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Taxes on Earnings - Uncertain Tax Positions (Narrative) (Details) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Oct. 31, 2018 USD ($) country | Oct. 31, 2017 USD ($) | Oct. 31, 2016 USD ($) | Oct. 31, 2015 USD ($)
Income Tax Disclosure [Abstract] |  |  |  |
Unrecognized tax benefits | $ 7,771 | $ 10,808 | $ 10,858 | $ 6,546
Unrecognized tax benefits that would affect effective tax rate if realized | 1,500 | 3,900 |  |
Decrease in unrecognized tax benefits | 3,000 |  |  |
Accrued income tax for interest and penalties | $ 160 | $ 257 | $ 193 |
Likelihood of no resolution period | 12 months |  |  |
Conclusion of federal, foreign and state tax issues, period | 12 months |  |  |
Reasonably possible decrease in existing unrecognized tax benefits within the next 12 months | $ 6,400 |  |  |
Reasonably possible decrease in associated gain contingencies within the next 12 months | $ 740 |  |  |
Number of other countries in which HP is subject to income taxes | country | 60 |  |  |
Undistributed earnings from non-U.S. operations | $ 5,400 |  |  |

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