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Long-Term Debt and Revolving Promissory Note - Schedule of Long-Term Debt (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Long-term debt    
Long-term debt, gross $ 6,066  
Finance leases 10 $ 21
Unamortized (discounts) premiums, net 0 (1)
Unamortized debt issuance costs (115) (117)
Total long-term debt 5,951 5,959
Less current maturities (1,105) (11)
Long-term debt, excluding current maturities 4,846 5,948
Note payable - affiliate 1,069 1,008
Senior notes | Qwest Corporation    
Long-term debt    
Long-term debt, gross $ 5,956 $ 5,956
Senior notes | Qwest Corporation | Minimum    
Long-term debt    
Interest rate, stated percentage (as a percent) 6.125%  
Senior notes | Qwest Corporation | Maximum    
Long-term debt    
Interest rate, stated percentage (as a percent) 7.75%  
Term loan    
Long-term debt    
Interest rate on term loan 3.80% 4.53%
Term loan | Qwest Corporation    
Long-term debt    
Long-term debt, gross $ 100 $ 100
Term loan | Qwest Corporation | London Interbank Offered Rate (LIBOR)    
Long-term debt    
Interest rate margin (as a percent) 2.00%  
Revolving promissory note | Qwest Corporation | CenturyLink, Inc. affiliate    
Long-term debt    
Short-term debt, weighted average interest rate (as a percent) 5.843%  
Note payable - affiliate $ 1,069 $ 1,008