Defined Benefit Retirement Plans with Overfunded and Underfunded Status (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Defined Benefit Plan Change In Fair Value Roll Forward [Abstract]
Fair value of plan assets at January 1	$ (185)	[1]
Fair value of plan assets at December 31	(200)	[1]	(185)	[1]
Defined Benefit Plan, Change in Benefit Obligation
Projected benefit obligation at January 1	32
Defined Benefit Plan, Interest Cost	10		10		11
Projected benefit obligation at December 31			32
Underfunded Defined Benefit Pension Plans
Defined Benefit Plan Change In Fair Value Roll Forward [Abstract]
Fair value of plan assets at January 1	185		181
Actual return on plan assets			21
Contributions	4		4
Settlement			(10)
Benefits paid	(4)		(11)
Fair value of plan assets at December 31			185
Defined Benefit Plan, Change in Benefit Obligation
Projected benefit obligation at January 1	256		253
Defined Benefit Plan, Interest Cost	1		10
Settlement			(10)
Actuarial (gain) loss	(2)		14
Benefits paid	(4)		(11)
Projected benefit obligation at December 31	27		256
Underfunded projected benefit obligation recognized in the Consolidated Balance Sheet as a liability	(27)		(71)
Overfunded Defined Benefit Plension Plans
Defined Benefit Plan Change In Fair Value Roll Forward [Abstract]
Fair value of plan assets at January 1	185	[2]
Actual return on plan assets	30	[2]
Contributions	5	[2]
Settlement	(13)	[2]
Benefits paid	(7)	[2]
Fair value of plan assets at December 31	200	[2]
Defined Benefit Plan, Change in Benefit Obligation
Projected benefit obligation at January 1	224	[2]
Defined Benefit Plan, Interest Cost	10	[2]
Settlement	(13)	[2]
Actuarial (gain) loss	(20)	[2]
Benefits paid	(7)	[2]
Projected benefit obligation at December 31	194	[2]
Overfunded projeted benefit obligation recognized in the Consolidated Balance Sheet as an asset	$ 6	[2]

[1] For further information on fair value hierarchy levels, see Note 1.

[2] The Bancorp’s defined benefit plan had an Overfunded status at December 31, 2013. The plan was Underfunded at December 31, 2012 and is reflected in the Underfunded Status table.