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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
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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Deferred Taxes [Line Items]

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