Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
Dec. 31, 2023	Dec. 31, 2022
Tax Credit Carryforward [Line Items]
Effective income tax rate reconciliation, percent (in percent)	19.00%	16.00%
Recognized tax benefit		$ 142
Increase in unrecognized tax benefits, gross	$ 113
Increase in unrecognized tax benefits, net	29
Minimum
Tax Credit Carryforward [Line Items]
Decrease in unrecognized tax benefits is reasonably possible	$ 400

Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit.

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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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Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement.

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Unrecognized Tax Benefits, Increase Resulting From Prior Period Tax Positions (Includes Reserve Assessment)

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