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Cover - USD ($)
 12 Months Ended
Dec. 31, 2023
Jun. 30, 2023
Cover [Abstract]    
Document Type 10-K  
Document Annual Report true  
Document Period End Date Dec. 31, 2023  
Current Fiscal Year End Date --12-31  
Document Transition Report false  
Entity File Number 001-35134  
Entity Registrant Name LEVEL 3 PARENT, LLC  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 47-0210602  
Entity Address, Address Line One 1025 Eldorado Blvd.,  
Entity Address, City or Town Broomfield,  
Entity Address, State or Province CO  
Entity Address, Postal Zip Code 80021-8869  
City Area Code 720  
Local Phone Number 888-1000  
Entity Well-known Seasoned Issuer No  
Entity Voluntary Filers Yes  
Entity Current Reporting Status No  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
ICFR Auditor Attestation Flag false  
Document Financial Statement Error Correction [Flag] true  
Document Financial Statement Restatement Recovery Analysis [Flag] false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding 0  
Documents Incorporated by Reference
DOCUMENTS INCORPORATED BY REFERENCE: None.
  
Entity Public Float   $ 0
Entity Central Index Key 0000794323  
Amendment Flag false  
Document Fiscal Year Focus 2023  
Document Fiscal Period Focus FY