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Basis of Presentation and Summary of Significant Accounting Policies (Narrative, Receivables) (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for doubtful accounts | $ 662 | $ 677 | $ 720 | $ 832
Finance notes and related accrued interest, net, total | 32 | 43 |  |
Finance notes and related accrued interest, net, current | $ 7 | 14 |  |
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] |  |  |  |
Allowance for doubtful accounts | $ 213 | 233 | 240 | 207
SEC Schedule, 12-09, Allowance, Loss on Finance Receivable [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for doubtful accounts | $ 2 | $ 3 | $ 6 | $ 8

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