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Stockholders' Equity (Stock Option Activity) (Details) - Employee Stock Options
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Jan. 31, 2021
USD ($)
$ / shares
shares
Options Outstanding, Number of Shares [Roll Forward]  
Beginning balance 1.0
Exercised (1.0)
Ending balance 0.0 [1]
Fully vested 0.0 [1]
Fully vested and expected to vest 0.0 [1]
Options, Weighted-Average Exercise Price per Share  
Beginning balance, Weighted average exercise price per share | $ / shares $ 62.35
Exercised, Weighted average exercise price per share | $ / shares 58.32
Ending balance, Weighted average exercise price per share | $ / shares 69.63
Fully vested, Weighted average exercise price per share | $ / shares 69.86
Fully vested and expected to vest, Weighted average exercise price per share | $ / shares $ 69.63
Additional Option Disclosures  
Outstanding, Weighted average remaining contractual life (in years) 4 months 24 days
Fully vested, Weighted average remaining contractual life (in years) 3 months 18 days
Fully vested and expected to Vest, Weighted average remaining contractual life (in years) 4 months 24 days
Exercised, Aggregate intrinsic value | $ $ 211
Outstanding, Aggregate intrinsic value | $ 126
Fully vested, Aggregate intrinsic value | $ 124
Fully vested and expected to vest, Aggregate intrinsic value | $ $ 126
Threshold for reporting in the equity award activity table 1.0
[1] Represents fewer than 1 million shares.