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Stockholders' Deficit (Tables) | 9 Months Ended
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Jul. 31, 2020
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 July 31 |  |  |  | Nine months ended July 31 |  |
| 2020 |  | 2019 |  | 2020 |  | 2019
| In millions |  |  |  |  |  |
Tax effect on change in unrealized components of cash flow hedges: |  |  |  |  |  |  |
Tax benefit (provision) on unrealized (losses) gains arising during the period | $ | 83 |  |  | $ | (7) |  |  | $ | 34 |  |  | $ | (23) |
Tax provision on gains reclassified into earnings | 25 |  |  | 14 |  |  | 51 |  |  | 34 |
| 108 |  |  | 7 |  |  | 85 |  |  | 11 |
Tax effect on change in unrealized components of defined benefit plans: |  |  |  |  |  |  |
Tax benefit on losses arising during the period | 1 |  |  | 4 |  |  | 1 |  |  | 5 |
Tax provision on amortization of actuarial loss and prior service benefit | (5) |  |  | (3) |  |  | (15) |  |  | (9) |
Tax provision on curtailments, settlements and other | — |  |  | (79) |  |  | — |  |  | (78) |
| (4) |  |  | (78) |  |  | (14) |  |  | (82) |
Tax effect on change in cumulative translation adjustment | — |  |  | 8 |  |  | — |  |  | 6 |
Tax benefit (provision) on other comprehensive (loss) income | $ | 104 |  |  | $ | (63) |  |  | $ | 71 |  |  | $ | (65) |
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 July 31 |  |  |  | Nine months ended July 31 |  |
| 2020 |  | 2019 |  | 2020 |  | 2019
| In millions |  |  |  |  |  |
Other comprehensive income (loss), net of taxes: |  |  |  |  |  |  |
Change in unrealized components of available-for-sale debt securities: |  |  |  |  |  |  |
Unrealized gains arising during the period | $ | 2 |  |  | $ | — |  |  | $ | 1 |  |  | $ | — |
Losses reclassified into earnings | — |  |  | — |  |  | — |  |  | 3 |
| 2 |  |  | — |  |  | 1 |  |  | 3 |
Change in unrealized components of cash flow hedges: |  |  |  |  |  |  |
Unrealized (losses) gains arising during the period | (480) |  |  | 173 |  |  | (238) |  |  | 248 |
Gains reclassified into earnings | (105) |  |  | (72) |  |  | (191) |  |  | (225) |
| (585) |  |  | 101 |  |  | (429) |  |  | 23 |
Change in unrealized components of defined benefit plans: |  |  |  |  |  |  |
Losses arising during the period | (4) |  |  | (12) |  |  | (5) |  |  | (15) |
Amortization of actuarial loss and prior service benefit(1) | 15 |  |  | 8 |  |  | 46 |  |  | 25 |
Curtailments, settlements and other | 2 |  |  | (38) |  |  | 3 |  |  | (38) |
| 13 |  |  | (42) |  |  | 44 |  |  | (28) |
Change in cumulative translation adjustment | 15 |  |  | (22) |  |  | 4 |  |  | (16) |
Other comprehensive (loss) income, net of taxes | $ | (555) |  |  | $ | 37 |  |  | $ | (380) |  |  | $ | (18) |
(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 AOCI, net of taxes and changes were as follows:
| Nine months ended July 31, 2020 |  |  |  |  |  |  |  |
| Net unrealized gains on available-for-sale debt securities |  | Net unrealized gains (losses) 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 | $ | 9 |  |  | $ | 172 |  |  | $ | (1,410) |  |  | $ | 4 |  |  | $ | (1,225) |
Other comprehensive income (loss) before reclassifications | 1 |  |  | (238) |  |  | (5) |  |  | 4 |  |  | (238) |
Reclassifications of (gains) losses into earnings | — |  |  | (191) |  |  | 46 |  |  | — |  |  | (145) |
Reclassifications of settlements into earnings | — |  |  | — |  |  | 3 |  |  | — |  |  | 3 |
Balance at end of period | $ | 10 |  |  | $ | (257) |  |  | $ | (1,366) |  |  | $ | 8 |  |  | $ | (1,605) |

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