Additional Financial Information - Components of Other, Net Included in Statement of Operations (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Other Income and Expenses [Line Items]
Remeasurement of equity securities	$ (6)	$ (44)	$ (5)	$ (29)
Total Other, net	2	7	6	27
Nonoperating Income (Expense) [Member]
Other Income and Expenses [Line Items]
Dividends received from equity security investments	0	22	1	23
Remeasurement of equity securities	(6)	(44)	(5)	(29)
Gain on sale of Australian property	0	12	0	12
Other, net	8	17	10	21
Total Other, net	$ 2	$ 7	$ 6	$ 27