Acquisitions (Narratives) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014 St. Regis Hotel [Member] Retail Condominium [Member]	Oct. 28, 2014 St. Regis Hotel [Member] Retail Condominium [Member] Subsequent Event [Member]	Aug. 01, 2014 Lexington Avenue 715 Retail [Member]
Business Acquisition [Line Items]
Cost of acquired entity purchase price		$ 700	$ 63
Equity method ownership percentage		75.00%
Non Refundable Deposit Made By Venture	$ 50

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The carrying amount of the asset transferred to a third party to serve as a deposit, which typically serves as security against failure by the transferor to perform under terms of an agreement.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 17

-Article 5

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 8

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.8,17)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

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- Definition

Business Acquisition Total Cost Of Acquired Entity Purchase Price

+ References

No definition available.

+ Details

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