Segment Information - Summary of Revenues by Segment by Component to Consolidated (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Disaggregation Of Revenue [Line Items]
Revenues	$ 4,441	$ 4,087	$ 7,486	$ 6,804
Operating Segments | Cable Network Programming
Disaggregation Of Revenue [Line Items]
Revenues	1,638	1,488	3,054	2,813
Operating Segments | Cable Network Programming | Affiliate fee
Disaggregation Of Revenue [Line Items]
Revenues	1,039	928	2,065	1,901
Operating Segments | Cable Network Programming | Advertising
Disaggregation Of Revenue [Line Items]
Revenues	454	441	765	740
Operating Segments | Cable Network Programming | Other
Disaggregation Of Revenue [Line Items]
Revenues	145	119	224	172
Operating Segments | Television
Disaggregation Of Revenue [Line Items]
Revenues	2,759	2,556	4,340	3,906
Operating Segments | Television | Affiliate fee
Disaggregation Of Revenue [Line Items]
Revenues	649	590	1,290	1,150
Operating Segments | Television | Advertising
Disaggregation Of Revenue [Line Items]
Revenues	1,954	1,841	2,773	2,511
Operating Segments | Television | Other
Disaggregation Of Revenue [Line Items]
Revenues	156	125	277	245
Operating Segments | Other, Corporate and Eliminations
Disaggregation Of Revenue [Line Items]
Revenues	$ 44	$ 43	$ 92	$ 85