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Income Taxes - Summary of Income Tax Contingencies (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
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Income Tax Disclosure [Abstract] |  |  |
Tax effected unrecognized tax benefits that, if recognized, would affect the effective tax rate | $ 1,427 | $ 1,466 | $ 1,533
Net accrued interest | $ 459 | $ 398 | $ 329

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