Additional Financial Information - Components of Other, Net Included in Statement of Operations (Detail) - USD ($) $ in Millions		3 Months Ended
		Sep. 30, 2019	Sep. 30, 2018
Other Income and Expenses [Line Items]
Remeasurement of equity securities		$ 1	$ 15
Total Other, net		4	20
Nonoperating Income (Expense) [Member]
Other Income and Expenses [Line Items]
Remeasurement of equity securities		1	15
Other	[1]	3	5
Total Other, net		$ 4	$ 20

[1] As a result of the adoption of ASU 2017-07 during the first quarter of fiscal 2019, the Company has included the other non-service cost components of net periodic benefit cost (income) in Other, net in the Statements of Operations for the three months ended September 30, 2019 and 2018.