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Stock-Based Compensation - Summary of Stock Options Activity (Details) - Stock Options - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Oct. 31, 2021
Oct. 31, 2020
Oct. 31, 2019
Shares      
Outstanding at beginning of year (in shares) 5,637 7,093 7,086
Granted and assumed through acquisition (in shares) 2,691 996 2,451
Exercised (in shares) (1,843) (2,213) (2,429)
Forfeited/cancelled/expired (in shares) (118) (239) (15)
Outstanding at end of year (in shares) 6,367 5,637 7,093
Vested and expected to vest (in shares) 6,367 5,637 7,093
Exercisable (in shares) 2,392 3,196 4,707
Weighted- Average Exercise Price      
Outstanding at beginning of period (in dollars per share) $ 17 $ 16 $ 14
Granted and assumed through acquisition (in dollars per share) 24 18 17
Exercised (in dollars per share) 15 14 13
Forfeited/cancelled/expired (in dollars per share) 18 19 10
Outstanding at end of period (in dollars per share) 21 17 16
Vested and expected to vest at end of period (in dollars per share) 21 17 16
Exercisable at end of period (in dollars per share) $ 16 $ 15 $ 14
Weighted- Average Remaining Contractual Term      
Outstanding at end of year 7 years 4 months 24 days 6 years 4 months 24 days 5 years 8 months 12 days
Vested and expected to vest 7 years 4 months 24 days 6 years 4 months 24 days 5 years 8 months 12 days
Exercisable 5 years 3 months 18 days 4 years 4 months 24 days 3 years 7 months 6 days
Aggregate Intrinsic Value      
Outstanding at end of year $ 68 $ 10 $ 15
Vested and expected to vest 68 10 15
Exercisable $ 34 $ 9 $ 15