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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)