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Long-Term Debt and Revolving Promissory Note (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Apr. 18, 2012
Long-term debt      
Long-term debt, gross $ 7,430    
Capital lease and other obligations 36 $ 32  
Unamortized premiums, net 1 4  
Unamortized debt issuance costs (150) (134)  
Total long-term debt 7,281 7,261  
Less current maturities (17) (514)  
Long-term debt, excluding current maturities 7,264 6,747  
Revolving promissory note      
Note payable - affiliate 965 914  
Qwest Corporation | Senior notes      
Long-term debt      
Long-term debt, gross $ 7,294 7,259  
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) 3.57%    
Qwest Corporation | Revolving promissory note | CenturyLink, Inc. affiliate      
Revolving promissory note      
Short-term debt, weighted average interest rate (as a percent) 6.71%    
Note payable - affiliate $ 965 $ 914  
Maximum borrowing capacity, note payable-affiliate     $ 1,000
Accrued interest payable. note payable-affiliate $ 16