v3.26.3
Cover Page - shares
 9 Months Ended
Sep. 30, 2026
Oct. 30, 2026
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2026  
Document Transition Report false  
Entity File Number 001-07784  
Entity Registrant Name LUMEN TECHNOLOGIES, INC.  
Entity Incorporation, State or Country Code LA  
Entity Tax Identification Number 72-0651161  
Entity Address, Address Line One 100 CenturyLink Drive,  
Entity Address, City or Town Monroe,  
Entity Address, State or Province LA  
Entity Address, Postal Zip Code 71203  
City Area Code 318  
Local Phone Number 388-9000  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   1,031,042,677
Entity Central Index Key 0000018926  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q3  
Common Stock    
Document Information [Line Items]    
Title of 12(b) Security Common Stock, no par value per share  
Trading Symbol LUMN  
Security Exchange Name NASDAQ  
Guarantees of Qwest Corporation's 6.500% Senior Notes due 2051, denominations of $25    
Document Information [Line Items]    
Title of 12(b) Security Guarantees of Qwest Corporation's 6.500% Senior Notes due 2051, denominations of $25  
Trading Symbol CTGG  
Security Exchange Name NASDAQ  
Guarantees of Qwest Corporation's 6.750% Senior Notes due 2052, denominations of $25    
Document Information [Line Items]    
Title of 12(b) Security Guarantees of Qwest Corporation's 6.750% Senior Notes due 2052, denominations of $25  
Trading Symbol CTHH  
Security Exchange Name NASDAQ