Stockholders' Deficit - Schedule of Changes and Reclassifications Related to Other Comprehensive Income, Net of Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gains (losses) arising during the period			$ (226)
Reclassifications of (gains) losses into earnings			(50)
Other comprehensive loss, net of taxes	$ (45)	$ (144)	(276)	$ (45)
Change in unrealized gains (losses) on available-for-sale securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gains (losses) arising during the period	1	1	3	1
Reclassifications of (gains) losses into earnings			0
Change in unrealized components of cash flow hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gains (losses) arising during the period	(60)	(105)	(232)	11
Reclassifications of (gains) losses into earnings	(9)	(47)	(76)	(73)
Other comprehensive loss, net of taxes	(69)	(152)	(308)	(62)
Gains (losses) arising during the period
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gains (losses) arising during the period	9	(2)	9	(2)
Tax provision on amortization of actuarial loss and prior service benefit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications of (gains) losses into earnings	12	9	26	18
Settlements and other
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications of (gains) losses into earnings	2	0	(6)	0
Change in unrealized components of defined benefit plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gains (losses) arising during the period			3
Reclassifications of (gains) losses into earnings			26
Other comprehensive loss, net of taxes	$ 23	$ 7	$ 29	$ 16