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Long-Term Debt and Revolving Promissory Note - Schedule of Long Term Debt (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Long-term debt    
Less current maturities $ (13) $ (17)
Long-term debt, excluding current maturities 5,950 7,264
Note payable - affiliate 1,008 965
Qwest Corporation    
Long-term debt    
Capital lease and other obligations 25 36
Unamortized (discounts) premiums, net (1) 1
Unamortized debt issuance costs (116) (150)
Total long-term debt 5,963 7,281
Less current maturities (13) (17)
Long-term debt, excluding current maturities 5,950 7,264
Qwest Corporation | Senior notes    
Long-term debt    
Long-term debt, gross $ 5,955 7,294
Qwest Corporation | Senior notes | Minimum    
Long-term debt    
Stated interest rate 6.125%  
Qwest Corporation | Senior notes | Maximum    
Long-term debt    
Stated interest rate 7.75%  
Qwest Corporation | Term loan    
Long-term debt    
Stated interest rate 4.25%  
Long-term debt, gross $ 100 100
Qwest Corporation | Loans payable | Affiliated entity    
Long-term debt    
Weighted average interest rate 5.86%  
Note payable - affiliate $ 1,008 $ 965