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Commitments and Contingencies and Other Items (Details)
plaintiff in Thousands, $ in Thousands
1 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
lawsuit
Feb. 28, 2017
USD ($)
lawsuit
Jun. 30, 2021
USD ($)
contract
plaintiff
Employee
Dec. 31, 2005
USD ($)
subsidiary
Loss Contingencies        
Estimate of possible loss $ 115,000   $ 115,000  
Patents allegedly infringed | lawsuit   1    
Number of members (more than) | plaintiff     12  
Unfavorable Regulatory Action        
Loss Contingencies        
Estimate of possible loss $ 300   $ 300  
Level 3 Parent, LLC        
Loss Contingencies        
Damages sought, value     $ 50,000  
U.S. District Court for the District of Minnesota        
Loss Contingencies        
Number of members (more than) | plaintiff     11  
Missouri Municipalities | Judicial ruling        
Loss Contingencies        
Patents allegedly infringed | lawsuit   1    
Litigation settlement amount   $ 4,000    
Columbia and Joplin Municipalities | Judicial ruling        
Loss Contingencies        
Patents allegedly infringed | lawsuit 1      
Litigation settlement amount $ 55,000      
Peruvian Tax Litigation | Pending litigation        
Loss Contingencies        
Number of subsidiaries issues with tax assessment | subsidiary       1
Loss contingency, asserted claim       $ 26,000
Brazilian Tax Claims | Pending litigation | Maximum        
Loss Contingencies        
Loss contingency, range of possible loss, portion not accrued $ 53,000   $ 53,000  
United States of America ex rel., Stephen Bishop v. Level 3 Communications, Inc. et al.        
Loss Contingencies        
Number of former employees names in lawsuit | Employee     2  
Number of government contracts in question | contract     2