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Leases - Schedule of Estimated Useful Life of Right of Use Assets (Details)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Sites | Bottom of range [member]    
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]    
Estimated useful life of right-of-use assets 1 year 1 year
Sites | Top of range [member]    
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]    
Estimated useful life of right-of-use assets 30 years 30 years
International Leased Circuits | Bottom of range [member]    
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]    
Estimated useful life of right-of-use assets 3 years 3 years
International Leased Circuits | Top of range [member]    
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]    
Estimated useful life of right-of-use assets 7 years 7 years
Poles | Bottom of range [member]    
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]    
Estimated useful life of right-of-use assets 1 year 1 year
Poles | Top of range [member]    
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]    
Estimated useful life of right-of-use assets 10 years 10 years
Domestic Leased Circuits | Bottom of range [member]    
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]    
Estimated useful life of right-of-use assets 4 years 4 years
Domestic Leased Circuits | Top of range [member]    
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]    
Estimated useful life of right-of-use assets 10 years 10 years
Office buildings [Member] | Bottom of range [member]    
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]    
Estimated useful life of right-of-use assets 1 year 1 year
Office buildings [Member] | Top of range [member]    
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]    
Estimated useful life of right-of-use assets 25 years 25 years
Co Located Sites | Bottom of range [member]    
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]    
Estimated useful life of right-of-use assets 1 year 1 year
Co Located Sites | Top of range [member]    
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]    
Estimated useful life of right-of-use assets 5 years 5 years