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Long-Term Debt and Credit Facilities - Schedule of Long Term Debt (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Long-term Debt and Credit Facilities    
Capital lease and other obligations $ 868 $ 891
Unamortized premiums and other, net 17 23
Unamortized debt issuance costs (343) (350)
Total long-term debt 37,377 37,726
Less current maturities (437) (443)
Long-term debt, excluding current maturities 36,940 $ 37,283
CenturyLink, Inc. | Line of credit    
Long-term Debt and Credit Facilities    
Long-term debt, weighted average interest rate (percent)   4.186%
CenturyLink, Inc. | Senior notes    
Long-term Debt and Credit Facilities    
Long-term debt, gross $ 8,125 $ 8,125
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%  
Level 3 Financing, Inc. | Medium-term notes    
Long-term Debt and Credit Facilities    
Long-term debt, gross $ 4,611 4,611
Stated interest rate (percent) 4.111%  
Level 3 Financing, Inc. | Senior notes    
Long-term Debt and Credit Facilities    
Long-term debt, gross $ 5,315 5,315
Level 3 Financing, Inc. | Minimum | Senior notes    
Long-term Debt and Credit Facilities    
Stated interest rate (percent) 5.125%  
Level 3 Financing, Inc. | Maximum | Senior notes    
Long-term Debt and Credit Facilities    
Stated interest rate (percent) 6.125%  
Level 3 Parent, LLC | Senior notes    
Long-term Debt and Credit Facilities    
Long-term debt, gross $ 600 600
Stated interest rate (percent) 5.75%  
Qwest Corporation | Medium-term notes    
Long-term Debt and Credit Facilities    
Long-term debt, gross $ 100 100
Stated interest rate (percent) 3.89%  
Qwest Corporation | Senior notes    
Long-term Debt and Credit Facilities    
Long-term debt, gross $ 7,294 7,294
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 | First mortgage bonds    
Long-term Debt and Credit Facilities    
Long-term debt, gross $ 138 151
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 | 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) 8.375%  
New Revolving Credit Facility | CenturyLink, Inc. | Line of credit    
Long-term Debt and Credit Facilities    
Long-term debt, gross $ 0 405
Term Loan A | CenturyLink, Inc. | Medium-term notes    
Long-term Debt and Credit Facilities    
Long-term debt, gross $ 1,686 1,575
Stated interest rate (percent) 4.627%  
Term Loan A-1 | CenturyLink, Inc. | Medium-term notes    
Long-term Debt and Credit Facilities    
Long-term debt, gross $ 365 370
Stated interest rate (percent) 4.627%  
Term Loan B | CenturyLink, Inc. | Medium-term notes    
Long-term Debt and Credit Facilities    
Long-term debt, gross $ 5,985 $ 6,000
Stated interest rate (percent) 4.627%