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Cover Page - USD ($)
 12 Months Ended
Jun. 30, 2021
Jul. 30, 2021
Dec. 31, 2020
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Jun. 30, 2021    
Document Transition Report false    
Entity File Number 1-5397    
Entity Registrant Name AUTOMATIC DATA PROCESSING, INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 22-1467904    
Entity Address, Address Line One One ADP Boulevard    
Entity Address, City or Town Roseland,    
Entity Address, State or Province NJ    
Entity Address, Postal Zip Code 07068    
City Area Code 973    
Local Phone Number 974-5000    
Title of 12(b) Security Common Stock, $0.10 Par Value(voting)    
Trading Symbol ADP    
Security Exchange Name NASDAQ    
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     $ 75,329,818,310
Entity Common Stock, Shares Outstanding   423,080,556  
Documents Incorporated by Reference
Portions of the Registrant's Proxy Statement for its 2021 Annual Meeting of Stockholders.Part III
    
Amendment Flag false    
Entity Central Index Key 0000008670    
Current Fiscal Year End Date --06-30    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY