Segment Information - Reconciliation of Assets from Segments to Consolidated (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Jun. 30, 2020
Segment Reporting, Asset Reconciling Item [Line Items]
Investments	$ 353	$ 297
Total assets	15,094	14,261
Digital Real Estate Services
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	2,617	2,322
Subscription Video Services
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	3,604	3,459
Dow Jones
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	2,475	2,480
Book Publishing
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	2,422	2,212
News Media
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	2,210	1,994
Other
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 1,413	$ 1,497