Segment Information - Schedule of Revenues by Segment by Component to Consolidated (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Disaggregation Of Revenue [Line Items]
Revenues	$ 5,078	$ 4,234	$ 8,642	$ 7,441
Corporate and Other
Disaggregation Of Revenue [Line Items]
Revenues	58	49	123	103
Eliminations
Disaggregation Of Revenue [Line Items]
Revenues	(106)	(15)	(157)	(29)
Cable Network Programming | Operating Segments
Disaggregation Of Revenue [Line Items]
Revenues	2,165	1,658	3,762	3,045
Cable Network Programming | Affiliate fee | Operating Segments
Disaggregation Of Revenue [Line Items]
Revenues	1,076	1,031	2,113	2,036
Cable Network Programming | Advertising | Operating Segments
Disaggregation Of Revenue [Line Items]
Revenues	460	348	781	638
Cable Network Programming | Other | Operating Segments
Disaggregation Of Revenue [Line Items]
Revenues	629	279	868	371
Television | Operating Segments
Disaggregation Of Revenue [Line Items]
Revenues	2,961	2,542	4,914	4,322
Television | Affiliate fee | Operating Segments
Disaggregation Of Revenue [Line Items]
Revenues	824	756	1,630	1,491
Television | Advertising | Operating Segments
Disaggregation Of Revenue [Line Items]
Revenues	1,962	1,654	2,970	2,564
Television | Other | Operating Segments
Disaggregation Of Revenue [Line Items]
Revenues	$ 175	$ 132	$ 314	$ 267