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Retirement and Post-Retirement Benefit Plans (Tables)
 12 Months Ended
Oct. 31, 2025
Retirement Benefits [Abstract]  
Schedule of Components of Pension and Post-Retirement Benefit (Credit) Cost Recognized
The components of HP’s pension and post-retirement benefit (credit) cost recognized in the Consolidated Statements of Earnings were as follows:
 For the fiscal years ended October 31
 202520242023202520242023202520242023
 U.S. Defined
Benefit Plans		Non-U.S. Defined
Benefit Plans		Post-Retirement
Benefit Plans
 In millions
Service cost$— $— $— $39 $37 $39 $1 $1 $1 
Interest cost214 228 217 43 46 41 14 15 15 
Expected return on plan assets(241)(246)(258)(57)(51)(53)(14)(15)(14)
Amortization and deferrals:      
Actuarial loss (gain)29 28 18 8 (1)4 (17)(15)(16)
Prior service cost (credit)— — — 7 6 5 (6)(10)(11)
Net periodic benefit cost (credit)
2 10 (23)40 37 36 (22)(24)(25)
Settlement loss
— — — 8 2 — — — — 
Special termination benefit cost— — 105 — — — — — 34 
Total periodic benefit cost (credit)
$2 $10 $82 $48 $39 $36 $(22)$(24)$9 
Schedule of Weighted-Average Assumptions Used to Calculate Total Periodic Benefit (Credit) Cost
The weighted-average assumptions used to calculate the total periodic benefit (credit) cost were as follows: 
 For the fiscal years ended October 31
 202520242023202520242023202520242023
 U.S. Defined
Benefit Plans		Non-U.S. Defined
Benefit Plans		Post-Retirement
Benefit Plans
Discount rate5.3%6.2%5.7%3.2%3.9%3.5%5.2%6.0%5.6%
Expected increase in compensation levels2.0%2.0%2.0%2.7%3.0%3.0%—%—%—%
Expected long-term return on plan assets5.9%6.6%6.4%5.1%5.3%5.4%4.5%5.2%3.3%
Interest crediting rate
5.2%5.5%5.0%2.6%2.6%2.6%4.7%5.4%4.2%
Schedule of Funded Status of Defined Benefit and Post-Retirement Benefit Plans
The funded status of the defined benefit and post-retirement benefit plans was as follows:
 As of October 31
 202520242025202420252024
 U.S. Defined
Benefit Plans		Non-U.S. Defined
Benefit Plans		Post-Retirement
Benefit Plans
 In millions
Change in fair value of plan assets:      
Fair value of assets — beginning of year$4,218 $3,853 $1,085 $959 $317 $382 
Actual return on plan assets314 598 67 111 15 33 
Employer contributions26 26 43 53 5 4 
Participant contributions— — 15 17 25 28 
Benefits paid(250)(258)(38)(54)(48)(48)
Settlement(2)(1)(35)(28)— — 
Transfers
— — — — — (82)
Currency impact— — 67 27 — — 
Fair value of assets — end of year$4,306 $4,218 $1,204 $1,085 $314 $317 
Change in benefits obligation      
Projected benefit obligation — beginning of year$4,218 $3,854 $1,345 $1,185 $287 $299 
Service cost— — 39 37 1 1 
Interest cost214 228 43 46 14 15 
Participant contributions— — 15 17 25 28 
Actuarial loss (gain)
83 395 (16)116 (12)(8)
Benefits paid(250)(258)(38)(54)(48)(48)
Settlement(2)(1)(35)(28)— — 
Currency impact— — 79 26 — — 
Projected benefit obligation — end of year$4,263 $4,218 $1,432 $1,345 $267 $287 
Funded status at end of year$43 $— $(228)$(260)$47 $30 
Accumulated benefit obligation$4,263 $4,217 $1,325 $1,248 
Schedule of Weighted-Average Assumptions Used to Calculate Projected Benefit Obligations
The weighted-average assumptions used to calculate the projected benefit obligations were as follows:
 For the fiscal years ended October 31
 202520242025202420252024
 U.S. Defined
Benefit Plans		Non-U.S. Defined
Benefit Plans		Post-Retirement
Benefit Plans
Discount rate5.3%5.3%3.5%3.2%5.2%5.2%
Expected increase in compensation levels2.0%2.0%2.8%2.7%—%—%
Interest crediting rate
5.1%5.2%2.6%2.6%4.6%4.7%
Schedule of Net Assets And Liabilities For Defined Benefit And Post-Retirement Benefit Plans
The net assets and liabilities for HP’s defined benefit and post-retirement benefit plans recognized on HP’s Consolidated Balance Sheet were as follows:
 As of October 31
 202520242025202420252024
 U.S. Defined
Benefit Plans		Non-U.S. Defined
Benefit Plans		Post-Retirement
Benefit Plans
 In millions
Other non-current assets$313 $277 $61 $50 $51 $35 
Other current liabilities(31)(31)(9)(10)(3)(4)
Other non-current liabilities(239)(246)(280)(300)(1)(1)
Funded status at end of year$43 $— $(228)$(260)$47 $30 
Schedule of Pre-Tax Net Actuarial Loss (Gain) and Prior Service Benefit Recognized in Accumulated Other Comprehensive Loss for Defined Benefit and Post-Retirement Benefit Plans
The following table summarizes the pre-tax net actuarial loss (gain) and prior service cost (credit) recognized in Accumulated other comprehensive income (loss) for the defined benefit and post-retirement benefit plans.
 As of October 31, 2025
 U.S. Defined
Benefit Plans		Non-U.S. Defined
Benefit Plans		Post-Retirement
Benefit Plans
 In millions
Net actuarial loss (gain)$553 $31 $(187)
Prior service cost (credit)— 28 (40)
Total recognized in Accumulated other comprehensive income (loss)$553 $59 $(227)
Schedule of Defined Benefit Plans with Projected Benefit Obligations Exceeding Fair Value of Plan Assets
Defined benefit plans with projected benefit obligations exceeding the fair value of plan assets were as follows:
 As of October 31
 2025202420252024
 U.S. Defined
Benefit Plans		Non-U.S. Defined
Benefit Plans
 In millions
Aggregate fair value of plan assets$— $— $976 $894 
Aggregate projected benefit obligation$270 $277 $1,267 $1,207 
Schedule of Defined Benefit Plans with Accumulated Benefit Obligations Exceeding Fair Value of Plan Assets
Defined benefit plans with accumulated benefit obligations exceeding the fair value of plan assets were as follows:
 As of October 31
 2025202420252024
 U.S. Defined
Benefit Plans		Non-U.S. Defined
Benefit Plans
 In millions
Aggregate fair value of plan assets$— $— $685 $610 
Aggregate accumulated benefit obligation$270 $277 $900 $859 
Schedule of Total Plan Assets by Asset Category
The table below sets forth the total value of plan assets as of October 31, 2025. Refer to Note 9, “Fair Value” for details on fair value hierarchy. Certain investments that are measured using the Net Asset Value (“NAV”) per share as a practical expedient have not been categorized in the fair value hierarchy. 
 As of October 31, 2025
 U.S. Defined Benefit PlansNon-U.S. Defined Benefit PlansPost-Retirement Benefit Plans
 Level 1Level 2Level 3TotalLevel 1Level 2Level 3TotalLevel 1Level 2Level 3Total
 In millions
Asset category:   
Equity securities(1)
$— $18 $— $18 $9 $103 $— $112 $— $2 $— $2 
Debt securities(2)
Corporate
— 2,266 — 2,266 — 58 — 58 — 146 — 146 
Government
— 1,264 — 1,264 — 136 — 136 — 88 — 88 
Real estate funds— — — — — 16 — 16 — — — — 
Insurance contracts— — — — — 79 — 79 — — — — 
Common collective trusts and 103-12 Investment entities(3)
— — — — — 10 — 10 — — — — 
Investment funds(4)
31 — — 31 — 408 — 408 43 — 43 
Cash and cash equivalents(5)
5 28 — 33 25 1 — 26 — — — — 
Other(6)
(129)(11)— (140)— 9 — 9 (3)— (3)
Net plan assets subject to leveling at fair value
$(93)$3,565 $— $3,472 $34 $820 $— $854 $40 $236 $— $276 
Investments using NAV as a practical expedient(7)
834 350 38 
Total plan assets
$4,306 $1,204 $314 
     The table below sets forth the total plan assets as of October 31, 2024.
