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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
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)