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Long-Term Debt and Revolving Promissory Note (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Long-term debt    
Capital lease and other obligations $ 18 $ 32
Total long-term debt 7,362 7,379
Less current maturities (248) (117)
Long-term debt, excluding current maturities 7,114 7,262
Senior notes    
Long-term debt    
Long-term debt, gross 7,219 7,311
Unamortized premiums, net $ 25 36
Senior notes | Minimum    
Long-term debt    
Interest rate (as a percent) 6.125%  
Senior notes | Maximum    
Long-term debt    
Interest rate (as a percent) 8.375%  
Medium-term loan    
Long-term debt    
Long-term debt, gross $ 100 0
Qwest Corporation | Medium-term loan    
Long-term debt    
Interest rate at end of period - Term loan (percent) 1.94%  
Qwest Corporation | Revolving promissory note | CenturyLink, Inc. affiliate    
Long-term debt    
Note payable - affiliate $ 827 $ 796
Weighted average interest rate (as a percent) 6.658%