v3.26.1
Stockholders' Deficit - Schedule of Taxes Related to Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jul. 31, 2026
Apr. 30, 2026
Jan. 31, 2026
Jul. 31, 2025
Apr. 30, 2025
Jan. 31, 2025
Jul. 31, 2026
Jul. 31, 2025
Components of accumulated other comprehensive income, net of taxes                
Balance at the beginning of period $ (144) $ (766) $ (346) $ (1,276) $ (1,072) $ (1,323) $ (346) $ (1,323)
Tax effects on change in unrealized components (32)     (63)     (22) 47
Other comprehensive income (loss), net of taxes 153 153 (197) 202 (639) 230 109 (207)
Balance at the end of period (92) (144) (766) (901) (1,276) (1,072) (92) (901)
Unrealized components of available-for-sale debt securities                
Components of accumulated other comprehensive income, net of taxes                
Balance at the beginning of period 30   29 20   14 29 14
Unrealized gains (losses) arising during the period 1     5     2 11
Tax effects on change in unrealized components 0     (1)     0 (1)
Other comprehensive income (loss), net of taxes 1     4     2 10
Balance at the end of period 31 30   24 20   31 24
Unrealized components of cash flow hedges                
Components of accumulated other comprehensive income, net of taxes                
Balance at the beginning of period (81)   (48) (393)   47 (48) 47
Unrealized gains (losses) arising during the period 141     59     (6) (301)
Losses reclassified into earnings 18     202     119 11
Tax effects on change in unrealized components (28)     (61)     (15) 50
Other comprehensive income (loss), net of taxes 131     200     98 (240)
Balance at the end of period 50 (81)   (193) (393)   50 (193)
Unrealized components of defined benefit plans                
Components of accumulated other comprehensive income, net of taxes                
Balance at the beginning of period (476)   (450) (488)   (496) (450) (496)
Unrealized gains (losses) arising during the period 20     (7)     (14) (8)
Tax effects on change in unrealized components (4)     0     (7) (1)
Other comprehensive income (loss), net of taxes 24     0     (2) 8
Balance at the end of period (452) (476)   (488) (488)   (452) (488)
Amortization of actuarial loss and prior service benefit                
Components of accumulated other comprehensive income, net of taxes                
Losses reclassified into earnings (5)     (5)     (14) (15)
Curtailments, settlements and other                
Components of accumulated other comprehensive income, net of taxes                
Losses reclassified into earnings 3     2     5 2
Cumulative translation adjustment                
Components of accumulated other comprehensive income, net of taxes                
Balance at the beginning of period 26   12 18   1 12 1
Unrealized gains (losses) arising during the period (3)     (1)     11 16
Tax effects on change in unrealized components 0     (1)     0 (1)
Other comprehensive income (loss), net of taxes (3)     (2)     11 15
Balance at the end of period 23 26   16 18   23 16
Accumulated other comprehensive loss                
Components of accumulated other comprehensive income, net of taxes                
Balance at the beginning of period (501) (654) (457) (843) (204) (434) (457) (434)
Other comprehensive income (loss), net of taxes 153 153 (197) 202 (639) 230    
Balance at the end of period $ (348) $ (501) $ (654) $ (641) $ (843) $ (204) $ (348) $ (641)