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Schedule III - Real Estate and Accumulated Depreciation - Summary (Details)
$ in Billions
12 Months Ended
Dec. 31, 2017
USD ($)
Schedule III - Real Estate and Accumulated Depreciation [Line Items]  
SEC Schedule III, Real Estate, Federal Income Tax Basis (in Dollars) $ 2.8
Minimum | Building  
Schedule III - Real Estate and Accumulated Depreciation [Line Items]  
PPE useful life (in years) 39 years
Minimum | Building Improvements  
Schedule III - Real Estate and Accumulated Depreciation [Line Items]  
PPE useful life (in years) 10 years
Maximum | Building  
Schedule III - Real Estate and Accumulated Depreciation [Line Items]  
PPE useful life (in years) 40 years
Maximum | Building Improvements  
Schedule III - Real Estate and Accumulated Depreciation [Line Items]  
PPE useful life (in years) 20 years