Summary of Average Impaired Loans and Leases and Interest Income by Class (Detail) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Average Recorded Investment	$ 2,980	$ 3,300	$ 2,963	$ 3,200
Interest Income Recognized	55	67	103	111
Commercial Portfolio Segment | Commercial and Industrial Loans
Average Recorded Investment	521		495
Interest Income Recognized	12		25
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner Occupied
Average Recorded Investment	121		126
Interest Income Recognized	5		10
Commercial Portfolio Segment | Commercial Mortgage Loans, Non Owner Occupied
Average Recorded Investment	280		290
Interest Income Recognized	8		16
Commercial Portfolio Segment | Commercial Construction
Average Recorded Investment	197		183
Interest Income Recognized	6		11
Commercial Portfolio Segment | Commercial Leases
Average Recorded Investment	19		23
Residential Mortgage Loans
Average Recorded Investment	1,222		1,209
Interest Income Recognized	11		21
Consumer Portfolio Segment | Home Equity
Average Recorded Investment	440		444
Interest Income Recognized	11		17
Consumer Portfolio Segment | Credit Card
Average Recorded Investment	100		98
Interest Income Recognized	1		2
Consumer Portfolio Segment | Consumer Other Financing Receivable
Average Recorded Investment	40		56
Consumer Portfolio Segment | Automobile Loan
Average Recorded Investment	40		39
Interest Income Recognized	$ 1		$ 1