Other Comprehensive Income - Components of Accumulated Other Comprehensive Loss, Net of Taxes (Detail) - USD ($) $ in Millions		3 Months Ended
		Jan. 31, 2017	Jan. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period		$ (2,613)
Other comprehensive (loss) income before reclassifications		101
Plans transferred to Parent during the period		349
Plans transferred from Parent during the period		(321)
Balance at end of period		(2,484)
Net Unrealized Gains (Losses) on Available-for-sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period		20
Other comprehensive (loss) income before reclassifications		(11)	$ (6)
Balance at end of period		9
Net Unrealized Gains (Losses) on Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period		41
Other comprehensive (loss) income before reclassifications		4	49
Reclassifications of (gains) losses into earnings	[1]	(24)	$ (19)
Balance at end of period		21
Unrealized Components of Defined Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period		(1,970)
Other comprehensive (loss) income before reclassifications		110
Reclassifications of (gains) losses into earnings		24
Plans transferred to Parent during the period		349
Plans transferred from Parent during the period		(321)
Balance at end of period		(1,808)
Cumulative Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period		(704)
Other comprehensive (loss) income before reclassifications		(2)
Balance at end of period		$ (706)

[1] Reclassification of pre-tax net (losses) gains on cash flow hedges into the Condensed Combined Statements of Operations was as follows: Three months ended January 31 2017 2016 In millions Net revenue $ (23 ) $ (20 ) Cost of revenue (1 ) (1 ) $ (24 ) $ (21 )