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Basis of Presentation and Summary of Significant Accounting Policies (Narrative, Inventories) (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Accounting Policies [Abstract]
Portion of inventories held at LIFO, percentage	50.00%	56.00%
Inventories valued at LIFO amount higher than average cost value	$ 565	$ 411
Reserves for excess and obsolete inventory	185	$ 155
Inventory Write-down	$ 197

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Amount by which inventory stated at last-in first-out (LIFO) is less than (in excess of) inventory stated at other inventory cost methods.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.6(c))
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Amount of valuation reserve for inventory.

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-Topic 330
-SubTopic 10
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Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

+ References

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-Publisher FASB
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-Topic 330
-SubTopic 10
-Section 50
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The percentage of LIFO (last in first out) inventory to total inventory as of the balance sheet date if other than 100 percent.

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