Net Gains (Losses) Recorded in the Consolidated Statements of Income Relating to Free-Standing Derivative Instruments Used for Risk Management and Other Business Purposes (Parenthetical) (Detail) $ in Millions	3 Months Ended
	Dec. 31, 2015 USD ($)
Common Class A Member | Vantiv Holding, LLC
Derivative Instruments, Gain (Loss) [Line Items]
Proceeds From Warrant Exercises	$ 89