Additional Financial Information - Components of Other Non-Current Assets (Detail) - USD ($) $ in Millions		Sep. 30, 2018	Jul. 01, 2018	Jun. 30, 2018
Assets, Noncurrent [Abstract]
Royalty advances to authors		$ 322		$ 312
Inventory	[1]	146		143
Other		429		376
Total Other non-current assets		$ 897	$ 923	$ 831

[1] Primarily consists of the non-current portion of programming rights.