-term notes	251	251
5.45% Subordinated notes due 2016 [Member]	'	'
Debt Instrument [Line Items]	'	'
Subordinated long-term notes	544	564
5.70% Subordinated notes due 2017 [Member]	'	'
Debt Instrument [Line Items]	'	'
Subordinated long-term notes	229	241
4.625% Subordinated notes due 2018 [Member]	'	'
Debt Instrument [Line Items]	'	'
Subordinated long-term notes	104	108
6.95% Subordinated notes due 2028 [Member]	'	'
Debt Instrument [Line Items]	'	'
Subordinated long-term notes	298	300
Lease financing debt due through 2016 [Member]	'	'
Debt Instrument [Line Items]	'	'
Lease financing debt due through 2016	5	9
Secured borrowings due through 2018 [Member]	'	'
Debt Instrument [Line Items]	'	'
Secured borrowings due through 2018	58	'
Federal Home Loan Bank [Member]	'	'
Debt Instrument [Line Items]	'	'
Federal Home Loan Bank advances due through 2036	224	974
Investment Fund Financing [Member]	'	'
Debt Instrument [Line Items]	'	'
Investment Fund Financing due through 2052	90	90
Parent Company [Member]	'	'
Debt Instrument [Line Items]	'	'
Total long-term debt	2,951	3,084
Subsidiaries [Member]	'	'
Debt Instrument [Line Items]	'	'
Total long-term debt	$4,699	$3,763

LongTerm_Debt_Components_of_Lo1

Long-Term Debt - Components of Long-Term Debt (Parenthetical) (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
	Note
Debt Instrument [Line Items]	'	'
Real Estate Loans and securities pledged	337	1,600
Senior medium-term notes due through 2021 [Member]	'	'
Debt Instrument [Line Items]	'	'
Debt instrument maturity, year	'2021	'
Long-term debt weighted average interest rate	3.89%	5.11%
Number of notes	3	'
Senior medium-term notes due through 2021 [Member] | Redeemable one month prior to maturity [Member]	'	'
Debt Instrument [Line Items]	'	'
Number of notes	1	'
Senior medium-term notes due through 2021 [Member] | Redeemable Notes [Member]	'	'
Debt Instrument [Line Items]	'	'
Number of notes	2	'
1.100% Subordinated notes due 2028 [Member]	'	'
Debt Instrument [Line Items]	'	'
Debt instrument maturity, year	'2028	'
Debt instrument interest rate	0.99%	'
6.875% Subordinated notes due 2029 [Member]	'	'
Debt Instrument [Line Items]	'	'
Debt instrument maturity, year	'2029	'
Debt instrument interest rate	6.88%	'
7.750% Subordinated notes due 2029 [Member]	'	'
Debt Instrument [Line Items]	'	'
Debt instrument maturity, year	'2029	'
Debt instrument interest rate	7.75%	'
Senior medium-term notes due through 2039 [Member]	'	'
Debt Instrument [Line Items]	'	'
Debt instrument maturity, year	'2039	'
Long-term debt weighted average interest rate	1.58%	5.03%
Number of notes	5	'
Senior medium-term notes due through 2039 [Member] | Redeemable one month prior to maturity [Member]	'	'
Debt Instrument [Line Items]	'	'
Number of notes	2	'
Senior medium-term notes due through 2039 [Member] | Redeemable Notes [Member]	'	'
Debt Instrument [Line Items]	'	'
Number of notes	3	'
Senior Euro medium-term notes due through 2013 [Member]	'	'
Debt Instrument [Line Items]	'	'
Debt instrument maturity, year	'2013	'
Long-term debt weighted average interest rate	'	0.64%
7.413% Subordinated remarketable notes due 2027 [Member]	'	'
Debt Instrument [Line Items]	'	'
Debt instrument maturity, year	'2027	'
Debt instrument interest rate	7.41%	'
5.80% Subordinated notes due 2014 [Member]	'	'
Debt Instrument [Line Items]	'	'
Debt instrument maturity, year	'2014	'
Debt instrument interest rate	5.80%	'
4.95% Subordinated notes due 2015 [Member]	'	'
Debt Instrument [Line Items]	'	'
Debt instrument maturity, year	'2015	'
Debt instrument interest rate	4.95%	'
5.45% Subordinated notes due 2016 [Member]	'	'
Debt Instrument [Line Items]	'	'
Debt instrument maturity, year	'2016	'
Debt instrument interest rate	5.45%	'
5.70% Subordinated notes due 2017 [Member]	'	'
Debt Instrument [Line Items]	'	'
Debt instrument maturity, year	'2017	'
Debt instrument interest rate	5.70%	'
4.625% Subordinated notes due 2018 [Member]	'	'
Debt Instrument [Line Items]	'	'
Debt instrument maturity, year	'2018	'
Debt instrument interest rate	4.63%	'
6.95% Subordinated notes due 2028 [Member]	'	'
Debt Instrument [Line Items]	'	'
Debt instrument maturity, year	'2028	'
Debt instrument interest rate	6.95%	'
Lease financing debt due through 2016 [Member]	'	'
Debt Instrument [Line Items]	'	'
Debt instrument maturity, year	'2016	'
Long-term debt weighted average interest rate	5.99%	6.20%
Secured borrowings due through 2018 [Member]	'	'
Debt Instrument [Line Items]	'	'
Debt instrument maturity, year	'2018	'
Federal Home Loan Bank [Member]	'	'
Debt Instrument [Line Items]	'	'
Debt instrument maturity, year	'2036	'
Long-term debt weighted average interest rate	3.47%	1.09%
Investment Fund Financing [Member]	'	'
Debt Instrument [Line Items]	'	'
Debt instrument maturity, year	'2052	'
Long-term debt weighted average interest rate	2.01%	2.01%
Secured Debt [Member]	'	'
Debt Instrument [Line Items]	'	'
Long-term debt weighted average interest rate	4.79%	'

