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Mall Activities - Additional Information (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Jun. 24, 2011
Feb. 29, 2008
May 31, 2004
Apr. 30, 2004
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Mall Activities [Line Items]              
Operating leases, contingent rentals         $ 88 $ 48 $ 36
The Grand Canal Shoppes [Member]              
Mall Activities [Line Items]              
Operating leases, term of contract       89 years      
Mall sale, proceeds       $ 766      
Mall sale, realized gain     $ 418        
Mall sale, deferred rent     109        
Amortization of deferred rent, recognized         1 1 1
Net present value of the lease payments     $ 77        
Amortization of deferred gain, recognized         3 $ 3 $ 3
The Grand Canal Shoppes [Member] | Theater Space [Member]              
Mall Activities [Line Items]              
Sales leaseback, term of lease       25 years      
Sales leaseback, annual rental payments       $ 3      
The Grand Canal Shoppes [Member] | Gondola Ride [Member]              
Mall Activities [Line Items]              
Sales leaseback, term of lease       25 years      
Sales leaseback, annual rental payments       $ 4      
The Grand Canal Shoppes [Member] | Office Space [Member]              
Mall Activities [Line Items]              
Sales leaseback, term of lease       10 years      
Sales leaseback, annual rental payments       $ 1      
Sales leaseback, term of lease, extension option       65 years      
The Shoppes At The Palazzo [Member]              
Mall Activities [Line Items]              
Operating leases, term of contract   89 years          
Mall sale, proceeds $ 295            
Mall sale, deferred rent   $ 23          
Mall sale, deferred proceeds         $ 265    
Minimum [Member]              
Mall Activities [Line Items]              
Operating leases, term of contract         1 month    
Maximum [Member]              
Mall Activities [Line Items]              
Operating leases, term of contract         18 years