Additional Financial Information (Components of Accounts Payable, Accrued Expenses and Other Current Liabilities) (Details) - USD ($) $ in Millions	Mar. 31, 2020	Jun. 30, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Accrued expenses	$ 764	$ 835
Program rights payable	533	514
Deferred revenue	149	169
Operating lease liabilities	134	0
Other current liabilities	200	194
Total accounts payable, accrued expenses and other current liabilities	$ 1,780	$ 1,712