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Retirement and Post-Retirement Benefit Plans (Details 5) - USD ($) $ in Millions | Oct. 31, 2018 | Oct. 31, 2017 | Oct. 31, 2016
--- | --- | --- | ---
Post-Retirement Benefit Plans |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | $ 52 | $ 50 | $ 47
Post-Retirement Benefit Plans | Registered Investment Companies |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 52 | 50 |
Non-U.S. Plans | Defined Benefit Plans |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 12,167 | 12,610 | 11,989
Non-U.S. Plans | Defined Benefit Plans | U.S. |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 194 | 283 |
Non-U.S. Plans | Defined Benefit Plans | Non-U.S. |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 569 | 505 |
Non-U.S. Plans | Defined Benefit Plans | Non-U.S. at NAV |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 473 | 480 |
Non-U.S. Plans | Defined Benefit Plans | Corporate |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 1,221 | 1,966 |
Non-U.S. Plans | Defined Benefit Plans | Government debt securities |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 4,621 | 702 |
Non-U.S. Plans | Defined Benefit Plans | Government at NAV |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 692 | 687 |
Non-U.S. Plans | Defined Benefit Plans | Private Equity |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 42 | 40 |
Non-U.S. Plans | Defined Benefit Plans | Hybrids |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 1,346 | 492 |
Non-U.S. Plans | Defined Benefit Plans | Hybrids At NAV |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 506 | 2,339 |
Non-U.S. Plans | Defined Benefit Plans | Hedge Funds |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 45 | 63 |
Non-U.S. Plans | Defined Benefit Plans | Hedge Funds at NAV |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 0 | 21 |
Non-U.S. Plans | Defined Benefit Plans | Equities at NAV |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 1,929 | 2,547 |
Non-U.S. Plans | Defined Benefit Plans | Fixed Income at NAV |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 639 | 701 |
Non-U.S. Plans | Defined Benefit Plans | Emerging Markets at NAV |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 275 | 368 |
Non-U.S. Plans | Defined Benefit Plans | Alternative investments at NAV |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 378 | 363 |
Non-U.S. Plans | Defined Benefit Plans | Real Estate Funds |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 229 | 253 |
Non-U.S. Plans | Defined Benefit Plans | Insurance Group Annuity Contracts |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 97 | 87 |
Non-U.S. Plans | Defined Benefit Plans | Cash and cash equivalents |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 423 | 547 |
Non-U.S. Plans | Defined Benefit Plans | Other |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 290 | 166 |
Non-U.S. Plans | Defined Benefit Plans | Obligation to Return Cash Received From Repurchase Agreements |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | (1,802) | 0 |
Non-U.S. Plans | Defined Benefit Plans | Level 1 |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 743 | 900 |
Non-U.S. Plans | Defined Benefit Plans | Level 1 | U.S. |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 187 | 270 |
Non-U.S. Plans | Defined Benefit Plans | Level 1 | Non-U.S. |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 344 | 365 |
Non-U.S. Plans | Defined Benefit Plans | Level 1 | Corporate |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 0 | 0 |
Non-U.S. Plans | Defined Benefit Plans | Level 1 | Government debt securities |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 0 | 0 |
Non-U.S. Plans | Defined Benefit Plans | Level 1 | Private Equity |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 0 | 0 |
Non-U.S. Plans | Defined Benefit Plans | Level 1 | Hybrids |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 0 | 0 |
Non-U.S. Plans | Defined Benefit Plans | Level 1 | Hybrids At NAV |  |  |
Defined benefit plans |  |  |
Fair value of plan assets |  |  |
Non-U.S. Plans | Defined Benefit Plans | Level 1 | Hedge Funds |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 0 | 0 |
Non-U.S. Plans | Defined Benefit Plans | Level 1 | Equities at NAV |  |  |
Defined benefit plans |  |  |
Fair value of plan assets |  |  |
Non-U.S. Plans | Defined Benefit Plans | Level 1 | Fixed Income at NAV |  |  |
Defined benefit plans |  |  |
Fair value of plan assets |  |  |
Non-U.S. Plans | Defined Benefit Plans | Level 1 | Emerging Markets at NAV |  |  |
Defined benefit plans |  |  |
Fair value of plan assets |  |  |
Non-U.S. Plans | Defined Benefit Plans | Level 1 | Alternative investments at NAV |  |  |
Defined benefit plans |  |  |
Fair value of plan assets |  |  |
Non-U.S. Plans | Defined Benefit Plans | Level 1 | Real Estate Funds |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 6 | 38 |
Non-U.S. Plans | Defined Benefit Plans | Level 1 | Insurance Group Annuity Contracts |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 0 | 0 |
Non-U.S. Plans | Defined Benefit Plans | Level 1 | Cash and cash equivalents |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 167 | 184 |
