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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, 2020
Oct. 31, 2019
Oct. 31, 2018
Shares      
Outstanding at beginning of year (in shares) 7,093 7,086 18,067
Granted and assumed through acquisition (in shares) 996 2,451 54
Exercised (in shares) (2,213) (2,429) (10,644)
Forfeited/cancelled/expired (in shares) (239) (15) (391)
Outstanding at end of year (in shares) 5,637 7,093 7,086
Vested and expected to vest (in shares) 5,637 7,093 7,084
Exercisable (in shares) 3,196 4,707 4,707
Weighted- Average Exercise Price      
Outstanding at beginning of period (in dollars per share) $ 16 $ 14 $ 13
Granted and assumed through acquisition (in dollars per share) 18 17 21
Exercised (in dollars per share) 14 13 13
Forfeited/cancelled/expired (in dollars per share) 19 10 16
Outstanding at end of period (in dollars per share) 17 16 14
Vested and expected to vest at end of period (in dollars per share) 17 16 14
Exercisable at end of period (in dollars per share) $ 15 $ 14 $ 14
Weighted- Average Remaining Contractual Term      
Outstanding at end of year 6 years 4 months 24 days 5 years 8 months 12 days 4 years 2 months 12 days
Vested and expected to vest 6 years 4 months 24 days 5 years 8 months 12 days 4 years 2 months 12 days
Exercisable 4 years 4 months 24 days 3 years 7 months 6 days 3 years 8 months 12 days
Aggregate Intrinsic Value      
Outstanding at end of year $ 10 $ 15 $ 73
Vested and expected to vest 10 15 73
Exercisable $ 9 $ 15 $ 49