Additional Financial Information - Components of Other, Net (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Other Income and Expenses [Abstract]
Dividends received from equity security investments	$ 22	$ 0	$ 23	$ 0
Remeasurement of equity securities	(44)	0	(29)	0
Write-down of available-for-sale securities	0	(30)	0	(30)
Gain on sale of Australian property	12	0	12	0
Other, net	17	0	21	9
Total Other, net	$ 7	$ (30)	$ 27	$ (21)