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Long-Term Debt and Revolving Promissory Note - Schedule of Long Term Debt (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Long-term debt    
Less current maturities $ (9) $ (11)
Long-term debt, excluding current maturities 5,947 5,948
Note payable - affiliate 1,038 1,008
Qwest Corporation    
Long-term debt    
Finance lease and other obligations 17 21
Unamortized (discounts) premiums, net (1) (1)
Unamortized debt issuance costs (116) (117)
Total long-term debt 5,956 5,959
Less current maturities (9) (11)
Long-term debt, excluding current maturities 5,947 5,948
Qwest Corporation | Senior notes    
Long-term debt    
Long-term debt, gross $ 5,956 5,956
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 4.50%  
Long-term debt, gross $ 100 100
Qwest Corporation | Loans payable | Affiliated entity    
Long-term debt    
Weighted average interest rate 5.945%  
Note payable - affiliate $ 1,038 $ 1,008