Schedule III - Real Estate and Accumulated Depreciation (Details) $ in Billions	12 Months Ended
Dec. 31, 2015 USD ($)
Schedule III - Real Estate and Accumulated Depreciation (Details) [Line Items]
SEC Schedule III, Real Estate, Federal Income Tax Basis (in Dollars)	$ 9.3
Minimum [Member] \| Buildings Held for Investment [Member]
Schedule III - Real Estate and Accumulated Depreciation (Details) [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	15 years
Maximum [Member] \| Buildings Held for Investment [Member]
Schedule III - Real Estate and Accumulated Depreciation (Details) [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation	50 years

Useful life on which depreciation was computed for entities with a substantial portion of business acquiring and holding investment real estate, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section S99
-Paragraph 6
-Subparagraph (SX 210.5-04.(c) Schedule III)
-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 970
-SubTopic 360
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-28)
-URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024

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