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CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (Unaudited) (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jul. 31, 2016
Jul. 31, 2015
Jul. 31, 2016
Jul. 31, 2015
Other comprehensive income (loss), tax, parenthetical disclosures [Abstract]        
Unrealized gain (loss) on investments, tax $ 1 $ (2) $ 2 $ (3)
Unrealized gain (loss) on derivative instruments, tax 2 1 2 2
Amounts reclassified into earnings related to derivative instruments, tax (1) 0 (3) 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 (5) (4) (15) (10)
Change in net prior service benefit, tax $ 2 $ 3 $ 7 $ 9