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Long-Term Debt and Revolving Promissory Note (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Long-term debt    
Less current maturities $ (515) $ (514)
Long-term debt, excluding current maturities 6,746 6,747
Note payable - affiliate 914 914
Qwest Corporation    
Long-term debt    
Capital lease and other obligations 34 32
Unamortized premiums, net 2 4
Unamortized debt issuance costs (134) (134)
Total long-term debt 7,261 7,261
Less current maturities (515) (514)
Long-term debt, excluding current maturities 6,746 6,747
Qwest Corporation | Senior notes    
Long-term debt    
Long-term debt, gross $ 7,259 7,259
Qwest Corporation | Senior notes | Minimum    
Long-term debt    
Stated interest rate (percent) 6.125%  
Qwest Corporation | Senior notes | Maximum    
Long-term debt    
Stated interest rate (percent) 7.75%  
Qwest Corporation | Term loan    
Long-term debt    
Long-term debt, gross $ 100 100
Stated interest rate (percent) 2.74%  
Qwest Corporation | Loans payable | Affiliated entity    
Long-term debt    
Weighted average interest rate (percent) 6.678%  
Note payable - affiliate $ 914 $ 914