SEGMENT INFORMATION - Schedule of Reconciliation of Assets from Segments to Consolidated (Details) - USD ($) $ in Millions	Sep. 30, 2026	Jun. 30, 2026
Segment Reporting [Line Items]
Investments	$ 1,048	$ 1,002
Total assets	15,436	15,544
Dow Jones
Segment Reporting [Line Items]
Total assets	4,140	4,159
Digital Real Estate Services
Segment Reporting [Line Items]
Total assets	3,442	3,515
Book Publishing
Segment Reporting [Line Items]
Total assets	2,861	2,743
News Media
Segment Reporting [Line Items]
Total assets	2,031	2,044
Other
Segment Reporting [Line Items]
Total assets	$ 1,914	$ 2,081