Other Nonint Income and Expense (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Other Noninterest Income
Gain on sale of Vantiv, Inc. shares and Vantiv, Inc. IPO	$ 148	$ 336	$ 272
Operating lease income	84	75	60
Equity method income from interest in Vantiv Holding, LLC	48	77	61
Cardholder fees	45	47	46
BOLI income (loss)	44	52	35
Valuation adjustments on the warrant and put options associated with sale of Vantiv Holding, LLC	31	206	67
Banking center income	30	34	32
Consumer loan and lease fees	25	27	27
Insurance income	13	25	28
Gain on loan sales		3	20
Loss on OREO	(14)	(26)	(57)
Loss on swap associated with the sale of VISA, Inc. class B shares	(38)	(31)	(45)
Other, net	34	54	28
Total other noninterest income	450	879	574
Other Noninterest Expense
Losses and adjustments	188	221	187
Impairment on affordable housing investments	135	108	90
Loan and lease	119	158	183
Marketing	98	114	128
FDIC insurance and other taxes	89	127	114
Professional services fees	72	76	56
Operating Lease	67	57	43
Travel	52	54	52
Postal and courier	47	48	48
Data processing	41	42	40
Recruitment and education	28	26	28
OREO expense	17	16	21
Insurance	16	17	18
Supplies	15	16	17
Intangible asset amortization	4	8	13
Loss on debt extinguishment		8	169
Benefit from for the reserve for unfunded commitments	(27)	(17)	(2)
Other	178	185	169
Total other noninterest expense	$ 1,139	$ 1,264	$ 1,374