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Long-Term Debt - Additional Information (Details) - Senior Notes with Varied Maturity Date - Level 3 Financing, Inc. - USD ($)
$ in Millions
Aug. 25, 2019
Jul. 29, 2019
Forecast    
Long-term debt    
Repayments of debt $ 400  
Subsequent Event    
Long-term debt    
Long term debt   $ 640
Stated interest rate   6.125%