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Income Taxes - Deferred Income Taxes (Detail) - USD ($) $ in Millions | Sep. 30, 2023 | Sep. 30, 2022
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Compensation and benefits, assets | $ 426 | $ 430
Loss and credit carryforwards, assets | 2,352 | 2,185
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Reserves | 362 | 133
Deferred Tax Assets, Tax Deferred Expense, Capitalized Research And Development Costs | 243 | 63
Other, assets | 531 | 524
Deferred income taxes, assets, gross | 3,914 | 3,335
Valuation allowance, assets | (2,272) | (2,093)
Deferred income taxes, assets | 1,642 | 1,242
Property and equipment, liabilities | 409 | 412
Deferred Tax Liabilities, Other Finite-Lived Assets | 1,858 | 2,064
Other, liabilities | 183 | 260
Deferred income taxes, liabilities, gross | 2,450 | 2,736
Deferred income taxes, liabilities | $ 2,450 | $ 2,736

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