CONSOLIDATED STATEMENT OF EQUITY - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income/(Loss) [Member]	Treasury Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury Stock, Shares	(2,289,000)
Beginning Balance at Oct. 31, 2016	$ 1,513	$ 2	$ 1,242	$ 949	$ (618)	$ (62)
Beginning Balance (in shares) at Oct. 31, 2016		172,287,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adjustment due to adoption of new accounting standards	(10)			(10)
Net income	102			102
Other comprehensive income (loss), net of tax	161				161
Share-based awards issued (in shares)		2,880,000
Issuance of common stock	41		41
Stock Issued During Period, Shares, New Issues		13,143,000
Public offering of common stock (Value)	444		444
Share-based compensation	56		56
Tax benefits from share-based awards issued	$ 3		(3)
Treasury Stock, Shares, Acquired	0
Ending Balance at Oct. 31, 2017	$ 2,310	$ 2	1,786	1,041	(457)	$ (62)
Ending Balance (in shares) at Oct. 31, 2017		188,310,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury Stock, Shares	(2,289,000)
Adjustment due to adoption of new accounting standards	$ 6			6
Net income	165			165
Other comprehensive income (loss), net of tax	(31)				(31)
Share-based awards issued (in shares)		2,894,000
Issuance of common stock	44		44
Share-based compensation	$ 59		59
Treasury Stock, Shares, Acquired	(2,075,460)					(2,075,000)
Repurchase of common stock (at cost)	$ (120)					$ (120)
Ending Balance at Oct. 31, 2018	2,433	$ 2	1,889	1,212	(488)	$ (182)
Ending Balance (in shares) at Oct. 31, 2018		191,204,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury Stock, Shares						(4,364,000)
Adjustment due to adoption of new accounting standards	76			76
Net income	621
Other comprehensive income (loss), net of tax	(90)				(90)
Share-based awards issued (in shares)		2,565,000
Issuance of common stock	42		42
Share-based compensation	$ 82		82
Treasury Stock, Shares, Acquired	(2,093,570)					(2,094,000)
Repurchase of common stock (at cost)	$ (160)					$ (160)
Ending Balance at Oct. 31, 2019	$ 3,004	$ 2	$ 2,013	$ 1,909	$ (578)	$ (342)
Ending Balance (in shares) at Oct. 31, 2019		193,769,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury Stock, Shares						(6,458,000)