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Income Taxes - Deferred Taxes Classified in Consolidated Statements of Financial Position (Detail) - USD ($) $ in Millions | Sep. 30, 2025 | Sep. 30, 2024
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Deferred Taxes [Line Items] |  |
Deferred tax assets | $ 2,703 | $ 3,077
Deferred tax liabilities | (1,111) | (1,409)
Net deferred tax asset | 1,592 | 1,668
Other noncurrent assets |  |
Deferred Taxes [Line Items] |  |
Deferred tax assets | 1,777 | 1,969
Other noncurrent liabilities |  |
Deferred Taxes [Line Items] |  |
Deferred tax liabilities | $ (185) | $ (301)

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