Consolidated Statements of Income - USD ($) shares in Thousands, $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
INTEREST INCOME
Loans		$ 746	$ 542	$ 1,875	$ 1,597
Loans held for sale		10	10	23	29
Securities available for sale		88	75	237	217
Held-to-maturity securities		30	24	78	72
Trading account assets		4	5	17	15
Short-term investments		7	1	17	5
Other investments		5	4	10	14
Total interest income		890	661	2,257	1,949
INTEREST EXPENSE
Deposits		49	27	114	79
Bank notes and other short-term borrowings		2	2	7	6
Long-term debt		59	41	155	118
Total interest expense		110	70	276	203
NET INTEREST INCOME		780	591	1,981	1,746
Provision for credit losses		59	45	200	121
Net interest income after provision for credit losses		721	546	1,781	1,625
NONINTEREST INCOME
Trust and investment services income		122	108	341	328
Investment banking and debt placement fees		156	109	325	318
Service charges on deposit accounts		85	68	218	192
Operating lease income and other leasing gains		6	15	41	58
Corporate services income		51	57	154	143
Cards and payments income		66	47	164	136
Corporate-owned life insurance income		29	30	85	91
Consumer mortgage income		6	3	11	10
Mortgage servicing fees		15	11	37	33
Net gains (losses) from principal investing		5	11	16	51
Other income	[1]	8	11	61	35
Total noninterest income		549	470	1,453	1,395
NONINTEREST EXPENSE
Personnel		594	426	1,425	1,223
Net occupancy		73	60	193	191
Computer processing		70	41	158	121
Business services and professional fees		76	40	157	115
Equipment		26	22	68	66
Operating lease expense		15	11	42	34
Marketing		32	17	66	40
FDIC assessment		21	8	38	24
Intangible asset amortization		13	9	28	27
OREO expense, net		3	2	6	5
Other expense		159	88	355	258
Total noninterest expense		1,082	724	2,536	2,104
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES		188	292	698	916
Income taxes		16	72	141	230
INCOME (LOSS) FROM CONTINUING OPERATIONS		172	220	557	686
Income (loss) from discontinued operations, net of taxes of $0, ($2), $0, and $3		1	(3)	5	5
NET INCOME (LOSS)		173	217	562	691
Less: Net income (loss) attributable to noncontrolling interests		1	(2)	0	1
NET INCOME (LOSS) ATTRIBUTABLE TO KEY		172	219	562	690
Income (loss) from continuing operations attributable to Key common shareholders		165	216	540	668
Net income (loss) attributable to Key common shareholders		$ 166	$ 213	$ 545	$ 673
Per common share:
Income (loss) from continuing operations attributable to Key common shareholders (in usd per share)		$ 0.17	$ 0.26	$ 0.61	$ 0.79
Income (loss) from discontinued operations, net of taxes (in usd per share)		0.00	0.00	0.01	0.01
Net income (loss) attributable to Key common shareholders (in usd per share)	[2]	0.17	0.26	0.62	0.80
Per common share — assuming dilution:
Income (loss) from continuing operations attributable to Key common shareholders (in usd per share)		0.16	0.26	0.60	0.78
Income (loss) from discontinued operations, net of taxes (in usd per share)		0.00	0.00	0.01	0.01
Net income (loss) attributable to Key common shareholders (in usd per share)	[2]	0.17	0.25	0.61	0.79
Cash dividends declared per common share (in usd per share)		$ 0.085	$ 0.075	$ 0.245	$ 0.215
Weighted-average common shares outstanding (in shares)		982,080	831,430	880,824	839,758
Effect of convertible preferred stock (in shares)		0	0	0	0
Effect of common share options and other stock awards (in shares)		12,580	7,450	8,965	7,613
Weighted-average common shares and potential common shares outstanding (in shares)	[3]	994,660	838,880	889,789	847,371

[1] For the three months ended September 30, 2016, net securities losses totaled $6 million. For the three months ended September 30, 2015, net securities gains (losses) totaled less than $1 million. For the three months ended September 30, 2016, and September 30, 2015, 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.