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Commitments and Contingencies and Other Items - Additional Information (Details)
plaintiff in Thousands
1 Months Ended 12 Months Ended
Feb. 28, 2017
USD ($)
patent
lawsuit
Dec. 31, 2020
USD ($)
Employee
plaintiff
contract
Dec. 31, 2019
USD ($)
Dec. 31, 2005
USD ($)
subsidiary
Commitments and Contingencies        
Reasonable expectation of loss, maximum per proceeding   $ 141,000,000 $ 180,000,000  
Number of patents allegedly infringed, minimum | patent 1      
Number of class members elected to opt out | plaintiff   12    
Purchase obligations maturities        
Total purchase commitments   $ 1,000,000,000.0    
2021   403,000,000    
2022 and 2023   328,000,000    
2024 and 2025   98,000,000    
2026 and thereafter   171,000,000    
Unfavorable regulatory action        
Commitments and Contingencies        
Reasonable expectation of loss, maximum per proceeding   300,000    
Level 3 Parent, LLC        
Commitments and Contingencies        
Loss contingency, damages sought, value   $ 50,000,000    
U.S. District Court for the District of Minnesota        
Commitments and Contingencies        
Number of class members | plaintiff   11    
Missouri Municipalities | Judicial ruling        
Commitments and Contingencies        
Number of patents allegedly infringed, minimum | lawsuit 1      
Litigation settlement, amount awarded to other party $ 4,000,000      
Minnesota Consumer Class Actions | U.S. District Court for the District of Minnesota        
Commitments and Contingencies        
Litigation settlement, amount awarded to other party   $ 15,500,000    
Minnesota Securities Investor Class Actions | U.S. District Court for the District of Minnesota        
Commitments and Contingencies        
Litigation settlement, amount awarded to other party   55,000,000    
Peruvian Tax Litigation | Pending litigation        
Commitments and Contingencies        
Reasonable expectation of loss, maximum per proceeding   2,000,000    
Number of subsidiaries issues with tax assessment | subsidiary       1
Loss contingency, asserted claim       $ 26,000,000
Brazilian Tax Claims | Pending litigation        
Commitments and Contingencies        
Loss contingency, range of possible loss, portion not accrued   17,000,000    
Brazilian Tax Claims | Pending litigation | Maximum        
Commitments and Contingencies        
Loss contingency, range of possible loss, portion not accrued   $ 49,000,000    
United States of America ex rel., Stephen Bishop v. Level 3 Communications, Inc. et al. [Member]        
Commitments and Contingencies        
Number of former employees names in lawsuit | Employee   2    
Number of government contracts in question | contract   2    
Number of former employees with plea agreements | Employee   1