Condensed Combined Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended
	Jan. 31, 2017	Jan. 31, 2016
Statement of Comprehensive Income [Abstract]
Net loss	$ (37)	$ (178)
Change in net unrealized losses on available-for-sale securities:
Net unrealized losses arising during the period	(11)	(7)
Change in net unrealized losses on available-for-sale securities, total	(11)	(7)
Change in net unrealized (losses) gains on cash flow hedges:
Net unrealized gains arising during the period	5	46
Net gains reclassified into earnings	(24)	(21)
Change in net unrealized gains on cash flow hedges, total	(19)	25
Change in unrealized components of defined benefit plans:
Gains arising during the period	116
Amortization of actuarial loss and prior service benefit	26	23
Plans transferred to Parent during the period	361
Plans transferred from Parent during the period	(369)
Change in unrealized components of defined benefit plans, total	134	23
Change in cumulative translation adjustment	(2)	(5)
Other comprehensive income before taxes	102	36
Benefit for taxes	27	4
Other comprehensive income, net of taxes	129	40
Comprehensive income (loss)	$ 92	$ (138)