CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Interest income
Interest and fees on loans and leases	$ 1,957	$ 1,722	$ 1,394
Interest and fees on loans held for sale	33	30	31
Interest on investment securities	121	105	121
Interest on trading securities	30	35	47
Interest on other earning assets	17	6	31
Total interest income	2,158	1,898	1,624
Interest expense:
Interest on deposits	81	152	307
Interest on trading liabilities	6	6	13
Interest on short-term borrowings	5	14	41
Interest on term borrowings	72	64	53
Total interest expense	164	236	414
Net interest income	1,994	1,662	1,210
Provision for credit losses	(310)	503	45
Net interest income after provision for credit losses	2,304	1,159	1,165
Noninterest income
Fixed income	406	423	279
Deposit transactions and cash management	175	148	132
Mortgage banking and title income	154	129	10
Brokerage, management fees and commissions	88	66	55
Card and digital banking fees	78	60	49
Trust services and investment management	51	39	30
Other service charges and fees	44	26	21
Purchase accounting gain	(1)	533	0
Other income	68	74	78
Total noninterest income	1,076	1,492	654
Noninterest expense
Personnel expense	1,210	1,033	695
Net occupancy expense	137	116	80
Computer software	116	85	61
Operations services	80	56	46
Legal and professional fees	68	84	72
Contract employment and outsourcing	67	24	13
Amortization of intangible assets	56	40	25
Equipment expense	47	42	34
Communications and delivery	37	31	25
Advertising and public relations	37	18	34
Impairment of long-lived assets	34	7	23
Contributions	14	41	11
Other expense	193	141	114
Total noninterest expense	2,096	1,718	1,233
Income before income taxes	1,284	933	586
Income tax expense	274	76	134
Net income (loss)	1,010	857	452
Net income attributable to noncontrolling interest	11	12	11
Net income attributable to controlling interest	999	845	441
Preferred stock dividends	37	23	6
Net income available to common shareholders	$ 962	$ 822	$ 435
Basic earnings per share (in dollars per share)	$ 1.76	$ 1.90	$ 1.39
Diluted earnings per share (in dollars per share)	$ 1.74	$ 1.89	$ 1.38
Weighted average common shares (in shares)	546,354	432,125	313,637
Diluted average common shares (in shares)	551,241	433,717	315,657