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STOCKHOLDERS' EQUITY - Stock Repurchase Program (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Apr. 30, 2018 | Apr. 30, 2017 | Apr. 30, 2018 | Apr. 30, 2017 | May 28, 2015
Share repurchase program |  |  |  |  |
Aggregate cost of shares repurchased |  |  | $ 93 | $ 194 |
Treasury Stock Retired |  |  |  |  |
Number of treasury shares retired (is shares) | 711,000 | 1,600,000 | 1,300,000 | 4,100,000 |
Aggregate cost of treasury shares retired | $ 49 | $ 83 | $ 93 | $ 194 |
2015 Repurchase Program |  |  |  |  |
Share repurchase program |  |  |  |  |
Share repurchase program authorized amount |  |  |  |  | $ 1,140
Shares repurchased (in shares) | 674,000 | 1,600,000 | 1,300,000 | 4,100,000 |
Aggregate cost of shares repurchased | $ 46 | $ 83 | $ 93 | $ 194 |
Remaining authorized repurchase amount under share repurchase program | $ 517 |  | $ 517 |  |

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- Definition Amount of decrease of par value, additional paid in capital (APIC) and retained earnings of common and preferred stock retired from treasury when treasury stock is accounted for under the cost method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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