Income Taxes - Schedule of Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions	Jun. 30, 2015	Jun. 30, 2014
Deferred tax assets:
Accrued liabilities	$ 56	$ 49
Capital loss carryforwards	892	1,120
Retirement benefit obligations	85	89
Net operating loss carryforwards	541	262
Business credits	46	47
Other	307	225
Total deferred tax assets	1,927	1,792
Deferred tax liabilities:
Asset basis difference and amortization	(468)	(376)
Other	(41)	(61)
Total deferred tax liabilities	(509)	(437)
Net deferred tax asset before valuation allowance	1,418	1,355
Less: valuation allowance (See Note 20 - Valuation and Qualifying Accounts)	(1,308)	(1,393)
Net deferred tax assets (liabilities)	$ 110	$ (38)