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Long-Term Debt and Credit Facilities - Schedule of Long Term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Long-term Debt and Credit Facilities    
Long-term debt, gross $ 35,854  
Capital lease and other obligations 801 $ 891
Unamortized (discounts) premiums and other, net (8) 23
Unamortized debt issuance costs (283) (350)
Total long-term debt 36,061 37,726
Less current maturities (652) (443)
Long-term debt, excluding current maturities 35,409 37,283
Credit facility | CenturyLink, Inc. | 2017 Revolving Credit Facility    
Long-term Debt and Credit Facilities    
Long-term debt, gross $ 550 405
Weighted average interest rate 5.322%  
Credit facility | CenturyLink, Inc. | 2017 Revolving Credit Facility | Minimum    
Long-term Debt and Credit Facilities    
Interest rate, stated percentage 5.13%  
Credit facility | CenturyLink, Inc. | 2017 Revolving Credit Facility | Maximum    
Long-term Debt and Credit Facilities    
Interest rate, stated percentage 7.25%  
Medium-term Notes | CenturyLink, Inc. | Term Loan A    
Long-term Debt and Credit Facilities    
Interest rate, stated percentage 5.272%  
Long-term debt, gross $ 1,622 1,575
Medium-term Notes | CenturyLink, Inc. | Term Loan A-1    
Long-term Debt and Credit Facilities    
Interest rate, stated percentage 5.272%  
Long-term debt, gross $ 351 370
Medium-term Notes | CenturyLink, Inc. | Term Loan B    
Long-term Debt and Credit Facilities    
Interest rate, stated percentage 5.272%  
Long-term debt, gross $ 5,940 $ 6,000
Medium-term Notes | Level 3 Financing, Inc.    
Long-term Debt and Credit Facilities    
Interest rate, stated percentage 4.754% 3.557%
Long-term debt, gross $ 4,611 $ 4,611
Medium-term Notes | Qwest Corporation    
Long-term Debt and Credit Facilities    
Interest rate, stated percentage 4.53%  
Long-term debt, gross $ 100 100
First mortgage bonds | Embarq Corporation    
Long-term Debt and Credit Facilities    
Long-term debt, gross $ 138 151
First mortgage bonds | Embarq Corporation | Minimum    
Long-term Debt and Credit Facilities    
Interest rate, stated percentage 7.125%  
First mortgage bonds | Embarq Corporation | Maximum    
Long-term Debt and Credit Facilities    
Interest rate, stated percentage 8.375%  
Senior Notes | CenturyLink, Inc.    
Long-term Debt and Credit Facilities    
Long-term debt, gross $ 8,036 8,125
Senior Notes | CenturyLink, Inc. | Minimum    
Long-term Debt and Credit Facilities    
Interest rate, stated percentage 5.625%  
Senior Notes | CenturyLink, Inc. | Maximum    
Long-term Debt and Credit Facilities    
Interest rate, stated percentage 7.65%  
Senior Notes | Level 3 Financing, Inc.    
Long-term Debt and Credit Facilities    
Long-term debt, gross $ 5,315 5,315
Senior Notes | Level 3 Financing, Inc. | Minimum    
Long-term Debt and Credit Facilities    
Interest rate, stated percentage 5.125%  
Senior Notes | Level 3 Financing, Inc. | Maximum    
Long-term Debt and Credit Facilities    
Interest rate, stated percentage 6.125%  
Senior Notes | Embarq Corporation    
Long-term Debt and Credit Facilities    
Interest rate, stated percentage 7.995%  
Long-term debt, gross $ 1,485 1,485
Senior Notes | Level 3 Parent, LLC    
Long-term Debt and Credit Facilities    
Interest rate, stated percentage 5.75%  
Long-term debt, gross $ 600 600
Senior Notes | Qwest Corporation    
Long-term Debt and Credit Facilities    
Long-term debt, gross $ 5,956 7,294
Senior Notes | Qwest Corporation | Minimum    
Long-term Debt and Credit Facilities    
Interest rate, stated percentage 6.125%  
Senior Notes | Qwest Corporation | Maximum    
Long-term Debt and Credit Facilities    
Interest rate, stated percentage 7.75%  
Senior Notes | Qwest Capital Funding, Inc    
Long-term Debt and Credit Facilities    
Long-term debt, gross $ 697 981
Senior Notes | Qwest Capital Funding, Inc | Minimum    
Long-term Debt and Credit Facilities    
Interest rate, stated percentage 6.875%  
Senior Notes | Qwest Capital Funding, Inc | Maximum    
Long-term Debt and Credit Facilities    
Interest rate, stated percentage 7.75%  
Other | Embarq Corporation    
Long-term Debt and Credit Facilities    
Interest rate, stated percentage 9.00%  
Long-term debt, gross $ 150 $ 150