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Long-Term Debt and Credit Facilities - Repayments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Long-term Debt and Credit Facilities    
Repayments of debt $ 6,200 $ 3,600
Gain (loss) on extinguishment of debt   72
Senior Notes    
Long-term Debt and Credit Facilities    
Gain (loss) on extinguishment of debt (109)  
Debt instrument, periodic payment   398
Senior Notes | Amended Credit Agreement    
Long-term Debt and Credit Facilities    
Gain (loss) on extinguishment of debt (67)  
Term Loan    
Long-term Debt and Credit Facilities    
Debt instrument, periodic payment   164
Lumen Technologies    
Long-term Debt and Credit Facilities    
Repayments of debt 1,300 340
Lumen Technologies | Senior Notes    
Long-term Debt and Credit Facilities    
Payment of aggregate principal amount at maturity 973  
Lumen Technologies | Term Loan    
Long-term Debt and Credit Facilities    
Repayments of debt 125  
Lumen Technologies | Senior Notes    
Long-term Debt and Credit Facilities    
Repayments of debt 78  
Qwest Corporation | Senior Notes    
Long-term Debt and Credit Facilities    
Repayments of debt 2,800  
Level 3 Financing, Inc.    
Long-term Debt and Credit Facilities    
Repayments of debt   2,300
Level 3 Financing, Inc. | Senior Notes    
Long-term Debt and Credit Facilities    
Repayments of debt $ 2,000  
Level 3 Parent, LLC    
Long-term Debt and Credit Facilities    
Repayments of debt   600
Qwest Capital Funding, Inc    
Long-term Debt and Credit Facilities    
Repayments of debt   $ 345