Reconciliation of the Beginning and Ending Amounts of the Bancorp's Unrecognized Tax Benefits (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Taxes [Abstract]
Unrecognized tax benefits at January 1	$ 18	$ 14	$ 16
Gross increases for tax positions taken during prior period	1	6	1
Gross decreases for tax positions taken during prior period	(7)	(3)	(2)
Gross increases for tax positions taken during current period	1	2
Settlements with taxing authorities	(5)
Lapse of applicable statute of limitations	(1)	(1)	(1)
Unrecognized tax benefits at December 31	$ 7	$ 18	$ 14