Segment Information (Summary of Revenues by Segment by Component to Consolidated) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Disaggregation Of Revenue [Line Items]
Revenues	$ 3,215	$ 3,440	$ 10,019	$ 9,885
Operating Segments | Cable Network Programming Segment
Disaggregation Of Revenue [Line Items]
Revenues	1,471	1,467	4,284	4,221
Operating Segments | Cable Network Programming Segment | Affiliate Fee
Disaggregation Of Revenue [Line Items]
Revenues	1,068	1,006	2,969	2,902
Operating Segments | Cable Network Programming Segment | Advertising
Disaggregation Of Revenue [Line Items]
Revenues	283	304	1,023	895
Operating Segments | Cable Network Programming Segment | Other
Disaggregation Of Revenue [Line Items]
Revenues	120	157	292	424
Operating Segments | Television Segment
Disaggregation Of Revenue [Line Items]
Revenues	1,695	1,926	5,601	5,548
Operating Segments | Television Segment | Affiliate Fee
Disaggregation Of Revenue [Line Items]
Revenues	651	553	1,801	1,487
Operating Segments | Television Segment | Advertising
Disaggregation Of Revenue [Line Items]
Revenues	915	1,266	3,426	3,726
Operating Segments | Television Segment | Other
Disaggregation Of Revenue [Line Items]
Revenues	129	107	374	335
Operating Segments | Other, Corporate and Eliminations Segment
Disaggregation Of Revenue [Line Items]
Revenues	$ 49	$ 47	$ 134	$ 116