Asset Transfers in Which the Company has Continuing Economic Involvement (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Cash flows on interests held	$ 36		$ 30		$ 51
Servicing or management fees	11		13		13
Residential Mortgage
Cash flows on interests held	32	[1],[2]	27	[1],[2]	48	[1],[2]
Servicing or management fees	2	[1],[2]	3	[1],[2]	3	[1],[2]
Commercial and Corporate Loans [Member]
Cash flows on interests held	1	[1]	1	[1]	1	[1]
Servicing or management fees	9	[1]	10	[1]	10	[1]
Collateralized Debt Obligations [Member]
Cash flows on interests held	$ 3	[1]	$ 2	[1]	$ 2	[1]

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

[2] Does not include GSE mortgage loan transfers