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Earnings Per Share - Computation of Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Numerator
Numerator for basic and diluted EPS - Income from continuing operations	$ 38	$ 25	$ 70	$ 68
Denominator
Denominator for basic EPS - Weighted-average common shares outstanding	56	61	57	61
Share based awards convertible to common shares	1	1	1	1
Denominator for diluted EPS - Adjusted weighted-average shares and assumed conversions	57	62	58	62
EPS from continuing operations
Basic	$ 0.67	$ 0.41	$ 1.22	$ 1.11
Diluted	$ 0.66	$ 0.40	$ 1.20	$ 1.10

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Amount after tax of income (loss) from continuing operations attributable to the parent.

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