Retirement and Post-Retirement Benefit Plans - Summary of Net Benefit Cost (Details) - Benefit Plans - Non-U.S. Defined Benefit Plans - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Apr. 30, 2018 |
Apr. 30, 2017 |
Apr. 30, 2018 |
Apr. 30, 2017 |
|
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] | ||||
| Service cost | $ 27 | $ 30 | $ 53 | $ 70 |
| Interest cost | 58 | 52 | 113 | 102 |
| Expected return on plan assets | (145) | (131) | (284) | (264) |
| Amortization and deferrals: | ||||
| Actuarial loss | 54 | 64 | 106 | 140 |
| Prior service benefit | (4) | (4) | (8) | (8) |
| Net periodic benefit (credit) cost | (10) | 11 | (20) | 40 |
| Settlement loss | 2 | 3 | 2 | 3 |
| Special termination benefits | 2 | 1 | 4 | 2 |
| Plan expense allocation | 0 | (4) | 0 | (16) |
| Net benefit (credit) cost from continuing operations | (6) | 11 | (14) | 29 |
| Discontinued operations | 0 | 34 | 0 | 80 |
| Net benefit (credit) cost | $ (6) | $ 45 | $ (14) | $ 109 |