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Leases - Schedule of Estimated Useful Life of Right of Use Assets (Details)
 12 Months Ended
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
Sites | Top of range [member]  
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]  
Estimated useful life of right-of-use assets 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 5 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
Poles | Bottom of range [member]  
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]  
Estimated useful life of right-of-use assets 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
Domestic Leased Circuits | Bottom of range [member]  
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]  
Estimated useful life of right-of-use assets 5 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
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
Office buildings [Member] | Top of range [member]  
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]  
Estimated useful life of right-of-use assets 15 years
Co Located Sites  
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]  
Estimated useful life of right-of-use assets 7 years