CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
INTEREST INCOME:
Interest and fees on loans and leases	$ 1,146	$ 992
Interest and fees on loans held for sale, at fair value	4	4
Interest and fees on other loans held for sale	4	1
Investment securities	168	160
Interest-bearing deposits in banks	6	3
Total interest income	1,328	1,160
INTEREST EXPENSE:
Deposits	145	86
Federal funds purchased and securities sold under agreements to repurchase	1	1
Other short-term borrowed funds	9	8
Long-term borrowed funds	82	60
Total interest expense	237	155
Net interest income	1,091	1,005
Provision for credit losses	78	96
Net interest income after provision for credit losses	1,013	909
NONINTEREST INCOME:
Service charges and fees	124	125
Card fees	61	60
Capital markets fees	39	48
Trust and investment services fees	40	39
Letter of credit and loan fees	30	29
Foreign exchange and interest rate products	27	27
Mortgage banking fees	25	23
Securities gains, net	8	4
Net impairment losses recognized in earnings on debt securities	(1)	(1)
Other income	18	25
Total noninterest income	371	379
NONINTEREST EXPENSE:
Salaries and employee benefits	470	446
Outside services	99	91
Occupancy	81	82
Equipment expense	67	67
Amortization of software	46	44
Other operating expense	120	124
Total noninterest expense	883	854
Income before income tax expense	501	434
Income tax expense	113	114
NET INCOME	388	320
Net income available to common stockholders	$ 381	$ 313
Weighted-average common shares outstanding:
Basic (in Shares)	487,500,618	509,451,450
Diluted (in Shares)	489,266,826	511,348,200
Per common share information:
Basic earnings (in Dollars per Share)	$ 0.78	$ 0.61
Diluted earnings (in Dollars per Share)	0.78	0.61
Dividends declared and paid (in Dollars per Share)	$ 0.22	$ 0.14