Related Party Transactions and Twenty-First Century Fox, Inc. Investment (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Related Party Transactions [Abstract]
General Corporate Expenses	$ 111	$ 93	$ 291	$ 230