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Long-Term Debt and Revolving Promissory Note (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Long-term debt    
Less current maturities $ (17) $ (17)
Long-term debt, excluding current maturities 7,260 7,264
Note payable - affiliate 981 965
Qwest Corporation    
Long-term debt    
Capital lease and other obligations 32 36
Unamortized premiums, net 1 1
Unamortized debt issuance costs (150) (150)
Total long-term debt 7,277 7,281
Less current maturities (17) (17)
Long-term debt, excluding current maturities 7,260 7,264
Qwest Corporation | Senior notes    
Long-term debt    
Long-term debt, gross $ 7,294 7,294
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) 3.89%  
Qwest Corporation | Loans payable | Affiliated entity    
Long-term debt    
Weighted average interest rate (percent) 5.466%  
Note payable - affiliate $ 981 $ 965