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Taxes on Earnings - Schedule of Differences Between U.S. Federal Statutory Income Tax Rate and HP's Effective Tax Rate (Details)
12 Months Ended
Oct. 31, 2018
Oct. 31, 2017
Oct. 31, 2016
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
U.S. federal statutory income tax rate from continuing operations 23.30% 35.00% 35.00%
State income taxes from continuing operations, net of federal tax benefit 0.50% 1.40% 1.10%
Lower rates in other jurisdictions, net (10.90%) (13.20%) (9.30%)
U.S. Tax Reform impacts (35.80%) 0.00% 0.00%
Research and development (“R&D”) credit (0.70%) (0.50%) (2.40%)
Valuation allowances (9.30%) (1.90%) (1.20%)
Uncertain tax positions and audit settlements (50.30%) 0.40% 11.70%
Indemnification related items 5.20% (0.30%) (4.10%)
Other, net 1.20% 2.00% (1.70%)
Effective tax rate (76.80%) 22.90% 29.10%