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Long-Term Debt and Credit Facilities - Schedule of Long Term Debt (Details) - USD ($)
6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Long-term Debt and Credit Facilities    
Capital lease and other obligations $ 844,000,000 $ 891,000,000
Unamortized premiums and other, net 11,000,000 23,000,000
Unamortized debt issuance costs (334,000,000) (350,000,000)
Total long-term debt 37,315,000,000 37,726,000,000
Less current maturities (437,000,000) (443,000,000)
Long-term debt, excluding current maturities 36,878,000,000 $ 37,283,000,000
CenturyLink, Inc. | Line of credit    
Long-term Debt and Credit Facilities    
Long-term debt, weighted average interest rate   4.186%
CenturyLink, Inc. | Senior notes    
Long-term Debt and Credit Facilities    
Long-term debt, gross $ 8,125,000,000 $ 8,125,000,000
CenturyLink, Inc. | Minimum | Senior notes    
Long-term Debt and Credit Facilities    
Stated interest rate 5.625%  
CenturyLink, Inc. | Maximum | Senior notes    
Long-term Debt and Credit Facilities    
Stated interest rate 7.65%  
Level 3 Financing, Inc. | Medium-term notes    
Long-term Debt and Credit Facilities    
Basis spread on variable rate 2.25%  
Stated interest rate 4.3341% 3.557%
Long-term debt, gross $ 4,611,000,000 $ 4,611,000,000
Level 3 Financing, Inc. | Senior notes    
Long-term Debt and Credit Facilities    
Long-term debt, gross $ 5,315,000,000 5,315,000,000
Level 3 Financing, Inc. | Minimum | Medium-term notes    
Long-term Debt and Credit Facilities    
Basis spread on variable rate 0.00%  
Level 3 Financing, Inc. | Minimum | Senior notes    
Long-term Debt and Credit Facilities    
Stated interest rate 5.125%  
Level 3 Financing, Inc. | Maximum | Senior notes    
Long-term Debt and Credit Facilities    
Stated interest rate 6.125%  
Level 3 Parent, LLC | Senior notes    
Long-term Debt and Credit Facilities    
Stated interest rate 5.75%  
Long-term debt, gross $ 600,000,000 600,000,000
Qwest Corporation | Medium-term notes    
Long-term Debt and Credit Facilities    
Stated interest rate 4.10%  
Long-term debt, gross $ 100,000,000 100,000,000
Qwest Corporation | Senior notes    
Long-term Debt and Credit Facilities    
Long-term debt, gross $ 7,294,000,000 7,294,000,000
Qwest Corporation | Minimum | Senior notes    
Long-term Debt and Credit Facilities    
Stated interest rate 6.125%  
Qwest Corporation | Maximum | Senior notes    
Long-term Debt and Credit Facilities    
Stated interest rate 7.75%  
Qwest Capital Funding, Inc. | Senior notes    
Long-term Debt and Credit Facilities    
Long-term debt, gross $ 981,000,000 981,000,000
Qwest Capital Funding, Inc. | Minimum | Senior notes    
Long-term Debt and Credit Facilities    
Stated interest rate 6.50%  
Qwest Capital Funding, Inc. | Maximum | Senior notes    
Long-term Debt and Credit Facilities    
Stated interest rate 7.75%  
Embarq Corporation | First mortgage bonds    
Long-term Debt and Credit Facilities    
Long-term debt, gross $ 138,000,000 151,000,000
Embarq Corporation | Senior notes    
Long-term Debt and Credit Facilities    
Stated interest rate 7.995%  
Long-term debt, gross $ 1,485,000,000 1,485,000,000
Embarq Corporation | Other    
Long-term Debt and Credit Facilities    
Stated interest rate 9.00%  
Long-term debt, gross $ 150,000,000 150,000,000
Embarq Corporation | Minimum | First mortgage bonds    
Long-term Debt and Credit Facilities    
Stated interest rate 7.125%  
Embarq Corporation | Maximum | First mortgage bonds    
Long-term Debt and Credit Facilities    
Stated interest rate 8.375%  
New Revolving Credit Facility | CenturyLink, Inc. | Line of credit    
Long-term Debt and Credit Facilities    
Stated interest rate 4.844%  
Long-term debt, gross $ 0 405,000,000
Term Loan A | CenturyLink, Inc. | Medium-term notes    
Long-term Debt and Credit Facilities    
Stated interest rate 4.844%  
Long-term debt, gross $ 1,664,000,000 1,575,000,000
Term Loan A-1 | CenturyLink, Inc. | Medium-term notes    
Long-term Debt and Credit Facilities    
Stated interest rate 4.844%  
Long-term debt, gross $ 361,000,000 370,000,000
Term Loan B | CenturyLink, Inc. | Medium-term notes    
Long-term Debt and Credit Facilities    
Stated interest rate 4.844%  
Long-term debt, gross $ 5,970,000,000 $ 6,000,000,000