v3.26.1
Stockholders' Deficit - Schedule of Taxes Related to Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Apr. 30, 2026
Jan. 31, 2026
Apr. 30, 2025
Jan. 31, 2025
Apr. 30, 2026
Apr. 30, 2025
Components of accumulated other comprehensive income, net of taxes            
Balance at the beginning of period $ (766) $ (346) $ (1,072) $ (1,323) $ (346) $ (1,323)
Tax effects on change in unrealized components (47)   165   10 110
Other comprehensive income (loss), net of taxes 153 (197) (639) 230 (44) (409)
Balance at the end of period (144) (766) (1,276) (1,072) (144) (1,276)
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 18 14 29 14
Unrealized gains (losses) arising during the period 0   2   1 6
Other comprehensive income (loss), net of taxes 0   2   1 6
Balance at the end of period 30 30 20 18 30 20
Unrealized components of cash flow hedges            
Components of accumulated other comprehensive income, net of taxes            
Balance at the beginning of period (243) (48) 282 47 (48) 47
Unrealized gains (losses) arising during the period 106   (692)   (147) (360)
(Gains) losses reclassified into earnings 94   (148)   101 (191)
Tax effects on change in unrealized components (38)   165   13 111
Other comprehensive income (loss), net of taxes 162   (675)   (33) (440)
Balance at the end of period (81) (243) (393) 282 (81) (393)
Unrealized components of defined benefit plans            
Components of accumulated other comprehensive income, net of taxes            
Balance at the beginning of period (471) (450) (492) (496) (450) (496)
Unrealized gains (losses) arising during the period 0   (2)   (34) (1)
Tax effects on change in unrealized components (9)   0   (3) (1)
Other comprehensive income (loss), net of taxes (5)   4   (26) 8
Balance at the end of period (476) (471) (488) (492) (476) (488)
Amortization of actuarial loss and prior service benefit            
Components of accumulated other comprehensive income, net of taxes            
(Gains) losses reclassified into earnings 5   5   9 10
Curtailments, settlements and other            
Components of accumulated other comprehensive income, net of taxes            
(Gains) losses reclassified into earnings (1)   1   2 0
Cumulative translation adjustment            
Components of accumulated other comprehensive income, net of taxes            
Balance at the beginning of period 30 12 (12) 1 12 1
Unrealized gains (losses) arising during the period (4)   30   14 17
Other comprehensive income (loss), net of taxes (4)   30   14 17
Balance at the end of period 26 30 18 (12) 26 18
Accumulated other comprehensive loss            
Components of accumulated other comprehensive income, net of taxes            
Balance at the beginning of period (654) (457) (204) (434) (457) (434)
Other comprehensive income (loss), net of taxes 153 (197) (639) 230    
Balance at the end of period $ (501) $ (654) $ (843) $ (204) $ (501) $ (843)