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Basis of Presentation and Summary of Significant Accounting Policies (Narrative, Receivables) (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount | $ 729 | $ 687 | $ 626 | $ 494
Finance notes and related accrued interest, net, total | 104 | 103 |  |
Finance notes and related accrued interest, net, current | $ 12 | 12 |  |
Minimum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Receivable financing agreement term | 1 year |  |  |
Maximum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Receivable financing agreement term | 5 years |  |  |
SEC Schedule, 12-09, Allowance, Credit Loss [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount | $ 206 | 193 | 139 | 137
SEC Schedule, 12-09, Allowance, Loss on Finance Receivable [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount | $ 27 | $ 14 | $ 7 | $ 9

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