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Net (Loss) Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Apr. 30, 2025
Jan. 31, 2025
Apr. 30, 2024
Apr. 30, 2025
Apr. 30, 2024
Numerator:          
Net (loss) earnings attributable to common stockholders - Basic $ (1,079)   $ 314 $ (481) $ 701
Plus: 7.625% Series C mandatory convertible preferred stock dividends $ 29   $ 0 $ 58 $ 0
Denominator:          
Weighted-average shares used to compute basic net EPS (in shares) 1,322   1,311 1,319 1,306
Dilutive effect of employee stock plans (in shares) 0   14 0 14
Dilutive effect of 7.625% Series C mandatory convertible preferred stock (in shares) [1] 0   0 0 0
Weighted-average shares used to compute diluted net EPS (in shares) 1,322   1,325 1,319 1,320
Net EPS:          
Basic (in dollars per share) $ (0.82)   $ 0.24 $ (0.36) $ 0.54
Diluted (in dollars per share) $ (0.82)   $ 0.24 $ (0.36) $ 0.53
Employee stock purchase plan (in shares) 49   0 51 0
Convertible preferred stock (in shares) 87   0 76 0
Anti-dilutive weighted average stock awards (in shares) [2] 136   0 127 0
Convertible Preferred Stock          
Net EPS:          
Preferred stock dividend rate (as a percentage) 7.625% 7.625%   7.625%  
[1] The effect of employee stock plans and preferred stock is excluded when calculating diluted net loss per share as it would be anti-dilutive.
[2] The Company excludes shares potentially issuable under employee stock plans that could dilute basic net EPS in the future from the calculation of diluted net EPS, as their effect, if included, would have been anti-dilutive for the periods presented.