Income Taxes - Schedule of Components of Deferred Tax Assets and Liabilities (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
Deferred tax assets:
Accrued liabilities	$ 49	$ 61
Capital loss carryforwards	1,120	1,124
Retirement benefit obligations	89	105
Net operating loss carryforwards	262	275
Business credits	47	20
Other	225	155
Total deferred tax assets	1,792	1,740
Deferred tax liabilities:
Asset basis difference and amortization	(376)	(366)
Other	(61)	(2)
Total deferred tax liabilities	(437)	(368)
Net deferred tax asset before valuation allowance	1,355	1,372
Less: valuation allowance (See Note 20 - Valuation and Qualifying Accounts)	(1,393)	(1,391)
Net deferred tax liabilities	$ (38)	$ (19)