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Long-Term Debt and Credit Facilities - Schedule of Long Term Debt (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Long-term Debt and Credit Facilities    
Capital lease and other obligations $ 825 $ 891
Unamortized premiums and other, net 2 23
Unamortized debt issuance costs (292) (350)
Total long-term debt 36,527 37,726
Less current maturities (778) (443)
Long-term debt, excluding current maturities 35,749 $ 37,283
CenturyLink, Inc. | Line of credit    
Long-term Debt and Credit Facilities    
Long-term debt, weighted average interest rate   4.186%
CenturyLink, Inc. | Line of credit | New Revolving Credit Facility    
Long-term Debt and Credit Facilities    
Long-term debt, gross $ 590 $ 405
CenturyLink, Inc. | Line of credit | New Revolving Credit Facility | Minimum    
Long-term Debt and Credit Facilities    
Stated interest rate 4.898%  
CenturyLink, Inc. | Line of credit | New Revolving Credit Facility | Maximum    
Long-term Debt and Credit Facilities    
Stated interest rate 4.908%  
CenturyLink, Inc. | Medium-term notes | Term Loan A    
Long-term Debt and Credit Facilities    
Stated interest rate 4.99219%  
Long-term debt, gross $ 1,643 1,575
CenturyLink, Inc. | Medium-term notes | Term Loan A-1    
Long-term Debt and Credit Facilities    
Stated interest rate 4.99219%  
Long-term debt, gross $ 356 370
CenturyLink, Inc. | Medium-term notes | Term Loan B    
Long-term Debt and Credit Facilities    
Stated interest rate 4.99219%  
Long-term debt, gross $ 5,955 6,000
CenturyLink, Inc. | Senior notes    
Long-term Debt and Credit Facilities    
Long-term debt, gross $ 8,115 $ 8,125
CenturyLink, Inc. | Senior notes | Minimum    
Long-term Debt and Credit Facilities    
Stated interest rate 5.625%  
CenturyLink, Inc. | Senior notes | Maximum    
Long-term Debt and Credit Facilities    
Stated interest rate 7.65%  
Level 3 Financing, Inc. | Medium-term notes    
Long-term Debt and Credit Facilities    
Stated interest rate 4.432% 3.557%
Long-term debt, gross $ 4,611 $ 4,611
Level 3 Financing, Inc. | Medium-term notes | Minimum    
Long-term Debt and Credit Facilities    
Basis spread on variable rate 0.00%  
Level 3 Financing, Inc. | Senior notes    
Long-term Debt and Credit Facilities    
Long-term debt, gross $ 5,315 5,315
Level 3 Financing, Inc. | Senior notes | Minimum    
Long-term Debt and Credit Facilities    
Stated interest rate 5.125%  
Level 3 Financing, Inc. | Senior notes | Maximum    
Long-term Debt and Credit Facilities    
Stated interest rate 6.125%  
Embarq Corporation | First mortgage bonds    
Long-term Debt and Credit Facilities    
Long-term debt, gross $ 138 151
Embarq Corporation | First mortgage bonds | Minimum    
Long-term Debt and Credit Facilities    
Stated interest rate 7.125%  
Embarq Corporation | First mortgage bonds | Maximum    
Long-term Debt and Credit Facilities    
Stated interest rate 8.37%  
Embarq Corporation | Senior notes    
Long-term Debt and Credit Facilities    
Stated interest rate 7.995%  
Long-term debt, gross $ 1,485 1,485
Embarq Corporation | Other    
Long-term Debt and Credit Facilities    
Stated interest rate 9.00%  
Long-term debt, gross $ 150 150
Level 3 Parent, LLC | Senior notes    
Long-term Debt and Credit Facilities    
Long-term debt, gross $ 600 600
Level 3 Parent, LLC | Senior notes | Minimum    
Long-term Debt and Credit Facilities    
Stated interest rate 5.125%  
Level 3 Parent, LLC | Senior notes | Maximum    
Long-term Debt and Credit Facilities    
Stated interest rate 6.125%  
Qwest Corporation | Medium-term notes    
Long-term Debt and Credit Facilities    
Stated interest rate 4.25%  
Long-term debt, gross $ 100 100
Qwest Corporation | Senior notes    
Long-term Debt and Credit Facilities    
Long-term debt, gross $ 5,955 7,294
Qwest Corporation | Senior notes | Minimum    
Long-term Debt and Credit Facilities    
Stated interest rate 6.125%  
Qwest Corporation | Senior notes | Maximum    
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 $ 979 $ 981
Qwest Capital Funding, Inc. | Senior notes | Minimum    
Long-term Debt and Credit Facilities    
Stated interest rate 6.50%  
Qwest Capital Funding, Inc. | Senior notes | Maximum    
Long-term Debt and Credit Facilities    
Stated interest rate 7.75%