Commitments and Guarantees (Analysis of Commercial Mortgage Recourse Obligations) (Details) - Guarantee Of Indebtedness Of Others [Member] - Commercial Mortgage [Member] - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2015	Jun. 30, 2014
Loss Contingencies [Line Items]
Reserves, Beginning balance	$ 35	$ 33
Reserve adjustments, net	0	2
Reserves, Ending balance	$ 35	$ 35

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

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