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Income Taxes - Deferred Income Taxes (Detail) - USD ($) $ in Millions | Sep. 30, 2022 | Sep. 30, 2021
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Compensation and benefits, assets | $ 430 | $ 524
Loss and credit carryforwards, assets | 2,185 | 2,107
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Reserves | 133 | 191
Other, assets | 524 | 549
Deferred income taxes, assets, gross | 3,271 | 3,370
Valuation allowance, assets | (2,093) | (2,036)
Deferred income taxes, assets | 1,178 | 1,334
Property and equipment, liabilities | 412 | 400
Deferred Tax Liabilities, Other Finite-Lived Assets | 2,002 | 2,161
Other, liabilities | 260 | 123
Deferred income taxes, liabilities, gross | 2,674 | 2,684
Deferred income taxes, liabilities | $ 2,674 | $ 2,684

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