Condensed Statement of Cash Flow - Parent Company Only (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Operating Activities
Net income (loss)	$ 1,481		$ 1,836		$ 1,576
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
(Benefit from) provision for deferred income taxes	79		253		271
Equity method income from interest in Vantiv Holding, LLC	48		77		61
Net change in:
Other assets	(221)		(672)		4
Accrued expenses and other liabilities	1		8		1
Net Cash Provided by (Used in) Operating Activities	2,076		4,595		2,557
Net change in:
Other short-term investments	(2,798)		(2,695)		(640)
Net Cash (Used in) Provided by Investing Activities	(8,938)		(10,184)		(6,533)
Financing Activities
Net change in other short-term borrowings	176		(4,900)		3,041
Proceeds from issuance of long-term debt	6,570		5,044		523
Repayment of long-term debt	1,399		2,225		3,159
Dividends paid on common shares	423		393		309
Dividends paid on preferred shares	67		37		35
Issuance of preferred shares	297		1,034
Repurchase of treasury shares and related forward contract	(654)		(1,320)		(650)
Other	(22)		(17)		(20)
Net Cash Used In Financing Activities	6,775		6,326		3,754
Net (Decrease) Increase in Cash	(87)		737		(222)
Cash and Due from Banks at Beginning of Period	3,178	[1]	2,441		2,663
Cash and Due from Banks at End of Period	3,091	[1]	3,178	[1]	2,441
Parent Company Only
Operating Activities
Net income (loss)	1,481		1,836		1,576
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
(Benefit from) provision for deferred income taxes	(1)		(1)		2
Equity method income from interest in Vantiv Holding, LLC	(491)		(1,103)		220
Net change in:
Other assets	8		13		57
Accrued expenses and other liabilities	(40)		(28)		18
Net Cash Provided by (Used in) Operating Activities	957		717		1,873
Net change in:
Other short-term investments	(684)		976		107
Loans to subsidiaries	(10)		47		11
Net Cash (Used in) Provided by Investing Activities	(694)		1,023		118
Financing Activities
Net change in other short-term borrowings	115		(255)		(89)
Proceeds from issuance of long-term debt	499		750		500
Repayment of long-term debt			(1,500)		(1,440)
Dividends paid on common shares	(423)		(393)		(309)
Dividends paid on preferred shares	(67)		(37)		(35)
Issuance of preferred shares	297		1,034
Repurchase of treasury shares and related forward contract	(654)		(1,320)		(650)
Other	(30)		(19)		(18)
Net Cash Used In Financing Activities	(263)		(1,740)		(2,041)
Net (Decrease) Increase in Cash					(50)
Cash and Due from Banks at Beginning of Period					$ 50

[1] At December 31, 2014 and 2013, includes $179 and $49 of cash and due from banks, $47 and $48 of commercial mortgage loans, $3,331 and $1,010 of automobile loans, $(22) and $(15) of ALLL, $25 and $13 of other assets, $5 and $1 of other liabilities, $3,434 and $1,048 of long-term debt from consolidated VIEs that are included in their respective captions. For further information, refer to Note 10.