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STOCKHOLDERS' EQUITY STOCKHOLDES' EQUITY - Stock Repurchase (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018	Mar. 16, 2018	Oct. 31, 2016
Treasury Stock Transactions, Excluding Value of Shares Reissued [Abstract]
Stock Repurchase Program, Authorized Amount					$ 350	$ 200
Treasury Stock, Shares, Acquired			1,030,120	773,352
Treasury Stock, Value, Acquired, Cost Method	$ 30	$ 40	$ 70	$ 40
Unsettled treasury repurchase trade	$ 1	$ 12	$ 1	$ 12

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- Definition

Unsettled treasury repurchase trade

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Amount of stock repurchase plan authorized.

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Number of shares that have been repurchased during the period and are being held in treasury.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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