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CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2020
Oct. 31, 2019
Oct. 31, 2018
Statement of Comprehensive Income [Abstract]      
Net income $ 627 $ 621 $ 165
Other comprehensive income (loss):      
Unrealized gain (loss) on investments, net of tax benefit (expense) of zero, zero and $3 0 0 (14)
Unrealized gain (loss) on derivative instruments, net of tax benefit (expense) of $(4), $1 and zero 16 (4) 0
Amounts reclassified into earnings related to derivative instruments, net of tax benefit (expense) of $(1), zero and $1 3 3 (3)
Foreign currency translation, net of tax benefit (expense) of zero 33 17 (21)
Net defined benefit pension cost and post retirement plan costs:      
Change in actuarial net gain (loss), net of tax benefit (expense) of $23, $28 and $(7) (64) (91) 23
Change in net prior service credit, net of tax benefit of $3, $4 and $6 (9) (15) (16)
Other comprehensive loss (21) (90) (31)
Total comprehensive income $ 606 $ 531 $ 134