Related Party (Summary of Vantiv Holding, LLC Sales Transactions) (Detail) - USD ($) $ in Millions	3 Months Ended											12 Months Ended
	Dec. 31, 2015		Jun. 30, 2014		Sep. 30, 2013		Jun. 30, 2013		Dec. 31, 2012		Mar. 31, 2012	Dec. 31, 2016	Dec. 31, 2015		Dec. 31, 2014	Jun. 30, 2009
Related Party Transactions
Gain on sale of Vantiv, Inc. shares												$ 0	$ 331		$ 125
Vantiv Holding, LLC
Related Party Transactions
Percentage Of Vantiv Holding, LLC Sold	5.00%		3.00%		3.00%		5.00%		6.00%				5.00%
Gain on sale of Vantiv, Inc. shares	$ 331		$ 125		$ 85		$ 242		$ 157		$ 115
Equity Method Investment, Ownership Percentage	18.00%	[1]	23.00%	[1]	25.00%	[1]	28.00%	[1]	33.00%	[1]	39.00%	17.90%	18.00%	[1]		49.00%

[1] (a) The Bancorp’s remaining investment in Vantiv Holding, LLC of $ 414 as of December 31, 201 6 was accounted for as an equity method investment in the Bancorp’s Consolidated Financial Statements.