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CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Oct. 31, 2020
Oct. 31, 2019
Oct. 31, 2018
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent, Parenthetical Disclosures [Abstract]      
Unrealized gain (loss) on investments, tax benefit (expense) $ 0 $ 0 $ 3
Unrealized gain (loss) on derivative instruments, tax benefit (expense) (4) 1 0
Amounts reclassified into earnings related to derivative instruments, tax benefit (expense) (1) 0 1
Foreign currency translation, tax benefit (expense) 0 0 0
Change in actuarial net loss, tax benefit (expense) 23 28 (7)
Change in net prior service credit, net of tax benefit $ 3 $ 4 $ 6