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Income Taxes - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Tax Credit Carryforward [Line Items] |  |  |  |
US income before taxes | $ 14,776 | $ 14,537 | $ 13,339 |
Deferred tax assets, net | $ 1,528 | $ 1,641 |  |
Effective income tax rate (in percent) | 17.00% | 17.00% | 18.00% |
Recognized tax benefit | $ 263 | $ 223 | $ 142 |
Income taxes receivable included in prepaid and other current assets | 232 | 832 |  |
Income taxes payable included in accrued taxes as part of accrued liabilities | 512 | 577 |  |
Accrued income taxes included in other long-term liabilities | 309 | 1,400 |  |
Decreased Singapore tax as a result of the tax incentive agreement | $ 453 | $ 419 | $ 468 |
Benefit of the tax incentive agreement on diluted net income per share (in dollars per share) | $ 0.23 | $ 0.21 | $ 0.22 |
Total unrecognized tax benefits exclusive of interest and penalties | $ 1,672 | $ 3,750 | $ 3,497 | $ 2,683
Unrecognized tax benefits, if recognized, would reduce the effective tax rate in a future period | 1,500 | 1,400 | 1,600 |
Interest expense included in interest expense and administrative and other | 140 | 29 | 34 |
Accrued interest related to uncertain tax positions in other long term liabilities | 160 | 300 |  |
Foreign Country |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Net operating loss carryforwards | 1,100 |  |  |
Other Assets |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Deferred tax assets, net | 128 | 140 |  |
Non-current income tax receivable | 427 | 442 |  |
Non United States Customers |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
US income before taxes | $ 6,000 | $ 5,100 | $ 4,200 |

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