Summary of the Bancorp's Nonperforming Loans and Leases by Class (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012		Dec. 31, 2011		Mar. 31, 2011
Financing Receivable, Modifications [Line Items]
Loans held for sale	$ 1,584		$ 2,954		$ 1,291
OREO and other repossessed property	321	[1]	378	[1]	481	[1]
Government Insured [Member]
Financing Receivable, Modifications [Line Items]
OREO and other repossessed property	69		64		53
Non Accrual Loans [Member]
Financing Receivable, Modifications [Line Items]
Loans held for sale	$ 117		$ 138		$ 216

[1] Excludes $69, $64 and $53 of OREO related to government insured loans at March 31, 2012, December 31, 2011 and March 31, 2011, respectively.