Additional Financial Information (Components of Accounts Payable, Accrued Expenses and Other Current Liabilities) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Jun. 30, 2020
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Accrued expenses	$ 1,070	$ 907
Program rights payable	625	485
Deferred revenue	214	152
Operating lease liabilities	90	122
Other current liabilities	237	240
Total accounts payable, accrued expenses and other current liabilities	$ 2,236	$ 1,906