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Combined Guarantor Subsidiaries - Mortgage Notes Payable, Net - Net Mortgage Notes Payable (Parenthetical) (Details)	Jun. 30, 2020
Debt Disclosure [Abstract]
Non-recourse loan default additional interest rate above stated interest rate	3.00%

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- Definition

Non-recourse loan default additional interest rate above stated interest rate.

+ References

No definition available.

+ Details

Name:	cbl_NonRecourseLoanDefaultAdditionalInterestRateAboveStatedInterestRate
Namespace Prefix:	cbl_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_DebtDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration