CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
INTEREST INCOME:
Interest and fees on loans and leases	$ 4,249	$ 3,653	$ 3,211
Interest and fees on loans held for sale, at fair value	18	15	10
Interest and fees on other loans held for sale	10	6	7
Investment securities	625	584	621
Interest-bearing deposits in banks	18	8	5
Total interest income	4,920	4,266	3,854
INTEREST EXPENSE:
Deposits	441	270	237
Federal funds purchased and securities sold under agreements to repurchase	3	2	16
Other short-term borrowed funds	31	40	67
Long-term borrowed funds	272	196	132
Total interest expense	747	508	452
Net interest income	4,173	3,758	3,402
Provision for credit losses	321	369	302
Net interest income after provision for credit losses	3,852	3,389	3,100
NONINTEREST INCOME:
Service charges and fees	516	522	500
Card fees	233	203	232
Capital markets fees	194	136	104
Trust and investment services fees	158	146	157
Letter of credit and loan fees	121	112	110
Foreign exchange and interest rate products	109	103	90
Mortgage banking fees	108	112	101
Securities gains, net	11	16	29
Net securities impairment losses recognized in earnings	(7)	(12)	(7)
Other income	91	159	106
Total noninterest income	1,534	1,497	1,422
NONINTEREST EXPENSE:
Salaries and employee benefits	1,761	1,709	1,636
Outside services	404	377	371
Occupancy	319	307	319
Equipment expense	263	263	257
Amortization of software	180	170	146
Other operating expense	547	526	530
Total noninterest expense	3,474	3,352	3,259
Income before income tax expense	1,912	1,534	1,263
Income tax expense	260	489	423
NET INCOME	1,652	1,045	840
Net income available to common stockholders	$ 1,638	$ 1,031	$ 833
Weighted-average common shares outstanding:
Basic (in shares)	502,157,440	522,093,545	535,599,731
Diluted (in shares)	503,685,091	523,930,718	538,220,898
Per common share information:
Basic earnings (in dollars per share)	$ 3.26	$ 1.97	$ 1.55
Diluted earnings (in dollars per share)	3.25	1.97	1.55
Dividends declared and paid (in dollars per share)	$ 0.64	$ 0.46	$ 0.4