Asset Quality - Allowance for Loan and Lease Losses (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
Receivables [Abstract]
Balance at beginning of period - continuing operations	$ 876	$ 888	$ 888	$ 1,004
Charge-offs	(78)	(141)	(242)	(404)
Recoveries	41	32	111	117
Net loans and leases charged off	(37)	(109)	(131)	(287)
Provision for loan and lease losses from continuing operations	28	109	111	172
Foreign currency translation adjustment	1			(1)
Balance at end of period - continuing operations	$ 868	$ 888	$ 868	$ 888