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Income Taxes - Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jan. 01, 2024 | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Sep. 30, 2023
Income Tax Examination [Line Items] |  |  |  |  |  |
Effective income tax rate |  | 17.70% | (41.50%) | 7.50% | (22.40%) |
Gross tax effected unrecognized tax benefits |  |  |  |  |  | $ 2,200
Amount of unrecognized tax benefits which may impact effective tax rate |  |  |  |  |  | 1,600
Total net accrued interest, net of tax benefit |  |  |  |  |  | $ 335
Unrecognized tax benefits, income tax penalties and interest expense |  |  |  | $ 92 | $ 33 |
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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