Segment Information (Summary of Revenues by Segment by Component to Consolidated) (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Disaggregation Of Revenue [Line Items]
Revenues	$ 2,717	$ 2,667
Operating Segments | Cable Network Programming Segment
Disaggregation Of Revenue [Line Items]
Revenues	1,325	1,285
Operating Segments | Cable Network Programming Segment | Affiliate Fee
Disaggregation Of Revenue [Line Items]
Revenues	973	939
Operating Segments | Cable Network Programming Segment | Advertising
Disaggregation Of Revenue [Line Items]
Revenues	299	254
Operating Segments | Cable Network Programming Segment | Other
Disaggregation Of Revenue [Line Items]
Revenues	53	92
Operating Segments | Television Segment
Disaggregation Of Revenue [Line Items]
Revenues	1,350	1,356
Operating Segments | Television Segment | Affiliate Fee
Disaggregation Of Revenue [Line Items]
Revenues	560	455
Operating Segments | Television Segment | Advertising
Disaggregation Of Revenue [Line Items]
Revenues	670	787
Operating Segments | Television Segment | Other
Disaggregation Of Revenue [Line Items]
Revenues	120	114
Operating Segments | Other, Corporate and Eliminations Segment
Disaggregation Of Revenue [Line Items]
Revenues	$ 42	$ 26