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Income Taxes - Summary of Income Tax Contingencies (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
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Income Tax Disclosure [Abstract] |  |  |
Tax effected unrecognized tax benefits that, if recognized, would affect the effective tax rate | $ 1,581 | $ 1,973 | $ 2,268
Net accrued interest | $ 335 | $ 284 | $ 252

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- Definition Amount of interest expense accrued for an underpayment of income taxes. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15 + Details
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- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15A + Details
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