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Long-Term Debt and Credit Facilities (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Long-term Debt and Credit Facilities    
Capital lease and other obligations $ 441 $ 425
Unamortized discounts, net (130) (125)
Unamortized debt issuance costs (194) (179)
Total long-term debt 19,616 20,225
Less current maturities (1,451) (1,503)
Long-term debt, excluding current maturities 18,165 18,722
CenturyLink, Inc. | Senior notes    
Long-term Debt and Credit Facilities    
Long-term debt, gross 8,975 7,975
CenturyLink, Inc. | Line of credit    
Long-term Debt and Credit Facilities    
Long-term debt, gross $ 0 $ 410
Interest rate at period end - Credit facility and revolving line of credit (percent) 0.00%  
Long-term debt, weighted average interest rate (percent)   2.756%
CenturyLink, Inc. | Medium-term notes    
Long-term Debt and Credit Facilities    
Long-term debt, gross $ 347 $ 358
Interest rate at period end - Term loan (percent) 2.22%  
CenturyLink, Inc. | Minimum | Senior notes    
Long-term Debt and Credit Facilities    
Stated interest rate (percent) 5.15%  
CenturyLink, Inc. | Maximum | Senior notes    
Long-term Debt and Credit Facilities    
Stated interest rate (percent) 7.65%  
Qwest Corporation | Senior notes    
Long-term Debt and Credit Facilities    
Long-term debt, gross $ 7,229 7,229
Qwest Corporation | Medium-term notes    
Long-term Debt and Credit Facilities    
Long-term debt, gross $ 100 100
Interest rate at period end - Term loan (percent) 2.22%  
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 and subsidiaries | Senior notes    
Long-term Debt and Credit Facilities    
Long-term debt, gross $ 1,485 2,669
Embarq Corporation and subsidiaries | First mortgage bonds    
Long-term Debt and Credit Facilities    
Long-term debt, gross 232 232
Embarq Corporation and subsidiaries | Other    
Long-term Debt and Credit Facilities    
Long-term debt, gross $ 150 $ 150
Stated interest rate (percent) 9.00%  
Embarq Corporation and subsidiaries | Minimum | First mortgage bonds    
Long-term Debt and Credit Facilities    
Stated interest rate (percent) 7.125%  
Embarq Corporation and subsidiaries | Maximum | First mortgage bonds    
Long-term Debt and Credit Facilities    
Stated interest rate (percent) 8.77%  
7.995% Notes Due 2036 | Embarq Corporation and subsidiaries | Senior notes    
Long-term Debt and Credit Facilities    
Stated interest rate (percent) 7.995%