Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, Percent	213.80%	32.70%	37.10%
Deferred income tax assets:
Receivable basis difference	$ 41	$ 42
Accrued liabilities	110	125
Share-based compensation	40	53
Loss and tax credit carryforwards	526	378
Deferred tax assets related to uncertain tax positions	30	51
Other	101	43
Total deferred income tax assets	848	692
Valuation allowance for deferred income tax assets	(412)	(237)
Net deferred income tax assets	436	455
Deferred income tax liabilities:
Inventory basis differences	(1,103)	(1,578)
Property-related	(176)	(183)
Goodwill and other intangibles	(934)	(570)
Total deferred income tax liabilities	(2,213)	(2,331)
Net deferred income tax liability	$ (1,777)	$ (1,876)