Guarantee Arrangements and Pledged Assets and Collateral - Outstanding Repurchase Demands Received From GSEs and Other Third Parties (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]
GSEs	$ 3		$ 41
Others	0		3
Total	$ 3	[1]	$ 44	[1]

[1] Includes repurchase demands on loans sourced from our legacy broker channel of $1 million and $26 million at June 30, 2014 and December 31, 2013, respectively.