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Retirement and Post-Retirement Benefit Plans (Tables)
 3 Months Ended
Jan. 31, 2025
Retirement Benefits [Abstract]  
Schedule of Components of Pension and Post-Retirement Benefit (Credit)
The components of HP’s pension and post-retirement benefit (credit) cost recognized in the Consolidated Condensed Statements of Earnings were as follows:
 Three months ended January 31
 U.S. Defined Benefit PlansNon-U.S. Defined Benefit PlansPost-Retirement Benefit Plans
 202520242025202420252024
 In millions
Service cost$— $— $9 $9 $— $— 
Interest cost53 57 10 12 4 4 
Expected return on plan assets(59)(61)(14)(13)(4)(4)
Amortization and deferrals:
Actuarial loss (gain)7 7 2 — (4)(4)
Prior service cost (credit)— — 2 2 (2)(3)
Net periodic benefit cost (credit)$1 $3 $9 $10 $(6)$(7)
Total periodic benefit cost (credit)$1 $3 $9 $10 $(6)$(7)