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Retirement and Post-Retirement Benefit Plans (Tables)
 6 Months Ended
Apr. 30, 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 April 30
 U.S. Defined Benefit PlansNon-U.S. Defined Benefit PlansPost-Retirement Benefit Plans
 202520242025202420252024
 In millions
Service cost$— $— $10 $9 $— $— 
Interest cost53 57 10 11 3 4 
Expected return on plan assets(62)(62)(13)(13)(3)(4)
Amortization and deferrals:      
Actuarial loss (gain)8 7 2 — (5)(4)
Prior service cost (credit)— — 1 1 (1)(2)
Net periodic benefit (credit) cost(1)2 10 8 (6)(6)
Settlement loss— — 1 1 — — 
Total periodic benefit (credit) cost$(1)$2 $11 $9 $(6)$(6)
 Six months ended April 30
 U.S. Defined Benefit PlansNon-U.S. Defined Benefit PlansPost-Retirement Benefit Plans
 202520242025202420252024
 In millions
Service cost$— $— $19 $18 $— $— 
Interest cost106 114 20 23 7 8 
Expected return on plan assets(121)(123)(27)(26)(7)(8)
Amortization and deferrals:
Actuarial loss (gain)15 14 4 — (9)(8)
Prior service cost (credit)— — 3 3 (3)(5)
Net periodic benefit cost (credit)$— $5 $19 $18 $(12)$(13)
Settlement loss — — 1 1 — — 
Total periodic benefit cost (credit)$— $5 $20 $19 $(12)$(13)