Segment Information - Reconciliation of Assets from Segments to Consolidated (Detail) - USD ($) $ in Millions	Sep. 30, 2021	Jun. 30, 2021
Segment Reporting Information [Line Items]
Total assets	$ 23,161	$ 22,926
Investments	998	899
Operating Segments | Cable Network Programming
Segment Reporting Information [Line Items]
Total assets	2,557	2,577
Operating Segments | Television
Segment Reporting Information [Line Items]
Total assets	8,162	7,305
Operating Segments | Other, Corporate and Eliminations
Segment Reporting Information [Line Items]
Total assets	$ 11,444	$ 12,145