Statements of Consolidated Earnings (Parenthetical) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Income Statement [Abstract]
Direct pass-through costs PEO revenues	$ 17,301.8	$ 16,826.6	$ 50,688.4	$ 46,863.8

Direct pass-through costs associated with PEO, primarily consisting of payroll wages and payroll taxes.

No definition available.

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