Summary of Average Impaired Loans and Leases and Interest Income by Class (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 Recorded Investment	$ 2,963		$ 2,984	$ 2,829		$ 2,997
Interest Income Recognized	32		39	83		95
Commercial Portfolio Segment | Commercial and Industrial Loans
Average Recorded Investment	553		439	403		467
Interest Income Recognized	7		1	11		3
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner Occupied
Average Recorded Investment	145	[1]	168	140	[1]	157
Interest Income Recognized	1	[1]	1	3	[1]	3
Commercial Portfolio Segment | Commercial Mortgage Loans, Non Owner Occupied
Average Recorded Investment	322		387	326		356
Interest Income Recognized	2		3	6		7
Commercial Portfolio Segment | Commercial Construction
Average Recorded Investment	103		149	109		176
Interest Income Recognized	1			3		2
Commercial Portfolio Segment | Commercial Leases
Average Recorded Investment	8		10	10		10
Residential Mortgage Loans
Average Recorded Investment	1,311		1,276	1,308		1,269
Interest Income Recognized	13		13	39		38
Consumer Portfolio Segment | Home Equity
Average Recorded Investment	426		438	433		440
Interest Income Recognized	6		19	17		37
Consumer Portfolio Segment | Automobile Loan
Average Recorded Investment	27		37	29		39
Interest Income Recognized	1		1	1		2
Consumer Portfolio Segment | Credit Card
Average Recorded Investment	66		78	69		81
Interest Income Recognized	1		1	3		3
Consumer Portfolio Segment | Consumer Other Financing Receivable
Average Recorded Investment	$ 2		$ 2	$ 2		$ 2

[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.