Revenues - Summary of Deferred Revenue from Contract with Customers (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Mar. 31, 2019	Mar. 31, 2019
Deferred Revenue [Abstract]
Balance, beginning of period	$ 430	$ 510
Deferral of revenue	934	2,271
Recognition of deferred revenue	(883)	(2,300)
Other	(21)	(21)
Balance, end of period	$ 460	$ 460