Stock-Based Compensation (Detail) - USD ($)		12 Months Ended
	Nov. 01, 2015	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2014
Stock-Based Compensation
Common stock, authorized (shares)		9,600,000,000
Stock-based compensation expense		$ 597,000,000	$ 565,000,000	$ 427,000,000
Income tax benefit		(181,000,000)	(165,000,000)	(141,000,000)
Stock-based compensation expense, net of tax		416,000,000	400,000,000	286,000,000
Separation costs		598,000,000	797,000,000	0
Restructuring charges		$ 1,236,000,000	954,000,000	1,471,000,000
Increased expense due to the acceleration			$ 61,000,000
Shares
Outstanding at end of period (in shares)	0	0
Outstanding at end of period (in shares)			0
Weighted- Average Exercise Price
Outstanding at beginning of period (in dollars per share)	$ 0	$ 0
Outstanding at end of period (in dollars per share)			$ 0
Employee Stock Purchase Plan
Stock-Based Compensation
Common stock, authorized (shares)	80,000,000
Stock-based compensation expense, net of tax		$ 0	$ 0
Cash received from option exercises and purchases		$ 119,000,000	21,000,000	154,000,000
Benefit realized for the tax deduction from option exercises of share-based payment awards			45,000,000	42,000,000
Corporate and unallocated assets | HP Inc.
Stock-Based Compensation
Stock-based compensation expense			$ 151,000,000	$ 113,000,000
Restricted Stock Awards
Shares
Outstanding at beginning of period (in shares)	24,400,000	24,400,000	24,496,000	18,170,000
Converted from former Parent's plan (in shares)			0	0
Granted and assumed through acquisition (in shares)			19,601,000	15,820,000
Vested (in shares)			(21,860,000)	(7,893,000)
Forfeited (in shares)			(1,819,000)	(1,601,000)
Employee transition (in shares)			3,982,000	0
Outstanding at end of period (in shares)			24,400,000	24,496,000
Weighted- Average Grant Date Fair Value Per Share
Outstanding at beginning of period (in dollars per share)	$ 32	$ 32	$ 24	$ 20
Converted from former Parent's plan (in dollars per share)			0	0
Granted (in dollars per share)			35	28
Vested (in dollars per share)			26	24
Forfeited (in dollars per share)			30	22
Employee transition (in dollars per share)			33	0
Outstanding at end of period (in dollars per share)			$ 32	$ 24
Total grant date fair value of restricted stock vested		$ 130,000,000	$ 451,000,000	$ 128,000,000
Additional disclosures information
Restricted stock unit assumed through acquisition (in shares)			8,000,000
Wighted-average grant date fair value through acquisition (in dollars per share)			$ 33
Unrecognized pre-tax stock-based compensation expense and recognition period
Unrecognized pre-tax stock-based compensation expense		$ 463,000,000
Remaining weighted-average vesting period over which pre-tax stock-based compensation expense is expected to be recognized		1 year 2 months 12 days
Shares
Outstanding at end of period (in shares)			24,496,000
Outstanding at end of period (in shares)				24,496,000
The Plan
Stock-Based Compensation
Number of shares authorized and available for issuance (shares)	260,000,000
Cash-settled awards and restricted stock awards | Minimum
Stock-Based Compensation
Vesting period		1 year
Cash-settled awards and restricted stock awards | Maximum
Stock-Based Compensation
Vesting period		3 years
Stock Options
Stock-Based Compensation
Total grant date fair value of options vested		$ 18,000,000	$ 38,000,000	$ 46,000,000
Unrecognized pre-tax stock-based compensation expense and recognition period
Unrecognized pre-tax stock-based compensation expense		$ 58,000,000
Remaining weighted-average vesting period over which pre-tax stock-based compensation expense is expected to be recognized		1 year 9 months 18 days
Weighted-average fair value and the assumptions used to measure fair value
Weighted- average fair value of grants per option (in dollars per share)		$ 4	$ 8	$ 7
