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Income Taxes - Additional Information (Detail) - USD ($)
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Tax Credit Carryforward [Line Items]        
US income before taxes $ 13,339,000,000 $ 11,051,000,000 $ 11,002,000,000  
Deferred tax assets, net $ 1,553,000,000 $ 1,167,000,000    
Effective income tax rate (in percent) 18.00% 18.00% 23.00%  
Recognized tax benefit $ 142,000,000 $ 176,000,000    
Non-recurring, non-cash tax expense related to the remeasurement of UK deferred tax liabilities     $ 1,000,000,000  
Effective income tax rate reconciliation, recognized tax benefit 0 0 255,000,000  
Income taxes receivable included in prepaid and other current assets 206,000,000 190,000,000    
Income taxes payable included in accrued taxes as part of accrued liabilities 1,500,000,000 365,000,000    
Accrued income taxes included in other long-term liabilities 1,900,000,000 2,300,000,000    
Increase (decrease) in Singapore tax as a result of the tax incentive agreement $ (468,000,000) $ (362,000,000) $ (273,000,000)  
Benefit of the tax incentive agreement on diluted net income per share (in dollars per share) $ 0.22 $ 0.17 $ 0.12  
Total unrecognized tax benefits exclusive of interest and penalties $ 3,497,000,000 $ 2,683,000,000 $ 2,488,000,000 $ 2,579,000,000
Unrecognized tax benefits, if recognized, would reduce the effective tax rate in a future period 1,600,000,000 1,300,000,000 1,300,000,000  
Interest expense included in interest expense and administrative and other 34,000,000 15,000,000 1,000,000  
Accrued penalties related to uncertain tax positions 0 31,000,000 0  
Accrued interest related to uncertain tax positions in other long term liabilities 271,000,000 238,000,000    
Minimum        
Tax Credit Carryforward [Line Items]        
Decrease in unrecognized tax benefits is reasonably possible 400,000,000      
Foreign Country        
Tax Credit Carryforward [Line Items]        
Net operating loss carryforwards 1,000,000,000      
Other Assets        
Tax Credit Carryforward [Line Items]        
Deferred tax assets, net 126,000,000 87,000,000    
Non-current income tax receivable 961,000,000 1,000,000,000    
Non United States Customers        
Tax Credit Carryforward [Line Items]        
US income before taxes $ 4,200,000,000 $ 3,600,000,000 $ 3,100,000,000