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Stockholders' Deficit (Tables) | 6 Months Ended
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Apr. 30, 2021
Stockholders' Equity Note [Abstract] |
Schedule of Tax Effects Related to Other Comprehensive (Loss) Income | Tax effects related to Other Comprehensive Income (Loss)
| Three months ended April 30 |  | Six months ended April 30
| 2021 |  | 2020 |  | 2021 |  | 2020
| In millions
Tax effect on change in unrealized components of available-for-sale debt securities: |  |  |  |  |  |  |
Tax provision on unrealized gains arising during the period | $ | — |  |  | $ | — |  |  | $ | (1) |  |  | $ | — |
Tax effect on change in unrealized components of cash flow hedges: |  |  |  |  |  |  |
Tax (provision) benefit on unrealized gains (losses) arising during the period | (7) |  |  | (33) |  |  | 40 |  |  | (49) |
Tax (benefit) provision on losses (gains) reclassified into earnings | (17) |  |  | 16 |  |  | (21) |  |  | 26 |
| (24) |  |  | (17) |  |  | 19 |  |  | (23) |
Tax effect on change in unrealized components of defined benefit plans: |  |  |  |  |  |  |
Tax provision on gains arising during the period | (11) |  |  | — |  |  | (11) |  |  | — |
Tax benefit on amortization of actuarial loss and prior service benefit | (5) |  |  | (5) |  |  | (10) |  |  | (10) |
| (16) |  |  | (5) |  |  | (21) |  |  | (10) |
Tax effect on change in cumulative translation adjustment | (1) |  |  | — |  |  | (6) |  |  | — |
Tax provision on other comprehensive income | $ | (41) |  |  | $ | (22) |  |  | $ | (9) |  |  | $ | (33) |
Schedule of Changes and Reclassifications Related to Other Comprehensive Income, Net of Taxes | Changes and reclassifications related to Other Comprehensive Income (Loss), net of taxes
| Three months ended April 30 |  | Six months ended April 30
| 2021 |  | 2020 |  | 2021 |  | 2020
| In millions
Other comprehensive income (loss), net of taxes: |  |  |  |  |  |  |
Change in unrealized components of available-for-sale debt securities: |  |  |  |  |  |  |
Unrealized (losses) gains arising during the period | $ | — |  |  | $ | (2) |  |  | $ | 3 |  |  | $ | (1) |
Change in unrealized components of cash flow hedges: |  |  |  |  |  |  |
Unrealized (losses) gains arising during the period | (28) |  |  | 198 |  |  | (347) |  |  | 242 |
Losses (gains) reclassified into earnings | 132 |  |  | (37) |  |  | 177 |  |  | (86) |
| 104 |  |  | 161 |  |  | (170) |  |  | 156 |
Change in unrealized components of defined benefit plans: |  |  |  |  |  |  |
Gains (losses) arising during the period | 31 |  |  | (1) |  |  | 30 |  |  | (1) |
Amortization of actuarial loss and prior service benefit(1) | 16 |  |  | 16 |  |  | 32 |  |  | 31 |
Curtailments, settlements and other | — |  |  | 1 |  |  | 1 |  |  | 1 |
| 47 |  |  | 16 |  |  | 63 |  |  | 31 |
Change in cumulative translation adjustment | 2 |  |  | (17) |  |  | 27 |  |  | (11) |
Other comprehensive income (loss), net of taxes | $ | 153 |  |  | $ | 158 |  |  | $ | (77) |  |  | $ | 175 |
(1)These components are included in the computation of net pension and post-retirement benefit (credit) charges in Note 4, “Retirement and Post-Retirement Benefit Plans”.
Schedule of Accumulated Other Comprehensive Loss, Net of Taxes | The components of Accumulated other comprehensive loss, net of taxes and changes were as follows:
| Six months ended April 30, 2021
| Net unrealized gains on available-for-sale debt securities |  | Net unrealized (losses) gains on cash flow hedges |  | Unrealized components of defined benefit plans |  | Change in cumulative translation adjustment |  | Accumulated other comprehensive loss
| In millions
Balance at beginning of period | $ | 11 |  |  | $ | (66) |  |  | $ | (1,190) |  |  | $ | 2 |  |  | $ | (1,243) |
Other comprehensive income (loss) before reclassifications | 3 |  |  | (347) |  |  | 30 |  |  | 27 |  |  | (287) |
Reclassifications of losses into earnings | — |  |  | 177 |  |  | 32 |  |  | — |  |  | 209 |
Reclassifications of settlements into earnings | — |  |  | — |  |  | 1 |  |  | — |  |  | 1 |
Balance at end of period | $ | 14 |  |  | $ | (236) |  |  | $ | (1,127) |  |  | $ | 29 |  |  | $ | (1,320) |

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