LongTerm_Debt_Scheduled_Princi

Long-Term Debt - Scheduled Principal Payments on Long-term Debt (Detail) (USD $)	Dec. 31, 2013
In Millions, unless otherwise specified
Debt Instrument [Line Items]	'
2014	$816
2015	1,270
2016	1,243
2017	255
2018	1,840
All subsequent years	2,226
Parent Company [Member]	'
Debt Instrument [Line Items]	'
2014	'
2015	764
2016	'
2017	'
2018	739
All subsequent years	1,448
Subsidiaries [Member]	'
Debt Instrument [Line Items]	'
2014	816
2015	506
2016	1,243
2017	255
2018	1,101
All subsequent years	$778

LongTerm_Debt_Additional_Infor

Long-Term Debt - Additional Information (Detail) (USD $)	12 Months Ended			0 Months Ended			12 Months Ended
	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013	Feb. 01, 2013	Nov. 26, 2013	Nov. 13, 2013	Dec. 31, 2013
		Senior Notes [Member]	Subordinated Notes [Member]	1.65% Senior Bank Notes due February 1, 2018 [Member]	1.10% Senior Notes due November 25, 2016 [Member]	Medium-Term Notes [Member]	Medium-Term Notes [Member]
Debt Instrument [Line Items]	'	'	'	'	'	'	'
Bank note, maximum issuable amount	$20,000,000,000	'	'	'	'	'	'
Original maturity of bank note	'	'7 days	'5 years	'	'	'	'
Issuance of senior bank notes	'	'	'	1,000,000,000	'	'	'
Debt instrument maturity date	'	'	'	1-Feb-18	25-Nov-16	'	'
Debt instrument interest rate	'	'	'	1.65%	1.10%	'	'
Issuance of senior notes	'	'	'	'	350,000,000	'	'
Issuance of floating rate senior notes	'	'	'	'	400,000,000	'	'
Senior notes available for future issuance	18,250,000,000	'	'	'	'	'	'
Issuance of euro medium-term notes original maturities	'	'	'	'	'	'	'Nine months or more
Issuance of medium-term notes	'	'	'	'	'	750,000,000	'
Additional debt securities authorized and available for issuance under note program	'	'	'	'	'	'	$875,000,000
Coupon rate of medium-term notes	'	'	'	'	'	2.30%	'

Trust_Preferred_Securities_Iss2

Trust Preferred Securities Issued by Unconsolidated Subsidiaries - Additional Information (Detail) (USD $)	Dec. 31, 2013
In Millions, unless otherwise specified
Trust Preferred Securities [Abstract]	'
Percentage of trust preferred securities issued by the KeyCorp of Tier 1 capital	3.40%
Trust preferred securities issued by the KeyCorp of Tier 1 capital	$339

Trust_Preferred_Securities_Iss3

Trust Preferred Securities Issued by Unconsolidated Subsidiaries - Summary of Trust Preferred Securities, Common Stock and Related Debentures (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]	'	'
Common Stock	$1,017	$1,017
KeyCorp Capital I [Member]	'	'
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]	'	'
Trust Preferred Securities, Net of Discount	156	'
Common Stock	6	'
Principal Amount of Debentures, Net of Discount	162	'
Interest Rate of Trust Preferred Securities and Debentures	0.99%	'
Maturity of Trust Preferred Securities and Debentures	'2028	'
KeyCorp Capital II [Member]	'	'
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]	'	'
Trust Preferred Securities, Net of Discount	99	'
Common Stock	4	'
Principal Amount of Debentures, Net of Discount	103	'
Interest Rate of Trust Preferred Securities and Debentures	6.88%	'
Maturity of Trust Preferred Securities and Debentures	'2029	'
KeyCorp Capital III [Member]	'	'
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]	'	'
Trust Preferred Securities, Net of Discount	129	'
Common Stock	4	'
Principal Amount of Debentures, Net of Discount	133	'
Interest Rate of Trust Preferred Securities and Debentures	7.75%	'
Maturity of Trust Preferred Securities and Debentures	'2029	'
Business Trusts [Member]	'	'
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]	'	'
Trust Preferred Securities, Net of Discount	384	417
Common Stock	14	14
Principal Amount of Debentures, Net of Discount	$398	$431
Interest Rate of Trust Preferred Securities and Debentures	4.78%	5.03%

Trust_Preferred_Securities_Iss4

Trust Preferred Securities Issued by Unconsolidated Subsidiaries - Summary of Trust Preferred Securities, Common Stock and Related Debentures (Parenthetical) (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]	'	'
Trust preferred securities adjustments related to fair value hedges	$44	$77
Redemption price as the sum of the present values of principal and interest payments, if redeemed before maturity	'The greater of: (a)B the principal amount, plus any accrued but unpaid interest, or (b)B 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.	'
Debentures adjustments related to financial instrument hedging	$44	$77
KeyCorp Capital I [Member]	'	'
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]	'	'
Floating interest rate	'KeyCorp Capital I has a floating interest rate, equal to three-month LIBOR plus 74 basis points that reprices quarterly.	'
Floating interest rate equal to three-month LIBOR plus percentage	0.74%	'

