Income Taxes - Components of Income Before Income Taxes and Reconciliation of Statutory Federal Income Tax (Details) - USD ($) $ in Millions	12 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Income before income taxes
United States	$ 483	$ 399	$ 212
Non-U.S.	60	52	53
Income before income taxes	$ 543	$ 451	$ 265
U.S. statutory tax rate	21.00%	21.00%	21.00%
Income taxes computed at U.S. statutory tax rate	$ 114	$ 95	$ 56
(Decrease) increase in amount computed resulting from:
Unrecognized tax benefits	(5)	1	5
State taxes, net of federal benefit	19	16	9
International rate differential	3	2	2
Permanent items	(6)	(4)	(3)
Remeasurement of net deferred taxes	0	1	(4)
Return-to-provision adjustments	0	(2)	(6)
Change in valuation allowances	1	29	(4)
Tax Matters Agreement activity	(6)	(6)	1
Other	3	2	1
Income tax expense	$ 123	$ 134	$ 57
Effective tax rate	22.70%	29.70%	21.50%

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

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The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile.

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

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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 valuation allowance for deferred tax assets.

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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 revisions of previously reported income tax expense (benefit).

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