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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Tax Credit Carryforward [Line Items] |  |  |  |
US income before taxes | $ 14,537,000,000 | $ 13,339,000,000 | $ 11,051,000,000 |
Deferred tax assets, net | $ 1,641,000,000 | $ 1,553,000,000 |  |
Effective income tax rate (in percent) | 17.00% | 18.00% | 18.00% |
Recognized tax benefit | $ 223,000,000 | $ 142,000,000 | $ 176,000,000 |
Income taxes receivable included in prepaid and other current assets | 832,000,000 | 206,000,000 |  |
Income taxes payable included in accrued taxes as part of accrued liabilities | 577,000,000 | 1,500,000,000 |  |
Accrued income taxes included in other long-term liabilities | 1,400,000,000 | 1,900,000,000 |  |
Decreased Singapore tax as a result of the tax incentive agreement | $ 419,000,000 | $ 468,000,000 | $ 362,000,000 |
Benefit of the tax incentive agreement on diluted net income per share (in dollars per share) | $ 0.21 | $ 0.22 | $ 0.17 |
Total unrecognized tax benefits exclusive of interest and penalties | $ 3,750,000,000 | $ 3,497,000,000 | $ 2,683,000,000 | $ 2,488,000,000
Unrecognized tax benefits, if recognized, would reduce the effective tax rate in a future period | 1,400,000,000 | 1,600,000,000 | 1,300,000,000 |
Interest expense included in interest expense and administrative and other | 29,000,000 | 34,000,000 | 15,000,000 |
Accrued penalties related to uncertain tax positions | 0 | 0 | 31,000,000 |
Accrued interest related to uncertain tax positions in other long term liabilities | 300,000,000 | 271,000,000 |  |
Foreign Country |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Net operating loss carryforwards | 894,000,000 |  |  |
Other Assets |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Deferred tax assets, net | 140,000,000 | 126,000,000 |  |
Non-current income tax receivable | 442,000,000 | 961,000,000 |  |
Non United States Customers |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
US income before taxes | $ 5,100,000,000 | $ 4,200,000,000 | $ 3,600,000,000 |

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