Commitments_Contingent_Liabili2

Commitments, Contingent Liabilities and Guarantees - Additional Information (Detail) (USD $)	0 Months Ended	12 Months Ended
	Dec. 21, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
	Plaintiff
Commitments Contingencies and Guarantees [Line Items]	'	'	'	'
Rental expense under all operating leases	'	$122,000,000	$121,000,000	$120,000,000
Minimum future rental payments under noncancelable operating leases due in 2014	'	120,000,000	'	'
Minimum future rental payments under noncancelable operating leases due in 2015	'	114,000,000	'	'
Minimum future rental payments under noncancelable operating leases due in 2016	'	95,000,000	'	'
Minimum future rental payments under noncancelable operating leases due in 2017	'	87,000,000	'	'
Minimum future rental payments under noncancelable operating leases due in 2018	'	71,000,000	'	'
Minimum future rental payments under noncancelable operating leases, all subsequent years	'	411,000,000	'	'
Investment losses of Austin, an investment subsidiary, max limit	'	186,000,000	'	'
Number of plaintiffs' claims	16	'	'	'
Number of plaintiffs' claims, dismissed	14	'	'	'
Number of plaintiffs' claims, pending	2	'	'	'
Weighted-average remaining term for outstanding commercial mortgage loans in years	'	'7 years 2 months 12 days	'	'
Unpaid principal balance outstanding of loans sold	'	4,200,000,000	'	'
Potential undiscounted future payments maximum limit	'	'One-third of the principal balance of loans outstanding	'	'
Obligations under guarantees	'	105,000,000	'	'
Standby Letters of Credit [Member]	'	'	'	'
Commitments Contingencies and Guarantees [Line Items]	'	'	'	'
Remaining weighted-average life of standby letters of credit in years	'	'3 years 2 months 12 days	'	'
Remaining actual life letters of credit in years	'	'From less than one year to as many as eleven years	'	'
Obligations under guarantees	'	72,000,000	'	'
Return Guarantee Agreement with LIHTC Investors [Member]	'	'	'	'
Commitments Contingencies and Guarantees [Line Items]	'	'	'	'
Compliance period of property	'	'15 years	'	'
Obligations under guarantees	'	11,000,000	'	'
Expiration of guarantees	'	'Extend through 2018	'	'
Written Put Options [Member]	'	'	'	'
Commitments Contingencies and Guarantees [Line Items]	'	'	'	'
Obligations under guarantees	'	$22,000,000	'	'
Weighted average life of written put options	'	'2 years 2 months 12 days	'	'
Default Guarantees [Member]	'	'	'	'
Commitments Contingencies and Guarantees [Line Items]	'	'	'	'
Terms of default guarantees range	'	'From less than one year to as many as 5.5 years	'	'
Minimum [Member] | Low [Member]	'	'	'	'
Commitments Contingencies and Guarantees [Line Items]	'	'	'	'
Guarantee Obligations	'	0.00%	'	'
Minimum [Member] | Moderate [Member]	'	'	'	'
Commitments Contingencies and Guarantees [Line Items]	'	'	'	'
Guarantee Obligations	'	31.00%	'	'
Minimum [Member] | High [Member]	'	'	'	'
Commitments Contingencies and Guarantees [Line Items]	'	'	'	'
Guarantee Obligations	'	71.00%	'	'
Maximum [Member] | Low [Member]	'	'	'	'
Commitments Contingencies and Guarantees [Line Items]	'	'	'	'
Guarantee Obligations	'	30.00%	'	'
Maximum [Member] | Moderate [Member]	'	'	'	'
Commitments Contingencies and Guarantees [Line Items]	'	'	'	'
Guarantee Obligations	'	70.00%	'	'
Maximum [Member] | High [Member]	'	'	'	'
Commitments Contingencies and Guarantees [Line Items]	'	'	'	'
Guarantee Obligations	'	100.00%	'	'

Commitments_Contingent_Liabili3

Commitments, Contingent Liabilities and Guarantees - Commitments to Extend Credit or Funding (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Guarantor Obligations [Line Items]	'	'
Total loan commitments	$36,365	$33,207
When-issued and to be announced securities commitments	140	96
Commercial letters of credit	119	100
Principal investing commitments	75	94
Liabilities of certain limited partnerships and other commitments	2	5
Total loan and other commitments	36,701	33,502
Commercial and other [Member]	'	'
Guarantor Obligations [Line Items]	'	'
Total loan commitments	23,611	20,804
Commercial real estate and construction [Member]	'	'
Guarantor Obligations [Line Items]	'	'
Total loan commitments	2,104	1,537
Home Equity [Member]	'	'
Guarantor Obligations [Line Items]	'	'
Total loan commitments	7,193	7,255
Credit Cards [Member]	'	'
Guarantor Obligations [Line Items]	'	'
Total loan commitments	$3,457	$3,611

Commitments_Contingent_Liabili4

Commitments, Contingent Liabilities and Guarantees - Guarantees (Detail) (USD $)	Dec. 31, 2013
In Millions, unless otherwise specified
Guarantor Obligations [Line Items]	'
Maximum Potential Undiscounted Future Payments	$14,742
Liability Recorded	105
Standby Letters of Credit [Member]	'
Guarantor Obligations [Line Items]	'
Maximum Potential Undiscounted Future Payments	10,630
Liability Recorded	72
Recourse Agreement with FNMA [Member]	'
Guarantor Obligations [Line Items]	'
Maximum Potential Undiscounted Future Payments	1,360
Liability Recorded	'
Return Guarantee Agreement with LIHTC Investors [Member]	'
Guarantor Obligations [Line Items]	'
Maximum Potential Undiscounted Future Payments	11
Liability Recorded	11
Written Put Options [Member]	'
Guarantor Obligations [Line Items]	'
Maximum Potential Undiscounted Future Payments	2,741
Liability Recorded	$22

