Consolidated Statements of Income - USD ($) shares in Thousands, $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
INTEREST INCOME
Loans		$ 1,073	$ 1,025	$ 3,221	$ 2,965
Loans held for sale		18	12	46	40
Securities available for sale		136	102	400	294
Held-to-maturity securities		64	72	199	213
Trading account assets		7	7	24	21
Short-term investments		16	15	49	31
Other investments		3	6	11	17
Total interest income		1,317	1,239	3,950	3,581
INTEREST EXPENSE
Deposits		227	140	652	343
Federal funds purchased and securities sold under repurchase agreements		0	1	1	10
Bank notes and other short-term borrowings		4	4	13	17
Long-term debt		114	108	354	302
Total interest expense		345	253	1,020	672
NET INTEREST INCOME		972	986	2,930	2,909
Provision for credit losses		200	62	336	187
Net interest income after provision for credit losses		772	924	2,594	2,722
NONINTEREST INCOME
Trust and investment services income		118	117	355	378
Investment banking and debt placement fees		176	166	449	464
Service charges on deposit accounts		86	85	251	265
Operating lease income and other leasing gains		42	35	123	61
Corporate services income		63	52	171	175
Cards and payments income		69	69	208	202
Corporate-owned life insurance income		32	34	97	98
Consumer mortgage income		14	9	32	23
Mortgage servicing fees		23	19	68	61
Other income	[1]	27	23	54	143
Total noninterest income		650	609	1,808	1,870
NONINTEREST EXPENSE
Personnel		547	553	1,699	1,733
Net occupancy		72	76	217	233
Computer processing		53	52	163	155
Business services and professional fees		43	43	132	135
Equipment		27	27	75	79
Operating lease expense		33	31	91	88
Marketing		26	26	69	77
FDIC assessment		7	21	23	63
Intangible asset amortization		26	23	70	77
OREO expense, net		3	3	10	5
Other expense		102	109	372	318
Total noninterest expense		939	964	2,921	2,963
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES		483	569	1,481	1,629
Income taxes		70	87	239	252
INCOME (LOSS) FROM CONTINUING OPERATIONS		413	482	1,242	1,377
Income (loss) from discontinued operations		3	0	6	5
NET INCOME (LOSS)		416	482	1,248	1,382
Less: Net income (loss) attributable to noncontrolling interests		0	0	0	0
NET INCOME (LOSS) ATTRIBUTABLE TO KEY		416	482	1,248	1,382
Income (loss) from continuing operations attributable to Key common shareholders		383	468	1,172	1,334
Net income (loss) attributable to Key common shareholders		$ 386	$ 468	$ 1,178	$ 1,339
Per Common Share:
Income (loss) from continuing operations attributable to Key common shareholders (in usd per share)		$ 0.39	$ 0.45	$ 1.17	$ 1.27
Income (loss) from discontinued operations, net of taxes (in usd per share)		0	0	0.01	0.01
Net income (loss) attributable to Key common shareholders (in usd per share)	[2]	0.39	0.45	1.18	1.28
Per Common Share — assuming dilution:
Income (loss) from continuing operations attributable to Key common shareholders (in usd per share)		0.38	0.45	1.16	1.26
Income (loss) from discontinued operations, net of taxes (in usd per share)		0	0	0.01	0.01
Net income (loss) attributable to Key common shareholders (in usd per share)	[2]	0.39	0.45	1.17	1.26
Cash dividends declared per common share (in usd per share)		$ 0.185	$ 0.17	$ 0.525	$ 0.395
Weighted-average common shares outstanding (000) (in shares)		988,319	1,036,479	998,268	1,048,397
Effect of common share options and other stock awards (in shares)		10,009	13,497	9,632	14,419
Weighted-average common shares and potential common shares outstanding (in shares)	[3]	998,328	1,049,976	1,007,900	1,062,816

[1] For the three and nine months ended September 30, 2019, net securities gains (losses) totaled $15 million. For the three and nine months ended September 30, 2018, net securities gains (losses) totaled less than $1 million. For the three and nine months ended September 30, 2019, and September 30, 2018, Key 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.