Stockholders' Deficit - Tax Effects Related to Other Comprehensive Income (Loss) (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
Components of accumulated other comprehensive income, net of taxes
Tax benefit (provision) on other comprehensive income (loss)	$ 3	$ (22)	$ 183	$ (62)	$ (90)	$ (20)	$ 161	$ (110)	$ 164	$ (172)
Tax benefit (provision) on unrealized (losses) gains arising during the period
Components of accumulated other comprehensive income, net of taxes
Tax benefit (provision) on unrealized (losses) gains arising during the period	0			1					(1)	2
Tax effect on change in unrealized components of cash flow hedges
Components of accumulated other comprehensive income, net of taxes
Tax benefit (provision) on unrealized (losses) gains arising during the period	18			(159)					144	(305)
Tax effects on reclassification into earnings	(15)			99					22	135
Tax benefit (provision) on other comprehensive income (loss)	3			(60)					166	(170)
Tax benefit (provision) on gains (losses) arising during the period
Components of accumulated other comprehensive income, net of taxes
Tax benefit (provision) on unrealized (losses) gains arising during the period	0			0					(1)	0
Tax benefit on amortization of actuarial loss and prior service benefit
Components of accumulated other comprehensive income, net of taxes
Tax effects on reclassification into earnings	0			(3)					0	(5)
Tax provision on curtailments, settlements and other
Components of accumulated other comprehensive income, net of taxes
Tax effects on reclassification into earnings	0			0					0	(1)
Tax effects on change in unrealized components of defined benefit plans
Components of accumulated other comprehensive income, net of taxes
Tax benefit (provision) on other comprehensive income (loss)	0			(3)					(1)	(6)
Tax effect on change in cumulative translation adjustment
Components of accumulated other comprehensive income, net of taxes
Tax benefit (provision) on other comprehensive income (loss)	$ 0			$ 0					$ 0	$ 2