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LONG-TERM DEBT - Senior Notes (Details) - USD ($) $ in Millions | Sep. 05, 2019 | Sep. 15, 2016 | Jun. 18, 2013 | Sep. 10, 2012 | Jul. 13, 2010 | Oct. 31, 2019 | Aug. 01, 2019 | Oct. 31, 2018 | Jul. 01, 2012 | Aug. 09, 2011
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument Net Discount Premium Amount |  |  |  |  |  | $ 1,786 |  | $ 1,792 |  |
Senior Notes 2020 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument Net Discount Premium Amount |  |  |  |  |  |  |  | 499 |  |
Issuance date of debt |  |  |  |  | Jul. 13, 2010 |  |  |  |  |
Aggregate face amount of debt |  |  |  |  | $ 500 |  |  |  |  | $ 500
Issue rate percentage of principal amount |  |  |  |  | 99.54% |  |  |  |  |
Maturity date |  |  |  |  | Jul. 15, 2020 |  |  |  |  |
Fixed interest rate per annum (in hundredths) |  |  |  |  | 5.00% |  |  |  |  |
Senior Notes 2022 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument Net Discount Premium Amount |  |  |  |  |  | 399 |  | 399 |  |
Issuance date of debt |  |  |  | Sep. 10, 2012 |  |  |  |  |  |
Aggregate face amount of debt |  |  |  | $ 400 |  |  |  |  |  |
Issue rate percentage of principal amount |  |  |  | 99.80% |  |  |  |  |  |
Maturity date |  |  |  | Oct. 01, 2022 |  |  |  |  |  |
Fixed interest rate per annum (in hundredths) |  |  |  | 3.20% |  |  |  |  |  |
Interest payment frequency |  |  |  | semi-annually |  |  |  |  |  |
Date payments commenced |  |  |  | Apr. 01, 2013 |  |  |  |  |  |
Senior Notes 2023 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument Net Discount Premium Amount |  |  |  |  |  | 597 |  | 597 |  |
Issuance date of debt |  |  | Jun. 18, 2013 |  |  |  |  |  |  |
Aggregate face amount of debt |  |  | $ 600 |  |  |  |  |  |  |
Issue rate percentage of principal amount |  |  | 99.544% |  |  |  |  |  |  |
Maturity date |  |  | Jul. 15, 2023 |  |  |  |  |  |  |
Fixed interest rate per annum (in hundredths) |  |  | 3.875% |  |  |  |  |  |  |
Interest payment frequency |  |  | semi-annually |  |  |  |  |  |  |
Date payments commenced |  |  | Jan. 15, 2014 |  |  |  |  |  |  |
Senior Notes 2026 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument Net Discount Premium Amount |  |  |  |  |  | 298 |  | 297 |  |
Issuance date of debt |  | Sep. 15, 2016 |  |  |  |  |  |  |  |
Aggregate face amount of debt |  | $ 300 |  |  |  |  |  |  |  |
Issue rate percentage of principal amount |  | 99.624% |  |  |  |  |  |  |  |
Maturity date |  | Sep. 22, 2026 |  |  |  |  |  |  |  |
Fixed interest rate per annum (in hundredths) |  | 3.05% |  |  |  |  |  |  |  |
Interest payment frequency |  | semi-annually |  |  |  |  |  |  |  |
Date payments commenced |  | Mar. 22, 2017 |  |  |  |  |  |  |  |
Senior Notes 2029 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument Net Discount Premium Amount |  |  |  |  |  | 492 |  | $ 0 |  |
Issuance date of debt | Sep. 05, 2019 |  |  |  |  |  |  |  |  |
Aggregate face amount of debt | $ 500 |  |  |  |  |  |  |  |  |
Issue rate percentage of principal amount | 99.316% |  |  |  |  |  |  |  |  |
Maturity date | Sep. 15, 2029 |  |  |  |  |  |  |  |  |
Fixed interest rate per annum (in hundredths) | 2.75% |  |  |  |  |  |  |  |  |
Interest payment frequency | semi-annually |  |  |  |  |  |  |  |  |
Date payments commenced | Mar. 15, 2020 |  |  |  |  |  |  |  |  |
Treasury Lock [Member] | Senior Notes 2029 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  |  |  | $ 250 |  |  |
Remaining gain loss to be amortized on derivative |  |  |  |  |  | 6 |  |  |  |
Treasury Lock [Member] | Senior Notes 2022 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  |  |  |  |  | $ 400 |
Remaining gain loss to be amortized on derivative |  |  |  |  |  | $ 1 |  |  |  |

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