Debt and Other Financing Activities - Summary of Information Related to Account Receivable Sales Program (Details) - USD ($) $ in Millions |
Jun. 30, 2026 |
Sep. 30, 2025 |
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|---|---|---|---|---|
| U.S. Accounts Receivable Sales Program [Member] | ||||
| Disclosure Of Sales Program Of Receivable [Line Items] | ||||
| Buyer limit | $ 68 | $ 59 | ||
| Sales outstanding | 68 | 59 | ||
| Receivables transferred to SPE (Special purpose entity) | 88 | 75 | ||
| Servicing and guarantee liability | [1] | 0 | 0 | |
| Foreign Accounts Receivable Sales Program [Member] | ||||
| Disclosure Of Sales Program Of Receivable [Line Items] | ||||
| Buyer limit | 109 | 103 | ||
| Sales outstanding | 109 | 103 | ||
| Receivables transferred to SPE (Special purpose entity) | 149 | 142 | ||
| Servicing and guarantee liability | [1] | $ 0 | $ 0 | |
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