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CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2019
Oct. 31, 2018
Oct. 31, 2017
Statement of Comprehensive Income [Abstract]      
Net income $ 621 $ 165 $ 102
Other comprehensive income (loss):      
Unrealized gain (loss) on investments, net of tax benefit (expense) of zero, $3 and $(1) 0 (14) 4
Unrealized gain (loss) on derivative instruments, net of tax benefit (expense) of $1, zero and $(2) (4) 0 4
Amounts reclassified into earnings related to derivative instruments, net of tax benefit (expense) of zero, $1 and $(1) 3 (3) 0
Foreign currency translation, net of tax benefit (expense) of zero 17 (21) (10)
Net defined benefit pension cost and post retirement plan costs:      
Change in actuarial net gain (loss), net of tax benefit (expense) of $28, $(7) and $(68) (91) 23 178
Change in net prior service credit, net of tax benefit of $4, $6 and $9 (15) (16) (15)
Other comprehensive income (loss) (90) (31) 161
Total comprehensive income $ 531 $ 134 $ 263