SEGMENT INFORMATION - Schedule of Reconciliation of Assets from Segments to Consolidated (Details) - USD ($) $ in Millions	Sep. 30, 2025	Jun. 30, 2025
Segment Reporting, Asset Reconciling Item [Line Items]
Investments	$ 1,028	$ 1,016
Total assets	15,343	15,504
Dow Jones
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	4,088	4,134
Digital Real Estate Services
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	3,192	3,202
Book Publishing
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	2,814	2,767
News Media
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	2,022	2,102
Other
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 2,199	$ 2,283