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COMBINED AND CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Oct. 31, 2015
Oct. 31, 2014
Oct. 31, 2013
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]      
Unrealized gain on investments, tax expense $ 2 $ 4 $ 3
Unrealized gain (loss) on derivative instruments, tax benefit (expense) 5 (2) 0
Amounts reclassified into earnings related to derivative instruments, tax benefit (expense) 0 0 0
Foreign currency translation, tax benefit (expense) 0 1 (6)
Change in actuarial net loss, tax benefit 25 13 0
Change in net prior service credit, tax benefit $ 11 $ 3 $ 0