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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
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)