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Schedule III: Real Estate and Accumulated Depreciation - Amount that Tax Basis of Net Real Estate Assets Less Than the Reported Amounts (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)
SEC Schedule III, Real Estate and Accumulated Depreciation Disclosure [Abstract]
Life on Which Depreciation in Latest Income Statement is Computed	60 years
Amount that the tax basis of the Company's net real estate is less than the reported amounts	$ 900

X

- Definition

The amount by which the tax basis of the entity's net real estate is less than the reported amounts as of year-end.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- Definition

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.

+ References

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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