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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Tax Credit Carryforward [Line Items] |  |  |  |
US income before taxes | $ 13,339,000,000 | $ 11,051,000,000 | $ 11,002,000,000 |
Deferred tax assets, net | $ 1,553,000,000 | $ 1,167,000,000 |  |
Effective income tax rate (in percent) | 18.00% | 18.00% | 23.00% |
Recognized tax benefit | $ 142,000,000 | $ 176,000,000 |  |
Non-recurring, non-cash tax expense related to the remeasurement of UK deferred tax liabilities |  |  | $ 1,000,000,000 |
Effective income tax rate reconciliation, recognized tax benefit | 0 | 0 | 255,000,000 |
Income taxes receivable included in prepaid and other current assets | 206,000,000 | 190,000,000 |  |
Income taxes payable included in accrued taxes as part of accrued liabilities | 1,500,000,000 | 365,000,000 |  |
Accrued income taxes included in other long-term liabilities | 1,900,000,000 | 2,300,000,000 |  |
Increase (decrease) in Singapore tax as a result of the tax incentive agreement | $ (468,000,000) | $ (362,000,000) | $ (273,000,000) |
Benefit of the tax incentive agreement on diluted net income per share (in dollars per share) | $ 0.22 | $ 0.17 | $ 0.12 |
Total unrecognized tax benefits exclusive of interest and penalties | $ 3,497,000,000 | $ 2,683,000,000 | $ 2,488,000,000 | $ 2,579,000,000
Unrecognized tax benefits, if recognized, would reduce the effective tax rate in a future period | 1,600,000,000 | 1,300,000,000 | 1,300,000,000 |
Interest expense included in interest expense and administrative and other | 34,000,000 | 15,000,000 | 1,000,000 |
Accrued penalties related to uncertain tax positions | 0 | 31,000,000 | 0 |
Accrued interest related to uncertain tax positions in other long term liabilities | 271,000,000 | 238,000,000 |  |
Minimum |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Decrease in unrecognized tax benefits is reasonably possible | 400,000,000 |  |  |
Foreign Country |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Net operating loss carryforwards | 1,000,000,000 |  |  |
Other Assets |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Deferred tax assets, net | 126,000,000 | 87,000,000 |  |
Non-current income tax receivable | 961,000,000 | 1,000,000,000 |  |
Non United States Customers |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
US income before taxes | $ 4,200,000,000 | $ 3,600,000,000 | $ 3,100,000,000 |

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- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15 + Details
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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-2 + Details
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