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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Sep. 30, 2020
Income Taxes, Additional Information [Line Items]
Effective income tax rate	14.00%	25.00%
Ireland statutory income tax rate	12.50%	12.50%
Gross tax effected unrecognized tax benefits			$ 2,528
Amount of unrecognized tax benefits which may impact effective tax rate			2,132
Total net accrued interest, net of tax benefit			$ 205
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	$ 15	$ 20
Restructuring and impairment costs	$ 0	111
Income Tax Reconciliation, Restructuring and Impairment Charges		16
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount		$ 30

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Income Tax Reconciliation, Restructuring and Impairment Charges

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Amount of unrecognized tax benefits.

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Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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Amount of interest expense accrued for an underpayment of income taxes.

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