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Taxes on Earnings (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jul. 31, 2020 USD ($) country | Jul. 31, 2019 USD ($) | Jul. 31, 2020 USD ($) country | Jul. 31, 2019 USD ($)
Income Tax Disclosure [Abstract] |  |  |  |
Effective tax rate (percent) | 2.20% | (375.40%) | 11.40% | (36.10%)
Net tax benefit | $ 116 | $ 1,100 | $ 182 | $ 1,100
Tax benefits related to audit settlements | 102 | 1,000 | 143 | 1,000
Tax benefits related to restructuring charges | 20 |  | 75 |
Tax benefits related to acquisition charges | 4 |  | 20 |
Uncertain tax position charges | 3 |  | 54 |
Tax benefits related to utilization of tax attributes |  | 75 |  | 75
Tax benefits related to new guidance |  | 57 |  | 78
Valuation allowance charges |  | 98 |  | 98
Excess tax benefits |  |  |  | 21
Unrecognized tax benefits | 824 |  | 824 |
Unrecognized tax benefits that would affect effective tax rate if realized | 680 |  | 680 |
Unrecognized tax benefits change |  |  | 105 |
Accrued income tax payable for interest and penalties | 37 | $ 75 | $ 37 | $ 75
Likelihood of no resolution period |  |  | 12 months |
Reasonably possible decrease in existing unrecognized tax benefits within the next 12 months | $ 80 |  | $ 80 |
Other countries with income tax jurisdiction | country | 58 |  | 58 |

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