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Cover Page - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Feb. 22, 2022
Jun. 30, 2021
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2021    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-38352    
Entity Registrant Name ADT Inc.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 47-4116383    
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    
Title of 12(b) Security Common Stock, par value $0.01 per share    
Trading Symbol ADT    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 1,635
Entity Common Stock, Unvested Shares 9,476,089    
Documents Incorporated by Reference Portions of the registrant’s definitive proxy statement for use in connection with its 2022 Annual Meeting of Shareholders, which is to be filed no later than 120 days after December 31, 2021, are incorporated by reference into Part III of this Annual Report on Form 10-K.    
Entity Central Index Key 0001703056    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Amendment Flag false    
Common stock      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   846,839,865  
Class B common stock      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   54,744,525