Asset Transfers in Which the Company has Continuing Economic Involvement (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2014		Dec. 31, 2013
Servicing or management fees	$ 2		$ 3
Residential Mortgage
Cash flows on interests held	4	[1],[2]	6	[1],[2]
Servicing or management fees	0	[1],[2]	1	[1],[2]
Commercial and Corporate Loans [Member]
Servicing or management fees	$ 2	[1]	$ 2	[1]

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

[2] Does not include GSE mortgage loan transfers