Commitments and Guarantees (Analysis of Commercial Mortgage Recourse Obligations) (Details) (Recourse Obligations [Member], Commercial Mortgage [Member], USD $) In Millions, unless otherwise specified	9 Months Ended
Sep. 30, 2014	Sep. 30, 2013
Recourse Obligations [Member] \| Commercial Mortgage [Member]
Loss Contingencies [Line Items]
Reserves, Beginning balance	$ 33	$ 43
Reserve adjustments, net	3	(5)
Reserves, Ending balance	$ 36	$ 38

Amount charged against operating income increasing loss contingency liability, after adjustments to reduce previously estimated charges.

Reference 1: 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=25496072&loc=d3e14326-108349

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