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Stockholders' Deficit - Schedule of Taxes Related to Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jul. 31, 2025 | Apr. 30, 2025 | Jan. 31, 2025 | Jul. 31, 2024 | Apr. 30, 2024 | Jan. 31, 2024 | Jul. 31, 2025 | Jul. 31, 2024
Components of accumulated other comprehensive income, net of taxes |  |  |  |  |  |  |  |
Balance at the beginning of period | $ (1,276) | $ (1,072) | $ (1,323) | $ (916) | $ (1,640) | $ (1,069) | $ (1,323) | $ (1,069)
Tax effects on change in unrealized components | (63) |  |  | 24 |  |  | 47 | 54
Other comprehensive income (loss), net of taxes | 202 | (639) | 230 | (83) | 126 | (235) | (207) | (192)
Balance at the end of period | (901) | (1,276) | (1,072) | (1,392) | (916) | (1,640) | (901) | (1,392)
Unrealized components of available-for-sale debt securities |  |  |  |  |  |  |  |
Components of accumulated other comprehensive income, net of taxes |  |  |  |  |  |  |  |
Balance at the beginning of period | 20 |  | 14 | 11 |  | 7 | 14 | 7
Unrealized gains (losses) arising during the period | 5 |  |  | 3 |  |  | 11 | 7
Tax effects on change in unrealized components of available-for-sale securities | (1) |  |  | (1) |  |  | (1) | (1)
Other comprehensive income (loss), net of taxes | 4 |  |  | 2 |  |  | 10 | 6
Balance at the end of period | 24 | 20 |  | 13 | 11 |  | 24 | 13
Unrealized components of cash flow hedges |  |  |  |  |  |  |  |
Components of accumulated other comprehensive income, net of taxes |  |  |  |  |  |  |  |
Balance at the beginning of period | (393) |  | 47 | 89 |  | 230 | 47 | 230
Unrealized gains (losses) arising during the period | 59 |  |  | (36) |  |  | (301) | (47)
Losses (gains) reclassified into earnings | 202 |  |  | (87) |  |  | 11 | (251)
Tax effects on change in unrealized components | (61) |  |  | 27 |  |  | 50 | 61
Other comprehensive income (loss), net of taxes | 200 |  |  | (96) |  |  | (240) | (237)
Balance at the end of period | (193) | (393) |  | (7) | 89 |  | (193) | (7)
Unrealized components of defined benefit plans |  |  |  |  |  |  |  |
Components of accumulated other comprehensive income, net of taxes |  |  |  |  |  |  |  |
Balance at the beginning of period | (488) |  | (496) | (423) |  | (437) | (496) | (437)
Unrealized gains (losses) arising during the period | (7) |  |  | 0 |  |  | (8) | 13
Tax effects on change in unrealized components | 0 |  |  | (2) |  |  | (1) | (6)
Other comprehensive income (loss), net of taxes | 0 |  |  | 0 |  |  | 8 | 14
Balance at the end of period | (488) | (488) |  | (423) | (423) |  | (488) | (423)
Amortization of actuarial loss and prior service benefit |  |  |  |  |  |  |  |
Components of accumulated other comprehensive income, net of taxes |  |  |  |  |  |  |  |
Losses (gains) reclassified into earnings | 5 |  |  | 1 |  |  | 15 | 5
Curtailments, settlements and other |  |  |  |  |  |  |  |
Components of accumulated other comprehensive income, net of taxes |  |  |  |  |  |  |  |
Losses (gains) reclassified into earnings | 2 |  |  | 1 |  |  | 2 | 2
Cumulative translation adjustment |  |  |  |  |  |  |  |
Components of accumulated other comprehensive income, net of taxes |  |  |  |  |  |  |  |
Balance at the beginning of period | 18 |  | 1 | (9) |  | (23) | 1 | (23)
Unrealized gains (losses) arising during the period | (1) |  |  | 11 |  |  | 16 | 25
Tax effects on change in unrealized components | (1) |  |  | 0 |  |  | (1) | 0
Other comprehensive income (loss), net of taxes | (2) |  |  | 11 |  |  | 15 | 25
Balance at the end of period | 16 | 18 |  | 2 | (9) |  | 16 | 2
Accumulated other comprehensive loss |  |  |  |  |  |  |  |
Components of accumulated other comprehensive income, net of taxes |  |  |  |  |  |  |  |
Balance at the beginning of period | (843) | (204) | (434) | (332) | (458) | (223) | (434) | (223)
Other comprehensive income (loss), net of taxes | 202 | (639) | 230 | (83) | 126 | (235) |  |
Balance at the end of period | $ (641) | $ (843) | $ (204) | $ (415) | $ (332) | $ (458) | $ (641) | $ (415)

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