SEGMENT INFORMATION - Reconciliation of Assets from Segments to Consolidated (Details) - USD ($) $ in Millions	Jun. 30, 2026	Jun. 30, 2025
Segment Reporting [Line Items]
Investments	$ 1,002	$ 1,016
Total assets	15,544	15,504
Dow Jones
Segment Reporting [Line Items]
Total assets	4,159	4,134
Digital Real Estate Services
Segment Reporting [Line Items]
Total assets	3,515	3,202
Book Publishing
Segment Reporting [Line Items]
Total assets	2,743	2,767
News Media
Segment Reporting [Line Items]
Total assets	2,044	2,102
Other
Segment Reporting [Line Items]
Total assets	$ 2,081	$ 2,283