Stockholders' Deficit - Schedule of Taxes Related to Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Apr. 30, 2025	Jan. 31, 2025	Apr. 30, 2024	Jan. 31, 2024	Apr. 30, 2025	Apr. 30, 2024
Components of accumulated other comprehensive income, net of taxes
Balance at the beginning of period	$ (1,072)	$ (1,323)	$ (1,640)	$ (1,069)	$ (1,323)	$ (1,069)
Tax effects on change in unrealized components	165		(40)		110	30
Other comprehensive (loss) income, net of taxes	(639)	230	126	(235)	(409)	(109)
Balance at the end of period	(1,276)	(1,072)	(916)	(1,640)	(1,276)	(916)
Unrealized components of available-for-sale debt securities
Components of accumulated other comprehensive income, net of taxes
Balance at the beginning of period	18	14	11	7	14	7
Unrealized (losses) gains arising during the period	2		0		6	4
Other comprehensive (loss) income, net of taxes	2		0		6	4
Balance at the end of period	20	18	11	11	20	11
Unrealized components of cash flow hedges
Components of accumulated other comprehensive income, net of taxes
Balance at the beginning of period	282	47	(23)	230	47	230
Unrealized (losses) gains arising during the period	(692)		151		(360)	(11)
Gains reclassified into earnings	(148)		(5)		(191)	(164)
Tax effects on change in unrealized components	165		(34)		111	34
Other comprehensive (loss) income, net of taxes	(675)		112		(440)	(141)
Balance at the end of period	(393)	282	89	(23)	(393)	89
Unrealized components of defined benefit plans
Components of accumulated other comprehensive income, net of taxes
Balance at the beginning of period	(492)	(496)	(443)	(437)	(496)	(437)
Unrealized (losses) gains arising during the period	(2)		23		(1)	13
Tax effects on change in unrealized components	0		(6)		(1)	(4)
Other comprehensive (loss) income, net of taxes	4		20		8	14
Balance at the end of period	(488)	(492)	(423)	(443)	(488)	(423)
Amortization of actuarial loss and prior service benefit
Components of accumulated other comprehensive income, net of taxes
Gains reclassified into earnings	5		2		10	4
Curtailments, settlements and other
Components of accumulated other comprehensive income, net of taxes
Gains reclassified into earnings	1		1		0	1
Cumulative translation adjustment
Components of accumulated other comprehensive income, net of taxes
Balance at the beginning of period	(12)	1	(3)	(23)	1	(23)
Unrealized (losses) gains arising during the period	30		(6)		17	14
Other comprehensive (loss) income, net of taxes	30		(6)		17	14
Balance at the end of period	18	(12)	(9)	(3)	18	(9)
Accumulated other comprehensive loss
Components of accumulated other comprehensive income, net of taxes
Balance at the beginning of period	(204)	(434)	(458)	(223)	(434)	(223)
Other comprehensive (loss) income, net of taxes	(639)	230	126	(235)
Balance at the end of period	$ (843)	$ (204)	$ (332)	$ (458)	$ (843)	$ (332)