Schedule III: Real Estate and Accumulated Depreciation - Amount that Tax Basis of Net Real Estate Assets Less Than the Reported Amounts (Details) $ in Billions	12 Months Ended
	Dec. 31, 2018 USD ($)
SEC Schedule, 12-28, Real Estate Companies, Investment in 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	$ 1.0