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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Sep. 30, 2022
Income Tax Examination [Line Items]          
Effective income tax rate 41.50% 12.10% 22.40% 17.20%  
Gross tax effected unrecognized tax benefits         $ 2,537
Amount of unrecognized tax benefits which may impact effective tax rate         1,973
Total net accrued interest, net of tax benefit         $ 284
Unrecognized tax benefits, income tax penalties and interest expense     $ 33 $ 40  
Unrecognized tax benefits, period decrease $ 438        
Restructuring and impairment costs 81 $ 121 844 554  
Restructuring charges, tax benefit $ 11 $ 15 $ 98 $ 29  
IRELAND          
Income Tax Examination [Line Items]          
Ireland statutory income tax rate 12.50% 12.50% 12.50% 12.50%