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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Sep. 30, 2021
Income Taxes, Additional Information [Line Items]          
Effective income tax rate 52.70% 34.50% 21.50% 26.00%  
Ireland statutory income tax rate 12.50% 12.50% 12.50% 12.50%  
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount   $ 105      
Gross tax effected unrecognized tax benefits         $ 2,726
Amount of unrecognized tax benefits which may impact effective tax rate         2,268
Total net accrued interest, net of tax benefit         $ 252
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense     $ 30 $ 24  
Mark-to-market gain (loss) $ (89) 207 (32) 207  
Mark-to-market gain (loss), tax expense (benefit) (21) 53 (7) 53  
Restructuring and impairment costs 384 96 433 96  
Restructuring charges, tax benefit 7 $ 15 14 $ 15  
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount $ 13   $ 13