Asset Transfers in Which the Company has Continuing Economic Involvement (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013
Cash flows on interests held	$ (2)	$ (8)	$ (14)		$ (26)
Servicing or management fees	0	3	5		9
Residential Mortgage [Member]
Cash flows on interests held	(2)	(8)	(13)	[1],[2]	(24)
Servicing or management fees	0	1	1	[1],[2]	2
Commercial and Corporate Loans [Member]
Cash flows on interests held	0	0	0		(1)
Servicing or management fees	0	2	4	[1]	7
Collateralized Debt Obligations [Member]
Cash flows on interests held	0	0	(1)		(1)
Residential Mortgage [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Loans and Leases Receivable, Gain (Loss) on Sales, Net	$ 50	$ (169)	$ 155		$ 112

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

[2] Does not include GSE mortgage loan transfers