Other Noninterest Income and Other Noninterest Expense (Other Nonint Income and Expense) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Other Noninterest Income
Income from the tax receivable agreement associated with Vantiv, Inc.	$ 313	$ 80	$ 23
Operating lease income	102	89	84
Equity method income from interest in Vantiv Holding, LLC	66	63	48
Valuation adjustments on the warrant associated with Vantiv Holding, LLC	64	236	31
BOLI income (loss)	53	48	44
Cardholder fees	46	43	45
Consumer loan and lease fees	23	23	25
Banking center income	20	21	30
Gain on sale of certain retail branch operations	19	0	0
Private equity investment income	11	28	27
Insurance income	11	14	13
Net gain on loan sales	10	38	0
Gain on sale and exercise of the warrant associated with Vantiv Holding, LLC	9	89	0
Gain on sale of Vantiv, Inc. shares	0	331	125
Loss on swap associated with the sale of Visa, Inc. class B shares	(56)	(37)	(38)
Net losses on disposition and impairment of bank premises and equipment	(13)	(101)	(19)
Other, net	10	14	12
Total other noninterest income	688	979	450
Other Noninterest Expense
Impairment on affordable housing investments	168	145	135
FDIC insurance and other taxes	126	99	89
Loan and lease	110	118	119
Marketing	104	110	98
Operating Lease	86	74	67
Losses and adjustments	73	55	188
Professional services fees	61	70	72
Data processing	51	45	41
Postal and courier	46	45	47
Travel	45	54	52
Recruitment and education	37	33	28
Provision for (benefit from) for the reserve for unfunded commitments	23	4	(27)
Donations	23	29	18
Insurance	15	17	16
Supplies	14	16	15
Other, net	187	191	181
Total other noninterest expense	$ 1,169	$ 1,105	$ 1,139