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Income - Changes in AOCI (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013
Accumulated Comprehensive Income Loss [Line Items]	'
Beginning balance	($124)
Other comprehensive income before reclassification, net of income taxes	-216
Amounts reclassified from accumulated other comprehensive income, net of income taxes	-12
Net current-period other comprehensive income, net of income taxes	-228
Ending balance	-352
Unrealized Gains (Losses) on Available for Sale Securities [Member]	'
Accumulated Comprehensive Income Loss [Line Items]	'
Beginning balance	229
Other comprehensive income before reclassification, net of income taxes	-291
Amounts reclassified from accumulated other comprehensive income, net of income taxes	-1
Net current-period other comprehensive income, net of income taxes	-292
Ending balance	-63
Unrealized Gains (Losses) on Derivative Financial Instruments [Member]	'
Accumulated Comprehensive Income Loss [Line Items]	'
Beginning balance	18
Other comprehensive income before reclassification, net of income taxes	6
Amounts reclassified from accumulated other comprehensive income, net of income taxes	-35
Net current-period other comprehensive income, net of income taxes	-29
Ending balance	-11
Foreign Currency Translation Adjustment [Member]	'
Accumulated Comprehensive Income Loss [Line Items]	'
Beginning balance	55
Other comprehensive income before reclassification, net of income taxes	-9
Amounts reclassified from accumulated other comprehensive income, net of income taxes	-4
Net current-period other comprehensive income, net of income taxes	-13
Ending balance	42
Net Pension and Postretirement Benefit Costs [Member]	'
Accumulated Comprehensive Income Loss [Line Items]	'
Beginning balance	-426
Other comprehensive income before reclassification, net of income taxes	78
Amounts reclassified from accumulated other comprehensive income, net of income taxes	28
Net current-period other comprehensive income, net of income taxes	106
Ending balance	($320)

Accumulated_Other_Comprehensiv3

Accumulated Other Comprehensive Income - Reclassifications Out of AOCI (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013
Accumulated Comprehensive Income Loss [Line Items]	'
Amount Reclassified from Accumulated Other Comprehensive Income	$12
Total Before Income Taxes [Member]	'
Accumulated Comprehensive Income Loss [Line Items]	'
Amount Reclassified from Accumulated Other Comprehensive Income	56
Affected Line Item in the Statement Where Net Income is Presented	'Income (loss) from continuing operations before income taxes
Net of Income Taxes [Member]	'
Accumulated Comprehensive Income Loss [Line Items]	'
Amount Reclassified from Accumulated Other Comprehensive Income	35
Affected Line Item in the Statement Where Net Income is Presented	'Income (loss) from continuing operations
Income Taxes [Member]	'
Accumulated Comprehensive Income Loss [Line Items]	'
Amount Reclassified from Accumulated Other Comprehensive Income	21
Affected Line Item in the Statement Where Net Income is Presented	'Income taxes
Realized Gain [Member] | Other Income [Member]	'
Accumulated Comprehensive Income Loss [Line Items]	'
Amount Reclassified from Accumulated Other Comprehensive Income	1
Affected Line Item in the Statement Where Net Income is Presented	'Other income
Realized Gain [Member] | Total Before Income Taxes [Member]	'
Accumulated Comprehensive Income Loss [Line Items]	'
Amount Reclassified from Accumulated Other Comprehensive Income	1
Affected Line Item in the Statement Where Net Income is Presented	'Income (loss) from continuing operations before income taxes
Realized Gain [Member] | Income Tax [Member]	'
Accumulated Comprehensive Income Loss [Line Items]	'
Affected Line Item in the Statement Where Net Income is Presented	'Income taxes
Realized Gain [Member] | Net of Income Taxes [Member]	'
Accumulated Comprehensive Income Loss [Line Items]	'
Amount Reclassified from Accumulated Other Comprehensive Income	1
Affected Line Item in the Statement Where Net Income is Presented	'Income (loss) from continuing operations
Interest Rate [Member] | Interest Income [Member]	'
Accumulated Comprehensive Income Loss [Line Items]	'
Amount Reclassified from Accumulated Other Comprehensive Income	67
Affected Line Item in the Statement Where Net Income is Presented	'Interest income - Loans
Interest Rate [Member] | Interest Expense [Member]	'
Accumulated Comprehensive Income Loss [Line Items]	'
Amount Reclassified from Accumulated Other Comprehensive Income	-8
Affected Line Item in the Statement Where Net Income is Presented	'Interest expense - Long term debt
Foreign Exchange [Member] | Other Income [Member]	'
Accumulated Comprehensive Income Loss [Line Items]	'
Amount Reclassified from Accumulated Other Comprehensive Income	-3
Affected Line Item in the Statement Where Net Income is Presented	'Other income
Foreign Currency Translation Adjustments [Member] | Total Before Income Taxes [Member]	'
Accumulated Comprehensive Income Loss [Line Items]	'
Amount Reclassified from Accumulated Other Comprehensive Income	7
Affected Line Item in the Statement Where Net Income is Presented	'Income (loss) from continuing operations before income taxes
Foreign Currency Translation Adjustments [Member] | Net of Income Taxes [Member]	'
Accumulated Comprehensive Income Loss [Line Items]	'
Amount Reclassified from Accumulated Other Comprehensive Income	4
Affected Line Item in the Statement Where Net Income is Presented	'Income (loss) from continuing operations
Foreign Currency Translation Adjustments [Member] | Income Taxes [Member]	'
Accumulated Comprehensive Income Loss [Line Items]	'
Amount Reclassified from Accumulated Other Comprehensive Income	3
Affected Line Item in the Statement Where Net Income is Presented	'Income taxes
Foreign Currency Translation Adjustments [Member] | Corporate Services Income [Member]	'
Accumulated Comprehensive Income Loss [Line Items]	'
Amount Reclassified from Accumulated Other Comprehensive Income	7
Affected Line Item in the Statement Where Net Income is Presented	'Corporate services income
Pension And Other Postretirement Benefit Plan Cost [Member] | Total Before Income Taxes [Member]	'
Accumulated Comprehensive Income Loss [Line Items]	'
Amount Reclassified from Accumulated Other Comprehensive Income	-45
Affected Line Item in the Statement Where Net Income is Presented	'Income (loss) from continuing operations before income taxes
Pension And Other Postretirement Benefit Plan Cost [Member] | Income Tax [Member]	'
Accumulated Comprehensive Income Loss [Line Items]	'
Amount Reclassified from Accumulated Other Comprehensive Income	-17
Affected Line Item in the Statement Where Net Income is Presented	'Income taxes
Pension And Other Postretirement Benefit Plan Cost [Member] | Net of Income Taxes [Member]	'
Accumulated Comprehensive Income Loss [Line Items]	'
Amount Reclassified from Accumulated Other Comprehensive Income	-28
Affected Line Item in the Statement Where Net Income is Presented	'Income (loss) from continuing operations
Pension And Other Postretirement Benefit Plan Cost [Member] | Amortization of Losses [Member]	'
Accumulated Comprehensive Income Loss [Line Items]	'
Amount Reclassified from Accumulated Other Comprehensive Income	-46
Affected Line Item in the Statement Where Net Income is Presented	'Personnel expense
Pension And Other Postretirement Benefit Plan Cost [Member] | Amortization of Prior Service Credit [Member]	'
Accumulated Comprehensive Income Loss [Line Items]	'
Amount Reclassified from Accumulated Other Comprehensive Income	$1
Affected Line Item in the Statement Where Net Income is Presented	'Personnel expense

