Income Taxes - Schedule of Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions	Jun. 30, 2017	Jun. 30, 2016
Deferred tax assets:
Accrued liabilities	$ 80	$ 185
Capital loss carryforwards	904	803
Retirement benefit obligations	101	112
Net operating loss carryforwards	473	580
Business credits	69	38
Other	284	213
Total deferred tax assets	1,911	1,931
Deferred tax liabilities:
Asset basis difference and amortization	(204)	(421)
Other	(56)	(65)
Total deferred tax liabilities	(260)	(486)
Net deferred tax asset before valuation allowance	1,651	1,445
Less: valuation allowance (See Note 21-Valuation and Qualifying Accounts)	(1,187)	(1,014)
Net deferred tax assets	$ 464	$ 431