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Income Taxes - Narrative (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Components of Income Tax [Line Items] |  |  |  |
Effective income tax rate reconciliation, percent |  | 7.00% | (42.00%) | (16.00%)
Valuation allowance, deferred tax asset, increase (decrease), amount |  | $ 48 | $ 121 |
Unrecognized tax benefits, reduction resulting from lapse of applicable statute of limitations |  | 91 | 438 | $ 301
Restructuring and impairment costs |  | 510 | 1,049 | 701
Restructuring charges, benefit |  | 26 | 120 | $ 47
Income taxes receivable, current |  | 100 | 65 |
Taxes payable, current |  | 211 | $ 249 |
Undistributed earnings of foreign subsidiaries |  | 24,500 |  |
Operating loss carryforwards |  | 22,100 |  |
Net operating loss carry forwards that will expire |  | 11,800 |  |
Tax credit carryforward, amount |  | 35 |  |
Switzerland |  |  |  |
Components of Income Tax [Line Items] |  |  |  |
Impact on deferred tax assets (less than) |  | $ (80) |  |
Statutory rate | 15.00% |  |  |

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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 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 + Details
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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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