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Stockholders' Deficit - Changes and Reclassifications Related to Other Comprehensive Income, Net of Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Apr. 30, 2021 | Apr. 30, 2020 | Apr. 30, 2021 | Apr. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Unrealized (losses) gains arising during the period |  |  | $ (287) |
Losses (gains) reclassified into earnings |  |  | 209 |
Other comprehensive income (loss), net of taxes | $ 153 | $ 158 | (77) | $ 175
Change in unrealized gains (losses) on available-for-sale securities |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Unrealized (losses) gains arising during the period | 0 | (2) | 3 | (1)
Losses (gains) reclassified into earnings |  |  | 0 |
Net unrealized (losses) gains on cash flow hedges |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Unrealized (losses) gains arising during the period | (28) | 198 | (347) | 242
Losses (gains) reclassified into earnings | 132 | (37) | 177 | (86)
Other comprehensive income (loss), net of taxes | 104 | 161 | (170) | 156
Tax provision on gains arising during the period |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Unrealized (losses) gains arising during the period | 31 | (1) | 30 | (1)
Tax benefit on amortization of actuarial loss and prior service benefit |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Losses (gains) reclassified into earnings | 16 | 16 | 32 | 31
Curtailments, settlements and other |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Losses (gains) reclassified into earnings | 0 | 1 | 1 | 1
Change in unrealized components of defined benefit plans |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Unrealized (losses) gains arising during the period |  |  | 30 |
Losses (gains) reclassified into earnings |  |  | 32 |
Other comprehensive income (loss), net of taxes | 47 | 16 | 63 | 31
Change in cumulative translation adjustment |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Unrealized (losses) gains arising during the period |  |  | 27 |
Losses (gains) reclassified into earnings |  |  | 0 |
Change in cumulative translation adjustment | $ 2 | $ (17) | $ 27 | $ (11)

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