Programming and Other Inventory (Narrative) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2020 USD ($)
TV Entertainment Segment [Member] | Operating Segments [Member] | Operating Expense [Member]
Segment Reporting Information [Line Items]
Programming charges	$ 66
Cable Networks [Member] | Operating Segments [Member] | Operating Expense [Member]
Segment Reporting Information [Line Items]
Programming charges	50
Filmed Entertainment [Member] | Operating Segments [Member] | Operating Expense [Member]
Segment Reporting Information [Line Items]
Programming charges	5
COVID-19 [Member]
Segment Reporting Information [Line Items]
Programming charges	$ 121