Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Interest income:
Interest and fees on loans	$ 1,847	$ 1,729	$ 1,686
Interest on money market investments	19	21	23
Interest on securities	326	204	124
Total interest income	2,192	1,954	1,833
Interest expense:
Interest on deposits	59	49	49
Interest on short- and long-term borrowings	68	38	69
Total interest expense	127	87	118
Net interest income	2,065	1,867	1,715
Provision for loan losses	24	93	40
Net interest income after provision for loan losses	2,041	1,774	1,675
Noninterest income:
Service charges and fees on deposit accounts	171	171	168
Other service charges, commissions and fees	217	208	187
Wealth management and trust income	42	37	31
Loan sales and servicing income	25	35	31
Capital markets and foreign exchange	30	22	26
Noninterest income, Customer-related Fees	485	473	443
Dividends and other investment income	40	24	30
Securities gains (losses), net	14	7	(127)
Impairment losses on investment securities:
Other	5	12	11
Noninterest Income	544	516	357
Noninterest expense:
Salaries and employee benefits	1,011	983	973
Occupancy, net	129	125	120
Furniture, equipment, and software	130	125	123
Other real estate expense, net	1	2	1
Credit-related expense	29	26	29
Provision for unfunded lending commitments	(7)	(10)	(6)
Professional and legal services	54	55	50
Advertising	22	22	25
FDIC premiums	53	40	34
Amortization of core deposit and other Intangibles	6	8	9
Other	223	213	225
Noninterest Expense	1,649	1,585	1,581
Income before income taxes	936	705	451
Income taxes	344	236	142
Net income	592	469	309
Preferred stock dividends	(40)	(48)	(62)
Preferred Stock Redemption			0
Net earnings applicable to common shareholders	$ 550	$ 411	$ 247
Weighted average common shares outstanding during the period:
Basic shares	200,776	203,855	203,265
Diluted shares	209,653	204,269	203,698
Net earnings per common share:
Basic, per share	$ 2.71	$ 2.00	$ 1.20
Diluted, per share	$ 2.60	$ 1.99	$ 1.20