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Long-Term Debt and Revolving Promissory Note - Schedule of Long-Term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Long-term debt    
Long-term debt, gross $ 6,077  
Capital lease and other obligations 21 $ 36
Unamortized (discounts) premiums, net (1) 1
Unamortized debt issuance costs (117) (150)
Total long-term debt 5,959 7,281
Less current maturities (11) (17)
Long-term debt, excluding current maturities 5,948 7,264
Revolving promissory note    
Note payable - affiliate 1,008 965
Qwest Corporation | Senior notes    
Long-term debt    
Long-term debt, gross $ 5,956 7,294
Qwest Corporation | Senior notes | Minimum    
Long-term debt    
Interest rate, stated percentage (as a percent) 6.125%  
Qwest Corporation | Senior notes | Maximum    
Long-term debt    
Interest rate, stated percentage (as a percent) 7.75%  
Qwest Corporation | Term loan    
Long-term debt    
Long-term debt, gross $ 100 100
Interest rate, stated percentage (as a percent) 4.53%  
Qwest Corporation | Revolving promissory note | CenturyLink, Inc. affiliate    
Revolving promissory note    
Short-term debt, weighted average interest rate (as a percent) 5.86%  
Note payable - affiliate $ 1,008 $ 965