Shareholders_Equity_Additional

Shareholders' Equity - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2012
		2013 Capital Plan [Member]	2012 Capital Plan [Member]	KeyBank (consolidated) [Member]	KeyBank (consolidated) [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]	'	'	'	'	'
Stock repurchase program authorized amount	$426	'	'	'	'
Repurchase of common stock	474	409	65	'	'
Proceeds from sale of Victory	$72	'	'	'	'
Total Capital to Net Risk-Weighted Assets, to Qualify as Well Capitalized Under Federal Deposit Insurance Act, Ratio	'	'	'	10.00%	10.00%
Tier 1 Capital to Net Risk-Weighted Assets, to Qualify as Well Capitalized Under Federal Deposit Insurance Act, Ratio	'	'	'	6.00%	6.00%
Tier 1 Capital to Average Quarterly Tangible Assets to Qualify as Well Capitalized Under Federal Deposit Insurance Act, Ratio	'	'	'	5.00%	5.00%

Shareholders_Equity_Keys_and_K

Shareholders' Equity - Key's and KeyBank's Actual Capital Amounts and Ratios, Minimum Capital Amounts and Ratios (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Key [Member]	'	'
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]	'	'
Total Capital to Net Risk-Weighted Assets, Actual Amount	$11,941	$12,066
Tier 1 Capital to Net Risk-Weighted Assets, Actual Amount	9,968	9,689
Tier 1 Capital to Average Quarterly Tangible Assets, Amount	9,968	9,689
Total Capital to Net Risk-Weighted Assets, Actual Ratio	14.33%	15.13%
Tier 1 Capital to Net Risk-Weighted Assets, Actual Ratio	11.96%	12.15%
Tier 1 Capital to Average Quarterly Tangible Assets, Actual Ratio	11.11%	11.41%
Total Capital to Net Risk-Weighted Assets, to Meet Minimum Capital Adequacy Requirements, Amount	6,666	6,379
Tier 1 Capital to Net Risk-Weighted Assets, to Meet Minimum Capital Adequacy Requirements, Amount	3,333	3,189
Tier 1 Capital to Average Quarterly Tangible Assets to Meet Minimum Capital Adequacy Requirements, Amount	2,691	2,547
Total Capital to Net Risk-Weighted Assets, to Meet Minimum Capital Adequacy Requirements, Ratio	8.00%	8.00%
Tier 1 Capital to Net Risk-Weighted Assets, to Meet Minimum Capital Adequacy Requirements, Ratio	4.00%	4.00%
Tier 1 Capital to Average Quarterly Tangible Assets to Meet Minimum Capital Adequacy Requirements, Ratio	3.00%	3.00%
Total Capital to Net Risk-Weighted Assets, to Qualify as Well Capitalized Under Federal Deposit Insurance Act, Amount	'	'
Tier 1 Capital to Net Risk-Weighted Assets, to Qualify as Well Capitalized Under Federal Deposit Insurance Act, Amount	'	'
Tier 1 Capital to Average Quarterly Tangible Assets to Qualify as Well Capitalized Under Federal Deposit Insurance Act, Amount	'	'
Total Capital to Net Risk-Weighted Assets, to Qualify as Well Capitalized Under Federal Deposit Insurance Act, Ratio	'	'
Tier 1 Capital to Net Risk-Weighted Assets, to Qualify as Well Capitalized Under Federal Deposit Insurance Act, Ratio	'	'
Tier 1 Capital to Average Quarterly Tangible Assets to Qualify as Well Capitalized Under Federal Deposit Insurance Act, Ratio	'	'
KeyBank (consolidated) [Member]	'	'
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]	'	'
Total Capital to Net Risk-Weighted Assets, Actual Amount	10,451	10,321
Tier 1 Capital to Net Risk-Weighted Assets, Actual Amount	8,496	7,989
Tier 1 Capital to Average Quarterly Tangible Assets, Amount	8,496	7,989
Total Capital to Net Risk-Weighted Assets, Actual Ratio	13.33%	13.73%
Tier 1 Capital to Net Risk-Weighted Assets, Actual Ratio	10.83%	10.63%
Tier 1 Capital to Average Quarterly Tangible Assets, Actual Ratio	9.69%	9.69%
Total Capital to Net Risk-Weighted Assets, to Meet Minimum Capital Adequacy Requirements, Amount	6,273	6,013
Tier 1 Capital to Net Risk-Weighted Assets, to Meet Minimum Capital Adequacy Requirements, Amount	3,136	3,006
Tier 1 Capital to Average Quarterly Tangible Assets to Meet Minimum Capital Adequacy Requirements, Amount	3,507	3,299
Total Capital to Net Risk-Weighted Assets, to Meet Minimum Capital Adequacy Requirements, Ratio	8.00%	8.00%
Tier 1 Capital to Net Risk-Weighted Assets, to Meet Minimum Capital Adequacy Requirements, Ratio	4.00%	4.00%
Tier 1 Capital to Average Quarterly Tangible Assets to Meet Minimum Capital Adequacy Requirements, Ratio	4.00%	4.00%
Total Capital to Net Risk-Weighted Assets, to Qualify as Well Capitalized Under Federal Deposit Insurance Act, Amount	7,841	7,516
Tier 1 Capital to Net Risk-Weighted Assets, to Qualify as Well Capitalized Under Federal Deposit Insurance Act, Amount	4,705	4,510
Tier 1 Capital to Average Quarterly Tangible Assets to Qualify as Well Capitalized Under Federal Deposit Insurance Act, Amount	$4,384	$4,124
Total Capital to Net Risk-Weighted Assets, to Qualify as Well Capitalized Under Federal Deposit Insurance Act, Ratio	10.00%	10.00%
Tier 1 Capital to Net Risk-Weighted Assets, to Qualify as Well Capitalized Under Federal Deposit Insurance Act, Ratio	6.00%	6.00%
Tier 1 Capital to Average Quarterly Tangible Assets to Qualify as Well Capitalized Under Federal Deposit Insurance Act, Ratio	5.00%	5.00%

