Consolidated Statements of Income - USD ($) shares in Thousands, $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
INTEREST INCOME
Loans		$ 940	$ 877
Loans held for sale		12	13
Securities available for sale		95	95
Held-to-maturity securities		69	51
Trading account assets		7	7
Short-term investments		8	3
Other investments		6	4
Total interest income		1,137	1,050
INTEREST EXPENSE
Deposits		91	58
Federal funds purchased and securities sold under repurchase agreements		4	1
Bank notes and other short-term borrowings		6	5
Long-term debt		92	68
Total interest expense		193	132
NET INTEREST INCOME		944	918
Provision for credit losses		61	63
Net interest income after provision for credit losses		883	855
NONINTEREST INCOME
Trust and investment services income		133	135
Investment banking and debt placement fees		143	127
Service charges on deposit accounts		89	87
Operating lease income and other leasing gains		32	23
Corporate services income		62	54
Cards and payments income		62	65
Corporate-owned life insurance income		32	30
Consumer mortgage income		7	6
Mortgage servicing fees		20	18
Other income	[1]	21	32
Total noninterest income		601	577
NONINTEREST EXPENSE
Personnel		594	556
Net occupancy		78	87
Computer processing		52	60
Business services and professional fees		41	46
Equipment		26	27
Operating lease expense		27	19
Marketing		25	21
FDIC assessment		21	20
Intangible asset amortization		29	22
OREO expense, net		2	2
Other expense		111	153
Total noninterest expense		1,006	1,013
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES		478	419
Income taxes		62	94
INCOME (LOSS) FROM CONTINUING OPERATIONS		416	325
Income (loss) from discontinued operations		2	0
NET INCOME (LOSS)		418	325
Less: Net income (loss) attributable to noncontrolling interests		0	1
NET INCOME (LOSS) ATTRIBUTABLE TO KEY		418	324
Income (loss) from continuing operations attributable to Key common shareholders		402	296
Net income (loss) attributable to Key common shareholders		$ 404	$ 296
Per common share:
Income (loss) from continuing operations attributable to Key common shareholders (in usd per share)		$ 0.38	$ 0.28
Income (loss) from discontinued operations, net of taxes (in usd per share)		0.00	0.00
Net income (loss) attributable to Key common shareholders (in usd per share)	[2]	0.38	0.28
Per common share — assuming dilution:
Income (loss) from continuing operations attributable to Key common shareholders (in usd per share)		0.38	0.27
Income (loss) from discontinued operations, net of taxes (in usd per share)		0.00	0.00
Net income (loss) attributable to Key common shareholders (in usd per share)	[2]	0.38	0.27
Cash dividends declared per common share (in usd per share)		$ 0.105	$ 0.085
Weighted-average common shares outstanding (in shares)		1,056,037	1,068,609
Effect of common share options and other stock awards (in shares)		15,749	17,931
Weighted-average common shares and potential common shares outstanding (in shares)	[3]	1,071,786	1,086,540

[1] For the three months ended March 31, 2018, net securities gains totaled less than $1 million. For the three months ended March 31, 2017, net securities gains totaled $1 million. For the three months ended March 31, 2018, and March 31, 2017, 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.