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Long-Term Debt and Credit Facilities (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Long-term Debt and Credit Facilities    
Capital lease and other obligations $ 766 $ 440
Unamortized discounts, net (166) (133)
Unamortized debt issuance costs (206) (193)
Total long-term debt 25,077 19,993
Less current maturities not associated with assets held for sale (196) (1,503)
Less capital lease obligations associated with assets held for sale 0 (305)
Long-term debt, excluding current maturities and capital leases obligations associated with assets held for sale 24,881 18,185
CenturyLink, Inc. | Senior notes    
Long-term Debt and Credit Facilities    
Long-term debt, gross 8,125 8,975
CenturyLink, Inc. | Line of credit    
Long-term Debt and Credit Facilities    
Long-term debt, gross $ 0 $ 370
Interest rate at period end - Credit facility and revolving line of credit (percent) 0.00%  
Long-term debt, weighted average interest rate (percent)   4.50%
CenturyLink, Inc. | Medium-term notes    
Long-term Debt and Credit Facilities    
Long-term debt, gross $ 325 $ 336
Stated interest rate (percent) 2.98%  
CenturyLink, Inc. | Minimum | Senior notes    
Long-term Debt and Credit Facilities    
Stated interest rate (percent) 5.625%  
CenturyLink, Inc. | Maximum | Senior notes    
Long-term Debt and Credit Facilities    
Stated interest rate (percent) 7.65%  
CenturyLink Escrow, LLC | Medium-term notes    
Long-term Debt and Credit Facilities    
Long-term debt, gross $ 6,000 0
Stated interest rate (percent) 1.375%  
Qwest Corporation | Senior notes    
Long-term Debt and Credit Facilities    
Long-term debt, gross $ 7,294 7,259
Qwest Corporation | Medium-term notes    
Long-term Debt and Credit Facilities    
Long-term debt, gross $ 100 100
Stated interest rate (percent) 2.98%  
Qwest Corporation | Minimum | Senior notes    
Long-term Debt and Credit Facilities    
Stated interest rate (percent) 6.125%  
Qwest Corporation | Maximum | Senior notes    
Long-term Debt and Credit Facilities    
Stated interest rate (percent) 7.75%  
Qwest Capital Funding, Inc. | Senior notes    
Long-term Debt and Credit Facilities    
Long-term debt, gross $ 981 981
Qwest Capital Funding, Inc. | Minimum | Senior notes    
Long-term Debt and Credit Facilities    
Stated interest rate (percent) 6.50%  
Qwest Capital Funding, Inc. | Maximum | Senior notes    
Long-term Debt and Credit Facilities    
Stated interest rate (percent) 7.75%  
Embarq Corporation | Senior notes    
Long-term Debt and Credit Facilities    
Long-term debt, gross $ 1,485 1,485
Stated interest rate (percent) 7.995%  
Embarq Corporation | First mortgage bonds    
Long-term Debt and Credit Facilities    
Long-term debt, gross $ 223 223
Embarq Corporation | Other    
Long-term Debt and Credit Facilities    
Long-term debt, gross $ 150 $ 150
Stated interest rate (percent) 9.00%  
Embarq Corporation | Minimum | First mortgage bonds    
Long-term Debt and Credit Facilities    
Stated interest rate (percent) 7.125%  
Embarq Corporation | Maximum | First mortgage bonds    
Long-term Debt and Credit Facilities    
Stated interest rate (percent) 8.77%