Other Noninterest Income and Other Noninterest Expense (Other Nonint Income and Expense) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other Noninterest Income
Income from the tax receivable agreement associated with Vantiv, Inc.	$ 44	$ 313	$ 80
Operating lease income	96	102	89
Equity method income from interest in Vantiv Holding, LLC	47	66	63
Valuation adjustments on the warrant associated with Vantiv Holding, LLC	0	64	236
BOLI income (loss)	52	53	48
Cardholder fees	54	46	43
Consumer loan and lease fees	23	23	23
Banking center income	20	20	21
Gain on sale of certain retail branch operations	0	19	0
Private equity investment income	36	11	28
Insurance income	8	11	14
Net gain on loan sales	(2)	10	38
Gain on sale and exercise of the warrant associated with Vantiv Holding, LLC	0	9	89
Gain on sale of Vantiv, Inc. shares	1,037	0	331
Loss on swap associated with the sale of Visa, Inc. class B shares	(80)	(56)	(37)
Net losses on disposition and impairment of bank premises and equipment	0	(13)	(101)
Other, net	22	10	14
Total other noninterest income	1,357	688	979
Other Noninterest Expense
Impairment on affordable housing investments	222	168	145
FDIC insurance and other taxes	127	126	99
Loan and lease	102	110	118
Marketing	114	104	110
Operating Lease	87	86	74
Losses and adjustments	59	73	55
Professional services fees	83	61	70
Data processing	58	51	45
Postal and courier	42	46	45
Travel	46	45	54
Recruitment and education	35	37	33
Provision for (benefit from) for the reserve for unfunded commitments	0	23	4
Donations	28	23	29
Insurance	12	15	17
Supplies	14	14	16
Other, net	186	187	191
Total other noninterest expense	$ 1,215	$ 1,169	$ 1,105