v3.25.2
Cover
 6 Months Ended
Jun. 30, 2025
shares
Cover [Abstract]  
Document Type 10-Q
Document Quarterly Report true
Document Period End Date Jun. 30, 2025
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 Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Filer Category Non-accelerated Filer
Entity Small Business false
Entity Emerging Growth false
Entity Shell Company false
Entity Common Stock, Shares Outstanding (in shares) 0
Entity Central Index Key 0000068622
Current Fiscal Year End Date --12-31
Document Fiscal Year Focus 2025
Document Fiscal Period Focus Q2
Amendment Flag false
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