Debt and Other Financing Activities - U.S. Accounts Receivable Sales Program - Additional Information (Details) - U.S. Accounts Receivable Sales Program [Member] - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
Sep. 30, 2024 |
|
| Disclosure Of Sales Program Of Receivable [Line Items] | |||||
| Loss on sale of receivables | $ 1 | $ 1 | $ 3 | $ 3 | |
| Sales against the buyers limit | 60 | $ 71 | |||
| Maximum limit of receivables can transfer | 60 | 71 | |||
| Amount transferred in accounts receivable | 76 | 85 | |||
| Gross cash proceeds received for accounts receivable transferred | 290 | 244 | |||
| Cash proceeds collected | 301 | 233 | |||
| Increase (decrease) in account receivable sales volume | 11 | $ 11 | |||
| Maximum [Member] | |||||
| Disclosure Of Sales Program Of Receivable [Line Items] | |||||
| Recorded liabilities related to service obligations and limited guarantee | $ 1 | $ 1 | $ 1 | ||