Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Jun. 30, 2019
Deferred income tax assets:
Receivable basis difference	$ 39	$ 35
Accrued liabilities	607	133
Share-based compensation	38	39
Loss and tax credit carryforwards	589	621
Deferred tax assets related to uncertain tax positions	52	30
Other	87	6
Total deferred income tax assets	1,412	864
Valuation allowance for deferred income tax assets	(470)	(542)
Net deferred income tax assets	942	322
Deferred income tax liabilities:
Inventory basis differences	(1,083)	(1,056)
Property-related	(327)	(171)
Goodwill and other intangibles	(751)	(808)
Total deferred income tax liabilities	(2,161)	(2,035)
Net deferred income tax liability	$ (1,219)	$ (1,713)