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INCOME TAXES - Current and long-term income tax assets and liabilities (Details) - USD ($)
$ in Millions
Oct. 31, 2019
Oct. 31, 2018
Income Tax Disclosure [Abstract]    
Current income tax assets (included within other current assets) $ 68 $ 59
Long-term income tax assets (included within other assets) 4 19
Current income tax liabilities (included within other accrued liabilities) 292 71
Long-term income tax liabilities (included within other long-term liabilities) 328 607
Total $ 548 $ 600