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Combined Guarantor Subsidiaries - Organization and Basis of Presentation - Narrative (Details)
Dec. 31, 2019
USD ($)
state
mall
associated_center
subsidiary
mortgage_note_receivable
senior_unsecured_note
Jan. 01, 2019
USD ($)
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]    
Number of states in which entity operates | state 26  
Number of Malls Securing Credit Facility, Collateral | mall 17  
Number of Associated Centers Securing Credit Facility, Collateral | associated_center 3  
Line of Credit | Secured Debt    
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]    
Balance of Non-recourse Debt | $   $ 1,185,000,000
Guarantor Subsidiaries    
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]    
Number of states in which entity operates | state 26  
Number of Malls Securing Credit Facility, Collateral | mall 17  
Number of Associated Centers Securing Credit Facility, Collateral | associated_center 3  
Number of wholly owned subsidiaries | subsidiary 36  
Number of malls not classified as collateral for the secured credit facility | mall 5  
Number of associated centers not classified as collateral for the secured credit facility | associated_center 2  
Number of Mortgage Notes Receivable not Classified as Collateral | mortgage_note_receivable 4  
Guarantor Subsidiaries | Line of Credit | Secured Debt    
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]    
Balance of Non-recourse Debt | $ $ 1,185,000,000 $ 1,185,000,000
Guarantor Subsidiaries | Senior Unsecured Notes    
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]    
Balance of Non-recourse Debt | $ $ 1,375,000,000  
Debt Instrument, Number Of Instruments | senior_unsecured_note 3