Commitments and Guarantees (Analysis of Commercial Mortgage Recourse Obligations) (Details) (Commercial Mortgages [Member], Total Recourse Obligations [Member], USD $) In Millions	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010
Commercial Mortgages [Member] \| Total Recourse Obligations [Member]
Recourse/Repurchase obligations, beginning balance	$ 54	$ 71
Reserve adjustments, net	2	(16)
Losses - loan repurchases and settlements	(7)	(1)
Loan Sales		(24)
Recourse/Repurchase obligations, ending balance	$ 49	$ 30

The carrying amount as of the balance sheet date of the combined total of loss contingency liabilities.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 9, 10, 11, 12

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14326-108349

Name:	us-gaap_LossContingencyAccrualAtCarryingValue
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant