Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2024	Sep. 30, 2023	Mar. 31, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Net Income (Loss) Attributable to Parent	$ 108	$ 108	$ 21	$ 21
Basic (in shares)	72		72
Dilutive effect of employee stock plans	0		0
Diluted (in shares)	72		72
Net income per share, basic (in dollars per share)	$ 1.49		$ 0.29
Net income per share, diluted (in dollars per share)	$ 1.48		$ 0.29