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Statements Of Consolidated Earnings (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2019
Income Statement [Abstract] |  |  |
Direct pass-through costs, Professional Employer Organization revenues | $ 51,362.3 | $ 45,826.1 | $ 42,688.8

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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
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Namespace Prefix: | adp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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