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, 2022	Apr. 30, 2021	Apr. 30, 2022	Apr. 30, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized (losses) gains arising during the period			$ 727
Losses (gains) reclassified into earnings			(119)
Other comprehensive income (loss), net of taxes	$ 363	$ 153	607	$ (77)
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	(3)	0	(5)	3
Losses (gains) reclassified into earnings			0
Net unrealized gains (losses) on cash flow hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized (losses) gains arising during the period	489	(28)	756	(347)
Losses (gains) reclassified into earnings	(96)	132	(128)	177
Other comprehensive income (loss), net of taxes	393	104	628	(170)
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	1	31	16	30
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	4	16	9	32
Curtailments, settlements and other
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Losses (gains) reclassified into earnings	(1)	0	(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			16
Losses (gains) reclassified into earnings			9
Other comprehensive income (loss), net of taxes	4	47	24	63
Change in cumulative translation adjustment
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized (losses) gains arising during the period			(40)
Losses (gains) reclassified into earnings			0
Change in cumulative translation adjustment	$ (31)	$ 2	$ (40)	$ 27

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

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