Condensed Consolidated Statements of Stockholders' Deficit - USD ($) shares in Millions, $ in Millions	Total	Cumulative Effect, Period of Adoption, Adjustment [Member]	Common stock	Paid-in capital	Retained earnings	Accumulated other comprehensive income (loss)
Common stock outstanding, at beginning of period (shares) at Sep. 30, 2020			185
Balance at beginning of period at Sep. 30, 2020	$ (76)	$ (2)	$ 2	$ 24	$ (110)	$ 8
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	87				87
Dividends paid	(23)				(23)
Stock-based compensation plans	(1)			(1)
Stock Repurchased and Retired During Period, Shares			2
Repurchases of common stock	(58)				(58)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	16					16
Common stock outstanding, at end of period (shares) at Dec. 31, 2020			183
Balance at end of period at Dec. 31, 2020	$ (55)		$ 2	25	(106)	24
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends paid per common share (usd per share)	$ 0.125
Common stock outstanding, at beginning of period (shares) at Sep. 30, 2020			185
Balance at beginning of period at Sep. 30, 2020	$ (76)	$ (2)	$ 2	24	(110)	8
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	252
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	10
Common stock outstanding, at end of period (shares) at Jun. 30, 2021			181
Balance at end of period at Jun. 30, 2021	23		$ 2	32	(29)	18
Common stock outstanding, at beginning of period (shares) at Dec. 31, 2020			183
Balance at beginning of period at Dec. 31, 2020	(55)		$ 2	25	(106)	24
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	68				68
Dividends paid	(23)				(23)
Stock-based compensation plans	(4)			(4)
Stock Repurchased and Retired During Period, Shares			2
Repurchases of common stock	(42)				(42)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(8)					(8)
Common stock outstanding, at end of period (shares) at Mar. 31, 2021			181
Balance at end of period at Mar. 31, 2021	$ (56)		$ 2	29	(103)	16
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends paid per common share (usd per share)	$ 0.125
Net income	$ 97				97
Dividends paid	(23)				(23)
Stock-based compensation plans	(3)			(3)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	2					2
Common stock outstanding, at end of period (shares) at Jun. 30, 2021			181
Balance at end of period at Jun. 30, 2021	$ 23		$ 2	32	(29)	18
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends paid per common share (usd per share)	$ 0.125
Common stock outstanding, at beginning of period (shares) at Sep. 30, 2021	180		180
Balance at beginning of period at Sep. 30, 2021	$ 135		$ 2	35	90	8
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	87				87
Dividends paid	(23)				(23)
Stock-based compensation plans	(2)			(2)
Stock Repurchased and Retired During Period, Shares			0
Repurchases of common stock	(31)				(31)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	1					1
Common stock outstanding, at end of period (shares) at Dec. 31, 2021			180
Balance at end of period at Dec. 31, 2021	$ 167		$ 2	33	123	9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends paid per common share (usd per share)	$ 0.125
Common stock outstanding, at beginning of period (shares) at Sep. 30, 2021	180		180
Balance at beginning of period at Sep. 30, 2021	$ 135		$ 2	35	90	8
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	267
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	$ (11)
Common stock outstanding, at end of period (shares) at Jun. 30, 2022	177		177
Balance at end of period at Jun. 30, 2022	$ 226		$ 2	41	186	(3)
Common stock outstanding, at beginning of period (shares) at Dec. 31, 2021			180
Balance at beginning of period at Dec. 31, 2021	167		$ 2	33	123	9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	81				81
Dividends paid	(22)				(22)
Stock-based compensation plans	(3)			(3)
Stock Repurchased and Retired During Period, Shares			1
Repurchases of common stock	(35)				(35)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	6					6
Common stock outstanding, at end of period (shares) at Mar. 31, 2022			179
Balance at end of period at Mar. 31, 2022	$ 200		$ 2	36	147	15
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends paid per common share (usd per share)	$ 0.125
Net income	$ 99				99
Dividends paid	(22)				(22)
Stock-based compensation plans	5			5
Stock Repurchased and Retired During Period, Shares			2
Repurchases of common stock	(38)				(38)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	$ (18)					(18)
Common stock outstanding, at end of period (shares) at Jun. 30, 2022	177		177
Balance at end of period at Jun. 30, 2022	$ 226		$ 2	$ 41	$ 186	$ (3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends paid per common share (usd per share)	$ 0.125