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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 Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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