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COMBINED AND CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2015
Oct. 31, 2014
Oct. 31, 2013
Statement of Comprehensive Income [Abstract]      
Net income $ 513 $ 392 $ 457
Other comprehensive income (loss):      
Unrealized gain on investments, net of tax expense of $2, $4 and $3 5 8 5
Unrealized gain (loss) on derivative instruments, net of tax benefit (expense) of $5, $(2) and zero (10) 3 0
Amounts reclassified into earnings related to derivative instruments, net of tax benefit (expense) of zero 1 0 0
Foreign currency translation, net of tax benefit (expense) of zero, $1 and $(6) (54) (72) (75)
Net defined benefit pension cost and post retirement plan costs:      
Change in actuarial net loss, net of tax benefit of $25, $13 and zero (67) (38) 0
Change in net prior service credit, net of tax benefit of $11, $3 and zero (18) (5) 0
Other comprehensive loss (143) (104) (70)
Total comprehensive income $ 370 $ 288 $ 387