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Stockholders' Deficit - Changes and Reclassifications Related to Other Comprehensive Income (Loss), Net of Taxes (Details) - USD ($) $ in Millions	3 Months Ended						6 Months Ended		9 Months Ended
	Jul. 31, 2023	Apr. 30, 2023	Jan. 31, 2023	Jul. 31, 2022	Apr. 30, 2022	Jan. 31, 2022	Apr. 30, 2023	Apr. 30, 2022	Jul. 31, 2023	Jul. 31, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized gains (losses) arising during the period									$ (557)
(Gains) losses reclassified into earnings									(82)
Other comprehensive income (loss), net of taxes	$ 14	$ 88	$ (741)	$ (110)	$ 363	$ 230	$ (653)	$ 593	(639)	$ 483
Unrealized gains (losses) arising during the period
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized gains (losses) arising during the period	1			0					4	(5)
(Gains) losses reclassified into earnings									0
Change in unrealized components of cash flow hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized gains (losses) arising during the period	(50)			121					(613)	877
(Gains) losses reclassified into earnings	53			(228)					(82)	(356)
Other comprehensive income (loss), net of taxes	3			(107)					(695)	521
Gains (losses) arising during the period
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized gains (losses) arising during the period	0			10					4	12
Amortization of actuarial loss and prior service benefit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
(Gains) losses reclassified into earnings	0			2					0	11
Curtailments, settlements and other
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
(Gains) losses reclassified into earnings	0			(1)					0	(2)
Change in unrealized components of defined benefit plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized gains (losses) arising during the period									4
(Gains) losses reclassified into earnings									0
Other comprehensive income (loss), net of taxes	0			11					4	21
Change in cumulative translation adjustment
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized gains (losses) arising during the period									48
(Gains) losses reclassified into earnings									0
Change in cumulative translation adjustment	$ 10			$ (14)					$ 48	$ (54)