Expected volatility (as a percent)		31.10%	26.80%	33.10%
Risk-free interest rate (as a percent)		1.70%	1.70%	1.80%
Expected dividend yield (as a percent)		1.50%	1.80%	2.10%
Expected term in years		5 years 4 months 12 days	5 years 10 months 24 days	5 years 8 months 12 days
Shares
Outstanding at end of period (in shares)	26,178,000	26,178,000	24,472,000	37,433,000
Converted from former Parent's plan (in shares)		42,579,000	0	0
Granted and assumed through acquisitions (in shares)		25,390,000	3,147,000	4,255,000
Exercised (in shares)		(7,845,000)	(5,716,000)	(5,533,000)
Forfeited/cancelled/expired (in shares)		(2,626,000)	(7,116,000)	(11,683,000)
Employee transition (in shares)		0	11,391,000	0
Outstanding at end of period (in shares)		57,498,000	26,178,000	24,472,000
Vested and expected to vest at end of period (in shares)		55,716,000	25,309,000	23,152,000
Exercisable at end of period (in shares)		26,204,000	18,767,000	14,174,000
Weighted- Average Exercise Price
Outstanding at beginning of period (in dollars per share)	$ 26	$ 26	$ 27	$ 26
Converted from former Parent's plan (in dollars per share)		15	0	0
Granted and assumed through acquisition (in dollars per share)		15	37	28
Exercised (in dollars per share)		11	18	18
Forfeited/cancelled/expired (in dollars per share)		20	40	37
Employee transition (in dollars per share)		0	26	0
Outstanding at end of period (in dollars per share)		15	26	27
Vested and expected to vest at end of period (in dollars per share)		15	26	27
Exercisable at end of period (in dollars per share)		$ 13	$ 23	$ 31
Weighted- Average Remaining Contractual Term
Outstanding at end of year		5 years 4 months 12 days	5 years 2 months 12 days	4 years 2 months 12 days
Vested and expected to vest at end of year		5 years 3 months 12 days	5 years 2 months 12 days	4 years
Exercisable at end of year		3 years 9 months 12 days	4 years 8 months 12 days	2 years 6 months
Aggregate Intrinsic Value
Outstanding at end of year		$ 437,000,000	$ 115,000,000	$ 272,000,000
Vested and expected to vest at end of year		425,000,000	115,000,000	252,000,000
Exercisable at end of year		241,000,000	109,000,000	119,000,000
Options exercised		$ 62,000,000	$ 94,000,000	$ 78,000,000
Stock Options | Minimum
Stock-Based Compensation
Vesting period		3 years
Stock Options | Maximum
Stock-Based Compensation
Vesting period		4 years
The Plan | Restricted Stock Awards
Shares
Outstanding at beginning of period (in shares)	0	0
Converted from former Parent's plan (in shares)		42,012,000
Granted and assumed through acquisition (in shares)		32,752,000
Vested (in shares)		(12,747,000)
Forfeited (in shares)		(4,696,000)
Employee transition (in shares)		0
Outstanding at end of period (in shares)		57,321,000	0
Weighted- Average Grant Date Fair Value Per Share
Outstanding at beginning of period (in dollars per share)	$ 0	$ 0
Converted from former Parent's plan (in dollars per share)		15
Granted (in dollars per share)		15
Vested (in dollars per share)		15
Forfeited (in dollars per share)		15
Employee transition (in dollars per share)		0
Outstanding at end of period (in dollars per share)		$ 15	$ 0
One Time Retention Stock Awards | Restricted Stock Awards
Shares
Granted and assumed through acquisition (in shares)		5,000,000
One Time Retention Stock Awards | The Plan
Stock-Based Compensation
Total grant date fair value of options vested	$ 137,000,000
Vesting period	3 years
One Time Retention Stock Awards | Stock Options
Shares
Granted and assumed through acquisitions (in shares)		16,000,000
The Plan
Stock-Based Compensation
Separation costs		$ 31,000,000
Restructuring charges		$ 8,000,000
Former Parent Company | Employee Stock Purchase Plan
Stock-Based Compensation
Cash received from option exercises and purchases			$ 165,000,000