Earnings Per Share - Computation of Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Numerator
Numerator for basic and diluted EPS - Income from continuing operations	$ 51	$ 72	$ 121	$ 139
Denominator
Denominator for basic EPS - Weighted-average common shares outstanding	54	61	56	61
Share based awards convertible to common shares	1	1	1	1
Denominator for diluted EPS - Adjusted weighted-average shares and assumed conversions	55	62	57	62
EPS from continuing operations
Basic	$ 0.94	$ 1.18	$ 2.16	$ 2.29
Diluted	$ 0.93	$ 1.17	$ 2.12	$ 2.27