Summary of Average Impaired Loans and Leases and Interest Income by Class (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012	Jun. 30, 2013		Jun. 30, 2012
Average impaired loans	$ 2,734		$ 3,012	$ 2,766		$ 3,005
Interest Income Recognized	25		32	51		56
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner Occupied
Average impaired loans	136	[1]	164	138	[1]	152
Interest Income Recognized	1	[1]	1	2	[1]	2
Commercial Portfolio Segment | Variable Interest Entity, Primary Beneficiary | Commercial Mortgage Loans, Owner Occupied
Average impaired loans	$ 30			$ 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 $30 and an immaterial amount of interest income recognized for the three and six months ended June 30, 2013.