Summary of Average Impaired Loans and Leases and Interest Income by Class (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Average Recorded Investment	$ 2,793		$ 2,993
Interest Income Recognized	26		24
Commercial Portfolio Segment | Commercial and Industrial Loans
Average Recorded Investment	339		494
Interest Income Recognized	2		1
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner Occupied
Average Recorded Investment	140	[1]	139
Interest Income Recognized	1		1
Commercial Portfolio Segment | Commercial Mortgage Loans, Non Owner Occupied
Average Recorded Investment	341		320
Interest Income Recognized	2		2
Commercial Portfolio Segment | Commercial Construction
Average Recorded Investment	110		202
Interest Income Recognized	1		1
Commercial Portfolio Segment | Commercial Leases
Average Recorded Investment	11		11
Residential Mortgage Loans
Average Recorded Investment	1,306		1,262
Interest Income Recognized	13		12
Consumer Portfolio Segment | Home Equity
Average Recorded Investment	439		444
Interest Income Recognized	6		6
Consumer Portfolio Segment | Automobile Loan
Average Recorded Investment	32		41
Consumer Portfolio Segment | Credit Card
Average Recorded Investment	73		80
Interest Income Recognized	1		1
Consumer Portfolio Segment | Consumer Other Financing Receivable
Average Recorded Investment	$ 2

[1] Excludes five restructured nonaccrual loans at March 31, 2013 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.