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SHORT-TERM DEBT - Credit Facility and Commercial Paper (Details) - USD ($) $ in Millions |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 23, 2019 | Mar. 13, 2019 | Oct. 31, 2020 | Oct. 31, 2019 | Oct. 31, 2018 | May 26, 2020 | Oct. 21, 2019 | Aug. 07, 2019
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |
Short-term Debt |  |  | $ 798 | $ 805 | $ 483 |  |  |
Repayments |  |  | 1,413 | $ 702 | $ 693 |  |  |
5 yr unsecured credit facility | Line of Credit |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |
Credit facility initiation date |  | Mar. 13, 2019 |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 1,000 |  |  |  |  |
Short-term debt terms (years) |  |  | five |  |  |  |  |
Short-term Debt |  |  | $ 798 |  |  |  |  |
Repayments |  |  | 913 |  |  |  |  |
Line of credit facility expiration date |  | Mar. 13, 2024 |  |  |  |  |  |
Outstanding balance |  |  | 0 |  |  |  |  |
Short-term Loan Facility | Line of Credit |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  | $ 500
Amount borrowed | $ 500 |  |  |  |  |  |  |
Repayments |  |  | 500 |  |  |  |  |
Additional Incremental Term Loan Facility | Line of Credit |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | $ 500 |
Outstanding balance |  |  | 0 |  |  |  |  |
Commercial Paper | Line of Credit |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | $ 1,000 |  |
Outstanding balance |  |  | $ 75 |  |  |  |  |
Short-term Debt, Weighted Average Interest Rate, at Point in Time |  |  | 0.17% |  |  |  |  |
weighted average maturity date at a point in time |  |  | 5 days |  |  |  |  |

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- Definition Description of the short-term debt arrangement, and disclosures pertaining to the underlying arrangements, including repayment terms, interest rates, restrictions on assets and activities, debt covenants, and other matters important to users of the financial statements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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