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Basis of Presentation and Summary of Significant Accounting Policies (Narrative, Sales Returns and Allowances) (Details) - USD ($) $ in Millions | 12 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2018
Accounting Policies [Abstract] |  |  |
Accrual for estimated sales returns and allowances | $ 495 | $ 479 |
Revenue Recognition, Sales Returns, Reserve for Sales Returns | $ 2,300 | $ 2,200 | $ 2,400

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- Definition Amount of estimated sales returns. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 + Details
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