Summary of the Bancorp's Activities with its Principal Shareholders, Directors and Executives (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Related Party Transaction [Line Items]
Commitments to Extend Credit	$ 62,050	$ 53,403
Outstanding balance on loans, net of participations and undrawn commitments	86	93
Commitments to Extend Credit [Member]
Related Party Transaction [Line Items]
Commitments to Extend Credit	62,050	53,403
Commitments to Extend Credit [Member] | Due To Related Party [Member]
Related Party Transaction [Line Items]
Commitments to Extend Credit	588	367
Commitments to Extend Credit [Member] | Due To Related Party [Member] | Director [Member]
Related Party Transaction [Line Items]
Commitments to Extend Credit	586	364
Commitments to Extend Credit [Member] | Due To Related Party [Member] | Executive Officer [Member]
Related Party Transaction [Line Items]
Commitments to Extend Credit	$ 2	$ 3