Non-U.S. Plans | Defined Benefit Plans | Level 1 | Other |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 39 | 43 |
Non-U.S. Plans | Defined Benefit Plans | Level 1 | Obligation to Return Cash Received From Repurchase Agreements |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 0 | 0 |
Non-U.S. Plans | Defined Benefit Plans | Level 2 |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 6,284 | 4,061 |
Non-U.S. Plans | Defined Benefit Plans | Level 2 | U.S. |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 7 | 13 |
Non-U.S. Plans | Defined Benefit Plans | Level 2 | Non-U.S. |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 225 | 140 |
Non-U.S. Plans | Defined Benefit Plans | Level 2 | Corporate |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 1,221 | 1,966 |
Non-U.S. Plans | Defined Benefit Plans | Level 2 | Government debt securities |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 4,621 | 702 |
Non-U.S. Plans | Defined Benefit Plans | Level 2 | Private Equity |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 2 | 7 |
Non-U.S. Plans | Defined Benefit Plans | Level 2 | Hybrids |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 1,214 | 492 |
Non-U.S. Plans | Defined Benefit Plans | Level 2 | Hybrids At NAV |  |  |
Defined benefit plans |  |  |
Fair value of plan assets |  |  |
Non-U.S. Plans | Defined Benefit Plans | Level 2 | Hedge Funds |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 45 | 63 |
Non-U.S. Plans | Defined Benefit Plans | Level 2 | Equities at NAV |  |  |
Defined benefit plans |  |  |
Fair value of plan assets |  |  |
Non-U.S. Plans | Defined Benefit Plans | Level 2 | Fixed Income at NAV |  |  |
Defined benefit plans |  |  |
Fair value of plan assets |  |  |
Non-U.S. Plans | Defined Benefit Plans | Level 2 | Emerging Markets at NAV |  |  |
Defined benefit plans |  |  |
Fair value of plan assets |  |  |
Non-U.S. Plans | Defined Benefit Plans | Level 2 | Alternative investments at NAV |  |  |
Defined benefit plans |  |  |
Fair value of plan assets |  |  |
Non-U.S. Plans | Defined Benefit Plans | Level 2 | Real Estate Funds |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 186 | 158 |
Non-U.S. Plans | Defined Benefit Plans | Level 2 | Insurance Group Annuity Contracts |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 59 | 35 |
Non-U.S. Plans | Defined Benefit Plans | Level 2 | Cash and cash equivalents |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 256 | 363 |
Non-U.S. Plans | Defined Benefit Plans | Level 2 | Other |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 250 | 122 |
Non-U.S. Plans | Defined Benefit Plans | Level 2 | Obligation to Return Cash Received From Repurchase Agreements |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | (1,802) | 0 |
Non-U.S. Plans | Defined Benefit Plans | Level 3 |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 248 | 143 | 129
Non-U.S. Plans | Defined Benefit Plans | Level 3 | U.S. |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 0 | 0 |
Non-U.S. Plans | Defined Benefit Plans | Level 3 | Non-U.S. |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 0 | 0 |
Non-U.S. Plans | Defined Benefit Plans | Level 3 | Corporate |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 0 | 0 |
Non-U.S. Plans | Defined Benefit Plans | Level 3 | Government debt securities |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 0 | 0 |
Non-U.S. Plans | Defined Benefit Plans | Level 3 | Private Equity |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 40 | 33 | 32
Non-U.S. Plans | Defined Benefit Plans | Level 3 | Hybrids |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 132 | 0 |
Non-U.S. Plans | Defined Benefit Plans | Level 3 | Hybrids At NAV |  |  |
Defined benefit plans |  |  |
Fair value of plan assets |  |  |
Non-U.S. Plans | Defined Benefit Plans | Level 3 | Hedge Funds |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 0 | 0 |
Non-U.S. Plans | Defined Benefit Plans | Level 3 | Equities at NAV |  |  |
Defined benefit plans |  |  |
Fair value of plan assets |  |  |
Non-U.S. Plans | Defined Benefit Plans | Level 3 | Fixed Income at NAV |  |  |
Defined benefit plans |  |  |
Fair value of plan assets |  |  |
Non-U.S. Plans | Defined Benefit Plans | Level 3 | Emerging Markets at NAV |  |  |
Defined benefit plans |  |  |
Fair value of plan assets |  |  |
Non-U.S. Plans | Defined Benefit Plans | Level 3 | Alternative investments at NAV |  |  |
Defined benefit plans |  |  |
Fair value of plan assets |  |  |
Non-U.S. Plans | Defined Benefit Plans | Level 3 | Real Estate Funds |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 37 | 57 | 26
Non-U.S. Plans | Defined Benefit Plans | Level 3 | Insurance Group Annuity Contracts |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 38 | 52 | 63
Non-U.S. Plans | Defined Benefit Plans | Level 3 | Cash and cash equivalents |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 0 | 0 |
Non-U.S. Plans | Defined Benefit Plans | Level 3 | Other |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | 1 | 1 | $ 8
Non-U.S. Plans | Defined Benefit Plans | Level 3 | Obligation to Return Cash Received From Repurchase Agreements |  |  |
Defined benefit plans |  |  |
Fair value of plan assets | $ 0 | $ 0 |

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