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Long-Term Debt and Revolving Promissory Note (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Long-term debt    
Long-term debt, gross $ 7,391  
Capital lease and other obligations 32 $ 17
Unamortized premiums, net 4 16
Unamortized debt issuance costs (134) (123)
Total long-term debt 7,261 7,239
Less current maturities (514) (242)
Long-term debt, excluding current maturities 6,747 6,997
Revolving promissory note    
Note payable - affiliate 914 855
Senior notes | Qwest Corporation    
Long-term debt    
Long-term debt, gross $ 7,259 7,229
Senior notes | Qwest Corporation | Minimum    
Long-term debt    
Interest rate, stated percentage (as a percent) 6.125%  
Senior notes | Qwest Corporation | Maximum    
Long-term debt    
Interest rate, stated percentage (as a percent) 7.75%  
Term loan | Qwest Corporation    
Long-term debt    
Long-term debt, gross $ 100 100
Interest rate, stated percentage (as a percent) 2.52%  
Revolving promissory note | Qwest Corporation | CenturyLink, Inc. affiliate    
Revolving promissory note    
Short-term debt, weighted average interest rate (as a percent) 6.678%  
Note payable - affiliate $ 914 $ 855
Maximum borrowing capacity, note payable-affiliate 1,000  
Accrued interest payable. note payable-affiliate $ 5