Line_of_Business_Results_Addit

Line of Business Results - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
	Branch
	Industry
Nature Of Operations [Abstract]	'	'	'
Number of state branch network	12	'	'
Number of business units	6	'	'
Federal income tax rate	35.00%	35.00%	35.00%
State income tax rate	2.20%	'	'

Line_of_Business_Results_Finan

Line of Business Results - Financial Information of Business Groups (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Segment Reporting Information [Line Items]	'		'		'
Net interest income (TE)	$2,325		$2,264		$2,267
Noninterest income	1,766		1,856		1,688
Provision (credit) for loan and lease losses	130		229		-60
Other noninterest expense	338		349		319
Other noninterest expense	-68	[1]	-111	[1]	-56	[1]
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	1,141		1,073		1,331
Allocated income taxes (benefit) and TE adjustments	271		231		364
Income (loss) from continuing operations	870		842		967
Income (loss) from discontinued operations, net of taxes	40		23		-35
Net income (loss)	910		865		932
Less: Net income (loss) attributable to noncontrolling interests	'		7		12
Net income (loss) attributable to Key	910		858		920
Key [Member]	'		'		'
Segment Reporting Information [Line Items]	'		'		'
Net interest income (TE)	2,348		2,288		2,292
Noninterest income	1,766		1,856		1,688
Total revenue (TE)	4,114		4,144		3,980
Provision (credit) for loan and lease losses	130		229		-60
Depreciation and amortization expense	259		250		270
Other noninterest expense	2,561		2,568		2,414
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	1,164		1,097		1,356
Allocated income taxes (benefit) and TE adjustments	294		255		389
Income (loss) from continuing operations	870		842		967
Income (loss) from discontinued operations, net of taxes	40		23		-35
Net income (loss)	910		865		932
Less: Net income (loss) attributable to noncontrolling interests	'		7		12
Net income (loss) attributable to Key	910		858		920
AVERAGE BALANCES	'		'		'
Loans and leases	53,054		50,362		48,606
Total assets	84,177		80,842		82,049
Deposits	65,877		61,835		59,263
OTHER FINANCIAL DATA	'		'		'
Expenditures for additions to long-lived assets	88		404		211
Net loan charge-offs	168		345		541
Return on average allocated equity	8.44%		8.21%		9.32%
Return on average allocated equity	8.83%		8.44%		8.98%
Average full-time equivalent employees	14,783		15,589		15,381
Key Community Bank [Member]	'		'		'
Segment Reporting Information [Line Items]	'		'		'
Net interest income (TE)	1,425		1,472		1,456
Noninterest income	766		753		750
Total revenue (TE)	2,191		2,225		2,206
Provision (credit) for loan and lease losses	156		150		148
Depreciation and amortization expense	76		55		38
Other noninterest expense	1,718		1,815		1,716
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	241		205		304
Allocated income taxes (benefit) and TE adjustments	90		76		113
Income (loss) from continuing operations	151		129		191
Income (loss) from discontinued operations, net of taxes	'		'		'
Net income (loss)	151		129		191
Less: Net income (loss) attributable to noncontrolling interests	'		'		'
Net income (loss) attributable to Key	151		129		191
AVERAGE BALANCES	'		'		'
Loans and leases	29,309		27,200		25,599
Total assets	31,628		29,616		27,781
Deposits	49,723		48,644		47,643
OTHER FINANCIAL DATA	'		'		'
Expenditures for additions to long-lived assets	6		318		117
Net loan charge-offs	147		195		274
Return on average allocated equity	5.30%		4.56%		6.22%
Return on average allocated equity	5.30%		4.56%		6.22%
Average full-time equivalent employees	8,202		8,784		8,399
Key Corporate Bank [Member]	'		'		'
Segment Reporting Information [Line Items]	'		'		'
Net interest income (TE)	756		770		757
Noninterest income	782		751		742
Total revenue (TE)	1,538		1,521		1,499
Provision (credit) for loan and lease losses	-6		24		-198
Depreciation and amortization expense	43		55		89
Other noninterest expense	811		791		736
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	690		651		872
Allocated income taxes (benefit) and TE adjustments	246		239		318
Income (loss) from continuing operations	444		412		554
Income (loss) from discontinued operations, net of taxes	'		'		'
Net income (loss)	444		412		554
Less: Net income (loss) attributable to noncontrolling interests	'		3		'
Net income (loss) attributable to Key	444		409		554
AVERAGE BALANCES	'		'		'
Loans and leases	20,447		18,879		17,410
Total assets	24,361		22,983		21,542
Deposits	15,778		12,637		10,798
OTHER FINANCIAL DATA	'		'		'
Expenditures for additions to long-lived assets	9		10		15
Net loan charge-offs	1		64		138
Return on average allocated equity	27.39%		23.81%		25.20%
Return on average allocated equity	27.39%		23.81%		25.20%
Average full-time equivalent employees	1,968		1,997		2,006
Other Segments [Member]	'		'		'
Segment Reporting Information [Line Items]	'		'		'
Net interest income (TE)	166		39		61
Noninterest income	221		375		238
Total revenue (TE)	387		414		299
Provision (credit) for loan and lease losses	-21		55		-5
Depreciation and amortization expense	6		9		18
Other noninterest expense	67		100		95
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	335		250		191
