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Income Taxes - Summary of Changes in Unrecognized Tax Benefits (Details) $ in Millions	6 Months Ended
	Mar. 31, 2025 USD ($)
Income Tax Disclosure [Abstract]
Balance at beginning of period	$ 65
Decreases related to positions taken in prior years	(5)
Increases related to positions taken in the current year	2
Increases related to positions taken in the prior year	1
Balance at end of period	$ 63

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- Definition

Amount of unrecognized tax benefits.

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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