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Organization and Basis of Presentation - Narrative (Details)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Nov. 02, 2020
Aug. 18, 2020
USD ($)
Aug. 31, 2020
shares
Jul. 31, 2020
shares
Mar. 31, 2020
shares
Sep. 30, 2020
state
subsidiary
shares
Mar. 31, 2020
shares
Sep. 30, 2020
state
subsidiary
shares
Dec. 31, 2019
Consolidation Less Than Wholly Owned Subsidiary Parent Ownership Interest Effects Of Changes Net [Line Items]                  
Number of states in which entity operates | state           26   26  
Number of wholly owned subsidiaries | subsidiary           36   36  
Conversion of Operating Partnership common units into common stock (shares) | shares           3,814,729 16,333,947    
Restructuring Support Agreement                  
Consolidation Less Than Wholly Owned Subsidiary Parent Ownership Interest Effects Of Changes Net [Line Items]                  
Principal amount of unsecured notes   $ 1,375,000,000              
New senior secured notes maturity date   2028-06              
Issuance of new senior secured notes due June 2028   $ 500,000,000              
Cash   $ 50,000,000              
Percentage of issuance of new common equity to holders of unsecured notes   90.00%              
Elimination of debt as result of implementation of plan   $ 900,000,000              
Elimination of obligation on preferred stock in exchange for new common equity and warrants   $ 626,250,000              
Restructuring Support Agreement | Minimum                  
Consolidation Less Than Wholly Owned Subsidiary Parent Ownership Interest Effects Of Changes Net [Line Items]                  
Aggregate principal amount of operating partnership   62.00%              
Reduction in annual interest expense   $ 20,000,000              
Restructuring Support Agreement | Maximum                  
Consolidation Less Than Wholly Owned Subsidiary Parent Ownership Interest Effects Of Changes Net [Line Items]                  
Elimination of obligation on preferred stock in exchange for new common equity and warrants in cash   $ 5,000,000              
7.375% Series D Cumulative Redeemable Preferred Stock, $0.01 par value                  
Consolidation Less Than Wholly Owned Subsidiary Parent Ownership Interest Effects Of Changes Net [Line Items]                  
Dividend rate of preferred stock (as a percent)               7.375% 7.375%
6.625% Series E Cumulative Redeemable Preferred Stock, $0.01 par value                  
Consolidation Less Than Wholly Owned Subsidiary Parent Ownership Interest Effects Of Changes Net [Line Items]                  
Dividend rate of preferred stock (as a percent)               6.625% 6.625%
COVID 19 | 7.375% Series D Cumulative Redeemable Preferred Stock, $0.01 par value | Subsequent Event                  
Consolidation Less Than Wholly Owned Subsidiary Parent Ownership Interest Effects Of Changes Net [Line Items]                  
Dividend rate of preferred stock (as a percent) 7.375%                
COVID 19 | 6.625% Series E Cumulative Redeemable Preferred Stock, $0.01 par value | Subsequent Event                  
Consolidation Less Than Wholly Owned Subsidiary Parent Ownership Interest Effects Of Changes Net [Line Items]                  
Dividend rate of preferred stock (as a percent) 6.625%                
Consolidated Properties                  
Consolidation Less Than Wholly Owned Subsidiary Parent Ownership Interest Effects Of Changes Net [Line Items]                  
Non-controlling limited partner interest of third parties in Operating partnership (as a percent)           2.90%   2.90%  
Common stock owned by CBL's Predecessor (shares) | shares           20,100,000   20,100,000  
Total combined effective interest of CBL's Predecessor in Operating Partnership (as a percent)           10.00%   10.00%  
CBL Associates Properties Inc | Consolidated Properties                  
Consolidation Less Than Wholly Owned Subsidiary Parent Ownership Interest Effects Of Changes Net [Line Items]                  
Conversion of Operating Partnership common units into common stock (shares) | shares     1,783,403 1,783,403 16,333,947        
Consolidated Properties | CBL Holdings                  
Consolidation Less Than Wholly Owned Subsidiary Parent Ownership Interest Effects Of Changes Net [Line Items]                  
Ownership interest in qualified subsidiaries (as a percent)           100.00%   100.00%  
CBL & Associates Limited Partnership                  
Consolidation Less Than Wholly Owned Subsidiary Parent Ownership Interest Effects Of Changes Net [Line Items]                  
Number of wholly owned subsidiaries | subsidiary           2   2  
Combined ownership by the subsidiaries in operating partnership (as a percent)           97.10%   97.10%  
CBL & Associates Limited Partnership | CBL Associates Properties Inc                  
Consolidation Less Than Wholly Owned Subsidiary Parent Ownership Interest Effects Of Changes Net [Line Items]                  
Ownership of the sole general partner in partnership (as a percent)               1.00%  
Limited partnership interest owned by CBL Holdings II, Inc. in the operating partnership (as a percent)               96.10%