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Statements of Consolidated Earnings (Parenthetical) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Income Statement [Abstract] |  |  |  |
Direct pass-through costs PEO revenues | $ 13,349.1 | $ 12,371.6 | $ 24,364.9 | $ 22,882.2

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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