Basis of Presentation and Summary of Significant Accounting Policies (Narrative, Inventories) (Details) - USD ($) $ in Millions	Jun. 30, 2019	Jun. 30, 2018
Accounting Policies [Abstract]
Portion of inventories held at LIFO, percentage	56.00%	56.00%
Inventories valued at LIFO amount higher than average cost value	$ 230	$ 92
Reserves for excess and obsolete inventory	$ 171	$ 147

Amount of valuation reserve for inventory.

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-Name Accounting Standards Codification
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-SubTopic 10
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant