Commitments and Guarantees (Analysis of Commercial Mortgage Recourse Obligations) (Details) (Commercial Mortgages [Member], Total Recourse Obligations [Member], USD $) In Millions	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010
Commercial Mortgages [Member] \| Total Recourse Obligations [Member]
Recourse obligations, beginning balance	$ 54	$ 71
Reserve adjustments, net	4	(8)
Losses - loan repurchases and settlements	(3)
Loan Sales		(24)
Recourse obligations, ending balance	$ 55	$ 39

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

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

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant