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Stock-Based Compensation (Detail) - USD ($) |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 01, 2017 | Jan. 25, 2017 | Nov. 01, 2015 | Oct. 31, 2018 | Jul. 31, 2018 | Apr. 30, 2018 | Jan. 31, 2018 | Oct. 31, 2017 | Jul. 31, 2017 | Apr. 30, 2017 | Jan. 31, 2017 | Oct. 31, 2018 | Oct. 31, 2017 | Oct. 31, 2016
Stock-Based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  |  |  |  |  |  |  |  | $ 309,000,000 | $ 454,000,000 | $ 408,000,000
Income tax benefit |  |  |  |  |  |  |  |  |  |  |  | (56,000,000) | (159,000,000) | (131,000,000)
Stock-based compensation expense, net of tax |  |  |  |  |  |  |  |  |  |  |  | 253,000,000 | 295,000,000 | 277,000,000
Separation costs |  |  |  | $ 12,000,000 | $ (2,000,000) | $ 26,000,000 | $ (24,000,000) | $ 202,000,000 | $ 5,000,000 | $ 30,000,000 | $ 11,000,000 | 12,000,000 | 248,000,000 | 362,000,000
Restructuring charges |  |  |  | 5,000,000 | $ 2,000,000 | $ 9,000,000 | $ 3,000,000 | $ 113,000,000 | $ 152,000,000 | $ 69,000,000 | $ 83,000,000 | $ 19,000,000 | $ 417,000,000 | 417,000,000
Increased expense due to the acceleration |  |  |  |  |  |  |  |  |  |  |  |  |  | 33,000,000
Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at end of period (in shares) |  |  |  |  |  |  | 49,274,000 |  |  |  |  | 49,274,000 |  |
Outstanding at end of period (in shares) |  |  |  |  |  |  |  | 49,274,000 |  |  |  |  | 49,274,000 |
Weighted- Average Exercise Price |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at beginning of period (in dollars per share) |  |  |  |  |  |  | $ 10 |  |  |  |  | $ 10 |  |
Outstanding at end of period (in dollars per share) |  |  |  |  |  |  |  | $ 10 |  |  |  |  | $ 10 |
Aggregate Intrinsic Value |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of options assumed (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 8,000,000 |
Weighted-average exercise price of options assumed (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 16 |
Employee Stock Purchase Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense, net of tax |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |
Corporate and unallocated assets | HP Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,000,000
Restricted Stock Awards |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at beginning of period (in shares) |  |  |  |  |  |  | 48,517,000 |  |  |  | 57,321,000 | 48,517,000 | 57,321,000 |
Converted from former Parent's plan (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Granted and assumed through acquisition (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 23,980,000 |
Additional shares granted due to conversion (shares) |  |  |  |  |  |  |  |  |  |  |  |  | 25,543,000 |
Vested (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | (51,976,000) |
Forfeited (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | (6,351,000) |
Outstanding at end of period (in shares) |  |  |  |  |  |  |  | 48,517,000 |  |  |  |  | 48,517,000 | 57,321,000
Weighted- Average Grant Date Fair Value Per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at beginning of period (in dollars per share) |  |  |  |  |  |  | $ 14 |  |  |  | $ 15 | $ 14 | $ 15 |
Converted from former Parent's plan (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Granted and assumed through acquisition (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | 21 |
Additional shares granted due to conversion (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | 9 |
Vested (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | 16 |
Forfeited (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | 16 |
Outstanding at end of period (in dollars per share) |  |  |  |  |  |  |  | $ 14 |  |  |  |  | $ 14 | $ 15
Total grant date fair value of restricted stock vested |  |  |  |  |  |  |  |  |  |  |  | $ 270,000,000 | $ 472,000,000 | $ 130,000,000
Unrecognized pre-tax stock-based compensation expense and recognition period |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized pre-tax stock-based compensation expense |  |  |  | 259,000,000 |  |  |  |  |  |  |  | $ 259,000,000 |  |
Remaining weighted-average vesting period over which pre-tax stock-based compensation expense is expected to be recognized |  |  |  |  |  |  |  |  |  |  |  | 1 year 4 months 24 days |  |
The Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized and available for issuance (shares) |  | 210,000,000 | 260,000,000 |  |  |  |  |  |  |  |  |  |  |
Number of additional shares authorized | 67,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |
Stock Options |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized pre-tax stock-based compensation expense and recognition period |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized pre-tax stock-based compensation expense |  |  |  | $ 7,000,000 |  |  |  |  |  |  |  | $ 7,000,000 |  |
Remaining weighted-average vesting period over which pre-tax stock-based compensation expense is expected to be recognized |  |  |  |  |  |  |  |  |  |  |  | 1 year 3 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) |  |  |  |  |  |  |  |  |  |  |  |  | $ 6 | $ 4
Expected volatility (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 25.70% | 31.10%
Risk-free interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 2.00% | 1.70%
Expected dividend yield (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% | 1.50%
Expected term in years |  |  |  |  |  |  |  |  |  |  |  |  | 6 years 1 month 6 days | 5 years 4 months 12 days
Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at end of period (in shares) |  |  |  |  |  |  | 49,274,000 |  |  |  | 57,498,000 | 49,274,000 | 57,498,000 |
Converted from former Parent's plan (in shares) |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |
Granted and assumed through acquisitions (in shares) |  |  |  |  |  |  |  |  |  |  |  | 316,000 | 6,074,000 |
Additional shares granted due to post-spin adjustments (in shares) |  |  |  |  |  |  |  |  |  |  |  | 0 | 24,523,000 |
Exercised (in shares) |  |  |  |  |  |  |  |  |  |  |  | (26,476,000) | (29,492,000) |
Forfeited/cancelled/expired (in shares) |  |  |  |  |  |  |  |  |  |  |  | (4,851,000) | (9,329,000) |
Outstanding at end of period (in shares) |  |  |  | 18,263,000 |  |  |  | 49,274,000 |  |  |  | 18,263,000 | 49,274,000 | 57,498,000
Vested and expected to vest at end of period (in shares) |  |  |  | 18,038,000 |  |  |  | 48,566,000 |  |  |  | 18,038,000 | 48,566,000 |
Exercisable at end of period (in shares) |  |  |  | 14,896,000 |  |  |  | 24,736,000 |  |  |  | 14,896,000 | 24,736,000 |
Weighted- Average Exercise Price |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at beginning of period (in dollars per share) |  |  |  |  |  |  | $ 10 |  |  |  | $ 15 | $ 10 | $ 15 |
Converted from former Parent's plan (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |
Granted and assumed through acquisition (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | 10 | 23 |
Additional shares granted due to post-spin adjustments (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | 0 | 11 |
Exercised (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | 9 | 12 |
Forfeited/cancelled/expired (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | 13 | 16 |
Outstanding at end of period (in dollars per share) |  |  |  | $ 10 |  |  |  | $ 10 |  |  |  | 10 | 10 | $ 15
Vested and expected to vest at end of period (in dollars per share) |  |  |  | 10 |  |  |  | 10 |  |  |  | 10 | 10 |
Exercisable at end of period (in dollars per share) |  |  |  | $ 10 |  |  |  | $ 9 |  |  |  | $ 10 | $ 9 |
Weighted- Average Remaining Contractual Term |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at end of year(4) |  |  |  |  |  |  |  |  |  |  |  | 4 years 2 months 12 days | 4 years 7 months 6 days |
Vested and expected to vest at end of year(4) |  |  |  |  |  |  |  |  |  |  |  | 4 years 2 months 12 days | 4 years 7 months 6 days |
Exercisable at end of year(4) |  |  |  |  |  |  |  |  |  |  |  | 3 years 8 months 12 days | 3 years |
Aggregate Intrinsic Value |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at end of year(4) |  |  |  | $ 92,000,000 |  |  |  | $ 207,000,000 |  |  |  | $ 92,000,000 | $ 207,000,000 |
Vested and expected to vest at end of year(4) |  |  |  | 91,000,000 |  |  |  | 205,000,000 |  |  |  | 91,000,000 | 205,000,000 |
Exercisable at end of year(4) |  |  |  | $ 85,000,000 |  |  |  | $ 123,000,000 |  |  |  | 85,000,000 | 123,000,000 |
Options exercised |  |  |  |  |  |  |  |  |  |  |  | $ 200,000,000 | $ 218,000,000 | $ 62,000,000
The Plan | Restricted Stock Awards |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at beginning of period (in shares) |  |  |  |  |  |  | 48,517,000 |  |  |  |  | 48,517,000 |  |
Converted from former Parent's plan (in shares) |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
Granted and assumed through acquisition (in shares) |  |  |  |  |  |  |  |  |  |  |  | 22,131,000 |  |
Additional shares granted due to conversion (shares) |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
Vested (in shares) |  |  |  |  |  |  |  |  |  |  |  | (32,659,000) |  |
Forfeited (in shares) |  |  |  |  |  |  |  |  |  |  |  | (5,572,000) |  |
Outstanding at end of period (in shares) |  |  |  | 32,417,000 |  |  |  | 48,517,000 |  |  |  | 32,417,000 | 48,517,000 |
Weighted- Average Grant Date Fair Value Per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at beginning of period (in dollars per share) |  |  |  |  |  |  | $ 14 |  |  |  |  | $ 14 |  |
Converted from former Parent's plan (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
Granted and assumed through acquisition (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | 15 |  |
Additional shares granted due to conversion (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
Vested (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | 14 |  |
Forfeited (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | 14 |  |
Outstanding at end of period (in dollars per share) |  |  |  | $ 14 |  |  |  | $ 14 |  |  |  | $ 14 | $ 14 |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |
Total grant date fair value of options vested |  |  | $ 137,000,000 |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  | $ 10,000,000 | $ 41,000,000 |
Restructuring charges |  |  |  |  |  |  |  |  |  |  |  | 3,000,000 | $ 33,000,000 |
Former Parent Company | Restricted Stock Awards |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at beginning of period (in shares) |  |  | 0 |  |  |  |  |  |  |  | 57,321,000 |  | 57,321,000 | 0
Converted from former Parent's plan (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 42,012,000
Granted and assumed through acquisition (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 32,752,000
Additional shares granted due to conversion (shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Vested (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | (12,747,000)
Forfeited (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | (4,696,000)
Outstanding at end of period (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 57,321,000
Weighted- Average Grant Date Fair Value Per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at beginning of period (in dollars per share) |  |  | $ 0 |  |  |  |  |  |  |  | $ 15 |  | $ 15 | $ 0
Converted from former Parent's plan (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | 15
Granted and assumed through acquisition (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | 15
Additional shares granted due to conversion (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Vested (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | 15
Forfeited (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | 15
Outstanding at end of period (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15
Former Parent Company | Stock Options |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at end of period (in shares) |  |  | 0 |  |  |  |  |  |  |  | 57,498,000 |  | 57,498,000 | 0
Converted from former Parent's plan (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 42,579,000
Granted and assumed through acquisitions (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,390,000
Additional shares granted due to post-spin adjustments (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Exercised (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | (7,845,000)
Forfeited/cancelled/expired (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | (2,626,000)
Outstanding at end of period (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 57,498,000
Vested and expected to vest at end of period (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 55,716,000
Exercisable at end of period (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 26,204,000
Weighted- Average Exercise Price |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at beginning of period (in dollars per share) |  |  | $ 0 |  |  |  |  |  |  |  | $ 15 |  | $ 15 | $ 0
Converted from former Parent's plan (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | 15
Granted and assumed through acquisition (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | 15
Additional shares granted due to post-spin adjustments (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Exercised (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | 11
Forfeited/cancelled/expired (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | 20
Outstanding at end of period (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | 15
Vested and expected to vest at end of period (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | 15
Exercisable at end of period (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13
Weighted- Average Remaining Contractual Term |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at end of year(4) |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years 4 months 24 days
Vested and expected to vest at end of year(4) |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years 3 months 18 days
Exercisable at end of year(4) |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years 9 months 18 days
Aggregate Intrinsic Value |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at end of year(4) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 437,000,000
Vested and expected to vest at end of year(4) |  |  |  |  |  |  |  |  |  |  |  |  |  | 425,000,000
Exercisable at end of year(4) |  |  |  |  |  |  |  |  |  |  |  |  |  | 241,000,000
Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  |  |  |  |  |  |  |  | 0 | $ 166,000,000 | 189,000,000
Restructuring charges |  |  |  |  |  |  |  |  |  |  |  |  | 251,000,000 | $ 819,000,000
SGI And Nimble Storage | The Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  |  |  |  | $ 10,000,000 | $ 23,000,000 |
2017 Acquisitions | Restricted Stock Awards |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted- Average Grant Date Fair Value Per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares assumed in period (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 11,000,000 |
Granted (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 18 |
Everett and Seattle Transactions | Restricted Stock Awards |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vested (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | (14,000,000) |
Forfeited (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | (300,000) |
Weighted- Average Grant Date Fair Value Per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vested (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 17 |
Forfeited (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 18 |
Everett Transaction | Restricted Stock Awards |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vested (in shares) |  |  |  |  |  |  |  |  |  |  |  | (6,000,000) |  |
Weighted- Average Grant Date Fair Value Per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vested (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 14 |  |
Everett Transaction | The Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Separation costs |  |  |  |  |  |  |  |  |  |  |  |  | $ 126,000,000 |
Restructuring charges |  |  |  |  |  |  |  |  |  |  |  |  | 34,000,000 |
Everett Transaction | Net Income (Loss) | Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  | $ 92,000,000 |

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