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Long-Term Debt and Credit Facilities - Long Term Debt (Details)
 9 Months Ended 12 Months Ended
Sep. 30, 2025
USD ($)
subsidiary
Dec. 31, 2024
USD ($)
Sep. 29, 2025
USD ($)
Debt Disclosure [Abstract]      
Number of subsidiaries | subsidiary 3    
Long-term Debt and Credit Facilities      
Finance lease and other obligations $ 233,000,000 $ 254,000,000  
Unamortized discounts, net (404,000,000) (395,000,000)  
Unamortized debt issuance costs (152,000,000) (217,000,000)  
Total long-term debt 17,672,000,000 17,906,000,000  
Less current maturities (94,000,000) (412,000,000)  
Long-term debt, excluding current maturities $ 17,578,000,000 17,494,000,000  
Line of Credit | Series A Revolving Credit Facility      
Long-term Debt and Credit Facilities      
Basis spread (as a percent) 4.00%    
Long-term debt, gross $ 0 0  
Line of Credit | Series B Revolving Credit Facility      
Long-term Debt and Credit Facilities      
Basis spread (as a percent) 6.00%    
Long-term debt, gross $ 0 0  
Term Loan | Term Loan A      
Long-term Debt and Credit Facilities      
Basis spread (as a percent) 6.00%    
Long-term debt, gross $ 343,000,000 $ 357,000,000  
Long-term debt, weighted average interest rate 10.316% 10.573%  
Term Loan | Term Loan B-1      
Long-term Debt and Credit Facilities      
Basis spread (as a percent) 2.35%    
Long-term debt, gross $ 1,594,000,000 $ 1,606,000,000  
Long-term debt, weighted average interest rate 6.78% 7.037%  
Term Loan | Term Loan B-1 | Level 3 Financing, Inc.      
Long-term Debt and Credit Facilities      
Basis spread (as a percent)   6.56%  
Long-term debt, gross $ 0 $ 1,199,000,000  
Long-term debt, weighted average interest rate   11.133%  
Term Loan | Term Loan B-2      
Long-term Debt and Credit Facilities      
Basis spread (as a percent) 2.35%    
Long-term debt, gross $ 1,594,000,000 $ 1,606,000,000  
Long-term debt, weighted average interest rate 6.78% 7.037%  
Term Loan | Term Loan B-2 | Level 3 Financing, Inc.      
Long-term Debt and Credit Facilities      
Basis spread (as a percent)   6.56%  
Long-term debt, gross $ 0 $ 1,199,000,000  
Long-term debt, weighted average interest rate   11.133%  
Term Loan | Term Loan B      
Long-term Debt and Credit Facilities      
Basis spread (as a percent) 2.25%    
Long-term debt, gross $ 56,000,000 $ 56,000,000  
Long-term debt, weighted average interest rate 6.68% 6.937%  
Term Loan | Term Loan B-4      
Long-term Debt and Credit Facilities      
Basis spread (as a percent) 3.25%    
Term Loan | Term Loan B-4 | Level 3 Financing, Inc.      
Long-term Debt and Credit Facilities      
Basis spread (as a percent) 3.25%    
Long-term debt, gross $ 2,400,000,000 $ 0 $ 2,400,000,000
Long-term debt, weighted average interest rate 7.566%    
Term Loan | Tranche B 2027 Term Loan | Level 3 Financing, Inc.      
Long-term Debt and Credit Facilities      
Basis spread (as a percent) 1.75%    
Long-term debt, gross $ 12,000,000 $ 12,000,000  
Long-term debt, weighted average interest rate 6.18% 6.437%  
Senior Notes | Superpriority Notes Due on Various Dates      
Long-term Debt and Credit Facilities      
Long-term debt, gross $ 1,247,000,000 $ 1,247,000,000  
Senior Notes | Superpriority Notes Due on Various Dates | Minimum      
Long-term Debt and Credit Facilities      
Stated interest rate 4.125%    
Senior Notes | Superpriority Notes Due on Various Dates | Maximum      
Long-term Debt and Credit Facilities      
Stated interest rate 10.00%    
Senior Notes | First Lien Notes | Level 3 Financing, Inc.      
Long-term Debt and Credit Facilities      
Long-term debt, gross $ 4,425,000,000 3,846,000,000  
Senior Notes | First Lien Notes | Level 3 Financing, Inc. | Minimum      
Long-term Debt and Credit Facilities      
Stated interest rate 6.875%    
Senior Notes | First Lien Notes | Level 3 Financing, Inc. | Maximum      
Long-term Debt and Credit Facilities      
Stated interest rate 7.00%    
Senior Notes | Second Lien Notes | Level 3 Financing, Inc.      
Long-term Debt and Credit Facilities      
Long-term debt, gross $ 2,229,000,000 2,579,000,000  
Senior Notes | Second Lien Notes | Level 3 Financing, Inc. | Minimum      
Long-term Debt and Credit Facilities      
Stated interest rate 3.875%    
Senior Notes | Second Lien Notes | Level 3 Financing, Inc. | Maximum      
Long-term Debt and Credit Facilities      
Stated interest rate 4.875%    
Senior Notes | Senior Notes Maturing 2028-2042      
Long-term Debt and Credit Facilities      
Long-term debt, gross $ 1,296,000,000 1,428,000,000  
Senior Notes | Senior Notes Maturing 2028-2042 | Minimum      
Long-term Debt and Credit Facilities      
Stated interest rate 4.50%    
Senior Notes | Senior Notes Maturing 2028-2042 | Maximum      
Long-term Debt and Credit Facilities      
Stated interest rate 7.65%    
Senior Notes | Senior Notes Maturing 2028-2029 | Level 3 Financing, Inc.      
Long-term Debt and Credit Facilities      
Long-term debt, gross $ 894,000,000 964,000,000  
Senior Notes | Senior Notes Maturing 2028-2029 | Level 3 Financing, Inc. | Minimum      
Long-term Debt and Credit Facilities      
Stated interest rate 3.625%    
Senior Notes | Senior Notes Maturing 2028-2029 | Level 3 Financing, Inc. | Maximum      
Long-term Debt and Credit Facilities      
Stated interest rate 4.25%    
Senior Notes | Senior Notes Maturing 2030-2057 | Qwest Corporation      
Long-term Debt and Credit Facilities      
Long-term debt, gross $ 1,736,000,000 1,973,000,000  
Senior Notes | Senior Notes Maturing 2030-2057 | Qwest Corporation | Minimum      
Long-term Debt and Credit Facilities      
Stated interest rate 6.50%    
Senior Notes | Senior Notes Maturing 2030-2057 | Qwest Corporation | Maximum      
Long-term Debt and Credit Facilities      
Stated interest rate 7.75%    
Senior Notes | Senior Notes Maturing 2028-2031 | Qwest Capital Funding, Inc.      
Long-term Debt and Credit Facilities      
Long-term debt, gross $ 169,000,000 $ 192,000,000  
Senior Notes | Senior Notes Maturing 2028-2031 | Qwest Capital Funding, Inc. | Minimum      
Long-term Debt and Credit Facilities      
Stated interest rate 6.875%    
Senior Notes | Senior Notes Maturing 2028-2031 | Qwest Capital Funding, Inc. | Maximum      
Long-term Debt and Credit Facilities      
Stated interest rate 7.75%