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Income Taxes (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jan. 01, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Sep. 30, 2024
Income Tax Examination [Line Items] |  |  |  |  |  |
Effective income tax rate |  | 12.30% | 17.00% | 9.90% | 0.10% |
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 |  |  |  | $ 64 | $ 90 |
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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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 231 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-231 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12A -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12A Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482525/740-10-45-15 + Details
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