Net Funded Status (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Net underfunded status	$ (52)	$ (21)
Underfunded Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Accrued benefit liability	(52)	(27)
Overfunded Defined Benefit Plension Plans
Defined Benefit Plan Disclosure [Line Items]
Prepaid benefit cost		$ 6	[1]

[1] The Bancorp’s defined benefit plan had an Overfunded status at December 31, 2013. The plan was Underfunded at December 31, 2014 and is reflected in the Underfunded Status table.