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Long-Term Debt and Revolving Promissory Note (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Long-term debt    
Capital lease and other obligations $ 14 $ 32
Total long-term debt 7,764 7,379
Less current maturities (644) (117)
Long-term debt, excluding current maturities 7,120 7,262
Senior notes    
Long-term debt    
Long-term debt, gross 7,629 7,311
Unamortized premiums, net $ 21 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
Interest rate at end of period - Term loan (percent) 1.95%  
Note payable - affiliate | Loans payable | CenturyLink, Inc. affiliate    
Long-term debt    
Note payable - affiliate $ 827 $ 796
Weighted average interest rate (as a percent) 6.658%