Subsequent Event (Details) (Subsequent Event [Member], JPMorgan Chase & Co [Member], USD $) In Millions, unless otherwise specified	0 Months Ended
Oct. 25, 2013
Mortgage-backed Private-Label Securities [Member]
Subsequent Event [Line Items]
Proceeds from settlement with a counterparty	$ 1,300
Repurchase Request Resolution Agreement [Member]
Subsequent Event [Line Items]
Proceeds from settlement with a counterparty	$ 670

Amount of judgment or settlement awarded to (against) the entity in respect of litigation.

No definition available.

Name:	us-gaap_LitigationSettlementAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration