Commitments and Contingencies (Narrative) (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended	0 Months Ended
Sep. 30, 2013 numberoflawsuits	May 02, 2013 Flagstar Bank [Member]
Commitment And Contingencies [Line Items]
Proceeds from legal settlements		$ 110
Other material lawsuits pending	0

Cash received for the settlement of litigation during the current period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 25

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585

Name:	us-gaap_ProceedsFromLegalSettlements
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration