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Income Taxes - Deferred Taxes Classified in Consolidated Statements of Financial Position (Detail) - USD ($) $ in Millions | Sep. 30, 2022 | Sep. 30, 2021
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Deferred Taxes [Line Items] |  |
Deferred tax assets | $ 1,821 | $ 1,768
Deferred tax liabilities | (1,377) | (1,456)
Net deferred tax asset | 444 | 312
Other noncurrent assets |  |
Deferred Taxes [Line Items] |  |
Deferred tax assets | 944 | 755
Other noncurrent liabilities |  |
Deferred Taxes [Line Items] |  |
Deferred tax liabilities | $ (500) | $ (443)

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