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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, 2018
Oct. 31, 2017
Oct. 31, 2016
Shares      
Outstanding at beginning of year (in shares) 18,067 28,218 36,278
Granted and assumed through acquisition (in shares) 54 104 25,425
Exercised (in shares) (10,644) (9,407) (4,714)
Awards cancelled due to Separation (in dollars per share) 0 0 (26,252)
Forfeited/cancelled/expired (in shares) (391) (848) (2,519)
Outstanding at end of year (in shares) 7,086 18,067 28,218
Vested and expected to vest (in shares) 7,084 17,692 26,850
Exercisable (in shares) 4,707 10,898 15,418
Weighted- Average Exercise Price      
Outstanding at beginning of period (in dollars per share) $ 13 $ 12 $ 26
Granted and assumed through acquisition (in dollars per share) 21 19 6
Exercised (in dollars per share) 13 11 8
Awards cancelled due to Separation (in shares) 0 0 26
Forfeited/cancelled/expired (in dollars per share) 16 17 17
Outstanding at end of period (in dollars per share) 14 13 12
Vested and expected to vest at end of period (in dollars per share) 14 13 12
Exercisable at end of period (in dollars per share) $ 14 $ 12 $ 11
Weighted- Average Remaining Contractual Term      
Outstanding at end of year 4 years 2 months 12 days 4 years 2 months 12 days 5 years
Vested and expected to vest 4 years 2 months 12 days 4 years 1 month 6 days 4 years 10 months 24 days
Exercisable 3 years 8 months 12 days 3 years 1 month 6 days 3 years 8 months 12 days
Aggregate Intrinsic Value      
Outstanding at end of year $ 73 $ 152 $ 73
Vested and expected to vest 73 149 71
Exercisable $ 49 $ 102 $ 62