Allocated income taxes (benefit) and TE adjustments	21		-10		-30
Income (loss) from continuing operations	314		260		221
Income (loss) from discontinued operations, net of taxes	'		'		'
Net income (loss)	314		260		221
Less: Net income (loss) attributable to noncontrolling interests	'		4		12
Net income (loss) attributable to Key	314		256		209
AVERAGE BALANCES	'		'		'
Loans and leases	3,242		4,234		5,544
Total assets	27,676		27,630		31,629
Deposits	729		703		971
OTHER FINANCIAL DATA	'		'		'
Expenditures for additions to long-lived assets	'		'		'
Net loan charge-offs	20		86		129
Return on average allocated equity	46.66%		32.32%		22.19%
Return on average allocated equity	46.66%		32.32%		22.19%
Average full-time equivalent employees	54		53		75
Total Segments [Member]	'		'		'
Segment Reporting Information [Line Items]	'		'		'
Net interest income (TE)	2,347		2,281		2,274
Noninterest income	1,769		1,879		1,730
Total revenue (TE)	4,116		4,160		4,004
Provision (credit) for loan and lease losses	129		229		-55
Depreciation and amortization expense	125		119		145
Other noninterest expense	2,596		2,706		2,547
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	1,266		1,106		1,367
Allocated income taxes (benefit) and TE adjustments	357		305		401
Income (loss) from continuing operations	909		801		966
Income (loss) from discontinued operations, net of taxes	'		'		'
Net income (loss)	909		801		966
Less: Net income (loss) attributable to noncontrolling interests	'		7		12
Net income (loss) attributable to Key	909		794		954
AVERAGE BALANCES	'		'		'
Loans and leases	52,998		50,313		48,553
Total assets	83,665		80,229		80,952
Deposits	66,230		61,984		59,412
OTHER FINANCIAL DATA	'		'		'
Expenditures for additions to long-lived assets	15		328		132
Net loan charge-offs	168		345		541
Return on average allocated equity	17.67%		14.87%		15.36%
Return on average allocated equity	17.67%		14.87%		15.36%
Average full-time equivalent employees	10,224		10,834		10,480
Reconciling Items [Member]	'		'		'
Segment Reporting Information [Line Items]	'		'		'
Net interest income (TE)	1		7		18
Noninterest income	-3		-23		-42
Total revenue (TE)	-2		-16		-24
Provision (credit) for loan and lease losses	1		'		-5
Depreciation and amortization expense	134		131		125
Other noninterest expense	-35		-138		-133
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	-102		-9		-11
Allocated income taxes (benefit) and TE adjustments	-63		-50		-12
Income (loss) from continuing operations	-39		41		1
Income (loss) from discontinued operations, net of taxes	40		23		-35
Net income (loss)	1		64		-34
Less: Net income (loss) attributable to noncontrolling interests	'		'		'
Net income (loss) attributable to Key	1		64		-34
AVERAGE BALANCES	'		'		'
Loans and leases	56		49		53
Total assets	512		613		1,097
Deposits	-353		-149		-149
OTHER FINANCIAL DATA	'		'		'
Expenditures for additions to long-lived assets	73		76		79
Net loan charge-offs	'		'		'
Return on average allocated equity	-0.76%		0.85%		0.02%
Return on average allocated equity	0.02%		1.33%		-0.84%
Average full-time equivalent employees	4,559		4,755		4,901
[1]	For the years ended December 31, 2013, 2012, and 2011, net securities gains (losses) totaled $1 million, less than $1 million, and $1 million, respectively. For 2013, 2012, and 2011, we did not have any impairment losses related to securities.

Condensed_Financial_Informatio2

Condensed Financial Information of the Parent Company - Condensed Balance Sheets (Detail) (USD $)	Dec. 31, 2013		Dec. 31, 2012
In Millions, unless otherwise specified
Condensed Financial Statements, Captions [Line Items]	'		'
Banks	$53,609		$51,934
Accrued income and other assets	3,015	[1]	2,774	[1]
Total assets	92,934		89,236
Accrued expense and other liabilities	1,557		1,387
Subsidiaries	7,650		6,847
Total liabilities	82,614		78,927
SHAREHOLDERS' EQUITY	10,303		10,271
Total liabilities and equity	92,934		89,236
Parent Company [Member]	'		'
Condensed Financial Statements, Captions [Line Items]	'		'
Cash and due from banks and interest-bearing deposits	2,453		2,206
Banks	572		709
Total investment in subsidiaries	10,049		9,862
Accrued income and other assets	611		1,151
Total assets	13,685		13,928
Accrued expense and other liabilities	431		573
Subsidiaries	2,951		3,084
Total liabilities	3,382		3,657
SHAREHOLDERS' EQUITY	10,303		10,271
Total liabilities and equity	13,685		13,928
Parent Company [Member] | Banks [Member]	'		'
Condensed Financial Statements, Captions [Line Items]	'		'
Banks	90		90
Banks	9,310		9,155
Parent Company [Member] | Nonbank subsidiaries [Member]	'		'
Condensed Financial Statements, Captions [Line Items]	'		'
Banks	482		619
Banks	739		707
Parent Company [Member] | Subsidiaries [Member]	'		'
Condensed Financial Statements, Captions [Line Items]	'		'
Subsidiaries	398		431
Parent Company [Member] | Unaffiliated companies [Member]	'		'
Condensed Financial Statements, Captions [Line Items]	'		'
Subsidiaries	$2,553		$2,653
[1]	The assets of the VIEs can only be used by the particular VIE and there is no recourse to Key with respect to the liabilities of the consolidated LIHTC or education loan securitization trust VIEs.

