Summary of Average Impaired Loans and Leases and Interest Income by Class (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012
Average impaired loans	$ 2,963		$ 2,984	$ 2,829		$ 2,997
Interest Income Recognized	32		39	83		95
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner Occupied
Average impaired loans	145	[1]	168	140	[1]	157
Interest Income Recognized	1	[1]	1	3	[1]	3
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner Occupied | Variable Interest Entity, Primary Beneficiary
Average impaired loans	$ 29			$ 30

[1] Excludes five restructured nonaccrual loans, associated with a consolidated variable interest entity in which the Bancorp has no continuing credit risk due to the risk being assumed by a third party, with an average recorded investment of $29 and $30 and an immaterial amount of interest income recognized for the three and nine months ended September 30, 2013, respectively.