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Retirement and Post-Retirement Benefit Plans (Tables)
 6 Months Ended
Apr. 30, 2021
Retirement Benefits [Abstract]  
Schedule of Pension and Post-Retirement Benefit (Credit) Cost
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
 202120202021202020212020
 In millions
Service cost$— $— $17 $15 $1 $1 
Interest cost76 103 4 4 2 2 
Expected return on plan assets(127)(175)(12)(10)(6)(5)
Amortization and deferrals:      
Actuarial loss (gain)15 16 14 11 (4)(3)
Prior service benefit— — (1)— (3)(3)
Net periodic benefit (credit) cost(36)(56)22 20 (10)(8)
Settlement loss — 1 — — — — 
Total periodic benefit (credit) cost$(36)$(55)$22 $20 $(10)$(8)
 Six months ended April 30
 U.S. Defined Benefit PlansNon-U.S. Defined Benefit PlansPost- Retirement Benefit Plans
 202120202021202020212020
 In millions
Service cost$— $— $34 $31 $1 $1 
Interest cost152 206 9 9 4 5 
Expected return on plan assets(254)(350)(24)(21)(12)(11)
Amortization and deferrals:
Actuarial loss (gain)30 32 27 21 (8)(5)
Prior service benefit— — (1)(1)(6)(6)
Net periodic benefit (credit) cost(72)(112)45 39 (21)(16)
Settlement loss 1 1 — — — — 
Special termination benefit cost— — — — — 44 
Total periodic benefit (credit) cost$(71)$(111)$45 $39 $(21)$28