Income Taxes - Schedule of Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions	Jun. 30, 2018	Jun. 30, 2017
Deferred tax assets:
Accrued liabilities	$ 95	$ 80
Capital loss carryforwards	889	904
Retirement benefit obligations	38	101
Net operating loss carryforwards	348	473
Business tax credits	62	69
Other	294	284
Total deferred tax assets	1,726	1,911
Deferred tax liabilities:
Asset basis difference and amortization	(362)	(204)
Other	(89)	(56)
Total deferred tax liabilities	(451)	(260)
Net deferred tax asset before valuation allowance	1,275	1,651
Less: valuation allowance (See Note 22 -Valuation and Qualifying Accounts)	(1,385)	(1,187)
Net deferred tax (liabilities) assets		$ 464
Net deferred tax liabilities	$ (110)