v3.22.2.2
Income Taxes - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2022
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Tax Credit Carryforward [Line Items]          
US income before taxes   $ 11,051 $ 11,002 $ 9,178  
Deferred tax assets, net $ 1,167 $ 1,167 $ 1,046    
Effective income tax rate   18.00% 23.00% 21.00%  
Recognized tax benefit 176        
Non-recurring, non-cash tax expense related to the remeasurement of UK deferred tax liabilities   $ 1,000   $ 329  
Effective income tax rate reconciliation, recognized tax benefit   0 $ 255 0  
Income taxes receivable included in prepaid and other current assets 190 190 83    
Income taxes payable included in accrued taxes as part of accrued liabilities 365 365 325    
Accrued income taxes included in other long-term liabilities 2,300 2,300 2,400    
Increase (decrease) in Singapore tax as a result of the tax incentive agreement   $ (362) $ (273) $ (280)  
Benefit of the tax incentive agreement on diluted net income per share (in dollars per share)   $ 0.17 $ 0.12 $ 0.13  
Total unrecognized tax benefits exclusive of interest and penalties 2,683 $ 2,683 $ 2,488 $ 2,579 $ 2,234
Unrecognized tax benefits, if recognized, would reduce the effective tax rate in a future period 1,300 1,300 1,300 1,600  
Interest expense included in interest expense and administrative and other   15 1 68  
Accrued penalties related to uncertain tax positions 31 31 3 4  
Accrued interest related to uncertain tax positions in other long term liabilities 238 238 233    
Accrued penalties related to uncertain tax positions in other long term liabilities 3 3 34    
Foreign Country          
Tax Credit Carryforward [Line Items]          
Net operating loss carryforwards 517 517      
Other Assets          
Tax Credit Carryforward [Line Items]          
Deferred tax assets, net 87 87 80    
Non-current income tax receivable $ 1,000 1,000 974    
Non United States Customers          
Tax Credit Carryforward [Line Items]          
US income before taxes   $ 3,600 $ 3,100 $ 3,000