Asset Transfers in Which the Company has Continuing Economic Involvement (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended			12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014		Jun. 30, 2013	Dec. 31, 2012
Cash flows on interests held		$ (12)	$ (7)		$ (19)	$ (10)
Servicing or management fees		3	1		6	5
Residential Mortgage [Member]
Cash flows on interests held	(7)	(11)	(10)	[1],[2]	(17)
Servicing or management fees	0	1	1	[1],[2]	1
Commercial and Corporate Loans [Member]
Cash flows on interests held	0	0			(1)	0
Servicing or management fees	1	2	4	[2]	5
Collateralized Debt Obligations [Member]
Cash flows on interests held	0	(1)			(1)	0
Residential Mortgage [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Loans and Leases Receivable, Gain (Loss) on Sales, Net	$ 61	$ 124	$ 105		$ 281

[1] Does not include GSE mortgage loan transfers

[2] The transfer activity is related to unconsolidated VIEs.