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Commitments and Contingencies - Part 2 (Details)
1 Months Ended 3 Months Ended
Sep. 23, 2016
USD ($)
Aug. 18, 2015
USD ($)
Mar. 14, 2014
USD ($)
Feb. 28, 2022
USD ($)
Jan. 31, 2022
USD ($)
Mar. 31, 2022
USD ($)
Sep. 30, 2021
USD ($)
Oct. 02, 2016
patent
Loss contingencies                
Network development current and future expenditures           $ 10,000,000,000    
Loss contingency terms                
Number Of Patents | patent               4
Ghz 3.45 to 3.55                
Loss contingencies                
Aggregate bids totaled       $ 7,205,000,000 $ 7,205,000,000      
Payment to Federal Communication Commission as Deposit for Auction             $ 123,000,000  
Northstar Spectrum And SNR Holdco | AWS-3 Licenses                
Loss contingencies                
Interim Build-out Requirement (as a percent)           40.00%    
Final Build-out Requirement (as a percent)           75.00%    
Accelerated period to meet Final Build-Out Requirement on failure to meet Interim Build-Out Requirement           2 years    
Loss contingency terms                
Percentage Of Bidding Credit           25.00%    
Northstar Wireless or Northstar Spectrum | AWS-3 Licenses                
Loss contingency terms                
Percentage Of Bidding Credit           25.00%    
Northstar Wireless or Northstar Spectrum | AWS-3 Licenses | Vermont National Telephone Company                
Loss contingency terms                
Percentage Of Bidding Credit 25.00%              
Recovery amount $ 10,000,000,000              
Bidding Credit 3,300,000,000              
Northstar Wireless or Northstar Spectrum | AWS-3 Licenses | Minimum | Vermont National Telephone Company                
Loss contingency terms                
Claim amount 5,500              
Northstar Wireless or Northstar Spectrum | AWS-3 Licenses | Maximum | Vermont National Telephone Company                
Loss contingency terms                
Claim amount $ 11,000              
Northstar Wireless or Northstar Spectrum | SNR Licenses                
Loss contingency terms                
Percentage Of Bidding Credit   25.00%            
Northstar Wireless or Northstar Spectrum | Northstar Licenses                
Loss contingency terms                
Bidding Credit   $ 1,961,000,000            
SNR Wireless or SNR Wireless Holdco | SNR Licenses                
Loss contingency terms                
Percentage Of Bidding Credit           25.00%    
Bidding Credit   $ 1,370,000,000            
Pending Litigation [Member] | ClearPlay                
Loss contingency terms                
Claim amount     $ 543,000,000