CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
INTEREST INCOME:
Interest and fees on loans and leases (related party balances of $70, $72 and $56, respectively)	$ 3,211	$ 3,012	$ 3,001
Interest and fees on loans held for sale, at fair value	10	5	12
Interest and fees on other loans held for sale	7	23	0
Investment securities	621	619	477
Interest-bearing deposits in banks	5	5	11
Total interest income	3,854	3,664	3,501
INTEREST EXPENSE:
Deposits (related party balances of $0, $0 and $15, respectively)	237	156	216
Deposits held for sale	0	4	0
Federal funds purchased and securities sold under agreements to repurchase (related party balances of $7, $24 and $184, respectively)	16	32	192
Other short-term borrowed funds (related party balances of $51, $75 and $3, respectively)	67	89	4
Long-term borrowed funds (related party balances of $76, $64 and $16, respectively)	132	82	31
Total interest expense	452	363	443
Net interest income	3,402	3,301	3,058
Provision for credit losses	302	319	479
Net interest income after provision for credit losses	3,100	2,982	2,579
NONINTEREST INCOME:
Service charges and fees (related party balances of $3, $6 and $15, respectively)	575	574	640
Card fees	232	233	234
Trust and investment services fees	157	158	149
Mortgage banking fees	101	71	153
Capital markets fees (related party balances of $9, $11 and $14, respectively)	88	91	53
Foreign exchange and trade finance fees (related party balances of $19, $58 and ($15), respectively)	90	95	97
Bank-owned life insurance income	56	49	50
Securities gains, net	29	28	144
Net securities impairment losses recognized in earnings	(7)	(10)	(8)
Other income (related party balances of ($105), ($209), and ($32), respectively)	101	389	120
Total noninterest income	1,422	1,678	1,632
NONINTEREST EXPENSE:
Salaries and employee benefits	1,636	1,678	1,652
Outside services (related party balances of $11, $22 and $20, respectively)	371	420	360
Occupancy (related party balances of $2, $1 and $3, respectively)	319	326	327
Equipment expense	257	250	275
Amortization of software	146	145	102
Goodwill impairment	0	0	4,435
Other operating expense	530	573	528
Total noninterest expense	3,259	3,392	7,679
Income (loss) before income tax expense (benefit)	1,263	1,268	(3,468)
Income tax expense (benefit)	423	403	(42)
NET INCOME (LOSS)	840	865	(3,426)
Net income (loss) available to common stockholders	$ 833	$ 865	$ (3,426)
Weighted-average common shares outstanding:
Basic (in Shares)	535,599,731	556,674,146	559,998,324
Diluted (in Shares)	538,220,898	557,724,936	559,998,324
Per common share information:
Basic earnings (loss) (in Dollars per Share)	$ 1.55	$ 1.55	$ (6.12)
Diluted earnings (loss) (in Dollars per Share)	1.55	1.55	(6.12)
Dividends declared and paid (in dollars per Share)	$ 0.4	$ 1.43	$ 2.12