Consolidated Statements of Income (USD $) In Millions, except Share data in Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
INTEREST INCOME
Loans	$ 2,110		$ 2,151		$ 2,155
Loans held for sale	21		20		20
Securities available for sale	277		311		399
Held-to-maturity securities	93		82		69
Trading account assets	25		21		18
Short-term investments	6		6		6
Other investments	22		29		38
Total interest income	2,554		2,620		2,705
INTEREST EXPENSE
Deposits	117		158		257
Federal funds purchased and securities sold under repurchase agreements	2		2		4
Bank notes and other short-term borrowings	9		8		7
Long-term debt	133		127		173
Total interest expense	261		295		441
NET INTEREST INCOME	2,293		2,325		2,264
Provision (credit) for loan and lease losses	59		130		229
Net interest income (expense) after provision for loan and lease losses	2,234		2,195		2,035
NONINTEREST INCOME
Trust and investment services income	403		393		375
Investment banking and debt placement fees	397		333		327
Service charges on deposit accounts	261		281		287
Operating lease income and other leasing gains	96		117		201
Corporate services income	178		172		168
Cards and payments income	166		162		135
Corporate-owned life insurance income	118		120		122
Consumer mortgage income	10		19		40
Mortgage servicing fees	46		58		24
Net gains (losses) from principal investing	78		52		72
Other income	44	[1]	59	[1]	105	[1]
Total noninterest income	1,797		1,766		1,856
NONINTEREST EXPENSE
Personnel	1,591		1,609		1,570
Net occupancy	261		275		260
Computer processing	158		156		164
Business services and professional fees	156		151		190
Equipment	96		104		107
Operating lease expense	42		47		57
Marketing	49		51		68
FDIC assessment	30		30		31
Intangible asset amortization	39		44		23
Provision (credit) for losses on lending-related commitments	(2)		8		(16)
OREO expense, net	5		7		15
Other expense	334		338		349
Total noninterest expense	2,759		2,820		2,818
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	1,272		1,141		1,073
Income taxes	326		271		231
INCOME (LOSS) FROM CONTINUING OPERATIONS	946		870		842
Income (loss) from discontinued operations, net of taxes of ($23), $26 and $14 (see Note 13)	(39)		40		23
NET INCOME (LOSS)	907		910		865
Less: Net income (loss) attributable to noncontrolling interests	7				7
NET INCOME (LOSS) ATTRIBUTABLE TO KEY	900		910		858
Income (loss) from continuing operations attributable to Key common shareholders	917		847		813
Net income (loss) attributable to Key common shareholders	$ 878		$ 887		$ 836
Per common share:
Income (loss) from continuing operations attributable to Key common shareholders	$ 1.05		$ 0.93		$ 0.87
Income (loss) from discontinued operations, net of taxes	$ (0.04)		$ 0.04		$ 0.02
Net income (loss) attributable to Key common shareholders	$ 1.01	[2]	$ 0.98	[2]	$ 0.89	[2]
Per common share - assuming dilution:
Income (loss) from continuing operations attributable to Key common shareholders	$ 1.04		$ 0.93		$ 0.86
Income (loss) from discontinued operations, net of taxes	$ (0.04)		$ 0.04		$ 0.02
Net income (loss) attributable to Key common shareholders	$ 0.99	[2]	$ 0.97	[2]	$ 0.89	[2]
Cash dividends declared per common share	$ 0.250		$ 0.215		$ 0.180
Weighted-average common shares outstanding (000)	871,464		906,524		938,941
Effect of convertible preferred stock	0		0		0
Effect of common share options and other stock awards	6,735		6,047		4,318
Weighted-average common shares and potential common shares outstanding (000)	878,199	[3]	912,571	[3]	943,259	[3]

[1] For the years ended December 31, 2014, 2013, and 2012, net securities gains (losses) totaled less than $1 million, $1 million, and less than $1 million, respectively. For 2014, 2013, and 2012, we did not have any impairment losses related to securities.

[2] EPS may not foot due to rounding.

[3] Assumes conversion of common share options and other stock awards and/or convertible preferred stock, as applicable.