CONDENSED CONSOLIDATED STATEMENT OF EQUITY - USD ($) shares in Thousands, $ in Millions	Total	Common Stock	Additional Paid-in Capital	Treasury Stock	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive Loss	Total Stockholder's Equity	Non-controlling Interest	Revision of Prior Period Adjustment, Accounting Standards Update	Revision of Prior Period Adjustment, Accounting Standards Update Retained Earnings (Accumulated Deficit)	Revision of Prior Period Adjustment, Accounting Standards Update Accumulated Other Comprehensive Loss	Revision of Prior Period Adjustment, Accounting Standards Update Total Stockholder's Equity
Beginning Treasury Stock, Shares at Oct. 31, 2018				0
Beginning Treasury Stock, Value at Oct. 31, 2018				$ 0
Beginning Balance (in Shares) at Oct. 31, 2018		317,715
Beginning Balance at Oct. 31, 2018	$ 4,571	$ 3	$ 5,308		$ (336)	$ (408)	$ 4,567	$ 4	$ 26	$ 33	$ (7)	$ 26
Components of comprehensive income, net of tax
Net income	877				877		877
Other comprehensive income (loss)	11					11	11
Total comprehensive income, net of tax	888						888
Purchase of non-controlling interest increase (decrease)	(4)							(4)
Cash dividends declared	(155)				(155)		(155)
Share-based awards issued, net of tax (in shares)		1,652
Share-based awards issued	37		37				37
Repurchase of common stock (in shares)				(9,770)
Treasury Stock, Value, Acquired, Cost Method	(674)			$ (674)			(674)
Retirement of treasury shares (in shares)		(9,770)		(9,770)
Retirement of treasury shares	0	$ 0	(133)	$ (674)	(541)		0
Share-based compensation	58		58				58
Ending Treasury Stock, Shares at Jul. 31, 2019				0
Ending Treasury Stock, Value at Jul. 31, 2019				$ 0
Ending Balance (in Shares) at Jul. 31, 2019		309,597
Ending Balance at Jul. 31, 2019	4,747	$ 3	5,270		(122)	(404)	4,747	0
Beginning Treasury Stock, Shares at Apr. 30, 2019				(9)
Beginning Treasury Stock, Value at Apr. 30, 2019				$ (1)
Beginning Balance (in Shares) at Apr. 30, 2019		317,285
Beginning Balance at Apr. 30, 2019	5,125	$ 3	5,343		178	(398)	5,125	0
Components of comprehensive income, net of tax
Net income	191				191		191
Other comprehensive income (loss)	(6)					(6)	(6)
Total comprehensive income, net of tax	185						185
Cash dividends declared	(51)				(51)		(51)
Share-based awards issued, net of tax (in shares)		325
Share-based awards issued	19		19				19
Repurchase of common stock (in shares)				(8,004)
Treasury Stock, Value, Acquired, Cost Method	(549)			$ (549)			(549)
Retirement of treasury shares (in shares)		(8,013)		(8,013)
Retirement of treasury shares	0	$ 0	(110)	$ (550)	(440)		0
Share-based compensation	18		18				18
Ending Treasury Stock, Shares at Jul. 31, 2019				0
Ending Treasury Stock, Value at Jul. 31, 2019				$ 0
Ending Balance (in Shares) at Jul. 31, 2019		309,597
Ending Balance at Jul. 31, 2019	4,747	$ 3	5,270		(122)	(404)	4,747	0
Beginning Treasury Stock, Shares at Oct. 31, 2019				0
Beginning Treasury Stock, Value at Oct. 31, 2019				$ 0
Beginning Balance (in Shares) at Oct. 31, 2019		309,071
Beginning Balance at Oct. 31, 2019	4,748	$ 3	5,277		(18)	(514)	4,748	0
Components of comprehensive income, net of tax
Net income	497				497		497
Other comprehensive income (loss)	38					38	38
Total comprehensive income, net of tax	535						535
Cash dividends declared	(167)				(167)		(167)
Share-based awards issued, net of tax (in shares)		2,258
Share-based awards issued	21		21				21
Repurchase of common stock (in shares)				(2,751)
Treasury Stock, Value, Acquired, Cost Method	(219)			$ (219)			(219)
Retirement of treasury shares (in shares)		(2,751)		(2,751)
Retirement of treasury shares	0	$ 0	(37)	$ (219)	(182)		0
Share-based compensation	63		63				63
Ending Treasury Stock, Shares at Jul. 31, 2020				0
Ending Treasury Stock, Value at Jul. 31, 2020				$ 0
Ending Balance (in Shares) at Jul. 31, 2020		308,578
Ending Balance at Jul. 31, 2020	4,981	$ 3	5,324		130	(476)	4,981	0
Beginning Treasury Stock, Shares at Apr. 30, 2020				0
Beginning Treasury Stock, Value at Apr. 30, 2020				$ 0
Beginning Balance (in Shares) at Apr. 30, 2020		308,443
Beginning Balance at Apr. 30, 2020	4,768	$ 3	5,288		15	(538)	4,768	0
Components of comprehensive income, net of tax
Net income	199				199		199
Other comprehensive income (loss)	62					62	62
Total comprehensive income, net of tax	261						261
Cash dividends declared	(56)				(56)		(56)
Share-based awards issued, net of tax (in shares)		497
Share-based awards issued	22		22				22
Repurchase of common stock (in shares)				(362)
Treasury Stock, Value, Acquired, Cost Method	(33)			$ (33)			33
Retirement of treasury shares (in shares)		(362)		(362)
Retirement of treasury shares	0	$ 0	(5)	$ (33)	(28)		0
Share-based compensation	19		19				19
Ending Treasury Stock, Shares at Jul. 31, 2020				0
Ending Treasury Stock, Value at Jul. 31, 2020				$ 0
Ending Balance (in Shares) at Jul. 31, 2020		308,578
Ending Balance at Jul. 31, 2020	$ 4,981	$ 3	$ 5,324		$ 130	$ (476)	$ 4,981	$ 0