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Document and Entity Information Document - $ / shares
 6 Months Ended
Jun. 30, 2021
Jul. 29, 2021
Dec. 31, 2020
Jul. 31, 2020
Document Information [Line Items]        
Document Quarterly Report true      
Document Transition Report false      
Title of 12(b) Security Common Stock, par value $0.01 per share      
Entity Tax Identification Number 47-4116383      
Entity Incorporation, State or Country Code DE      
Trading Symbol ADT      
Entity Registrant Name ADT Inc.      
Entity Address, Address Line One 1501 Yamato Road      
Entity Address, City or Town Boca Raton      
Entity Address, State or Province FL      
Entity Address, Postal Zip Code 33431      
City Area Code 561      
Local Phone Number 988-3600      
Entity Interactive Data Current Yes      
Entity Central Index Key 0001703056      
Current Fiscal Year End Date --12-31      
Document Type 10-Q      
Document Period End Date Jun. 30, 2021      
Entity File Number 001-38352      
Document Fiscal Year Focus 2021      
Document Fiscal Period Focus Q2      
Amendment Flag false      
Entity Small Business false      
Entity Emerging Growth Company false      
Entity Shell Company false      
Entity Current Reporting Status Yes      
Security Exchange Name NYSE      
Entity Filer Category Large Accelerated Filer      
Common Stock        
Document Information [Line Items]        
Common Stock, Par or Stated Value Per Share $ 0.01   $ 0.01  
Entity Common Stock, Shares Outstanding   766,752,442    
Common Class B        
Document Information [Line Items]        
Common Stock, Par or Stated Value Per Share $ 0.01   $ 0.01 $ 0.01
Entity Common Stock, Shares Outstanding   54,744,525