Activity Related to "Senior, mezzanine, and other loans" Notes Receivable Reserve (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2013
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	$ 79
Transfers and other	2
Ending balance	$ 81

A valuation allowance for financing receivables that are expected to be uncollectible.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524

Name:	us-gaap_FinancingReceivableAllowanceForCreditLosses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant