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CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (Unaudited) - 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):        
Net income $ 153 $ 64 $ 267 $ 158
Unrealized gain (loss) on investments, net of tax benefit of zero, $1, zero and $1 0 0 0 (2)
Unrealized gain (loss) on derivative instruments, net of tax benefit (expense) of zero 0 0 (2) 2
Amounts reclassified into earnings related to derivative instruments, net of tax benefit (expense) of zero 0 (1) 1 (3)
Foreign currency translation, net of tax benefit (expense) of zero (16) (13) 14 28
Net defined benefit pension cost and post retirement plan costs:        
Change in actuarial net loss, net of tax expense of $4, $4, $7 and $7 8 11 21 21
Change in net prior service credit, net of tax benefit of $1, $2, $2 and $3 (4) (4) (7) (8)
Other comprehensive income (loss) (12) (7) 27 38
Total comprehensive income $ 141 $ 57 $ 294 $ 196