Asset Quality - Allowance for Loan and Lease Losses (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Disclosure Asset Quality Allowance For Loan And Lease Losses [Abstract]
Balance at beginning of period - continuing operations	$ 893	$ 944	$ 888	$ 1,004
Charge-offs	(74)	(131)	(164)	(263)
Recoveries	29	54	70	85
Net loans and leases charged off	(45)	(77)	(94)	(178)
Provision for loan and lease losses from continuing operations	28	21	83	63
Foreign currency translation adjustment			(1)	(1)
Balance at end of period - continuing operations	$ 876	$ 888	$ 876	$ 888