Additional Financial Information (Components of Accounts Payable, Accrued Expenses and Other Current Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Jun. 30, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Accrued expenses	$ 832	$ 835
Program rights payable	535	514
Deferred revenue	158	169
Operating lease liabilities	142	0
Other current liabilities	149	194
Total accounts payable, accrued expenses and other current liabilities	$ 1,816	$ 1,712