Segment Information (Summary of Revenues by Segment by Component to Consolidated) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Disaggregation Of Revenue [Line Items]
Revenues	$ 3,440	$ 2,752	$ 9,885	$ 8,876
Operating Segments | Cable Network Programming Segment
Disaggregation Of Revenue [Line Items]
Revenues	1,467	1,383	4,221	4,082
Operating Segments | Cable Network Programming Segment | Affiliate Fee
Disaggregation Of Revenue [Line Items]
Revenues	1,006	968	2,902	2,845
Operating Segments | Cable Network Programming Segment | Advertising
Disaggregation Of Revenue [Line Items]
Revenues	304	276	895	893
Operating Segments | Cable Network Programming Segment | Other
Disaggregation Of Revenue [Line Items]
Revenues	157	139	424	344
Operating Segments | Television Segment
Disaggregation Of Revenue [Line Items]
Revenues	1,926	1,370	5,548	4,796
Operating Segments | Television Segment | Affiliate Fee
Disaggregation Of Revenue [Line Items]
Revenues	553	452	1,487	1,257
Operating Segments | Television Segment | Advertising
Disaggregation Of Revenue [Line Items]
Revenues	1,266	812	3,726	3,245
Operating Segments | Television Segment | Other
Disaggregation Of Revenue [Line Items]
Revenues	107	106	335	294
Operating Segments | Other, Corporate and Eliminations Segment
Disaggregation Of Revenue [Line Items]
Revenues	$ 47	$ (1)	$ 116	$ (2)