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Stockholders' Deficit - Changes and Reclassifications Related to Other Comprehensive Income, Net of Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized (losses) gains arising during the period			$ (287)
Losses (gains) reclassified into earnings			209
Other comprehensive income (loss), net of taxes	$ 153	$ 158	(77)	$ 175
Change in unrealized gains (losses) on available-for-sale securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized (losses) gains arising during the period	0	(2)	3	(1)
Losses (gains) reclassified into earnings			0
Net unrealized (losses) gains on cash flow hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized (losses) gains arising during the period	(28)	198	(347)	242
Losses (gains) reclassified into earnings	132	(37)	177	(86)
Other comprehensive income (loss), net of taxes	104	161	(170)	156
Tax provision on gains arising during the period
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized (losses) gains arising during the period	31	(1)	30	(1)
Tax benefit on amortization of actuarial loss and prior service benefit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Losses (gains) reclassified into earnings	16	16	32	31
Curtailments, settlements and other
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Losses (gains) reclassified into earnings	0	1	1	1
Change in unrealized components of defined benefit plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized (losses) gains arising during the period			30
Losses (gains) reclassified into earnings			32
Other comprehensive income (loss), net of taxes	47	16	63	31
Change in cumulative translation adjustment
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized (losses) gains arising during the period			27
Losses (gains) reclassified into earnings			0
Change in cumulative translation adjustment	$ 2	$ (17)	$ 27	$ (11)

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

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