Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, Percent	22.10%	213.80%	32.70%
Deferred income tax assets:
Receivable basis difference	$ 35	$ 41
Accrued liabilities	133	110
Share-based compensation	39	40
Loss and tax credit carryforwards	621	526
Deferred tax assets related to uncertain tax positions	30	30
Other	6	101
Total deferred income tax assets	864	848
Valuation allowance for deferred income tax assets	(542)	(412)
Net deferred income tax assets	322	436
Deferred income tax liabilities:
Inventory basis differences	(1,056)	(1,103)
Property-related	(171)	(176)
Goodwill and other intangibles	(808)	(934)
Total deferred income tax liabilities	(2,035)	(2,213)
Net deferred income tax liability	$ (1,713)	$ (1,777)