v3.26.1
Long-Term Debt and Credit Facilities - Subsequent Event - Revolving Credit Agreement and Exchange Offers (Details) - Subsequent Event
$ in Millions
Apr. 14, 2026
USD ($)
Apr. 20, 2026
USD ($)
Financial Guarantee | Level 3 Collateral Guarantors    
Long-term Debt and Credit Facilities    
Guaranteed amount $ 150  
Line of Credit | Maximum    
Long-term Debt and Credit Facilities    
Interest coverage ratio 2.00  
Line of Credit | Revolving Credit Facility    
Long-term Debt and Credit Facilities    
Maximum borrowing capacity $ 825  
Debt instrument, floor interest rate (as a percent) 0.00%  
Maximum total net leverage ratio 5.25  
Line of Credit | Revolving Credit Facility | SOFR    
Long-term Debt and Credit Facilities    
Basis spread (as a percent) 2.75%  
Line of Credit | Revolving Credit Facility | Base Rate    
Long-term Debt and Credit Facilities    
Basis spread (as a percent) 1.75%  
Line of Credit | Revolving Credit Facility | Superpriority Revolving/Term A Credit Agreement    
Long-term Debt and Credit Facilities    
Outstanding debt $ 0  
Senior Notes | Old Notes - 6.500% Notes Due 2056 | Qwest Corporation    
Long-term Debt and Credit Facilities    
Debt instrument, face amount   $ 978
Stated interest rate (as a percent)   6.50%
Senior Notes | Old Notes - 6.75% Notes Due 2057 | Qwest Corporation    
Long-term Debt and Credit Facilities    
Debt instrument, face amount   $ 660
Stated interest rate (as a percent)   6.75%
Senior Notes | New Notes - 6.500% Notes Due 2056 | Qwest Corporation    
Long-term Debt and Credit Facilities    
Stated interest rate (as a percent)   6.50%
Senior Notes | New Notes - 6.750% Notes Due 2057 | Qwest Corporation    
Long-term Debt and Credit Facilities    
Stated interest rate (as a percent)   6.75%