Summary of Transactions in the ALLL by Portfolio segment (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Beginning Balance	$ 1,582	[1]	$ 1,854
Losses charged off	(190)		(168)
Recoveries of losses previously charged off	22		35
Provision for loan and lease losses	69		62
Ending Balance	1,483	[1]	1,783
Commercial Portfolio Segment
Beginning Balance	1,058	[2]	1,236
Losses charged off	(110)		(68)
Recoveries of losses previously charged off	5		14
Provision for loan and lease losses	28		9
Ending Balance	981	[3]	1,191
Residential Mortgage Loans
Beginning Balance	189	[2]	229
Losses charged off	(19)		(22)
Recoveries of losses previously charged off	4		2
Provision for loan and lease losses	6		3
Ending Balance	180	[3]	212
Consumer Portfolio Segment
Beginning Balance	225	[2]	278
Losses charged off	(61)		(78)
Recoveries of losses previously charged off	13		19
Provision for loan and lease losses	40		53
Ending Balance	217	[3]	272
Unallocated
Beginning Balance	110	[2]	111
Provision for loan and lease losses	(5)		(3)
Ending Balance	$ 105	[3]	$ 108

[1] Includes $102 and $49 of cash and due from banks, $7 and $0 of other short-term investments, $48 and $48 of commercial mortgage loans, $2,031 and $1,010 of automobile loans, $(18) and $(15) of ALLL, $23 and $13 of other assets, $3 and $1 of other liabilities, and $2,119 and $1,048 of long-term debt from consolidated VIEs that are included in their respective captions above at March 31, 2014 and December 31, 2013, respectively. See Note 8.

[2] Includes $9 related to leveraged leases.

[3] Includes $8 related to leveraged leases.