Consolidated Statements of Income - USD ($) shares in Thousands, $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
INTEREST INCOME
Loans		$ 980	$ 1,082	$ 2,006	$ 2,148
Loans held for sale		21	15	40	28
Securities available for sale		121	135	250	264
Held-to-maturity securities		56	67	118	135
Trading account assets		5	9	13	17
Short-term investments		7	17	13	33
Other investments		0	4	1	8
Total interest income		1,190	1,329	2,441	2,633
INTEREST EXPENSE
Deposits		96	223	265	425
Federal funds purchased and securities sold under repurchase agreements		0	0	6	1
Bank notes and other short-term borrowings		5	5	10	9
Long-term debt		71	120	161	240
Total interest expense		172	348	442	675
NET INTEREST INCOME		1,018	981	1,999	1,958
Provision for credit losses		482	74	841	136
Net interest income after provision for credit losses		536	907	1,158	1,822
NONINTEREST INCOME
Trust and investment services income		123	122	256	237
Investment banking and debt placement fees		156	163	272	273
Service charges on deposit accounts		68	83	152	165
Operating lease income and other leasing gains		60	44	90	81
Corporate services income		52	53	114	108
Cards and payments income		91	73	157	139
Corporate-owned life insurance income		35	33	71	65
Consumer mortgage income		62	15	82	26
Commercial mortgage servicing fees		12	19	30	37
Other income	[1]	33	17	(55)	27
Total noninterest income		692	622	1,169	1,158
NONINTEREST EXPENSE
Personnel		572	589	1,087	1,152
Net occupancy		71	73	147	145
Computer processing		56	56	111	110
Business services and professional fees		49	45	93	89
Equipment		25	24	49	48
Operating lease expense		34	32	70	58
Marketing		24	24	45	43
FDIC assessment		8	9	17	16
Intangible asset amortization		18	22	35	44
OREO expense, net		6	4	9	7
Other expense		150	141	281	270
Total noninterest expense		1,013	1,019	1,944	1,982
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES		215	510	383	998
Income taxes		30	87	53	169
INCOME (LOSS) FROM CONTINUING OPERATIONS		185	423	330	829
Income (loss) from discontinued operations		2	2	3	3
NET INCOME (LOSS)		187	425	333	832
Less: Net income (loss) attributable to noncontrolling interests		0	0	0	0
NET INCOME (LOSS) ATTRIBUTABLE TO KEY		187	425	333	832
Income (loss) from continuing operations attributable to Key common shareholders		159	403	277	789
Net income (loss) attributable to Key common shareholders		$ 161	$ 405	$ 280	$ 792
Per Common Share:
Income (loss) from continuing operations attributable to Key common shareholders (in usd per share)		$ 0.16	$ 0.40	$ 0.29	$ 0.79
Income (loss) from discontinued operations, net of taxes (in usd per share)		0	0	0	0
Net income (loss) attributable to Key common shareholders (in usd per share)	[2]	0.17	0.40	0.29	0.79
Per Common Share — assuming dilution:
Income (loss) from continuing operations attributable to Key common shareholders (in usd per share)		0.16	0.40	0.28	0.78
Income (loss) from discontinued operations, net of taxes (in usd per share)		0	0	0	0
Net income (loss) attributable to Key common shareholders (in usd per share)	[2]	0.17	0.40	0.29	0.78
Cash dividends declared per common share (in usd per share)		$ 0.185	$ 0.17	$ 0.370	$ 0.34
Weighted-average common shares outstanding (000) (in shares)		967,147	999,163	967,380	1,003,047
Effect of common share options and other stock awards (in shares)		4,994	8,801	6,892	9,318
Weighted-average common shares and potential common shares outstanding (in shares)	[3]	972,141	1,007,964	974,272	1,012,365

[1] For the three months ended June 30, 2020, we had no net securities gains (losses). For the six months ended June 30, 2020, net securities gains (losses) totaled $4 million. For the three and six months ended June 30, 2019, net securities gains (losses) totaled less than $1 million. For the three months ended June 30, 2020, and June 30, 2019, 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.