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Income Taxes - Deferred Taxes Classified in Consolidated Statements of Financial Position (Detail) - USD ($) $ in Millions | Sep. 30, 2023 | Sep. 30, 2022
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Deferred Taxes [Line Items] |  |
Deferred tax assets | $ 2,134 | $ 1,832
Deferred tax liabilities | (1,046) | (1,381)
Net deferred tax asset | 1,088 | 451
Other noncurrent assets |  |
Deferred Taxes [Line Items] |  |
Deferred tax assets | 1,499 | 954
Other noncurrent liabilities |  |
Deferred Taxes [Line Items] |  |
Deferred tax liabilities | $ (411) | $ (503)

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