CONDENSED CONSOLIDATED STATEMENT OF EQUITY - USD ($) shares in Thousands, $ in Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive Loss	Total Stockholder's Equity
Beginning Balance (in Shares) at Oct. 31, 2019		309,071
Beginning Balance at Oct. 31, 2019		$ 3	$ 5,277	$ (18)	$ (514)	$ 4,748
Components of comprehensive income, net of tax
Net income	$ 298			298		298
Other comprehensive income (loss)	(24)				(24)	(24)
Total comprehensive income, net of tax						274
Aggregate Dividends declared (Cash)				111		111
Share-based awards issued, net of tax (in shares)		1,761
Share-based awards issued			(1)			(1)
Stock Repurchased and Retired During Period, Shares		(2,389)
Stock Repurchased and Retired During Period, Value			(32)	(154)		(186)
Share-based compensation			44			44
Ending Balance (in Shares) at Apr. 30, 2020		308,443
Ending Balance at Apr. 30, 2020		$ 3	5,288	15	(538)	4,768
Beginning Balance (in Shares) at Jan. 31, 2020		310,048
Beginning Balance at Jan. 31, 2020		$ 3	5,293	73	(521)	4,848
Components of comprehensive income, net of tax
Net income	101			101		101
Other comprehensive income (loss)	(17)				(17)	(17)
Total comprehensive income, net of tax						84
Aggregate Dividends declared (Cash)				55		55
Share-based awards issued, net of tax (in shares)		58
Share-based awards issued			0			0
Stock Repurchased and Retired During Period, Shares		(1,663)
Stock Repurchased and Retired During Period, Value			(22)	(104)		(126)
Share-based compensation			17			17
Ending Balance (in Shares) at Apr. 30, 2020		308,443
Ending Balance at Apr. 30, 2020		$ 3	5,288	15	(538)	4,768
Beginning Balance (in Shares) at Oct. 31, 2020		306,198
Beginning Balance at Oct. 31, 2020		$ 3	5,311	81	(522)	4,873
Components of comprehensive income, net of tax
Net income	504			504		504
Other comprehensive income (loss)	70				70	70
Total comprehensive income, net of tax						574
Aggregate Dividends declared (Cash)				118		118
Share-based awards issued, net of tax (in shares)		1,643
Share-based awards issued			(46)			(46)
Stock Repurchased and Retired During Period, Shares		(4,438)
Stock Repurchased and Retired During Period, Value			(60)	(479)		(539)
Share-based compensation			66			66
Ending Balance (in Shares) at Apr. 30, 2021		303,403
Ending Balance at Apr. 30, 2021		$ 3	5,271	(12)	(452)	4,810
Beginning Balance (in Shares) at Jan. 31, 2021		304,905
Beginning Balance at Jan. 31, 2021		$ 3	5,266	4	(469)	4,804
Components of comprehensive income, net of tax
Net income	216			216		216
Other comprehensive income (loss)	$ 17				17	17
Total comprehensive income, net of tax						233
Aggregate Dividends declared (Cash)				59		59
Share-based awards issued, net of tax (in shares)		51
Share-based awards issued			1			1
Stock Repurchased and Retired During Period, Shares		(1,553)
Stock Repurchased and Retired During Period, Value			(22)	(173)		(195)
Share-based compensation			26			26
Ending Balance (in Shares) at Apr. 30, 2021		303,403
Ending Balance at Apr. 30, 2021		$ 3	$ 5,271	$ (12)	$ (452)	$ 4,810