Stockholders' Deficit - Schedule of Changes and Reclassifications Related to Other Comprehensive Income, Net of Taxes (Details) - USD ($) $ in Millions	3 Months Ended
Jan. 31, 2019	Jan. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized losses arising during the period	$ (92)
(Gains) losses reclassified into earnings	(149)
Other comprehensive loss, net of taxes	(242)	$ (411)
Change in unrealized gains (losses) on available-for-sale securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized losses arising during the period	0	(2)
(Gains) losses reclassified into earnings	0	(5)
Other comprehensive loss, net of taxes	0	(7)
Net unrealized gains (losses) on cash flow hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized losses arising during the period	(87)	(481)
(Gains) losses reclassified into earnings	(157)	67
Other comprehensive loss, net of taxes	(244)	(414)
Tax provision on amortization of actuarial loss and prior service benefit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
(Gains) losses reclassified into earnings	8	9
Settlements and other
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
(Gains) losses reclassified into earnings	(1)	1
Change in unrealized components of defined benefit plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized losses arising during the period	0
(Gains) losses reclassified into earnings	8
Other comprehensive loss, net of taxes	7	10
Change in cumulative translation adjustment
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized losses arising during the period	(5)
(Gains) losses reclassified into earnings	0
Other comprehensive loss, net of taxes	$ (5)	$ 0

Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

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