 As of October 31, 2024
 U.S. Defined Benefit PlansNon-U.S. Defined Benefit PlansPost-Retirement Benefit Plans
 Level 1Level 2Level 3TotalLevel 1Level 2Level 3TotalLevel 1Level 2Level 3Total
 In millions
Asset category:   
Equity securities(1)
$— $17 $— $17 $8 $109 $— $117 $— $— $— $— 
Debt securities(2)
Corporate
— 2,213 — 2,213 — 16 — 16 — 143 — 143 
Government
— 1,392 — 1,392 — 59 — 59 — 102 — 102 
Real estate funds— — — — — — — — — — — — 
Insurance contracts— — — — — 72 — 72 — — — — 
Common collective trusts and 103-12 Investment entities(3)
— — — — — 10 — 10 — — — — 
Investment funds(4)
10 — — 10 — 347 — 347 45 — 45 
Cash and cash equivalents(5)
17 23 — 40 21 1 — 22 — — — — 
Other(6)
(251)(147)— (398)— 116 — 116 (8)— (8)
Net plan assets subject to leveling at fair value
$(224)$3,498 $— $3,274 $29 $730 $— $759 $37 $245 $— $282 
Investments using NAV as a practical expedient(7)
944 326 35 
Total plan assets
$4,218 $1,085 $317 
(1)Investments in publicly traded equity securities are valued using the closing price on the measurement date as reported on the stock exchange on which the individual securities are traded.
(2)The fair value of corporate, government and asset-backed debt securities is based on observable inputs of comparable market transactions. Also included in this category is debt issued by national, state and local governments and agencies.
(3)Department of Labor 103-12 IE (Investment Entity) designation is for plan assets held by two or more unrelated employee benefit plans which includes limited partnerships and venture capital partnerships. Certain common collective trusts and interests in 103-12 entities are valued using NAV as a practical expedient.
(4)Includes publicly traded funds of investment companies that are registered with the SEC, funds that are not publicly traded and a non-U.S. fund-of-fund arrangement.
(5)Includes cash and cash equivalents such as short-term marketable securities. Cash and cash equivalents include money market funds, which are valued based on NAV. Other assets were classified in the fair value hierarchy based on the lowest level input (e.g., quoted prices and observable inputs) that is significant to the fair value measure in its entirety.
(6)Includes primarily reverse repurchase agreements, unsettled transactions, and derivative instruments.
(7)These investments include alternative investments, which primarily consist of private equities and hedge funds. The valuation of alternative investments, such as limited partnerships and joint ventures, may require significant management judgment. For alternative investments, valuation is based on NAV as reported by the asset manager or investment company and adjusted for cash flows, if necessary. In making such an assessment, a variety of factors are reviewed by management, including but not limited to the timeliness of NAV as reported by the asset manager and changes in general economic and market conditions subsequent to the last NAV reported by the asset manager.
•Private equities include limited partnerships such as equity, buyout, venture capital, real estate and other similar funds that invest in the United States and internationally where foreign currencies are hedged.
•Hedge funds include limited partnerships that invest both long and short primarily in common stocks and credit, relative value, event-driven equity, distressed debt and macro strategies. Management of the hedge funds has the ability to shift investments from value to growth strategies, from small to large capitalization stocks and bonds, and from a net long position to a net short position.
These investments also include Common Collective Trusts and 103-12 Investment Entities as defined in note (3) above and Investment Funds as defined in note (4) above.
Schedule of Weighted-Average Target Asset Allocations Across Benefit Plans The weighted-average target asset allocations across the benefit plans represented in the fair value tables above were as follows:
2025 Target Allocation
Asset Category
U.S. Defined
Benefit Plans
Non-U.S. Defined
Benefit Plans		Post-Retirement
Benefit Plans
Equity-related investments—%34.6%—%
Debt securities92.0%38.8%100.0%
Real estate—%9.1%—%
Cash and cash equivalents—%5.6%—%
Other8.0%11.9%—%
Total100.0%100.0%100.0%
Schedule of Estimated Future Benefits Payments for Retirement and Post-Retirement Plans
As of October 31, 2025, HP estimates that the future benefits payments for the retirement and post-retirement plans are as follows:
Fiscal yearU.S. Defined
Benefit Plans		Non-U.S.
Defined
Benefit Plans		Post-Retirement
Benefit Plans
 In millions
2026$288 $63 $25 
2027279 63 23 
2028289 66 22 
2029301 69 22 
2030306 71 21 
Next five fiscal years to October 31, 2035
1,549 429 97