Stockholders' Deficit - Schedule of Taxes Related to Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Jul. 31, 2025	Apr. 30, 2025	Jan. 31, 2025	Jul. 31, 2024	Apr. 30, 2024	Jan. 31, 2024	Jul. 31, 2025	Jul. 31, 2024
Components of accumulated other comprehensive income, net of taxes
Balance at the beginning of period	$ (1,276)	$ (1,072)	$ (1,323)	$ (916)	$ (1,640)	$ (1,069)	$ (1,323)	$ (1,069)
Tax effects on change in unrealized components	(63)			24			47	54
Other comprehensive income (loss), net of taxes	202	(639)	230	(83)	126	(235)	(207)	(192)
Balance at the end of period	(901)	(1,276)	(1,072)	(1,392)	(916)	(1,640)	(901)	(1,392)
Unrealized components of available-for-sale debt securities
Components of accumulated other comprehensive income, net of taxes
Balance at the beginning of period	20		14	11		7	14	7
Unrealized gains (losses) arising during the period	5			3			11	7
Tax effects on change in unrealized components of available-for-sale securities	(1)			(1)			(1)	(1)
Other comprehensive income (loss), net of taxes	4			2			10	6
Balance at the end of period	24	20		13	11		24	13
Unrealized components of cash flow hedges
Components of accumulated other comprehensive income, net of taxes
Balance at the beginning of period	(393)		47	89		230	47	230
Unrealized gains (losses) arising during the period	59			(36)			(301)	(47)
Losses (gains) reclassified into earnings	202			(87)			11	(251)
Tax effects on change in unrealized components	(61)			27			50	61
Other comprehensive income (loss), net of taxes	200			(96)			(240)	(237)
Balance at the end of period	(193)	(393)		(7)	89		(193)	(7)
Unrealized components of defined benefit plans
Components of accumulated other comprehensive income, net of taxes
Balance at the beginning of period	(488)		(496)	(423)		(437)	(496)	(437)
Unrealized gains (losses) arising during the period	(7)			0			(8)	13
Tax effects on change in unrealized components	0			(2)			(1)	(6)
Other comprehensive income (loss), net of taxes	0			0			8	14
Balance at the end of period	(488)	(488)		(423)	(423)		(488)	(423)
Amortization of actuarial loss and prior service benefit
Components of accumulated other comprehensive income, net of taxes
Losses (gains) reclassified into earnings	5			1			15	5
Curtailments, settlements and other
Components of accumulated other comprehensive income, net of taxes
Losses (gains) reclassified into earnings	2			1			2	2
Cumulative translation adjustment
Components of accumulated other comprehensive income, net of taxes
Balance at the beginning of period	18		1	(9)		(23)	1	(23)
Unrealized gains (losses) arising during the period	(1)			11			16	25
Tax effects on change in unrealized components	(1)			0			(1)	0
Other comprehensive income (loss), net of taxes	(2)			11			15	25
Balance at the end of period	16	18		2	(9)		16	2
Accumulated other comprehensive loss
Components of accumulated other comprehensive income, net of taxes
Balance at the beginning of period	(843)	(204)	(434)	(332)	(458)	(223)	(434)	(223)
Other comprehensive income (loss), net of taxes	202	(639)	230	(83)	126	(235)
Balance at the end of period	$ (641)	$ (843)	$ (204)	$ (415)	$ (332)	$ (458)	$ (641)	$ (415)

HP INC 10-Q