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Derivative Instruments and Hedging Activities - Narrative (Details) € in Millions | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2024 CNY (¥) | Aug. 30, 2024 USD ($) | Aug. 30, 2024 EUR (€) | Jun. 30, 2024 USD ($) | Jun. 30, 2024 CNY (¥) | Mar. 31, 2024 USD ($) | Mar. 31, 2024 CNY (¥) | Oct. 31, 2023 | Mar. 31, 2023 USD ($) | Mar. 31, 2023 CNY (¥) | Sep. 30, 2022 CNY (¥)
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of foreign exchange rate exposure hedged, minimum | 70.00% |  |  | 70.00% |  |  |  |  |  |  |  |  |  |
Percentage of foreign exchange rate exposure hedged, maximum | 90.00% |  |  | 90.00% |  |  |  |  |  |  |  |  |  |
Cash collateral received | $ 0 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |
Cash collateral pledged | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |
Pretax loss on cash flow hedges | 23,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency exchange derivatives | Net investment hedging |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective portion of pretax gains (loss) related to net investment hedges | (5,000,000) | (67,000,000) | $ 151,000,000 |  |  |  |  |  |  |  |  |  |  |
Gains (losses) reclassified into income for net investment hedges | 0 | 0 | 0 |  |  |  |  |  |  |  |  |  |  |
Foreign currency exchange derivatives | Cash flow hedging |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) for ineffective portion of cash flow hedge | 0 | 0 | 0 |  |  |  |  |  |  |  |  |  |  |
China | Cross-currency interest rate swaps | Net investment hedging |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional value of derivative asset | 17,000,000 |  | $ 23,000,000 | ¥ 120,000,000 |  |  | $ 78,000,000 | ¥ 570,000,000 | $ 96,000,000 | ¥ 685,000,000 |  | $ 35,000,000 | ¥ 240,000,000 | ¥ 150,000,000
3.50% Notes due in 2024 | Unsecured debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, gross | $ 0 | $ 130,000,000 |  |  | $ 132,000,000 | € 123 |  |  |  |  |  |  |  |
Interest rate | 3.50% | 3.50% |  | 3.50% |  |  |  |  |  |  | 3.50% |  |  |

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