Summary of the Bancorp's Activities with its Principal Shareholders, Directors and Executives (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Related Party Transaction [Line Items]
Commitments to lend, net of participations	$ 4,281
Outstanding balance on loans, net of participations and undrawn commitments	93	172
Commitments to Extend Credit [Member]
Related Party Transaction [Line Items]
Commitments to lend, net of participations	53,403	47,719
Commitments to Extend Credit [Member] \| Due To Related Party [Member]
Related Party Transaction [Line Items]
Commitments to lend, net of participations	367	259
Commitments to Extend Credit [Member] \| Due To Related Party [Member] \| Director [Member]
Related Party Transaction [Line Items]
Commitments to lend, net of participations	364	254
Commitments to Extend Credit [Member] \| Due To Related Party [Member] \| Executive Officer [Member]
Related Party Transaction [Line Items]
Commitments to lend, net of participations	$ 3	$ 5

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents commitments outstanding as of the balance sheet date which obligate or represent potential claims against the assets of the Company relating to, for example, the extension of credit. Further, commitments generally represent off balance sheet arrangements that obligate the entity to deliver assets or services or enter into another obligation in the future.

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For an unclassified balance sheet, amounts due from related parties including affiliates, employees, joint ventures, officers and stockholders, immediate families thereof, and pension funds.

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