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Long-Term Debt and Revolving Promissory Note Long-Term Debt and Revolving Promissory Note (Details 2) - USD ($)
$ in Millions
6 Months Ended
Jun. 15, 2015
Feb. 20, 2015
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Long-term debt          
Repayments of long-term debt     $ 106 $ 24  
Senior notes          
Long-term debt          
Long-term debt, gross     7,219   $ 7,311
Senior notes | 7.625% Notes due 2015          
Long-term debt          
Repayments of long-term debt $ 92        
Interest rate (as a percent) 7.625%        
Medium-term loan          
Long-term debt          
Long-term debt, gross     100   0
Qwest Corporation | Medium-term loan | Term loan          
Long-term debt          
Debt instrument face amount   $ 100      
Long-term debt, gross     $ 100    
Minimum | Senior notes          
Long-term debt          
Interest rate (as a percent)     6.125%    
Minimum | Qwest Corporation | Medium-term loan | Term loan | London Interbank Offered Rate (LIBOR)          
Long-term debt          
Basis spread on variable rate (as a percent)   1.50%      
Minimum | Qwest Corporation | Medium-term loan | Term loan | Base Rate          
Long-term debt          
Basis spread on variable rate (as a percent)   0.50%      
Maximum | Senior notes          
Long-term debt          
Interest rate (as a percent)     8.375%    
Maximum | Qwest Corporation | Medium-term loan | Term loan | London Interbank Offered Rate (LIBOR)          
Long-term debt          
Basis spread on variable rate (as a percent)   2.50%      
Maximum | Qwest Corporation | Medium-term loan | Term loan | Base Rate          
Long-term debt          
Basis spread on variable rate (as a percent)   1.50%      
CenturyLink, Inc. affiliate | Qwest Corporation | Revolving promissory note          
Long-term debt          
Maximum borrowing capacity     $ 1,000    
Note payable - affiliate     $ 827   $ 796
Weighted average interest rate (as a percent)     6.658%    
Accrued interest payable on related party note payable     $ 5