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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% |

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