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Income Taxes - Additional Information (Detail) - USD ($)
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Tax Credit Carryforward [Line Items]        
US income before taxes $ 14,537,000,000 $ 13,339,000,000 $ 11,051,000,000  
Deferred tax assets, net $ 1,641,000,000 $ 1,553,000,000    
Effective income tax rate (in percent) 17.00% 18.00% 18.00%  
Recognized tax benefit $ 223,000,000 $ 142,000,000 $ 176,000,000  
Income taxes receivable included in prepaid and other current assets 832,000,000 206,000,000    
Income taxes payable included in accrued taxes as part of accrued liabilities 577,000,000 1,500,000,000    
Accrued income taxes included in other long-term liabilities 1,400,000,000 1,900,000,000    
Decreased Singapore tax as a result of the tax incentive agreement $ 419,000,000 $ 468,000,000 $ 362,000,000  
Benefit of the tax incentive agreement on diluted net income per share (in dollars per share) $ 0.21 $ 0.22 $ 0.17  
Total unrecognized tax benefits exclusive of interest and penalties $ 3,750,000,000 $ 3,497,000,000 $ 2,683,000,000 $ 2,488,000,000
Unrecognized tax benefits, if recognized, would reduce the effective tax rate in a future period 1,400,000,000 1,600,000,000 1,300,000,000  
Interest expense included in interest expense and administrative and other 29,000,000 34,000,000 15,000,000  
Accrued penalties related to uncertain tax positions 0 0 31,000,000  
Accrued interest related to uncertain tax positions in other long term liabilities 300,000,000 271,000,000    
Foreign Country        
Tax Credit Carryforward [Line Items]        
Net operating loss carryforwards 894,000,000      
Other Assets        
Tax Credit Carryforward [Line Items]        
Deferred tax assets, net 140,000,000 126,000,000    
Non-current income tax receivable 442,000,000 961,000,000    
Non United States Customers        
Tax Credit Carryforward [Line Items]        
US income before taxes $ 5,100,000,000 $ 4,200,000,000 $ 3,600,000,000