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Cover - USD ($)
 12 Months Ended
Dec. 31, 2024
Jun. 30, 2024
Cover [Abstract]    
Document Type 10-K  
Document Annual Report true  
Document Period End Date Dec. 31, 2024  
Current Fiscal Year End Date --12-31  
Document Transition Report false  
Entity File Number 001-03040  
Entity Registrant Name QWEST CORPORATION  
Entity Incorporation, State or Country Code CO  
Entity Tax Identification Number 84-0273800  
Entity Address, Address Line One 931 14th Street,  
Entity Address, City or Town Denver,  
Entity Address, State or Province CO  
Entity Address, Postal Zip Code 80202  
City Area Code 318  
Local Phone Number 388-9000  
Entity Information [Line Items]    
Entity Well-known Seasoned Issuer No  
Entity Voluntary Filers No  
Entity Current Reporting Status Yes  
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 false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding 0  
Documents Incorporated by Reference
DOCUMENTS INCORPORATED BY REFERENCE: None.
  
Entity Central Index Key 0000068622  
Amendment Flag false  
Entity Public Float   $ 0
Document Fiscal Year Focus 2024  
Document Fiscal Period Focus FY  
6.5% Notes Due 2056    
Entity Information [Line Items]    
Title of 12(b) Security 6.5% Notes Due 2056  
Trading Symbol(s) CTBB  
Security Exchange Name NYSE  
6.75% Notes Due 2057    
Entity Information [Line Items]    
Title of 12(b) Security 6.75% Notes Due 2057  
Trading Symbol(s) CTDD  
Security Exchange Name NYSE