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Income Taxes - Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jan. 01, 2024 | Mar. 31, 2025 | Sep. 30, 2023 | Mar. 31, 2025 | Mar. 31, 2024 | Sep. 30, 2024
Income Tax Examination [Line Items] |  |  |  |  |  |
Effective income tax rate |  | 5.20% | 32.50% | 8.00% | 114.60% |
Gross tax effected unrecognized tax benefits |  |  |  |  |  | $ 2,100
Amount of unrecognized tax benefits which may impact effective tax rate |  |  |  |  |  | 1,500
Total net accrued interest, net of tax benefit |  |  |  |  |  | $ 398
Unrecognized tax benefits, income tax penalties and interest expense |  |  |  | $ 54 | $ 59 |
Valuation allowance adjustment |  |  |  | $ 36 |  |
IRELAND |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |
Ireland statutory income tax rate |  | 12.50% | 12.50% | 12.50% | 12.50% |
SWITZERLAND |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |
Ireland statutory income tax rate | 15.00% |  |  |  |  |
Noncash discrete net tax benefit |  |  |  | $ 80 |  |

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