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Accounting Policies (Details) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Capitalized Labor Costs $ 238,000 $ 270,000 $ 246,000
Asset write-down charges $ 21,000 74,000 19,000
Revenue Recognition Non-cancelable Term - Fiber three to 20 years    
Deferred site rental receivables $ 1,588,000 1,408,000  
Revenue, Remaining Performance Obligation, Amount 2,600,000 2,800,000 2,900,000
Contract with Customer, Liability, Revenue Recognized 595,000 575,000  
Employee Severance Payments 20,000    
Interest expense on debt obligations 644,000 683,000 682,000
Amortization of deferred financing costs and adjustments on long-term debt, net 25,000 23,000 21,000
Capitalized interest (12,000) (17,000) (20,000)
Interest expense and amortization of deferred financing costs $ 657,000 689,000 683,000
Percentage of tax position that is likely of being realized upon ultimate settlement 50.00%    
Income (loss) from continuing operations $ 1,096,000 1,056,000 860,000
Dividends, Preferred Stock 0 (57,000) (113,000)
Net Income (Loss) from Continuing Operations Available to Common Shareholders, Basic 1,158,000 999,000 747,000
Net Income (Loss) Available to Common Stockholders, Basic $ 1,096,000 $ 999,000 $ 747,000
Basic (in shares) 432 423 416
Diluted (in shares) 434 425 418
Basic (in dollars per share) $ 2.54 $ 2.36 $ 1.80
Diluted (in dollars per share) 2.53 2.35 1.79
Common Stock, Dividends, Per Share, Declared $ 5.46 $ 4.93 $ 4.58
Portion of company site rental costs that are Towers ground lease expenses 50.00%    
Ground Lease Agreement Initial Term five to 10 years    
Useful life of site rental contracts and customer relationships (years) 20 years    
Revenue Recognition Non-cancelable Lease Term five to 15 years    
Revenue, Performance Obligation, Description of Payment Terms 45 to 60 days    
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 2100.00%    
Minimum [Member]      
Ground Lease Agreement Initial Term five years    
Maximum [Member]      
Ground Lease Agreement Initial Term 10 years    
Preferred Stock [Member]      
Antidilutive securities excluded from computation of earnings per share (in shares)     14
Restricted Stock Units (RSUs) [Member]      
Effect of assumed dilution from potential common shares relating to stock options and restricted stock awards 2 2 2
Sprint Cancellation [Member]      
Asset write-down charges   $ 63,000  
Property, Plant and Equipment [Member]      
Asset write-down charges $ 19,000 77,000 $ 17,000
Other Current Assets [Member]      
Deferred site rental receivables, current 92,000 152,000  
Deferred Revenue [Domain]      
Deferred site rental receivables $ 1,600,000 $ 1,400,000  
Communication Infrastructure [Member]      
Property, Plant and Equipment, Useful Life 20 years    
Communication Infrastructure [Member] | Minimum [Member]      
Property, Plant and Equipment, Useful Life 1 year    
Communication Infrastructure [Member] | Maximum [Member]      
Property, Plant and Equipment, Useful Life 20 years    
Towers [Member]      
Property, Plant and Equipment, Useful Life 20 years