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Long-Term Debt and Revolving Promissory Note (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Long-term debt    
Less current maturities $ (17) $ (514)
Long-term debt, excluding current maturities 7,266 6,747
Note payable - affiliate 944 914
Qwest Corporation    
Long-term debt    
Capital lease and other obligations 40 32
Unamortized premiums, net 0 4
Unamortized debt issuance costs (151) (134)
Total long-term debt 7,283 7,261
Less current maturities (17) (514)
Long-term debt, excluding current maturities 7,266 6,747
Qwest Corporation | Senior notes    
Long-term debt    
Long-term debt, gross $ 7,294 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) 2.98%  
Qwest Corporation | Loans payable | Affiliated entity    
Long-term debt    
Weighted average interest rate (percent) 6.71%  
Note payable - affiliate $ 944 $ 914