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Restructuring (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2018 USD ($) | Jul. 31, 2018 USD ($) | Apr. 30, 2018 USD ($) | Jan. 31, 2018 USD ($) | Oct. 31, 2017 USD ($) | Jul. 31, 2017 USD ($) | Apr. 30, 2017 USD ($) | Jan. 31, 2017 USD ($) | Oct. 31, 2018 USD ($) position | Oct. 31, 2017 USD ($) | Oct. 31, 2016 USD ($)
Restructuring and related costs |  |  |  |  |  |  |  |  |  |  |
Reversal of restructuring charges |  |  |  |  |  |  |  |  |  |  | $ 2
Restructuring Reserve |  |  |  |  |  |  |  |  |  |  |
Charges | $ 5 | $ 2 | $ 9 | $ 3 | $ 113 | $ 152 | $ 69 | $ 83 | $ 19 | $ 417 | 417
Short-term portion of restructuring reserve, recorded in Accrued restructuring | 294 |  |  |  | 445 |  |  |  | 294 | 445 |
Long-term portion of restructuring reserve, recorded in Other liabilities | 31 |  |  |  | 96 |  |  |  | 31 | 96 |
Restructuring Plan All |  |  |  |  |  |  |  |  |  |  |
Restructuring Reserve |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period |  |  |  | 254 |  |  |  | 298 | 254 | 298 | 151
Charges |  |  |  |  |  |  |  |  | 19 | 417 | 419
Cash payments |  |  |  |  |  |  |  |  | (181) | (412) | (288)
Non-cash items |  |  |  |  |  |  |  |  | (8) | (49) | 16
Balance at the end of the period | 84 |  |  |  | 254 |  |  |  | 84 | 254 | 298
Total costs incurred to date as of October 31, 2018 | 2,242 |  |  |  |  |  |  |  | 2,242 |  |
Total expected costs to be incurred as of October 31, 2018 | 2,242 |  |  |  |  |  |  |  | 2,242 |  |
Short-term portion of restructuring reserve, recorded in Accrued restructuring | 53 |  |  |  | 158 |  |  |  | 53 | 158 |
Fiscal 2015 Plan |  |  |  |  |  |  |  |  |  |  |
Restructuring Reserve |  |  |  |  |  |  |  |  |  |  |
Total expected costs to be incurred as of October 31, 2018 | 800 |  |  |  |  |  |  |  | $ 800 |  |
Expected positions to be eliminated | position |  |  |  |  |  |  |  |  | 8,300 |  |
Fiscal 2015 Plan | Employee Severance |  |  |  |  |  |  |  |  |  |  |
Restructuring Reserve |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period |  |  |  | 219 |  |  |  | 234 | $ 219 | 234 | 67
Charges |  |  |  |  |  |  |  |  | 9 | 374 | 301
Cash payments |  |  |  |  |  |  |  |  | (158) | (355) | (172)
Non-cash items |  |  |  |  |  |  |  |  | (8) | (34) | 38
Balance at the end of the period | 62 |  |  |  | 219 |  |  |  | 62 | 219 | 234
Total costs incurred to date as of October 31, 2018 | 751 |  |  |  |  |  |  |  | 751 |  |
Total expected costs to be incurred as of October 31, 2018 | 751 |  |  |  |  |  |  |  | 751 |  |
Fiscal 2015 Plan | Infrastructure and other |  |  |  |  |  |  |  |  |  |  |
Restructuring Reserve |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period |  |  |  | 17 |  |  |  | 13 | 17 | 13 | 0
Charges |  |  |  |  |  |  |  |  | (2) | 37 | 42
Cash payments |  |  |  |  |  |  |  |  | (8) | (19) | (19)
Non-cash items |  |  |  |  |  |  |  |  | 3 | (14) | (10)
Balance at the end of the period | 10 |  |  |  | 17 |  |  |  | 10 | 17 | 13
Total costs incurred to date as of October 31, 2018 | 78 |  |  |  |  |  |  |  | 78 |  |
Total expected costs to be incurred as of October 31, 2018 | 78 |  |  |  |  |  |  |  | 78 |  |
Fiscal 2015 Plan | Real estate consolidation |  |  |  |  |  |  |  |  |  |  |
Restructuring Reserve |  |  |  |  |  |  |  |  |  |  |
Total expected costs to be incurred as of October 31, 2018 | 78 |  |  |  |  |  |  |  | 78 |  |
Fiscal 2012 Plan |  |  |  |  |  |  |  |  |  |  |
Restructuring Reserve |  |  |  |  |  |  |  |  |  |  |
Total costs incurred to date as of October 31, 2018 | 1,400 |  |  |  |  |  |  |  | 1,400 |  |
Fiscal 2012 Plan | Infrastructure and other |  |  |  |  |  |  |  |  |  |  |
Restructuring Reserve |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period |  |  |  | 2 |  |  |  | 14 | 2 | 14 | 37
Charges |  |  |  |  |  |  |  |  | (1) | 0 | 1
Cash payments |  |  |  |  |  |  |  |  | 0 | (6) | (15)
Non-cash items |  |  |  |  |  |  |  |  | 0 | (6) | (9)
Balance at the end of the period | 1 |  |  |  | 2 |  |  |  | 1 | 2 | 14
Total costs incurred to date as of October 31, 2018 | 145 |  |  |  |  |  |  |  | 145 |  |
Total expected costs to be incurred as of October 31, 2018 | 145 |  |  |  |  |  |  |  | 145 |  |
Fiscal 2012 Plan | Employee Severance and EER |  |  |  |  |  |  |  |  |  |  |
Restructuring Reserve |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period |  |  |  | $ 16 |  |  |  | $ 37 | 16 | 37 | 47
Charges |  |  |  |  |  |  |  |  | 13 | 6 | 75
Cash payments |  |  |  |  |  |  |  |  | (15) | (32) | (82)
Non-cash items |  |  |  |  |  |  |  |  | (3) | 5 | (3)
Balance at the end of the period | 11 |  |  |  | $ 16 |  |  |  | 11 | 16 | 37
Total costs incurred to date as of October 31, 2018 | 1,268 |  |  |  |  |  |  |  | 1,268 |  |
Total expected costs to be incurred as of October 31, 2018 | $ 1,268 |  |  |  |  |  |  |  | $ 1,268 |  |
Expected positions to be eliminated | position |  |  |  |  |  |  |  |  | 10,300 |  |
Discontinued Operations |  |  |  |  |  |  |  |  |  |  |
Restructuring Reserve |  |  |  |  |  |  |  |  |  |  |
Charges |  |  |  |  |  |  |  |  |  | $ 251 | $ 819

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