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Basis of Presentation and Summary of Significant Accounting Policies (Narrative, Recent Financial Accounting Standards) (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Expected Impact of Lease Standard Adoption on Recognition of Operating Lease Liabilities | $ 400 |  |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount | $ 687 | $ 626 | $ 494 | $ 541

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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