Other Assets (Other Assets - Additional Information) (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015		Dec. 31, 2014	Jun. 30, 2014	[2]	Sep. 30, 2013	[2]	Jun. 30, 2013	[2]	Dec. 31, 2012	[2]	Mar. 31, 2012	Jun. 30, 2009
Other assets
Percentage of Vantiv Holding, LLC sold to Advent for cash and warrants															51.00%
OTTI	[1]	$ 16	$ 5		$ 24
Private equity investments
Other assets
Private Equity Fund Impairment		$ 9	$ 1		$ 0
Vantiv Holding, LLC
Other assets
Percentage of Vantiv Holding, LLC sold to Advent for cash and warrants															51.00%
Percentage of ownership under the equity method of accounting		17.90%	18.00%	[2]		23.00%		25.00%		28.00%		33.00%		39.00%	49.00%
Payment From Vantiv Inc to Bancorp To Terminate And Settle Certain Remaining TRA Cash Flows		$ 171
Potential Termination And Settlement Of Tra Cash Flows		$ 394

[1] (a) Included in securiti es gains, net, in the Consolidated Statements of Income .

[2] (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.