Condensed_Financial_Informatio3

Condensed Financial Information of the Parent Company - Condensed Statements of Income (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items]	'		'		'
Other income	$68	[1]	$111	[1]	$56	[1]
Total income	2,620		2,705		2,889
Interest on long-term debt with subsidiary trusts	127		173		216
Income (loss) before income taxes and equity in net income (loss) less dividends from subsidiaries	1,141		1,073		1,331
Income tax (expense) benefit	-271		-231		-364
NET INCOME (LOSS)	910		865		932
Less: Net income attributable to noncontrolling interests	'		7		12
Net income (loss) attributable to Key	910		858		920
Parent Company [Member]	'		'		'
Condensed Financial Statements, Captions [Line Items]	'		'		'
Interest income from subsidiaries	26		36		67
Other income	15		66		18
Total income	641		1,877		430
Interest on long-term debt with subsidiary trusts	14		29		53
Interest on other borrowed funds	59		86		89
Personnel and other expense	85		91		178
Total expense	158		206		320
Income (loss) before income taxes and equity in net income (loss) less dividends from subsidiaries	483		1,671		110
Income tax (expense) benefit	40		57		73
Income (loss) before equity in net income (loss) less dividends from subsidiaries	523		1,728		183
Equity in net income (loss) less dividends from subsidiaries	387		-863		749
NET INCOME (LOSS)	910		865		932
Less: Net income attributable to noncontrolling interests	'		7		12
Net income (loss) attributable to Key	910		858		920
Parent Company [Member] | Banks [Member]	'		'		'
Condensed Financial Statements, Captions [Line Items]	'		'		'
Bank subsidiaries	600		1,775		'
Parent Company [Member] | Nonbank subsidiaries [Member]	'		'		'
Condensed Financial Statements, Captions [Line Items]	'		'		'
Bank subsidiaries	'		'		$345
[1]	For the years ended December 31, 2013, 2012, and 2011, net securities gains (losses) totaled $1 million, less than $1 million, and $1 million, respectively. For 2013, 2012, and 2011, we did not have any impairment losses related to securities.

Condensed_Financial_Informatio4

Condensed Financial Information of the Parent Company - Condensed Statements of Cash Flows (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
OPERATING ACTIVITIES	'	'	'
Net income (loss) attributable to Key	$910	$858	$920
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:	'	'	'
Deferred income taxes	29	35	317
Other operating activities, net	343	-66	392
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	1,579	1,268	1,793
INVESTING ACTIVITIES	'	'	'
Purchases of securities available for sale	-5,222	-1,772	-624
Proceeds from sales, prepayments and maturities of securities available for sale	4,470	5,551	5,000
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES	-4,224	-217	1,723
FINANCING ACTIVITIES	'	'	'
Net proceeds from issuance of long-term debt	2,573	837	1,046
Payments on long-term debt	-1,545	-3,394	-2,215
Repurchase of Treasury Shares	-474	-251	'
Series B Preferred Stock - TARP redemption	'	'	-2,500
Repurchase of common share warrant	'	'	-70
Cash dividends paid	-217	-191	-164
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	2,678	-1,160	-3,101
NET INCREASE (DECREASE) IN CASH AND DUE FROM BANKS	33	-109	415
CASH AND DUE FROM BANKS AT BEGINNING OF YEAR	584	693	278
CASH AND DUE FROM BANKS AT END OF YEAR	617	584	693
Parent Company [Member]	'	'	'
OPERATING ACTIVITIES	'	'	'
Net income (loss) attributable to Key	910	858	920
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:	'	'	'
Deferred income taxes	'	17	-39
Equity in net (income) loss less dividends from subsidiaries	-387	863	-749
Net (increase) decrease in other assets	245	-158	-130
Net increase (decrease) in other liabilities	103	85	-43
Other operating activities, net	20	13	83
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	891	1,678	42
INVESTING ACTIVITIES	'	'	'
Net (increase) decrease in interest-bearing deposits	2,115	-2,048	3,207
Purchases of securities available for sale	-14	-34	-18
Proceeds from sales, prepayments and maturities of securities available for sale	39	1	32
Net (increase) decrease in loans and advances to subsidiaries	-4	36	939
Net (increase) decrease in investments in subsidiaries	'	'	2
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES	2,136	-2,045	4,162
FINANCING ACTIVITIES	'	'	'
Net proceeds from issuance of long-term debt	750	'	1,000
Payments on long-term debt	-750	-1,149	-1,043
Repurchase of Treasury Shares	-474	-251	'
Series B Preferred Stock - TARP redemption	'	'	-2,500
Repurchase of common share warrant	'	'	-70
Net proceeds from the issuance of common shares and preferred stock	26	2	604
Cash dividends paid	-217	-191	-164
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	-665	-1,589	-2,173
NET INCREASE (DECREASE) IN CASH AND DUE FROM BANKS	2,362	-1,956	2,031
CASH AND DUE FROM BANKS AT BEGINNING OF YEAR	75	2,031	'
CASH AND DUE FROM BANKS AT END OF YEAR	$2,437	$75	$2,031

Condensed_Financial_Informatio5

Condensed Financial Information of the Parent Company - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement Of Cash Flows [Abstract]	'	'	'
Interest paid	$76	$118	$133