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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Sep. 30, 2021
Income Taxes, Additional Information [Line Items] |  |  |  |  |
Effective income tax rate | 12.10% | 14.00% | 17.20% | 20.90% |
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 |  |  | $ 40 | $ 37 |
Mark-to-market gain (loss) | $ (126) | 66 | (158) | 296 |
Mark-to-market gain (loss), tax expense (benefit) | (33) | 17 | (40) | 75 |
Restructuring and impairment costs | 121 | 79 | 554 | 175 |
Restructuring charges, tax benefit | 15 | $ 15 | 29 | $ 30 |
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount | 8 |  | 21 |  |
Business Acquisition, Transaction Costs | 9 |  | 9 |  |
Business Acquisition, Transaction Costs, Tax | $ 1 |  | $ 1 |  |

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