Income Taxes - Schedule of Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions	Jun. 30, 2019	Jun. 30, 2018
Deferred tax assets:
Accrued liabilities	$ 78	$ 95
Capital loss carryforwards	923	889
Retirement benefit obligations	53	38
Net operating loss carryforwards	397	348
Business tax credits	78	62
Other	210	294
Total deferred tax assets	1,739	1,726
Deferred tax liabilities:
Asset basis difference and amortization	(266)	(362)
Other	(31)	(89)
Total deferred tax liabilities	(297)	(451)
Net deferred tax asset before valuation allowance	1,442	1,275
Less: valuation allowance (See Note 22 —Valuation and Qualifying Accounts)	(1,468)	(1,385)
Net deferred tax liabilities	$ (26)	$ (110)