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Stock-Based Compensation - Schedule of Stock Options Activity (Details)
$ / shares in Units, shares in Thousands, $ in Millions
9 Months Ended
Jul. 31, 2018
USD ($)
$ / shares
shares
Shares  
Outstanding at beginning of period (shares) | shares 18,067
Granted (shares) | shares 54
Exercised (shares) | shares (8,593)
Forfeited and expired (shares) | shares (278)
Outstanding at end of period (shares) | shares 9,250
Vested and expected to vest at end of period (shares) | shares 9,204
Exercisable at end of period (shares) | shares 6,555
Weighted- Average Exercise Price  
Outstanding at beginning of period (usd per share) | $ / shares $ 13
Granted (usd per share) | $ / shares 21
Exercised (usd per share) | $ / shares 12
Forfeited and expired (usd per share) | $ / shares 16
Outstanding at end of period (usd per share) | $ / shares 14
Vested and expected to vest at end of period (usd per share) | $ / shares 14
Exercisable at end of period (usd per share) | $ / shares $ 14
Weighted- Average Remaining Contractual Term  
Outstanding at end of period 4 years 2 months
Vested and expected to vest 4 years 2 months
Exercisable 3 years 8 months 1 day
Aggregate Intrinsic Value  
Outstanding at end of period | $ $ 86
Vested and expected to vest | $ 85
Exercisable | $ $ 61