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Statements of Consolidated Earnings (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2023
Income Statement [Abstract] |  |  |
Direct pass-through costs, Professional Employer Organization revenues | $ 75,220.1 | $ 69,874.1 | $ 66,731.7

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- Definition Direct pass-through costs associated with PEO, primarily consisting of payroll wages and payroll taxes. + References No definition available. + Details
Name: | adp_DirectPassThroughCostsPEORevenues
Namespace Prefix: | adp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_IncomeStatementAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration