Summary of Transactions in the ALLL by Portfolio segment (Detail) (USD $) In Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2011		Jun. 30, 2010		Jun. 30, 2011		Jun. 30, 2010
Beginning Balance	$ 2,805		$ 3,802		$ 3,004	[1],[2]	$ 3,749
Losses charged off	(343)		(472)		(740)		(1,094)
Recoveries of losses previously charged off	39		38		69		78
Provision for loan and lease losses	113		325		281		915
Ending Balance	2,614	[2],[3]	3,693	[2]	2,614	[2],[3]	3,693	[2]
Commercial Portfolio Segment
Beginning Balance	1,855				1,989	[1]
Losses charged off	(158)				(334)
Recoveries of losses previously charged off	17				29
Provision for loan and lease losses	50				80
Ending Balance	1,764	[3]			1,764	[3]
Residential Mortgage Loans
Beginning Balance	286				310	[1]
Losses charged off	(37)				(104)
Recoveries of losses previously charged off	1				3
Provision for loan and lease losses	18				59
Ending Balance	268	[3]			268	[3]
Consumer Portfolio Segment
Beginning Balance	519				555	[1]
Losses charged off	(148)				(302)
Recoveries of losses previously charged off	21				37
Provision for loan and lease losses	60				162
Ending Balance	452	[3]			452	[3]
Unallocated (Member)
Beginning Balance	145				150	[1]
Provision for loan and lease losses	(15)				(20)
Ending Balance	$ 130	[3]			$ 130	[3]

[1] Includes $15 related to leverage leases.

[2] Includes $42, $52, and $74 of cash, $7, $7 and $7 of other short-term investments, $29, $29 and $0 of commercial mortgage loans, $231, $241 and $252 of home equity loans, $424, $648 and $911 of automobile loans, ($11), ($14) and ($16) of ALLL, $4, $7 and $7 of other assets, $8, $12 and $19 of other liabilities and $365, $692 and $996 of long-term debt from consolidated VIEs that are included in their respective captions above at June 30, 2011, December 31, 2010 and June 30, 2010, respectively. See Note 8.

[3] Includes $18 related to leverage leases.