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SHARE-BASED COMPENSATION General Disclosures (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018
Employee stock purchase plan [Abstract]
Compensation percentage maximum eligible contribution to purchase shares of common stock	10.00%
ESPP eligible employee common stock purchase price ratio	85.00%
Maximum number of shares authorized for issuance under the ESPP (in shares)	31,000,000
Number of shares purchased under ESPP (in shares)	628,644	603,488	558,116
Aggregate Value stock issued under Employee Stock Purchase Plan	$ 41	$ 37	$ 32
Aggregate participants contributions to ESPP	$ 22
Incentive compensation plans [Abstract]
Term of the 2018 Stock Plan (in years)	ten years
Common stock available for future awards under the 2018 Stock Plan (in shares)	25,596,430
Maximum contractual term (in years)	ten years
Percentage market value of the common stock option exercise price is generally not less than (in hundredths)	100.00%
Minimum final share award percentage of the target award based on performance metrics (in hundredths)	0.00%
Maximum final share award percentage of the target award based on performance metrics (in hundredths)	200.00%
Time period after which participants of the performance stock award plan are entitled to receive unrestricted share of the company's stock, if specified performance targets are met	three years
Employee Stock Purchase Plan
Incentive compensation plans [Abstract]
Common stock available for future awards under the 2018 Stock Plan (in shares)	25,770,573
Share-based Payment Arrangement, Option
Incentive compensation plans [Abstract]
Percentage which rate options generally vest per year (in hundredths)	25.00%
Number of years from the date of grant generally vest (in years)	4 years
Restricted Stock Units (RSUs)
Incentive compensation plans [Abstract]
Percentage which rate options generally vest per year (in hundredths)	25.00%
Number of years from the date of grant generally vest (in years)	4 years

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Aggregate participant contributions to employee stock purchase plan for the purchase of shares of the company's common stock not yet issued to participants at the end of the period. Shares are excluded from the available for issuance balance at the end of the period.

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Employee stock purchase plan [Abstract]

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Reflects the duration as to when the share-based award expires as specified in the award agreement, which may be presented in a variety of ways (for example, in years, months, quarter of a year).

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An entity may opt to disclose the percent of market value on offering date that participants pay for options granted.

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Description of pertinent provisions of share based compensation awards that have actual or potential impact upon the company's financial statements.

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The maximum payout range for participants of the original target grant based upon the company's attainments of pre-established operating ratio targets.

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Description of the period of time over which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, which may be expressed in a variety of ways (for example, in years, month and year).

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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Number of shares authorized for issuance under share-based payment arrangement.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Purchase price of common stock expressed as a percentage of its fair value.

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