Leasing Arrangements - Components of Lease Cost Recognized (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||||
|---|---|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
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| Lease cost: | ||||||
| Total lease cost | $ 10 | $ 10 | $ 31 | $ 31 | ||
| Selling General and Administrative Expenses [Member] | ||||||
| Lease cost: | ||||||
| Operating lease cost | [1] | 3 | 3 | 9 | 10 | |
| Variable lease cost | 1 | 1 | 4 | 4 | ||
| Cost of Sales [Member] | ||||||
| Lease cost: | ||||||
| Operating lease cost | 4 | 4 | 10 | 11 | ||
| Variable lease cost | 1 | 1 | 5 | 4 | ||
| Short-term leases | $ 1 | $ 1 | $ 3 | $ 2 | ||
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