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Long-Term Debt and Credit Facilities - Repayments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 01, 2021
Feb. 16, 2021
Dec. 31, 2021
Dec. 31, 2020
Long-term Debt and Credit Facilities        
Redemptions of debt     $ 1,100 $ 6,200
Repayments of debt     2,800  
Gain (loss) on extinguishment of debt     8  
Senior Notes        
Long-term Debt and Credit Facilities        
Gain (loss) on extinguishment of debt       (109)
Senior Notes | Amended Credit Agreement        
Long-term Debt and Credit Facilities        
Gain (loss) on extinguishment of debt     67 (67)
Term Loan        
Long-term Debt and Credit Facilities        
Repayments of debt     125  
Level 3 Financing, Inc. | Senior Notes        
Long-term Debt and Credit Facilities        
Redemptions of debt     900 2,000
Qwest Corporation | Senior Notes        
Long-term Debt and Credit Facilities        
Redemptions of debt   $ 235   2,800
Repayments of debt $ 950      
Lumen Technologies, Inc.        
Long-term Debt and Credit Facilities        
Redemptions of debt       1,300
Lumen Technologies, Inc. | Senior Notes        
Long-term Debt and Credit Facilities        
Payment of aggregate principal amount at maturity       973
Lumen Technologies, Inc. | Term Loan        
Long-term Debt and Credit Facilities        
Repayments of debt       125
Lumen Technologies, Inc. | Senior Notes        
Long-term Debt and Credit Facilities        
Redemptions of debt       $ 78
Repayments of debt     1,200  
Qwest Capital Funding, Inc. | Senior Notes        
Long-term Debt and Credit Facilities        
Repayments of debt     $ 97