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Income Taxes - Narrative (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Sep. 11, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Components of Income Tax [Line Items] |  |  |  |  |
Effective income tax rate reconciliation, percent |  |  | (19.00%) | (1.00%) | 33.00%
Valuation allowance, deferred tax asset, increase (decrease), amount |  |  | $ 121 | $ 27 |
Unrecognized tax benefits, reduction resulting from lapse of applicable statute of limitations |  |  | 438 | 301 |
Restructuring and impairment costs |  |  | 1,064 | 721 | $ 242
Restructuring charges, benefit |  |  | 122 | 50 | 39
Intellectual property transactions and adjustments |  |  | (176) | 0 | 417
Income taxes receivable, current |  |  | 65 | 253 |
Taxes payable, current |  |  | 249 | $ 143 |
Undistributed earnings of foreign subsidiaries |  |  | 24,400 |  |
Operating loss carryforwards |  |  | 24,400 |  |
Net operating loss carry forwards that will expire |  |  | 14,100 |  |
Tax credit carryforward, amount |  |  | $ 35 |  |
Forecast |  |  |  |  |
Components of Income Tax [Line Items] |  |  |  |  |
Impact on deferred tax assets (less than) |  | $ 100 |  |  |
CANADA |  |  |  |  |
Components of Income Tax [Line Items] |  |  |  |  |
Valuation allowance, deferred tax asset, increase (decrease), amount |  |  |  |  | (39)
Mexico |  |  |  |  |
Components of Income Tax [Line Items] |  |  |  |  |
Valuation allowance, deferred tax asset, increase (decrease), amount |  |  |  |  | $ (105)
IRELAND |  |  |  |  |
Components of Income Tax [Line Items] |  |  |  |  |
Statutory rate |  |  | 12.50% | 12.50% | 12.50%
Switzerland |  |  |  |  |
Components of Income Tax [Line Items] |  |  |  |  |
Statutory rate | 15.00% |  |  |  |

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- Definition Net operating loss carryforwards that will expire. + References No definition available. + Details
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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + 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 + Details
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- Definition Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to disposition of asset. Includes, but is not limited to, intra-entity transfer of asset other than inventory. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 + Details
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- Definition Carrying amount due within one year of the balance sheet date (or one operating cycle, if longer) from tax authorities as of the balance sheet date representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)(a)(4)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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