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Statements of Consolidated Earnings (Parenthetical) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2026 | Mar. 31, 2025 | Mar. 31, 2026 | Mar. 31, 2025
Income Statement [Abstract] |  |  |  |
Direct pass-through costs PEO revenues | $ 21,484.7 | $ 20,293.3 | $ 60,566.0 | $ 56,907.7

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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
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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
Name: | us-gaap_IncomeStatementAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration