Additional Financial Information (Components of Accounts Payable, Accrued Expenses and Other Current Liabilities) (Details) - USD ($) $ in Millions	Sep. 30, 2019	Jun. 30, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Accrued expenses	$ 911	$ 835
Program rights payable	476	514
Deferred revenue	217	169
Operating lease liabilities	145	0
Other current liabilities	141	194
Total accounts payable, accrued expenses and other current liabilities	$ 1,890	$ 1,712