SEGMENT INFORMATION - Schedule of Reconciliation of Assets from Segments to Consolidated (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2025	Dec. 31, 2024	Jun. 30, 2025
Segment Reporting, Asset Reconciling Item [Line Items]
Investments	$ 1,003		$ 1,003		$ 1,016
Total assets	15,510		15,510		15,504
Total Capital expenditures	99	$ 82	180	$ 157
Dow Jones
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	4,104		4,104		4,134
Total Capital expenditures	23	22	38	38
Digital Real Estate Services
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	3,378		3,378		3,202
Total Capital expenditures	37	36	75	75
Book Publishing
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	3,003		3,003		2,767
Total Capital expenditures	6	4	14	7
News Media
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	2,095		2,095		2,102
Total Capital expenditures	30	20	48	37
Other
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	1,927		1,927		$ 2,283
Total Capital expenditures	$ 3	$ 0	$ 5	$ 0