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Stockholders' Equity (RSU Activity) (Details) - RSUs
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Jan. 31, 2021
USD ($)
$ / shares
shares
RSUs, Nonvested, Number of Shares [Roll Forward]  
Beginning balance 32.0
Granted 0.0 [1]
Vested (2.0)
Forfeited 0.0 [1]
Ending balance 30.0
RSUs, Weighted Average Grant Date Fair Value per Share  
Beginning balance, Weighted average grant date fair value per share | $ / shares $ 188.35
Granted, Weighted average grant date fair value per share | $ / shares 372.28
Vested, Weighted average grant date fair value per share | $ / shares 224.81
Forfeited, Weighted average grant date fair value per share | $ / shares 194.09
Ending balance, Weighted average grant date fair value per share | $ / shares $ 188.32
Threshold for reporting in the equity award activity table 1.0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value [Abstract]  
Aggregate market value of RSUs vested | $ $ 664
[1] Represents fewer than 1 million shares.