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, 2020	Apr. 30, 2019	Apr. 30, 2020	Apr. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized losses arising during the period			$ 229
(Gains) losses reclassified into earnings			(55)
Other comprehensive income (loss), net of taxes	$ 158	$ 187	175	$ (55)
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	(2)	0	(1)	0
(Gains) losses reclassified into earnings	0	3	0	3
Other comprehensive income (loss), net of taxes	(2)	3	(1)	3
Net unrealized gains (losses) on cash flow hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized losses arising during the period	198		242
(Gains) losses reclassified into earnings	(37)		(86)
Other comprehensive income (loss), net of taxes	161		156
Net unrealized gains (losses) on cash flow hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized losses arising during the period		162		75
(Gains) losses reclassified into earnings		4		(153)
Other comprehensive income (loss), net of taxes		166		(78)
Tax benefit on losses arising during the period
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized losses arising during the period	(1)	(3)	(1)	(3)
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	16	9	31	17
Curtailments, settlements and other
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
(Gains) losses reclassified into earnings	1	1	1	0
Change in unrealized components of defined benefit plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized losses arising during the period			(1)
(Gains) losses reclassified into earnings			31
Other comprehensive income (loss), net of taxes	16	7	31	14
Change in cumulative translation adjustment
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized losses arising during the period			(11)
(Gains) losses reclassified into earnings			0
Change in cumulative translation adjustment	$ (17)	$ 11	$ (11)	$ 6