Consolidated Statements of Income - USD ($) shares in Thousands, $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
INTEREST INCOME
Loans		$ 923	$ 888	$ 1,760	$ 1,777
Loans held for sale		10	11	22	22
Securities available for sale		188	133	361	263
Held-to-maturity securities		48	45	94	90
Trading account assets		7	5	13	10
Short-term investments		13	6	17	11
Other investments		4	2	6	4
Total interest income		1,193	1,090	2,273	2,177
INTEREST EXPENSE
Deposits		20	16	34	37
Federal funds purchased and securities sold under repurchase agreements		6	0	6	0
Bank notes and other short-term borrowings		9	3	12	4
Long-term debt		61	54	110	114
Total interest expense		96	73	162	155
NET INTEREST INCOME		1,097	1,017	2,111	2,022
Provision for credit losses		45	(222)	128	(315)
Net interest income after provision for credit losses		1,052	1,239	1,983	2,337
NONINTEREST INCOME
Trust and investment services income		137	133	273	266
Investment banking and debt placement fees		149	217	312	379
Service charges on deposit accounts		96	83	187	156
Operating lease income and other leasing gains		28	36	60	74
Corporate services income		88	55	178	119
Cards and payments income		85	113	165	218
Corporate-owned life insurance income		35	30	66	61
Consumer mortgage income		14	26	35	73
Commercial mortgage servicing fees		45	44	81	78
Other income	[1]	11	13	7	64
Total noninterest income		688	750	1,364	1,488
NONINTEREST EXPENSE
Personnel		607	623	1,237	1,247
Net occupancy		78	75	151	151
Computer processing		78	71	155	144
Business services and professional fees		52	51	105	101
Equipment		26	25	49	50
Operating lease expense		27	31	55	65
Marketing		34	31	62	57
Other expense		176	169	334	332
Total noninterest expense		1,078	1,076	2,148	2,147
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES		662	913	1,199	1,678
Income taxes		132	189	222	336
INCOME (LOSS) FROM CONTINUING OPERATIONS		530	724	977	1,342
Income (loss) from discontinued operations		3	5	4	9
NET INCOME (LOSS)		533	729	981	1,351
Less: Net income (loss) attributable to noncontrolling interests		0	0	0	0
NET INCOME (LOSS) ATTRIBUTABLE TO KEY		533	729	981	1,351
Income (loss) from continuing operations attributable to Key common shareholders		504	698	924	1,289
Net income (loss) attributable to Key common shareholders		$ 507	$ 703	$ 928	$ 1,298
Per Common Share:
Income (loss) from continuing operations attributable to Key common shareholders (in usd per share)		$ 0.54	$ 0.73	$ 1.00	$ 1.34
Income (loss) from discontinued operations, net of taxes (in usd per share)		0	0	0	0.01
Net income (loss) attributable to Key common shareholders (in usd per share)	[2]	0.55	0.73	1.00	1.35
Per Common Share — assuming dilution:
Income (loss) from continuing operations attributable to Key common shareholders (in usd per share)		0.54	0.72	0.99	1.33
Income (loss) from discontinued operations, net of taxes (in usd per share)		0	0	0	0.01
Net income (loss) attributable to Key common shareholders (in usd per share)	[2]	$ 0.54	$ 0.73	$ 1.00	$ 1.34
Weighted-average common shares outstanding (000) (in shares)		924,302	957,423	923,717	961,292
Effect of common share options and other stock awards (in shares)		7,506	9,740	9,087	9,514
Weighted-average common shares and potential common shares outstanding (in shares)	[3]	931,808	967,163	932,805	970,806

[1] For the three and six months ended June 30, 2022, and June 30, 2021, we had no net securities gains (losses). For the three and six months ended June 30, 2022, and June 30, 2021, 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.