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CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (Unaudited) (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Apr. 30, 2019
Apr. 30, 2018
Other comprehensive income (loss), tax, parenthetical disclosures [Abstract]        
Unrealized gain (loss) on investments, tax $ 0 $ 1 $ 0 $ 1
Unrealized gain (loss) on derivative instruments, tax 0 0 0 0
Amounts reclassified into earnings related to derivative instruments, tax 0 0 0 0
Foreign currency translation, tax 0 0 0 0
Net defined benefit pension cost and post retirement plan costs, tax [Abstract]        
Change in actuarial net loss, tax 4 4 7 7
Change in net prior service credit, tax $ 1 $ 2 $ 2 $ 3