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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Sep. 30, 2022
Income Tax Examination [Line Items] |  |  |  |  |
Effective income tax rate | 41.50% | 12.10% | 22.40% | 17.20% |
Gross tax effected unrecognized tax benefits |  |  |  |  | $ 2,537
Amount of unrecognized tax benefits which may impact effective tax rate |  |  |  |  | 1,973
Total net accrued interest, net of tax benefit |  |  |  |  | $ 284
Unrecognized tax benefits, income tax penalties and interest expense |  |  | $ 33 | $ 40 |
Unrecognized tax benefits, period decrease | $ 438 |  |  |  |
Restructuring and impairment costs | 81 | $ 121 | 844 | 554 |
Restructuring charges, tax benefit | $ 11 | $ 15 | $ 98 | $ 29 |
IRELAND |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Ireland statutory income tax rate | 12.50% | 12.50% | 12.50% | 12.50% |

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