Additional Financial Information - Components of Other, Net Included in Statement of Operations (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Other Income and Expenses [Line Items]
Remeasurement of equity securities	$ 33	$ (6)	$ 42	$ (5)
Total Other, net	54	2	71	6
Nonoperating Income (Expense)
Other Income and Expenses [Line Items]
Remeasurement of equity securities	37	(6)	46	(5)
Dividends received from equity security investments	1	0	3	1
Gain on remeasurement of previously-held interest in Elara (Note 3)	7	0	7	0
Other	9	8	15	10
Total Other, net	$ 54	$ 2	$ 71	$ 6