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Taxes on Earnings (Detail 3) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 31, 2018 | Jul. 31, 2018 | Apr. 30, 2018 | Jan. 31, 2018 | Oct. 31, 2017 | Jul. 31, 2017 | Apr. 30, 2017 | Jan. 31, 2017 | Jul. 31, 2018 | Oct. 31, 2018 | Oct. 31, 2017 | Oct. 31, 2016 | Oct. 31, 2015
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax benefits related to items unique to the year |  |  |  |  |  |  |  |  |  | $ (2,000) | $ 554 | $ (250) |
Provision for (benefit from) taxes on earnings | $ 1,348 | $ 13 | $ (966) | $ (2,139) | $ (679) | $ (160) | $ 591 | $ 84 |  | (1,744) | (164) | 623 |
Income tax benefits related to acquisition, separation, divestiture |  |  |  |  |  |  |  |  |  | 208 | 88 |  |
Valuation allowance on deferred tax assets | 8,209 |  |  |  | 2,789 |  |  |  |  | 8,209 | 2,789 |  |
Income tax charges related to tax indemnification |  |  |  |  |  |  |  |  |  |  | 699 |  |
Settlement of pre-separation liabilities |  |  |  |  |  |  |  |  |  | 125 | 326 |  |
Share-based compensation cost |  |  |  |  |  |  |  |  |  | 65 |  |  |
Income tax benefits related to restructuring and separation related costs |  |  |  |  |  |  |  |  |  |  |  | 647 |
Income tax benefits for adjustments to uncertain tax positions |  |  |  |  |  |  |  |  |  |  |  | 169 |
Income tax charges related to state tax impacts |  |  |  |  |  |  |  |  |  |  |  | 124 |
Income tax benefits, reduced rates for subsidiaries in certain countries |  |  |  |  |  |  |  |  |  | $ 792 | $ 378 | $ 401 |
Income tax benefits, reduced rates for subsidiaries in certain countries (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 0.51 | $ 0.23 | $ 0.23 |
U.S. federal statutory income tax rate |  |  |  |  |  |  |  |  | 23.30% | 23.30% | 35.00% | 35.00% |
Transition tax |  |  |  |  |  |  |  |  |  | $ 1,700 |  |  |
Estimated change in income tax expense (benefit) |  |  |  |  |  |  |  |  |  | (1,700) |  |  |
Tax benefit related to reversal of deferred tax recognized | 3,700 |  |  |  |  |  |  |  |  | 3,700 |  |  |
Estimated deferred tax asset valuation alllowance |  |  |  |  |  |  |  |  |  | 687 |  |  |
Spinoff | Everett SpinCo, Inc. and Seattle SpinCo, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Provision for (benefit from) taxes on earnings |  |  |  |  |  |  |  |  |  | (2,000) |  |  |
Disposed of by sale | HC3 |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Provision for (benefit from) taxes on earnings |  |  |  |  |  |  |  |  |  |  | $ 473 |  |
State |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Valuation allowance on deferred tax assets | 422 |  |  |  |  |  |  |  |  | 422 |  |  |
Income tax benefits related to valuation allowances |  |  |  |  |  |  |  |  |  |  |  | $ 714 |
Foreign |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax benefits related to valuation allowances |  |  |  |  |  |  |  |  |  |  |  | (509) |
Deferred tax asset valuation allowance |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Provision for (benefit from) taxes on earnings |  |  |  |  |  |  |  |  |  | 166 | (848) | 203 |
Valuation allowance on deferred tax assets | $ 8,209 |  |  |  | $ 2,789 |  |  |  |  | 8,209 | 2,789 | 2,095 | $ 1,572
Valuation allowance offsetting current year losses recorded |  |  |  |  |  |  |  |  |  | $ 5,028 | $ 0 | $ 0 |

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