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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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 increase (decrease) in the income tax rates.

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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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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

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Income Taxes (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
Income Taxes (Details) - USD ($) $ in Millions	Jan. 01, 2024	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Sep. 30, 2024
Income Tax Examination [Line Items]
Effective income tax rate		12.30%	17.00%	9.90%	0.10%
Gross tax effected unrecognized tax benefits						$ 2,100
Amount of unrecognized tax benefits which may impact effective tax rate						1,500
Total net accrued interest, net of tax benefit						$ 398
Unrecognized tax benefits, income tax penalties and interest expense				$ 64	$ 90
Valuation allowance adjustment				$ 36
IRELAND
Income Tax Examination [Line Items]
Ireland statutory income tax rate		12.50%	12.50%	12.50%	12.50%
SWITZERLAND
Income Tax Examination [Line Items]
Ireland statutory income tax rate	15.00%
Noncash discrete net tax benefit				$ 80