Guarantee Arrangements and Pledged Assets and Collateral - Outstanding Repurchase Demands Received From GSEs and Other Third Parties (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]
GSEs	$ 6		$ 41
Others	1		3
Total	$ 7	[1]	$ 44	[1]

[1] Includes repurchase demands on loans sourced from our legacy broker channel of $4 million and $26 million at March 31, 2014 and December 31, 2013, respectively.